Patent US3845237A successfully refreshed from Google Patents.
US3845237A
Expired / Lapsed
US
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System for recording and/or reproducing color television signals
Assignee: Sony Corp
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Filing: 1973-01-26
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Granted: 1974-10-29
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Expires: 1993-01-26
Abstract
Abstract A system capable of recording and/or reproducing color television signals formed in accordance with any of the existing color television standards, such as, the NTSC standard and the PAL standard, includes a magnetic recording and/or reproducing apparatus having rotary magnetic heads for recording or reproducing signals on a magnetic medium, such as a magnetic tape, and in which, for recording, the color sub-carrier frequency of the received signal is converted to a first predetermined frequency, irrespective of the original color subcarrier frequency characteristic of the color television standard with which the original or received signal was formed, and the rotational speed of the heads is selectively determined in accordance with the field frequency characteristic of the color television standard of the received signal, whereas, for reproducing the recorded signal, the heads are rotated at the same speed as for recording and the color sub-carrier frequency of the reproduced signal is reconverted to a second predetermined frequency irrespective of the original color sub-carrier frequency. The recording and/or reproducing system further includes a display apparatus for displaying color images corresponding to the reproduced signal from the recording and/or reproducing apparatus, and in which selectively operable circuits are provided for demodulating the chrominance signal included in the reproduced signal, and thereby obtaining color difference signals, in accordance with the phase relationship of such color difference signals on the color sub-carrier which is characteristic of the color television standard of the original signal.
Inventors
- 👤 K Yamakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:08
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/1808; H; H04; H04N; H04N9/00; H04N9/79; H04N9/7921; H04N9/7925; H04N9/80; H04N9/82; H04N9/83
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
299 words
A system for selectively recording and/or reproducing NTSC and PAL color television signals respectively having first and second different standard field frequencies and first and second different standard color subcarrier frequencies of the chrominance signal portions thereof, comprising a. rotary magnetic head means for selectively recording and reproducing signals on a magnetic tape; b. means for selectively rotating said head means at speeds respectively corresponding to said first and second different field frequencies of the NTSC or PAL signals to be recorded and/or reproduced; c. recording circuit means including reference signal generating means operable to selectively produce first and second reference signals having respective frequencies that differ from each other by the difference between said first and second standard color subcarrier frequencies, frequency-converting means receiving said chrominance signal portion of the NTSC or PAL color television signal to be recorded and a corresponding selected one of said first and second reference signals for frequency-converting the color subcarrier frequency of said chrominance signal portion to a first predetermined subcarrier frequency that is lower than the standard color subcarrier frequency of either of said signals to be recorded, and means for applying the frequency-converted chrominance signal portion to said head means for recording by the latter on the magnetic tape; and d. reproducing circuit means including reference signal generating means operable to produce a third reference signal, and frequency-reconverting means receiving said third reference signal and the chrominance signal portion reproduced from the tape by said head means and reconverting the color subcarrier frequency of said reproduced chrominance signal portion to a second predetermined subcarrier frequency, whereby the frequency-reconverted chrominance signal portion has its original field frequency and said second predetermined subcarrier frequency regardless of said standard color subcarrier frequency of the NTSC or PAL color television signal prior to recording.
Claim 2
Independent Claim
299 words
A system for selectively recording and/or reproducing NTSC and PAL color television signals respectively having first and second different standard field frequencies and first and second different standard color subcarrier frequencies of the chrominance signal portions thereof, comprising a. rotary magnetic head means for selectively recording and reproducing signals on a magnetic tape; b. means for selectively rotating said head means at speeds respectively corresponding to said first and second different field frequencies of the NTSC or PAL signals to be recorded and/or reproduced; c. recording circuit means including reference signal generating means operable to selectively produce first and second reference signals having respective frequencies that differ from each other by the difference between said first and second standard color subcarrier frequencies, frequency-converting means receiving said chrominance signal portion of the NTSC or PAL color television signal to be recorded and a corresponding selected one of said first and second reference signals for frequency-converting the color subcarrier frequency of said chrominance signal portion to a first predetermined subcarrier frequency that is lower than the standard color subcarrier frequency of either of said signals to be recorded, and means for applying the frequency-converted chrominance signal portion to said head means for recording by the latter on the magnetic tape; and d. reproducing circuit means including reference signal generating means operable to produce a third reference signal, and frequency-reconverting means receiving said third reference signal and the chrominance signal portion reproduced from the tape by said head means and reconverting the color subcarrier frequency of said reproduced chrominance signal portion to a second predetermined subcarrier frequency, whereby the frequency-reconverted chrominance signal portion has its original field frequency and said second predetermined subcarrier frequency regardless of said standard color subcarrier frequency of the NTSC or PAL color television signal prior to recording.
Claim 3
Dependent Claim
77 words
A system according to claim 1; wherein said reference signal generating means of said recording circuit means includes first and second oscillators respectively producing said first and second reference signals having different frequencies, switching means for deriving said selected one of said first and second reference signals from the corresponding oscillator in accordance with the standard color subcarrier frequency of the signal to be recorded, and means for supplying the derived reference signal to said frequency-converting means.
Claim 4
Dependent Claim
155 words
A system according to claim 1; wherein said recording circuit means further includes means for separating a luminance signal portion from the remainder of the color television signal to be recorded means for frequency modulating said separated luminance signal portion, said first predetermined subcarrier frequency being selected so that the band width of said frequency-converted chrominance signal portion is below the band width of the frequency-modulated luminance signal portion, and means for combining said frequency-modulated luminance signal portion with said frequency-converted chrominance signal portion prior to application of the resulting combined signal to said head means; and wherein said reproducing circuit means further includes means for separating the reproduced frequency-modulated luminance signal portion from the remainder of the signal reproduced by said head means, means for demodulating the separated frequency-modulated luminance signal portion, and means for combining the demodulated luminance signal portion with said frequency-reconverted chrominance signal portion to provide a reproduced color television signal.
Claim 5
Dependent Claim
62 words
A system according to claim 1; further comprising color image display means including a color image display tube having scanning means and circuit means receiving said frequency-reconverted chrominance signal portion for causing said tube to display a color image corresponding thereto irrespective of the standard field frequency and color subcarrier frequency of the color television signal which was recorded and then reproduced.
Claim 6
Dependent Claim
134 words
A system according to claim 4; wherein said circuit means of the color image display means includes delay means for delaying the received chrominance signal portion for substantially one line interval to produce a delayed replica of said received chrominance signal portion, switching means for alternately passing, in successive line intervals, said delayed replica and said received chrominance signal portion to produce a reformed chrominance signal portion identical in duration to said received chrominance signal portion, demodulating means receiving said reformed chrominance signal portion and producing corresponding color signals for operating said color image display tube, and means operative in response to said received chrominance signal portion for prOducing scanning signals controlling said scanning means of the image display tube in accordance with the field and line frequencies of said received chrominance signal portion.
Claim 7
Dependent Claim
52 words
A system according to claim 5; in which said circuit means of the image display means includes switch control means actuable when an NTSC signal is recorded to halt the switching operation of said switching means so that the latter passes said received chrominance signal portion during all of said line intervals.
Claim 8
Dependent Claim
261 words
A system according to claim 6; in which said circuit means of the image display means further includes means for extracting a burst signal from said received chrominance signal portion, demodulating reference signal generating means driven by the extracted burst signal for producing a first demodulating reference signal, phase inverting means for inverting the phase of said first demodulating reference signal and supplying the resulting phase-inverted first demodulating reference signal to one of said demodulating means, phase-inverting means for inverting the phase of said received chrominance signal portion and producing a phase-inverted chrominance signal portion, second switching means ganged with the first mentioned switching means and being effective, during said switching operation of the latter, to alternately pass, in successive line intervals, said phase-inverted chrominance signal portion and said received chrominance signal portion and thereby produce a second reformed chrominance signal portion identical in duration to said received chrominance signal portion, means for extracting a burst signal from said reformed second chrominance signal portion, second demodulating reference signal generating means driven by the last mentioned extracted burst signal for producing a second demodulating reference signal, and second switch control means supplying said second demodulating reference signal directly to another of said demodulating means during operation of said first and second switch means when a PAL signal is recorded and being changed-over to supply said second demodulating reference signal to said other demodulating means by way of phase shifting means when an NTSC signal is recorded and said first switching means has its operation halted by the first mentioned switch control means.
Claim 9
Dependent Claim
167 words
A system according to claim 5; in which said circuit means of the image display means includes means for extracting a burst signal from said reformed chrominance signal, demodulating reference signal generating means driven by the extracted burst signal for producing a demodulating reference signal, control switch means receiving said demodulating reference signal and being actuable to first and second positions when NTSC and PAL signals are respectively recorded, phase-shifting means and phase-inverting means receiving said demodulating reference signal from said control switch means in said first position and respectively supplying phase-shifted and phase-inverted demodulating reference signals to one of said demodulating means and to another of said demodulating means, and second and third phase-shifting means receiving said demodulating reference signal from said control switch means in said second position of the latter and being operative to delay the phase of said demodulating reference signal by different phase angles for supplying different phase-delayed demodulating reference signals to said one demodulating means and said other demodulating means, respectively.
Claim 10
Independent Claim
651 words
A system for selectively recording and/or reproducing color television signals respectively having different standard field frequencies and different standard color subcarrier frequencies of the chrominance signal portions thereof, comprising a. rotary magnetic head means for selectively recording and reproducing signals on a magnetic tape; b. means for selectively rotating said head means at speeds respectively corresponding to said different field frequencies of the signals to be recordEd and/or reproduced; c. recording circuit means including reference signal generating means operable to produce first and second reference signals having different frequencies, frequency-converting means receiving said chrominance signal portion of the color television signal to be recorded and a corresponding selected one of said first and second reference signals for frequency-converting the color subcarrier frequency of said chrominance signal portion to a first predetermined subcarrier frequency that is lower than the standard color subcarrier frequency of said signal to be recorded, and means for applying the frequency-converted chrominance signal portion to said head means for recording by the latter on the magnetic tape; d. reproducing circuit means including frequency-reconverting means receiving the chrominance signal portion reproduced from the tape by said head means and reconverting the color subcarrier frequency of said reproduced chrominance signal portion to a second predetermined subcarrier frequency, whereby the frequency-reconverted chrominance signal portion has its original field frequency and said second predetermined subcarrier frequency regardless of said standard color subcarrier frequency of the color television signal prior to recording; and e. color image display means including a color image display tube having scanning means and circuit means receiving said frequency-reconverted chrominance signal portion for causing said tube to display a color image corresponding thereto irrespective of the standard field frequency and color subcarrier frequency of the color television signal which was recorded and then reproduced, said circuit means of the color image display means including delay means for delaying the received chrominance signal portion for substantially one line interval to produce a delayed replica of said received chrominance signal portion, switching means for alternately passing, in successive line intervals, said delayed replica and said received chrominance signal portion to produce a reformed chrominance signal portion identical in duration to said received chrominance signal portion, demodulating means receiving said reformed chrominance signal portion and producing corresponding color signals for operating said color image display tube, means operative in response to said received chrominance signal portion for producing scanning signals controlling said scanning means of the image display tube in accordance with the field and line frequencies of said received chrominance signal portion, means for extracting a burst signal from said reformed chrominance signal, reference signal generating means driven by the extracted burst signal for producing a demodulating reference signal, control switch means receiving said demodulating reference signal and being actuable to first and second positions, phase-shifting means and phase-inverting means receiving said demodulating reference signal from said control switch means in said first position and respectively supplying phase-shifted and phase-inverted demodulating reference signals to one of said demodulating means and to another of said demodulating means, second and third phase-shifting means receiving said demodulating reference signal from said control switch means in said second position of the latter and being operative to delay the phase of said reference signal by different phase angles for supplying different phase-delayed reference signals to said one demodulating means and said other demodulating means, respectively, means for extracting a burst signal from said received chrominance signal portion, phase-shifting means receiving the last mentioned burst signal and producing phase-advanced and phase-delayed replicas thereof, second switching means ganged with the first mentioned switching means for alternately passing, in successive line intervals, said phase-advanced and phase-delayed replicas of the burst signal, oscillating means driven by the output of said second swiTching means, and correcting signal generating means operable when no output is derived from said oscillating means to invert the switching operation of said first and second switching means.
Claim 11
Independent Claim
651 words
A system for selectively recording and/or reproducing color television signals respectively having different standard field frequencies and different standard color subcarrier frequencies of the chrominance signal portions thereof, comprising a. rotary magnetic head means for selectively recording and reproducing signals on a magnetic tape; b. means for selectively rotating said head means at speeds respectively corresponding to said different field frequencies of the signals to be recordEd and/or reproduced; c. recording circuit means including reference signal generating means operable to produce first and second reference signals having different frequencies, frequency-converting means receiving said chrominance signal portion of the color television signal to be recorded and a corresponding selected one of said first and second reference signals for frequency-converting the color subcarrier frequency of said chrominance signal portion to a first predetermined subcarrier frequency that is lower than the standard color subcarrier frequency of said signal to be recorded, and means for applying the frequency-converted chrominance signal portion to said head means for recording by the latter on the magnetic tape; d. reproducing circuit means including frequency-reconverting means receiving the chrominance signal portion reproduced from the tape by said head means and reconverting the color subcarrier frequency of said reproduced chrominance signal portion to a second predetermined subcarrier frequency, whereby the frequency-reconverted chrominance signal portion has its original field frequency and said second predetermined subcarrier frequency regardless of said standard color subcarrier frequency of the color television signal prior to recording; and e. color image display means including a color image display tube having scanning means and circuit means receiving said frequency-reconverted chrominance signal portion for causing said tube to display a color image corresponding thereto irrespective of the standard field frequency and color subcarrier frequency of the color television signal which was recorded and then reproduced, said circuit means of the color image display means including delay means for delaying the received chrominance signal portion for substantially one line interval to produce a delayed replica of said received chrominance signal portion, switching means for alternately passing, in successive line intervals, said delayed replica and said received chrominance signal portion to produce a reformed chrominance signal portion identical in duration to said received chrominance signal portion, demodulating means receiving said reformed chrominance signal portion and producing corresponding color signals for operating said color image display tube, means operative in response to said received chrominance signal portion for producing scanning signals controlling said scanning means of the image display tube in accordance with the field and line frequencies of said received chrominance signal portion, means for extracting a burst signal from said reformed chrominance signal, reference signal generating means driven by the extracted burst signal for producing a demodulating reference signal, control switch means receiving said demodulating reference signal and being actuable to first and second positions, phase-shifting means and phase-inverting means receiving said demodulating reference signal from said control switch means in said first position and respectively supplying phase-shifted and phase-inverted demodulating reference signals to one of said demodulating means and to another of said demodulating means, second and third phase-shifting means receiving said demodulating reference signal from said control switch means in said second position of the latter and being operative to delay the phase of said reference signal by different phase angles for supplying different phase-delayed reference signals to said one demodulating means and said other demodulating means, respectively, means for extracting a burst signal from said received chrominance signal portion, phase-shifting means receiving the last mentioned burst signal and producing phase-advanced and phase-delayed replicas thereof, second switching means ganged with the first mentioned switching means for alternately passing, in successive line intervals, said phase-advanced and phase-delayed replicas of the burst signal, oscillating means driven by the output of said second swiTching means, and correcting signal generating means operable when no output is derived from said oscillating means to invert the switching operation of said first and second switching means.
Claim 12
Dependent Claim
196 words
A system according to claim 3; further comprising color image display means including a color image display tube having scanning means, means receiving said reproduced color television signal for producing scanning signals controlling said scanning means of the image display tube in accordance with the field and line frequencies of said reproduced color television signal, means receiving the frequency-reconverted chrominance signal portion of said reproduced color television signal for providing a chrominance signal which is unchanged in phase in successive line intervals when NTSC and PAL signals are respectively recorded, first and second demodulating means receiving said chrominance signal which is unchanged in phase, demodulating signal generating means supplying to said first and second demodulating means first and second demodulating signals which have said second predetermined subcarrier frequency and which selectively have the phases of said first and second color difference signals in said chrominance signal which is unchanged in phase when NTSC and PAL signals are respectively recorded, whereby said first and second demodulating means respectively produce said first and second color difference signals, and means receiving said first and second color difference signals for causing said tube to display a color image corresponding thereto.
Claim 13
Dependent Claim
99 words
A system according to claim 10; in which said means for providing a chrominance signal which is unchanged in phase includes delay means for delaying the frequency-reconverted chrominance signal portion of the reproduced color television signal for substantially one line interval to produce a delayed replica of said frequency-reconverted chrominance signal portion, switching means operative at least when a PAL signal is recorded for alternately passing, in successive line intervals, said delayed replica and said frequency-reconverted chrominance signal portion to produce said chrominance signal which is unchanged in phase and identical in duration to said frequency-reconverted chrominance signal portion.
Claim 14
Dependent Claim
49 words
A system according to claim 11; in which switch control means is actuable, when an NTSC is recorded, to halt the switching operation of said switching means so that the latter passes said frequency-reconverted chrominance signal portion of the reproduced color television signal during all of said line intervals.
Claim 15
Dependent Claim
249 words
A system according to claim 12; in which said demodulating signal generating means includes means for extracting a burst signal from said chrominance signal portion of the reproduced color television signal, reference signal generating means driven by the extracted burst signal for producing a first demodulating reference signal at said second predetermined sub-carrier frequency, phase inverting means for inverting the phase of said first demodulating reference signal and supplying the resulting first demodulating signal to said first demodulating means, phase-inverting means for inverting the phase of said chrominance signal portion of the reproduced color television signal and producing a phase-inverted chrominance signal portion, second switching means ganged with the first mentioned switching means and being effective, during said switching operation of the latter when a PAL signal is recorded, to alternately pass, in successive line intervals, said phase-inverted chrominance signal portion and said chrominance signal portion of the reproduced color television signal, means for extracting a burst signal from the output of said second switching means, means for producing a second demodulating reference signal from the last mentioned burst signal and which also has said second predetermined subcarrier frequency, and second switch control means operative, when a PAL signal is recorded, to suppLy said second demodulating reference signal to said second demodulating means as said second demodulating signal therefor, said second switch control means being actuable, when an NTSC signal is recorded, to supply said second demodulating reference signal to phase shifting means which produces said second demodulating signal.
Claim 16
Dependent Claim
172 words
A system according to claim 11; in which said switching means is operative when NTSC and PAL signals are recorded, and said demodulating signal generating means includes means for extracting a burst signal from said chrominance signal which is unchanged in phase, reference signal generating means driven by the extracted burst signal for producing a demodulating reference signal, control switch means receiving said demodulating reference signal and being actuable to first and second positions when NTSC and PAL signals are respectively recorded, phase-shifting means and phase-inverting means receiving said demodulating reference signal from said control switch means in said first position and respectively supplying said first and second demodulating signals to said first and second demodulating means, and second and third phase-shifting means receiving said demodulating reference signal from said control switch means in said second position of the latter and being operative to delay the phase of said demodulating reference signal by different phase angles for supplying said first and second demodulating signals to said first and second demodulating means, respectively.
Claim 17
Dependent Claim
107 words
A system according to claim 14, means are provided for extracting a burst signal from said chrominance signal portion of the reproduced color television signal, phase-shifting means receive the last mentioned burst signal and produce phase-advanced and phase-delayed replicas thereof, second switching means is ganged with the first mentioned switching means for alternately passing, in successive line intervals, said phase-advanced and phase-delayed replicas of the burst signal, oscillating means is driven by the output of said second switching means, and correcting signal generating means is operable when no output is derived from said oscillating means to invert the switching operation of said first and second switching means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |