US4123774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color signal encoding methods and apparatus for video recording and playback
Assignee: BASF SE
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Filing: 1977-02-07
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Granted: 1978-10-31
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Expires: 1997-02-07
Abstract
Abstract Methods and apparatus for translating standard broadcast format color television signals to an encoding format for use in a transfer channel, and for retranslation of the signals to broadcast format. In one form of the invention, the broadcast format chroma signal is translated directly to transfer channel format without intermediate reduction to baseband. A second form of the invention achieves the same result by intermediate reduction to baseband of the chroma signal. The transfer channel format comprises chroma information amplitude modulated at a lower frequency than frequency modulated luma information, and enjoys exceptional independence from chroma cross-talk into luma in the restored broadcast signal as well as reduced cross-color distortion due to time base error in recording/playback transfer channels. An optional interlacing system provides even greater resistance to cross modulation effects. Audio information may be inserted without difficulty at frequency bands of the transfer channel not occupied by the encoded composite video signal.
Inventors
- 👤 Bernhard A. Hjortzberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:29
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/7921; H04N9/7925; H04N9/80; H04N9/82; H04N9/83; H04N9/835; H04N9/8355; H04N9/86; H04N9/87; H04N9/8707
Claims Analysis
Total Claims: 147
Claim 1
Independent Claim
183 words
A method of processing a color video signal in which quadrature modulated chroma information amplitude modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier, comprising the steps of: (a) separating a signal representing said amplitude and quadrature modulated chroma information from said color video signal; (b) applying said separated chroma information signal to one input of a first double balanced modulator; (c) switching the phase of a reference source of said first carrier frequency alternately between zero degrees and ninety degrees from one horizontal video scan line to the next; (d) mixing said phase switched first carrier reference with a reference source of said second carrier frequency to produce a signal comprising the sum and difference frequencies of said phase switched first carrier and said second carrier; and (e) applying said sum and difference frequency signal to a second input of said first double balanced modulator, whereby the output signal of said first double balanced modulator represents chroma information bisequentially amplitude modulated at said second carrier frequency with suppressed carrier.
Claim 2
Independent Claim
183 words
A method of processing a color video signal in which quadrature modulated chroma information amplitude modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier, comprising the steps of: (a) separating a signal representing said amplitude and quadrature modulated chroma information from said color video signal; (b) applying said separated chroma information signal to one input of a first double balanced modulator; (c) switching the phase of a reference source of said first carrier frequency alternately between zero degrees and ninety degrees from one horizontal video scan line to the next; (d) mixing said phase switched first carrier reference with a reference source of said second carrier frequency to produce a signal comprising the sum and difference frequencies of said phase switched first carrier and said second carrier; and (e) applying said sum and difference frequency signal to a second input of said first double balanced modulator, whereby the output signal of said first double balanced modulator represents chroma information bisequentially amplitude modulated at said second carrier frequency with suppressed carrier.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein the step of mixing said phase switched first carrier with said second carrier comprises double balanced modulation.
Claim 4
Dependent Claim
83 words
The method of claim 1 further comprising the step of inserting in the blanking interval of at least one horizontal video scan line of said amplitude modulated quadrature chroma information signal a burst of said first carrier frequency prior to supplying said amplitude modulated quadrature chroma information signal to said first double balanced modulator, whereby the output signal of said first double balanced modulator contains a corresponding burst of said second carrier frequency due to frequency translation of said first carrier frequency burst.
Claim 5
Dependent Claim
63 words
The method of claim 1, further comprising the steps of separating a luma information signal from said color video signal and frequency modulating said luma information signal at a third carrier frequency, said third carrier frequency being selected so that sidebands of the frequency modulated luma signal will not appreciably interfere with sidebands of said bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 6
Dependent Claim
27 words
The method of claim 4, further comprising the steps of additively combining said frequency modulated luma signal with said bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 7
Dependent Claim
18 words
The method of claim 4, wherein said third carrier frequency is substantially higher than said second carrier frequency.
Claim 8
Dependent Claim
23 words
The method of claim 1, wherein said second carrier frequency is an odd multiple of one half the horizontal video line scan frequency.
Claim 9
Dependent Claim
88 words
The method of claim 4, wherein said color video signal is accompanied by an audio information signal, further comprising the steps of supplying said audio information signal frequency modulated at a fourth carrier frequency; and additively combining said frequency modulated audio signal with said frequency modulated luma signal and said bisequential chroma signal amplitude modulated with suppressed carrier, said fourth carrier frequency being selected so that sidebands of the frequency modulated audio signal will not appreciably interfere with sidebands of the signals with which it is additively combined.
Claim 10
Dependent Claim
24 words
The method of claim 1, further comprising the step of submitting said bisequential chroma signal amplitude modulated with suppressed carrier to a transfer channel.
Claim 11
Dependent Claim
13 words
The method of claim 9, wherein said transfer channel comprises a recording medium.
Claim 12
Dependent Claim
29 words
The method of claim 1, further comprising the step of submitting said bisequential chroma signal amplitude modulated with suppressed carrier to a transfer channel subject to time base error.
Claim 13
Dependent Claim
104 words
The method of claim 1, wherein said color video signal includes a synchronizing pulse in at least some horizontal video scan lines, further comprising the steps of separating said synchronization pulses from said color video signal and synchronizing the phase switching of said first carrier frequency reference with said synchronizing pulses, whereby the first carrier frequency reference is at 0° when a blue (B-Y) line of chroma information is to appear at the output of said first double balanced modulator and at ninety degrees when a red (R-Y) line of chroma information is to appear at the output of said first double balanced modulator.
Claim 14
Dependent Claim
74 words
The method of claim 1, further comprising the step of alternating the polarity of said second carrier reference on adjacent pairs of horizontal video scan lines prior to mixing with said phase switched first carrier reference, whereby the output signal of said first double balanced modulator has carrier polarity alternating on adjacent pairs of horizontal video scan lines and the modulation sideband frequencies comprise odd multiples of one quarter the horizontal scan line frequency.
Claim 15
Dependent Claim
33 words
The method of claim 13, further comprising the steps of generating a marker signal indicative of the phase of said alternating polarity carrier and combining said marker signal with said bisequential chroma information.
Claim 16
Dependent Claim
18 words
The method of claim 1, wherein said color video signal is a National Television Systems Committee format signal.
Claim 17
Dependent Claim
17 words
The method of claim 1, wherein said color video signal is a Phase Alternating Lines format signal.
Claim 18
Independent Claim
218 words
A method of processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to quadrature modulated chroma information amplitude modulated at a first carrier frequency, comprising the steps of: (a) separating said bisequential chroma signal amplitude modulated with suppressed carrier from said color video signal; (b) applying said separated chroma information signal to one input of a multiplier; (c) switching the phase of a reference of said first carrier frequency between zero degrees and ninety degrees on adjacent horizontal video scan lines; (d) mixing said phase switched first carrier reference with a reference of said second carrier frequency to produce a signal comprising the sum and difference frequencies of said phase switched first carrier and said second carrier; (e) applying said sum and difference frequency signal to a second input of said multiplier, whereby the output signal of said multiplier represents bisequential chroma information amplitude modulated at said first carrier frequency with the carrier phase changing between zero and ninety degrees on adjacent horizontal video scan lines; (f) delaying by one horizontal video scan line the output of said multiplier; and (g) additively combining the undelayed signal from said multiplier with the line delayed signal, whereby a quadrature and amplitude modulated chroma information signal is produced.
Claim 19
Independent Claim
218 words
A method of processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to quadrature modulated chroma information amplitude modulated at a first carrier frequency, comprising the steps of: (a) separating said bisequential chroma signal amplitude modulated with suppressed carrier from said color video signal; (b) applying said separated chroma information signal to one input of a multiplier; (c) switching the phase of a reference of said first carrier frequency between zero degrees and ninety degrees on adjacent horizontal video scan lines; (d) mixing said phase switched first carrier reference with a reference of said second carrier frequency to produce a signal comprising the sum and difference frequencies of said phase switched first carrier and said second carrier; (e) applying said sum and difference frequency signal to a second input of said multiplier, whereby the output signal of said multiplier represents bisequential chroma information amplitude modulated at said first carrier frequency with the carrier phase changing between zero and ninety degrees on adjacent horizontal video scan lines; (f) delaying by one horizontal video scan line the output of said multiplier; and (g) additively combining the undelayed signal from said multiplier with the line delayed signal, whereby a quadrature and amplitude modulated chroma information signal is produced.
Claim 20
Dependent Claim
23 words
The method of claim 17, wherein the step of mixing said phase switched first carrier with said second carrier comprises double balanced modulation.
Claim 21
Dependent Claim
33 words
The method of claim 17, further including the step of inserting a burst of said first carrier frequency during the blanking interval of alternate horizontal video scan lines of said multiplier output signal.
Claim 22
Dependent Claim
50 words
The method of claim 19, wherein the step of inserting said burst comprises the steps of first producing said burst by gating a reference source of said first carrier frequency synchronously with blanking intervals of said multiplier output signal, and then additively combining said burst with said multiplier output signal.
Claim 23
Dependent Claim
63 words
The method of claim 19 wherein the step of inserting said burst comprises the steps of unbalancing a second double balanced modulator to pass said multiplier output signal in the interim between blanking intervals of horizontal video scan lines and further unbalancing said second double balanced modulator to pass said first carrier frequency during the blanking intervals of alternate horizontal video scan lines.
Claim 24
Dependent Claim
68 words
The method of claim 17, further including the step of inserting a burst of said first carrier frequency during the blanking interval of each horizontal video scan line of said multiplier outpout signal, the phase angle of said burst being 90° when inserted in a red (R-Y) horizontal video line and being 180° when inserted in a blue (B-Y) horizontal video scan line of said multiplier output signal.
Claim 25
Dependent Claim
52 words
The method of claim 22, wherein the step of inserting said burst comprises the steps of first producing a burst signal by gating a phase-switched source of said first carrier frequency synchronously with blanking intervals of said multiplier output signal and then additively combining said burst signal with said multiplier output signal.
Claim 26
Dependent Claim
71 words
The method of claim 22, wherein the step of inserting said burst comprises the steps of unbalancing a second double balanced modulator to pass said multiplier output signal in the interim between blanking intervals of horizontal video scan lines and further unbalancing said second double balanced modulator to pass said first carrier frequency with alternating phase angles of 90° and 180° during the blanking intervals of alternate horizontal video scan lines.
Claim 27
Dependent Claim
58 words
The method of claim 17 wherein said color video signal is subject to time base error and has a burst of said second carrier frequency in at least some horizontal blanking intervals, further comprising the steps of separating said second carrier frequency bursts from said color video signal and providing said bursts to a time base error corrector.
Claim 28
Dependent Claim
56 words
The method of claim 17 wherein in the step of additively combining the undelayed signal from said multiplier and the line delayed signal from said multiplier are 90° out of phase for all horizontal video scan lines, whereby the resulting quadrature and amplitude modulated chroma information signal comprises chroma information in National Television Systems Committee format.
Claim 29
Dependent Claim
53 words
The method of claim 17, wherein in the step of additively combining, the line delayed signal is alternated in polarity on adjacent horizontal video scan lines and the undelayed signal is at constant phase angle, whereby the resulting quadrature and amplitude modulated chroma information signal comprises chroma information in Phase Alternating Lines format.
Claim 30
Dependent Claim
115 words
The method of claim 17, wherein said bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier has its carrier polarity alternated every two horizontal video scan lines and said video signal has a marker signal indicating the phase of such polarity alternation, further comprising the step of alternating the polarity of the second carrier frequency reference supplied to said multiplier synchronously with said marker signal, whereby the output signal of said multiplier comprises bisequential chroma information amplitude modulated at said first carrier frequency with the carrier phase angle changing between 0° and 90° on adjacent horizontal video scan lines, but with the effect of said second carrier polarity alternation being cancelled.
Claim 31
Dependent Claim
57 words
The method of claim 17, wherein said color video signal includes luma information frequency modulated at a third carrier frequency, further comprising the steps of separating the modulated luma information from said color video signal, frequency demodulating said luma information, and additively combining the demodulated luma information signal with said quadrature and amplitude modulated chroma information signal.
Claim 32
Dependent Claim
18 words
The method of claim 29 wherein said third carrier frequency is substantially higher than said second carrier frequency.
Claim 33
Dependent Claim
34 words
The method of claim 29 wherein said color video signal includes audio information frequency modulated at a fourth carrier frequency; further including the step of separating said audio information from said color video signal.
Claim 34
Dependent Claim
154 words
An arrangement for processing a color video signal in which quadrature modulated chroma information amplitude modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated with suppressed carrier, comprising: (a) means for separating from said color video signal a signal representing said amplitude and quadrature modulated chroma information; (b) means for producing a reference signal at said first carrier frequency switched in phase between 0° and 90° on adjacent horizontal video scan lines; (c) means for producing a reference signal at said second carrier frequency; (d) means coupled for mixing said phase-switched first carrier frequency signal and said second carrier frequency signal to produce a signal comprising a sum and difference frequency signal; and (e) means coupled for double balanced modulating said sum and difference signal with said quadrature and amplitude modulated chroma information signal, whereby an output signal representing bisequential chroma information amplitude modulated with suppressed carrier is produced.
Claim 35
Dependent Claim
154 words
An arrangement for processing a color video signal in which quadrature modulated chroma information amplitude modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated with suppressed carrier, comprising: (a) means for separating from said color video signal a signal representing said amplitude and quadrature modulated chroma information; (b) means for producing a reference signal at said first carrier frequency switched in phase between 0° and 90° on adjacent horizontal video scan lines; (c) means for producing a reference signal at said second carrier frequency; (d) means coupled for mixing said phase-switched first carrier frequency signal and said second carrier frequency signal to produce a signal comprising a sum and difference frequency signal; and (e) means coupled for double balanced modulating said sum and difference signal with said quadrature and amplitude modulated chroma information signal, whereby an output signal representing bisequential chroma information amplitude modulated with suppressed carrier is produced.
Claim 36
Dependent Claim
12 words
The arrangement of claim 31 wherein said separating means comprises a filter.
Claim 37
Dependent Claim
14 words
The arrangement of claim 31, wherein said mixing means comprises a double balanced modulator.
Claim 38
Dependent Claim
68 words
The arrangement of claim 31 further comprising means coupled for inserting in the blanking interval of at least one horizontal video scan line of said quadrature and amplitude modulated chroma information signal a burst of said first carrier frequency prior to said double balanced modulating means, whereby said output signal contains a burst of said second carrier frequency due to frequency translation of said first carrier frequency burst.
Claim 39
Dependent Claim
66 words
The arrangement of claim 32, further comprising means coupled for separating a luma information signal from said color video signal and means coupled for frequency modulating said luma information signal at a third carrier frequency, said third carrier frequency being selected so that sidebands of the frequency modulated luma signal will not appreciably interfere with sidebands of said bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 40
Dependent Claim
27 words
The arrangement of claim 36, further comprising means coupled for additively combining said frequency modulated luma signal with said bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 41
Dependent Claim
91 words
The arrangement of claim 36, wherein said color video signal is accompanied by an audio information signal, further comprising means coupled for supplying said audio information signal frequency modulated at a fourth carrier frequency and means for additively combining said frequency modulated audio signal with said frequency modulated luma signal and said bisequential chroma signal amplitude modulated with suppressed carrier said fourth carrier frequency being selected so that sidebands of said frequency modulated audio signal will not appreciably interfere with sidebands of the luma and chroma signals with which additively combined.
Claim 42
Dependent Claim
18 words
The arrangement of claim 36, wherein said third carrier frequency is substantially higher than said second carrier frequency.
Claim 43
Dependent Claim
23 words
The arrangement of claim 32, wherein said second carrier frequency is an odd multiple of one half the horizontal video line scan frequency.
Claim 44
Dependent Claim
23 words
The arrangement of claim 32, further comprising means for submitting said bisequential chroma signal amplitude modulated with suppressed carrier to a transfer channel.
Claim 45
Dependent Claim
13 words
The arrangement of claim 41, wherein said transfer channel comprises a recording medium.
Claim 46
Dependent Claim
15 words
The arrangement of claim 41, wherein said transfer channel is subject to time base error.
Claim 47
Dependent Claim
95 words
The arrangement of claim 32, wherein said color video signal includes a synchronization pulse in at least some horizontal video scan lines, further comprising means for synchronizing the phase of said switched first carrier frequency signal with said synchronizing pulses, whereby said switched first carrier frequency signal is at 0° phase angle when a blue (B-Y) line of chroma information is to appear at the output of said double balanced modulating means and at 90° when a red (R-Y) line of chroma information is to appear at the output of said double balanced modulating means.
Claim 48
Dependent Claim
78 words
The arrangement of claim 32, further including means coupled for alternating the polarity of said second carrier reference on adjacent pairs of horizontal video scan lines prior to said mixing means, whereby said output signal comprising bisequential chroma information amplitude modulated at said second carrier frequency with suppressed carrier has the carrier polarity alternating on adjacent pairs of horizontal video scan lines and has modulation sideband frequencies comprising odd multiples of one quarter the horizontal scan line frequency.
Claim 49
Dependent Claim
37 words
The arrangement of claim 45, further comprising means for producing a marker signal indicative of the phase of said alternating polarity second carrier and means coupled for combining said marker signal with said bisequential chroma information signal.
Claim 50
Dependent Claim
223 words
An arrangement for processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to quadrature modulated chroma information amplitude modulated at a first carrier frequency, comprising: (a) means coupled for separating said bisequential chroma signal from said color video signal; (b) means coupled for producing a reference signal at said first carrier frequency phase switched between zero degrees and ninety degrees on adjacent horizontal video scan lines; (c) means coupled for producing a reference signal at said second carrier frequency; (d) means coupled for mixing said phase switched first carrier frequency signal and said second carrier frequency signal to produce a sum and difference frequency signal; (e) means coupled for multiplying said bisequential chroma signal amplitude modulated at said second carrier frequency with suppressed carrier by said sum and difference frequency signal to produce an output signal representing bisequential chroma information amplitude modulated at said first carrier frequency with the carrier phase angle changing between zero degrees and ninety degrees on adjacent horizontal video scan lines; (f) means for delaying by one horizontal video scan line the output of said multiplying means; and (g) means for additively combining the undelayed signal from said multiplying means with the line delayed signal, whereby a quadrature and amplitude modulated chroma information signal is produced.
Claim 51
Dependent Claim
223 words
An arrangement for processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to quadrature modulated chroma information amplitude modulated at a first carrier frequency, comprising: (a) means coupled for separating said bisequential chroma signal from said color video signal; (b) means coupled for producing a reference signal at said first carrier frequency phase switched between zero degrees and ninety degrees on adjacent horizontal video scan lines; (c) means coupled for producing a reference signal at said second carrier frequency; (d) means coupled for mixing said phase switched first carrier frequency signal and said second carrier frequency signal to produce a sum and difference frequency signal; (e) means coupled for multiplying said bisequential chroma signal amplitude modulated at said second carrier frequency with suppressed carrier by said sum and difference frequency signal to produce an output signal representing bisequential chroma information amplitude modulated at said first carrier frequency with the carrier phase angle changing between zero degrees and ninety degrees on adjacent horizontal video scan lines; (f) means for delaying by one horizontal video scan line the output of said multiplying means; and (g) means for additively combining the undelayed signal from said multiplying means with the line delayed signal, whereby a quadrature and amplitude modulated chroma information signal is produced.
Claim 52
Dependent Claim
32 words
The arrangement of claim 47, further comprising means for inserting a burst of said first carrier frequency during the blanking interval of alternate horizontal video scan lines of said multiplier output signal.
Claim 53
Dependent Claim
48 words
The arrangement of claim 48, wherein said burst inserting means comprises neans for generating said burst by gating a reference source of said first carrier frequency synchronously with blanking intervals of said multiplier output signal, and means for additively combining said burst with said multiplying means output signal.
Claim 54
Dependent Claim
71 words
The arrangement of claim 48, wherein said burst inserting means comprises a second double balanced modulator and means coupled for unbalancing said second double balanced modulator, said second double balanced modulator coupled to said unbalancing means for passing said multiplier output signal in the interim between the blanking intervals of horizontal video scan lines and for passing said first carrier frequency during the blanking intervals of alternate horizontal video scan lines.
Claim 55
Dependent Claim
70 words
The arrangement of claim 47, further including means for inserting a burst of said first carrier frequency during the blanking interval of each horizontal video scan line of said multiplying means output signal, the phase angle of said burst being 90° when inserted in a red (R-Y) horizontal video scan line and being 180° when inserted in a blue (B-Y) horizontal video scan line of said multiplying means output signal.
Claim 56
Dependent Claim
79 words
The arrangement of claim 51, wherein said burst inserting means comprises a second double balanced modulator and means coupled for unbalancing said second double balanced modulator, said second double balanced modulator coupled to said unbalancing means for passing said multiplier output signal in the interim between the blanking intervals of horizontal video scan lines and for passing said first carrier frequency with alternating phase angles of 90° and 180° during the blanking intervals of alternate horizontal video scan lines.
Claim 57
Dependent Claim
57 words
The arrangement of claim 47, wherein said color video signal is subject to time base error and has a burst of said second carrier frequency in at least some horizontal blanking intervals, further comprising means for separating said second carrier frequency bursts from said color video signal and providing said bursts to a time base error corrector.
Claim 58
Dependent Claim
42 words
The arrangement of claim 47, wherein said delaying means provides the line delayed signal 90° out of phase with the undelayed signal to said combining means, whereby the signal from said combining means comprises chroma information in National Television Systems Committee format.
Claim 59
Dependent Claim
49 words
The arrangement of claim 47, wherein said delaying means provides the line delayed signal with alternate polarity on adjacent horizontal video scan lines and said combining means receives the undelayed signal with constant polarity, whereby the signal from said combining means comprises chroma information in Phase Alternating Lines format.
Claim 60
Dependent Claim
117 words
The arrangement of claim 47, wherein said bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier has a carrier which is polarity alternated on adjacent pairs of horizontal video scan lines and said video signal has a marker signal indicating the phase of such carrier polarity alternation, further comprising means for alternating the polarity of said second carrier reference signal synchronously with said marker signal, whereby the output of said multiplying means comprises bisequential chroma information amplitude modulated at said first carrier frequency with the carrier phase angle changing between zero degrees and ninety degrees on adjacent horizontal video scan lines, but with the effect of said second carrier polarity alternation being cancelled.
Claim 61
Dependent Claim
60 words
The arrangement of claim 47, wherein said color video signal includes luma information frequency modulated at a third carrier frequency, further comprising means for separating the modulated luma information from said color video signal; means for frequency demodulating said luma information; and means for additively combining the demodulated luma information signal with said quadrature and amplitude modulated chroma information signal.
Claim 62
Dependent Claim
18 words
The arrangement of claim 57 wherein said third carrier frequency is substantially higher than said second carrier frequency.
Claim 63
Dependent Claim
33 words
The arrangement of claim 57 wherein said color video signal includes audio information frequency modulated at a fourth carrier frequency, further comprising means for separating said audio information from said color video signal.
Claim 64
Independent Claim
229 words
A method of processing a color video signal in which quadrature modulated chroma information amplitude modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier, comprising the steps of: (a) separating a signal representing said amplitude and quadrature modulated chroma information from said color video signal; (b) switching the phase angle of a reference source of said first carrier frequency alternately between 0° and 90° on adjacent horizontal video scan lines; (c) double balanced modulating said amplitude and quadrature modulated chroma signal with the phase switched first carrier frequency to produce an unmodulated bisequential chroma signal; (d) double balanced modulating said unmodulated bisequential chroma signal with a reference source of said second carrier frequency to produce a bisequential chroma signal amplitude modulated with suppressed carrier at said second carrier frequency; (e) separating a signal representing luma information from said color video signal; (f) frequency modulating said luma signal at a third carrier frequency, said third carrier frequency being substantially lower than said second carrier frequency and being selected so that sidebands of the bisequential chroma signal amplitude modulated with suppressed carrier will not appreciably interfere with sidebands of the frequency modulated luma signal; and (g) additively combining the bisequential chroma signal amplitude modulated with suppressed carrier and the frequency modulated luma signal to produce an output signal:
Claim 65
Independent Claim
229 words
A method of processing a color video signal in which quadrature modulated chroma information amplitude modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier, comprising the steps of: (a) separating a signal representing said amplitude and quadrature modulated chroma information from said color video signal; (b) switching the phase angle of a reference source of said first carrier frequency alternately between 0° and 90° on adjacent horizontal video scan lines; (c) double balanced modulating said amplitude and quadrature modulated chroma signal with the phase switched first carrier frequency to produce an unmodulated bisequential chroma signal; (d) double balanced modulating said unmodulated bisequential chroma signal with a reference source of said second carrier frequency to produce a bisequential chroma signal amplitude modulated with suppressed carrier at said second carrier frequency; (e) separating a signal representing luma information from said color video signal; (f) frequency modulating said luma signal at a third carrier frequency, said third carrier frequency being substantially lower than said second carrier frequency and being selected so that sidebands of the bisequential chroma signal amplitude modulated with suppressed carrier will not appreciably interfere with sidebands of the frequency modulated luma signal; and (g) additively combining the bisequential chroma signal amplitude modulated with suppressed carrier and the frequency modulated luma signal to produce an output signal:
Claim 66
Dependent Claim
41 words
The method of claim 60, wherein the double balanced modulation with said second carrier frequency is periodically unbalanced to produce a burst of said second carrier frequency in horizontal blanking intervals of the bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 67
Dependent Claim
57 words
The method of claim 60, wherein said color video signal is accompanied by an audio information signal, further comprising the steps of providing said audio signal frequency modulated at a fourth carrier frequency, and additively combining the frequency modulated audio signal with the frequency modulated luma signal and the bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 68
Dependent Claim
15 words
The method of claim 60, further comprising submitting said output signal to a transfer channel.
Claim 69
Dependent Claim
13 words
The method of claim 63 wherein said transfer channel is a recording medium.
Claim 70
Dependent Claim
15 words
The method of claim 63 wherein said transfer channel is subject to time base error.
Claim 71
Dependent Claim
70 words
The method of claim 60, further comprising the step of polarity switching said second carrier frequency reference signal on adjacent pairs of horizontal video scan lines, whereby said output signal comprises bisequential chroma information amplitude modulated with suppressed carrier, the modulated carrier being at opposite polarity on adjacent pairs of horizontal video scan lines and the modulation sideband frequencies comprising odd multiples of one quarter the horizontal scan line frequency.
Claim 72
Dependent Claim
32 words
The method of claim 66, further comprising the steps of generating a marker signal indicative of the phase of said alternating polarity carrier and combining said marker signal with said output signal.
Claim 73
Dependent Claim
22 words
The method of claim 60 wherein said second carrier frequency is an odd multiple of one half the video scan line frequency.
Claim 74
Independent Claim
218 words
A method of processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to quadrature modulated chroma information amplitude modulated at a first carrier frequency, comprising the steps of: (a) separating a representing bisequential chroma information amplitude modulated with suppressed carrier from said color video signal; (b) double balanced modulating said bisequential chroma signal amplitude modulated with suppressed carrier, with a reference source of said second carrier frequency to produce an unmodulated bisequential chroma signal; (c) switching the phase angle of a reference source of said first carrier frequency alternately between 0° and 90° on adjacent horizontal video scan lines; (d) double balanced modulating said unmodulated bisequential chroma signal with the phase switched first carrier frequency to produce a bisequential amplitude and quadrature modulated chroma signal; (e) delaying by one horizontal video scan line the said bisequential amplitude and quadrature modulated chroma signal; (f) additively combining the undelayed and the delayed bisequential amplitude and quadrature modulated chroma signal to produce a simultaneous quadrature and amplitude modulated chroma signal; (g) separating a signal representing frequency modulated luma information from said color video signal; (h) frequency demodulating said separated luma signal; and (i) additively combining the unmodulated luma signal and said simultaneous quadrature and amplitude modulated chroma signal.
Claim 75
Independent Claim
218 words
A method of processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to quadrature modulated chroma information amplitude modulated at a first carrier frequency, comprising the steps of: (a) separating a representing bisequential chroma information amplitude modulated with suppressed carrier from said color video signal; (b) double balanced modulating said bisequential chroma signal amplitude modulated with suppressed carrier, with a reference source of said second carrier frequency to produce an unmodulated bisequential chroma signal; (c) switching the phase angle of a reference source of said first carrier frequency alternately between 0° and 90° on adjacent horizontal video scan lines; (d) double balanced modulating said unmodulated bisequential chroma signal with the phase switched first carrier frequency to produce a bisequential amplitude and quadrature modulated chroma signal; (e) delaying by one horizontal video scan line the said bisequential amplitude and quadrature modulated chroma signal; (f) additively combining the undelayed and the delayed bisequential amplitude and quadrature modulated chroma signal to produce a simultaneous quadrature and amplitude modulated chroma signal; (g) separating a signal representing frequency modulated luma information from said color video signal; (h) frequency demodulating said separated luma signal; and (i) additively combining the unmodulated luma signal and said simultaneous quadrature and amplitude modulated chroma signal.
Claim 76
Dependent Claim
37 words
The method of claim 69, further including the step of inserting a burst of said first carrier frequency during the blanking interval of alternate horizontal video scan lines of said bisequential amplitude and quadrature modulated chroma signal.
Claim 77
Dependent Claim
58 words
The method of claim 70, wherein the step of inserting said burst comprises the steps of first producing said burst by gating a reference source of said first carrier frequency synchronously with blanking intervals of said bisequential amplitude and quadrature modulated chroma signal and then additively combining said burst with said simultaneous amplitude and quadrature modulated chroma signal.
Claim 78
Dependent Claim
61 words
The method of claim 70, wherein the step of inserting said burst comprises unbalancing the double balanced modulation of said unmodulated bisequential chroma signal to pass said bisequential amplitude and quadrature modulated signal in the interim between blanking intervals of horizontal video scan lines and to pass said first carrier frequency during the blanking intervals of alternate horizontal video scan lines.
Claim 79
Dependent Claim
77 words
The method of claim 69, further including the step of inserting a burst of said first carrier frequency during the blanking interval of each horizontal video scan line of said bisequential amplitude and quadrature modulated chroma signal, the phase angle of said burst being 90° when inserted in a red (R-Y) horizontal video scan line and being 180° when inserted in a blue (B-Y) horizontal video scan line of said bisequential amplitude and quadrature modulated chroma signal.
Claim 80
Dependent Claim
60 words
The method of claim 73, wherein the step of inserting said burst comprises the steps of first producing a burst signal by gating a phase-switched source of said first carrier frequency synchronously with blanking intervals of said bisequential amplitude and quadrature modulated chroma signal and then additively combining said burst signal with said bisequential amplitude and quadrature modulated chroma signal.
Claim 81
Dependent Claim
73 words
The method of claim 73, wherein the step of inserting said burst comprises the steps of unbalancing the double balanced modulation of said unmodulated bisequential chroma signal to pass said bisequential amplitude and quadrature modulated chroma signal in the interim between blanking intervals of horizontal video scan lines and to pass said first carrier frequency with alternating phase angle of 90° and 180° during the blanking intervals of adjacent horizontal video scan lines.
Claim 82
Dependent Claim
58 words
The method of claim 69 wherein said color video signal is subject to time base error and has a burst of said second carrier frequency in at least some horizontal blanking intervals, further comprising the steps of separating said second carrier frequency bursts from said color video signal and providing said bursts to a time base error corrector.
Claim 83
Dependent Claim
54 words
The method of claim 69 wherein in the step of additively combining the delayed and undelayed bisequential amplitude and quadrature modulated chroma signals are 90° out of phase for all horizontal video scan lines, whereby the resulting simultaneous quadrature and amplitude modulated chroma information signal comprises chroma information in National Television Systems Committee format.
Claim 84
Dependent Claim
54 words
The method of claim 69 wherein in the step of additively combining, the line delayed signal is alternated in polarity on adjacent horizontal video scan lines and the undelayed signal is at constant phase angle, whereby the resulting simultaneous quadrature and amplitude modulated chroma information signal comprises chroma information in Phase Alternating Lines format.
Claim 85
Dependent Claim
76 words
The method of claim 69 wherein said bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier has its carrier polarity alternated on adjacent pairs of horizontal video scan lines and said color video signal has a marker signal indicating the phase of such polarity alteration, further comprising the step of alternating the polarity of said second carrier frequency reference synchronously with said marker signal, whereby said unmodulated bisequential chroma signal is produced.
Claim 86
Dependent Claim
246 words
An arrangement for processing a color video signal in which quadrature modulated chroma information amplitude modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier, comprising: (a) means coupled for separating a signal representing said amplitude and quadrature modulated chroma information from said color video signal; (b) means coupled for switching the phase angle of a reference source of said first carrier frequency between 0° and 90° on adjacent horizontal video scan lines; (c) means coupled for double balanced modulating said amplitude and quadrature modulated chroma signal with the phase switched first carrier frequency to produce an unmodulated bisequential chroma signal; (d) means coupled for double balanced modulating said unmodulated bisequential chroma signal with a reference source of said second carrier frequency to produce a bisequential chroma signal amplitude modulated with suppressed carrier at said second carrier frequency; (e) means coupled for separating a signal representing luma information from said color video signal; (f) means coupled for frequency modulating said luma signal at a third carrier frequency, said third carrier frequency being substantially lower than said second carrier frequency and being selected so that sidebands of the bisequential chroma signal amplitude modulated with suppressed carrier will not appreciably interfere with sidebands of the frequency modulated luma signal; and (g) means coupled for additively combining the bisequential chroma signal amplitude modulated with suppressed carrier and the frequency modulated luma signal to produce an output signal.
Claim 87
Dependent Claim
246 words
An arrangement for processing a color video signal in which quadrature modulated chroma information amplitude modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier, comprising: (a) means coupled for separating a signal representing said amplitude and quadrature modulated chroma information from said color video signal; (b) means coupled for switching the phase angle of a reference source of said first carrier frequency between 0° and 90° on adjacent horizontal video scan lines; (c) means coupled for double balanced modulating said amplitude and quadrature modulated chroma signal with the phase switched first carrier frequency to produce an unmodulated bisequential chroma signal; (d) means coupled for double balanced modulating said unmodulated bisequential chroma signal with a reference source of said second carrier frequency to produce a bisequential chroma signal amplitude modulated with suppressed carrier at said second carrier frequency; (e) means coupled for separating a signal representing luma information from said color video signal; (f) means coupled for frequency modulating said luma signal at a third carrier frequency, said third carrier frequency being substantially lower than said second carrier frequency and being selected so that sidebands of the bisequential chroma signal amplitude modulated with suppressed carrier will not appreciably interfere with sidebands of the frequency modulated luma signal; and (g) means coupled for additively combining the bisequential chroma signal amplitude modulated with suppressed carrier and the frequency modulated luma signal to produce an output signal.
Claim 88
Dependent Claim
43 words
The arrangement of claim 80 further including means for periodically unbalancing said double balanced modulation with said second carrier frequency, thereby producing a burst of said second carrier frequency in horizontal blanking intervals of the bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 89
Dependent Claim
60 words
The arrangement of claim 80 wherein said color video signal is accompanied by an audio information signal, further comprising means coupled for providing said audio signal frequency modulated at a fourth carrier frequency, and means coupled for additively combining the frequency modulated audio signal with the frequency modulated luma signal and the bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 90
Dependent Claim
17 words
The arangement of claim 80, further comprising means for submitting said output signal to a transfer channel.
Claim 91
Dependent Claim
13 words
The arrangement of claim 83 wherein said transfer channel comprises a recording medium.
Claim 92
Dependent Claim
15 words
The arrangement of claim 83 wherein said transfer channel is subject to time base error.
Claim 93
Dependent Claim
70 words
The arrangement of claim 80, further comprising means coupled for polarity switching said second carrier frequency reference signal on adjacent pairs of horizontal video scan lines, whereby said output signal comprises bisequential chroma information amplitude modulated with suppressed carrier, the modulated carrier being of opposite polarity on adjacent pairs of horizontal video scan lines and the modulation sideband frequencies comprising odd multiples of one quarter the horizontal scan line frequency.
Claim 94
Dependent Claim
34 words
The arrangement of claim 86 further comprising means for generating a marker signal indicative of the phase of said alternating polarity carrier, and means coupled for combining said marker signal with said output signal.
Claim 95
Dependent Claim
22 words
The arrangement of claim 80 wherein said second carrier frequency is an odd multiple of one half the video scan line frequency.
Claim 96
Dependent Claim
242 words
An arrangement for processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to quadrature modulated chroma information amplitude modulated at a first carrier frequency, comprising: (a) means coupled for separating a signal representing bisequential chroma information amplitude modulated with suppressed carrier from said color video signal; (b) means coupled for double balanced modulating said bisequential chroma signal amplitude modulated with suppressed carrier, with a reference source of said second carrier frequency, to produce an unmodulated bisequential chroma signal; (c) means coupled for switching the phase angle of a reference source of said first carrier frequency alternately between zero and ninety degrees on adjacent horizontal video scan lines; (d) means coupled for double balanced modulating said unmodulated bisequential chroma signal with the phase switched first carrier frequency to produce a bisequential amplitude and quadrature modulated chroma signal; (e) means coupled for delaying by one horizontal video scan line said bisequential amplitude and quadrature modulated chroma signal; (f) means coupled for additively combining the undelayed and the delayed bisequential amplitude and quadrature modulated chroma signal to produce a simultaneous quadrature and amplitude modulated chroma signal; (g) means coupled for separating a signal representing frequency modulated luma information from said color video signal; (h) means coupled for frequency demodulating said separated luma signal; and (i) means coupled for additively combining said unmodulated luma signal and said quadrature and amplitude modulated chroma signal.
Claim 97
Dependent Claim
242 words
An arrangement for processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to quadrature modulated chroma information amplitude modulated at a first carrier frequency, comprising: (a) means coupled for separating a signal representing bisequential chroma information amplitude modulated with suppressed carrier from said color video signal; (b) means coupled for double balanced modulating said bisequential chroma signal amplitude modulated with suppressed carrier, with a reference source of said second carrier frequency, to produce an unmodulated bisequential chroma signal; (c) means coupled for switching the phase angle of a reference source of said first carrier frequency alternately between zero and ninety degrees on adjacent horizontal video scan lines; (d) means coupled for double balanced modulating said unmodulated bisequential chroma signal with the phase switched first carrier frequency to produce a bisequential amplitude and quadrature modulated chroma signal; (e) means coupled for delaying by one horizontal video scan line said bisequential amplitude and quadrature modulated chroma signal; (f) means coupled for additively combining the undelayed and the delayed bisequential amplitude and quadrature modulated chroma signal to produce a simultaneous quadrature and amplitude modulated chroma signal; (g) means coupled for separating a signal representing frequency modulated luma information from said color video signal; (h) means coupled for frequency demodulating said separated luma signal; and (i) means coupled for additively combining said unmodulated luma signal and said quadrature and amplitude modulated chroma signal.
Claim 98
Dependent Claim
37 words
The arrangement of claim 89, further including means coupled for inserting a burst of said first carrier frequency during the blanking interval of alternate horizontal video scan lines of said bisequential amplitude and quadrature modulated chroma signal.
Claim 99
Dependent Claim
57 words
The arrangement of claim 90, wherein said burst inserting means comprise means coupled for first producing said burst by gating a reference source of said first carrier frequency synchronously with blanking intervals of said bisequential amplitude and quadrature modulated chroma signal and means coupled for additively combining said burst with said amplitude and quadrature modulated chroma signal.
Claim 100
Dependent Claim
64 words
The arrangement of claim 90 wherein said burst inserting means comprises means coupled for unbalancing said means for double balanced modulation of said unmodulated bisequential chroma signal, to pass said bisequential amplitude and quadrature modulated signal in the interim between blanking intervals of horizontal video scan lines and to pass said first carrier frequency during the blanking intervals of alternate horizontal video scan lines.
Claim 101
Dependent Claim
77 words
The arrangement of claim 89 further including means coupled for inserting a burst of said first carrier frequency during the blanking interval of each horizontal video scan line of said bisequential amplitude and quadrature modulated chroma signal, the phase angle of said burst being 90° when inserted in a red (R-Y) horizontal video scan line and being 180° when inserted in a blue (B-Y) horizontal video scan line of said bisequential amplitude and quadrature modulated chroma signal.
Claim 102
Dependent Claim
61 words
The arrangement of claim 93 wherein said burst inserting means comprises means coupled for first producing a burst signal by gating a phase-switched source of said first carrier frequency synchronously with blanking intervals of said bisequential amplitude and quadrature modulated chroma signal and means coupled for then additively combining said burst signal with said bisequential amplitude and quadrature modulated chroma signal.
Claim 103
Dependent Claim
73 words
The arrangement of claim 93 wherein said burst inserting means comprises means coupled for unbalancing said means for double balanced modulation of said unmodulated bisequential chroma signal, to pass said bisequential amplitude and quadrature modulated chroma signal in the interim between blanking intervals of horizontal video scan lines and to pass said first carrier frequency with alternating phase angles of 90° and 180° during the blanking intervals of alternate horizontal video scan lines.
Claim 104
Dependent Claim
61 words
The arrangement of claim 89 wherein said color video signal is subject to time base error and has a burst of said second carrier frequency in at least some horizontal blanking intervals, further comprising means coupled for separating said second carrier frequency bursts from said color video signal and means coupled for providing said bursts to a time base error corrector.
Claim 105
Dependent Claim
54 words
The arrangement of claim 89 wherein in said means for additively combining the delayed and undelayed bisequential amplitude and quadrature modulated chroma signals are 90° out of phase for all horizontal video scan lines, whereby the resulting non-bisequential quadrature and amplitude modulated chroma information signal comprises chroma information in National Television Systems Committee format.
Claim 106
Dependent Claim
54 words
The arrangement of claim 89 wherein in said means for additively combining, the line delayed signal is alternated in polarity on adjacent horizontal video scan lines and the undelayed signal is at constant phase angle, whereby the resulting non-bisequential quadrature and amplitude modulated chroma information signal comprises chroma information in Phase Alternating Lines format.
Claim 107
Dependent Claim
75 words
The arrangement of claim 89 wherein said bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier has its carrier polarity alternated on adjacent pairs of horizontal video scan lines and said color video signal has a marker signal indicating the phase of such polarity alternation, further comprising means coupled for alternating the polarity of said second carrier frequency reference synchronously with said marker signal, whereby said unmodulated bisequential signal is produced.
Claim 108
Independent Claim
183 words
A method for processing a color video signal in which bisequential chroma information frequency modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency, comprising the steps of: (a) separating a signal representing said bisequential frequency modulated chroma information from said color video signal; (b) frequency demodulating said bisequential frequency modulated chroma signal; (c) double balanced modulating the demodulated bisequential chroma signal with a reference source of said second carrier frequency to produce a bisequential chroma signal amplitude modulated with suppressed carrier at said second carrier frequency; (d) separating a signal representing luma information from said color video signal; (e) frequency modulating said luma signal at a third carrier frequency, said third carrier frequency being substantially lower than said second carrier frequency and being selected so that sidebands of the bisequential chroma signal amplitude modulated with suppressed carrier will not appreciably interfere with sidebands of the frequency modulated luma signal; and (f) additively combining the bisequential chroma signal amplitude modulated with suppressed carrier and the frequency modulated luma signal to produce an output signal.
Claim 109
Independent Claim
183 words
A method for processing a color video signal in which bisequential chroma information frequency modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency, comprising the steps of: (a) separating a signal representing said bisequential frequency modulated chroma information from said color video signal; (b) frequency demodulating said bisequential frequency modulated chroma signal; (c) double balanced modulating the demodulated bisequential chroma signal with a reference source of said second carrier frequency to produce a bisequential chroma signal amplitude modulated with suppressed carrier at said second carrier frequency; (d) separating a signal representing luma information from said color video signal; (e) frequency modulating said luma signal at a third carrier frequency, said third carrier frequency being substantially lower than said second carrier frequency and being selected so that sidebands of the bisequential chroma signal amplitude modulated with suppressed carrier will not appreciably interfere with sidebands of the frequency modulated luma signal; and (f) additively combining the bisequential chroma signal amplitude modulated with suppressed carrier and the frequency modulated luma signal to produce an output signal.
Claim 110
Dependent Claim
40 words
The method of claim 100 wherein the double balanced modulation with said second carrier is periodically unbalanced to produce a burst of said second carrier frequency in horizontal blanking intervals of the bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 111
Dependent Claim
57 words
The method of claim 100 wherein said color video signal is accompanied by an audio information signal, further comprising the steps of providing said audio signal frequency modulated at a fourth carrier frequency, and additively combining the frequency modulated audio signal with the frequency modulated luma signal and the bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 112
Dependent Claim
15 words
The method of claim 100, further comprising submitting said output signal to a transfer channel.
Claim 113
Dependent Claim
13 words
The method of claim 103 wherein said transfer channel comprises a recording medium.
Claim 114
Dependent Claim
15 words
The method of claim 103 wherein said transfer channel is subject to time base error.
Claim 115
Dependent Claim
70 words
The method of claim 100, further comprising the step of polarity switching said second carrier frequency reference signal on adjacent pairs of horizontal video scan lines, whereby said output signal comprises bisequential chroma information amplitude modulated with suppressed carrier, the modulated carrier being of opposite polarity on adjacent pairs of horizontal video scan lines and the modulation sideband frequencies comprising odd multiples of one quarter the horizontal scan line frequency.
Claim 116
Dependent Claim
32 words
The method of claim 106, further comprising the steps of generating a marker signal indicative of the phase of said alternating polarity carrier, and combining said marker signal with said output signal.
Claim 117
Independent Claim
136 words
A method of processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to bisequential chroma information frequency modulated at a first carrier frequency, comprising the steps of: (a) separating a signal representing bisequential chroma information amplitude modulated with suppressed carrier from said color video signal (b) double balanced modulating said bisequential chroma signal amplitude modulated with suppressed carrier, with a reference source of said second carrier frequency, to produce an unmodulated bisequential chroma signal; (c) frequency modulating said unmodulated bisequential chroma signal at said first carrier frequency; (d) separating a signal representing frequency modulated luma information from said color video signal; (e) frequency demodulating said separated luma signal; and (f) additively combining the unmodulated luma signal and the frequency modulated bisequential chroma signal.
Claim 118
Independent Claim
136 words
A method of processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to bisequential chroma information frequency modulated at a first carrier frequency, comprising the steps of: (a) separating a signal representing bisequential chroma information amplitude modulated with suppressed carrier from said color video signal (b) double balanced modulating said bisequential chroma signal amplitude modulated with suppressed carrier, with a reference source of said second carrier frequency, to produce an unmodulated bisequential chroma signal; (c) frequency modulating said unmodulated bisequential chroma signal at said first carrier frequency; (d) separating a signal representing frequency modulated luma information from said color video signal; (e) frequency demodulating said separated luma signal; and (f) additively combining the unmodulated luma signal and the frequency modulated bisequential chroma signal.
Claim 119
Dependent Claim
34 words
The method of claim 108, further comprising the step of marking the frequency modulated bisequential chroma signal to identify the modulation component of the frequency modulated bisequential chroma information in the additively combined signal.
Claim 120
Dependent Claim
58 words
The method of claim 108 wherein said color video signal is subject to time base error and has a burst of said second carrier frequency in at least some horizontal blanking intervals, further comprising the steps of separating said second carrier frequency bursts from said color video signal and providing said bursts to a time base error corrector.
Claim 121
Dependent Claim
76 words
The method of claim 108 wherein said bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier has its carrier polarity alternated on adjacent pairs of horizontal video scan lines and said color video signal has a marker signal indicating the phase of such polarity alteration, further comprising the step of alternating the polarity of said second carrier frequency reference synchronously with said marker signal, whereby said unmodulated bisequential chroma signal is produced.
Claim 122
Dependent Claim
198 words
An arrangement for processing a color video signal, in which bisequential chroma information frequency modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency, comprising: (a) means coupled for separating a signal representing said bisequential frequency modulated chroma information from said color video signal; (b) means coupled for frequency demodulating said bisequential frequency modulated chroma signal; (c) means coupled for double balanced modulating the demodulated bisequential chroma signal with a reference source of said second carrier frequency to produce a bisequential chroma signal amplitude modulated with suppressed carrier at said second carrier frequency; (d) means coupled for separating a signal representing luma information from said color video signal; (e) means coupled for frequency modulating said luma signal at a third carrier frequency, said third carrier frequency being substantially lower than said second carrier frequency and being selected so that sidebands of the bisequential chroma signal amplitude modulated with suppressed carrier will not appreciably interfere with sidebands of the frequency modulated luma signal; and (f) means coupled for additively combining the bisequential chroma signal amplitude modulated with suppressed carrier and the frequency modulated luma signal to produce an output signal.
Claim 123
Dependent Claim
198 words
An arrangement for processing a color video signal, in which bisequential chroma information frequency modulated at a first carrier frequency is translated to bisequential chroma information amplitude modulated at a second carrier frequency, comprising: (a) means coupled for separating a signal representing said bisequential frequency modulated chroma information from said color video signal; (b) means coupled for frequency demodulating said bisequential frequency modulated chroma signal; (c) means coupled for double balanced modulating the demodulated bisequential chroma signal with a reference source of said second carrier frequency to produce a bisequential chroma signal amplitude modulated with suppressed carrier at said second carrier frequency; (d) means coupled for separating a signal representing luma information from said color video signal; (e) means coupled for frequency modulating said luma signal at a third carrier frequency, said third carrier frequency being substantially lower than said second carrier frequency and being selected so that sidebands of the bisequential chroma signal amplitude modulated with suppressed carrier will not appreciably interfere with sidebands of the frequency modulated luma signal; and (f) means coupled for additively combining the bisequential chroma signal amplitude modulated with suppressed carrier and the frequency modulated luma signal to produce an output signal.
Claim 124
Dependent Claim
44 words
The arrangement of claim 112, further comprising means for periodically unbalancing said means for double balanced modulation with said second carrier to produce a burst of said second carrier frequency in horizontal blanking intervals of the bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 125
Dependent Claim
60 words
The arrangement of claim 112 wherein said color video signal is accompanied by an audio information signal, further compressing means coupled for providing said audio signal frequency modulated at a fourth carrier frequency, and means coupled for additively combining the frequency modulated audio signal with the frequency modulated luma signal and the bisequential chroma signal amplitude modulated with suppressed carrier.
Claim 126
Dependent Claim
18 words
The arrangement of claim 112 further comprising means coupled for submitting said output signal to a transfer channel.
Claim 127
Dependent Claim
13 words
The method of claim 115 wherein said transfer channel comprises a recording medium.
Claim 128
Dependent Claim
15 words
The method of claim 115 wherein said transfer channel is subject to time base error.
Claim 129
Dependent Claim
70 words
The arrangement of claim 112, further comprising means coupled for polarity switching said second carrier frequency reference signal on adjacent pairs of horizontal video scan lines, whereby said output signal comprises bisequential chroma information amplitude modulated with suppressed carrier, the modulated carrier being of opposite polarity on adjacent pairs of horizontal video scan lines and the modulation sideband frequencies comprising odd multiples of one quarter the horizontal scan line frequency.
Claim 130
Dependent Claim
35 words
The arrangement of claim 118, further comprising means coupled for generating a marker signal indicative of the phase of said alternating polarity carrier, and means coupled for combining said marker signal with said output signal.
Claim 131
Dependent Claim
151 words
An arrangement for processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to bisequential chroma information frequency modulated at a first carrier frequency, comprising: (a) means coupled for separating a signal representing bisequential chroma information amplitude modulated with suppressed carrier from said color video signal; (b) means coupled for double balanced modulating said bisequential chroma signal amplitude modulated with suppressed carrier, with a reference source of said second carrier frequency, to produce an unmodulated bisequential chroma signal; (c) means coupled for frequency modulating said unmodulated bisequential chroma signal at said first carrier frequency; (d) means coupled for separating a signal representing frequency modulated luma information from said color video signal; (e) means coupled for frequency demodulating said separated luma signal; and (f) means coupled for additively combining the unmodulated luma signal and the frequency modulated bisequential chroma signal.
Claim 132
Dependent Claim
151 words
An arrangement for processing a color video signal, in which bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier is translated to bisequential chroma information frequency modulated at a first carrier frequency, comprising: (a) means coupled for separating a signal representing bisequential chroma information amplitude modulated with suppressed carrier from said color video signal; (b) means coupled for double balanced modulating said bisequential chroma signal amplitude modulated with suppressed carrier, with a reference source of said second carrier frequency, to produce an unmodulated bisequential chroma signal; (c) means coupled for frequency modulating said unmodulated bisequential chroma signal at said first carrier frequency; (d) means coupled for separating a signal representing frequency modulated luma information from said color video signal; (e) means coupled for frequency demodulating said separated luma signal; and (f) means coupled for additively combining the unmodulated luma signal and the frequency modulated bisequential chroma signal.
Claim 133
Dependent Claim
30 words
The arrangement of claim 120, further comprising means coupled for inserting a marker signal indicative of the phase of the frequency modulated bisequential chroma information in the additively combined signal.
Claim 134
Dependent Claim
58 words
The arrangement of claim 120 wherein said color video signal is subject to time base error and has a burst of said second carrier frequency in at least some horizontal blanking intervals, further comprising means coupled for separating said second carrier frequency bursts from said color video signal and providing said bursts to a time base error corrector.
Claim 135
Dependent Claim
76 words
The arrangement of claim 120 wherein said bisequential chroma information amplitude modulated at a second carrier frequency with suppressed carrier has its carrier polarity alternated on adjacent pairs of horizontal video scan lines and said color video signal has a marker signal indicating the phase of such polarity alteration, further comprising means coupled for alternating the polarity of said second carrier frequency reference synchronously with said marker signal, whereby said unmodulated bisequential chroma signal is produced.
Claim 136
Dependent Claim
37 words
A signal recording medium having impressed thereon a color video signal comprising the additive combination of bisequential chroma information amplitude modulated with suppressed carrier at a first frequency and luma information frequency modulated at a second frequency.
Claim 137
Dependent Claim
37 words
A signal recording medium having impressed thereon a color video signal comprising the additive combination of bisequential chroma information amplitude modulated with suppressed carrier at a first frequency and luma information frequency modulated at a second frequency.
Claim 138
Dependent Claim
13 words
The signal recording medium of claim 124, comprising a magnetic signal storage medium.
Claim 139
Dependent Claim
13 words
The signal recording medium of claim 124, comprising an optical signal storage medium.
Claim 140
Dependent Claim
13 words
The signal recording medium of claim 124, comprising a capacitive signal storage medium.
Claim 141
Dependent Claim
34 words
The signal recording medium of claim 124 wherein said color video signal includes periodic bursts of a reference frequency for use in correction of time base error occurring upon retrieval of said impressed signal.
Claim 142
Dependent Claim
18 words
The signal recording medium of claim 124 wherein said second frequency is substantially higher than said first frequency.
Claim 143
Dependent Claim
22 words
The signal recording medium of claim 124 wherein an audio information signal frequency modulated at a third carrier frequency is impressed thereon.
Claim 144
Dependent Claim
26 words
The signal recording medium of claim 130 wherein said audio information is additively combined with said color video signal prior being impressed on the recording medium.
Claim 145
Dependent Claim
19 words
The signal recording medium of claim 130 wherein said third carrier frequency is lower than said first carrier frequency.
Claim 146
Dependent Claim
30 words
The signal recording medium of claim 124 wherein the carrier polarity of said bisequential chroma information amplitude modulated with suppressed carrier alternates on adjacent pairs of horizontal video scan lines.
Claim 147
Dependent Claim
26 words
The signal recording medium of claim 133 wherein said color video signal further includes a marker signal for indicating the phase of said alternating carrier polarity.
References Cited (Backward Citations)
US3717725A
Cited
US3617620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |