Patent US3786176A successfully refreshed from Google Patents.
US3786176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and/or reproducing system
Assignee: Sony Corp
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Filing: 1972-11-13
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Granted: 1974-01-15
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Expires: 1992-11-13
Abstract
Abstract An improved system for magnetic recording and/or reproducing a color television signal including a luminance signal and a chrominance signal which contains a burst signal therein. Before recording the television signal, the chrominance signal is frequency-converted to a frequency band lower than its original one and the burst signal is extracted from the chrominance signal. The burst signal is then combined with the luminance signal to frequency-modulate a carrier signal having a predetermined frequency, then both the frequency-converted chrominance signal and the frequency-modulated signal are recorded on a magnetic medium. When the magnetic medium is played back, the frequency-converted chrominance signal is frequencyreconverted to the original frequency band by means of a reference signal the phase of which is controlled by the burst signal reproduced by frequency-demodulation so that phase erros of the reproduced chrominance signal are diminished.
Inventors
- 👤 H Narahara
- 👤 T Numakura
- 👤 Y Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:58
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/83; H04N9/86
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
144 words
A system for magnetic recording of a composite color television signal including a first band comprising a luminance signal and a second band comprising chrominance and burst signals, and being divided into intervals including field, line, and blanking intervals, said system comprising: a. means for separating the luminance signal and the chrominance signal from the composite color television signal; b. means for frequency-converting said separated chrominance signal to a frequency band lower than its original one; c. means for extracting said burst signal from said frequencyconverted chrominance signal; d. means for combining said separated luminance signal and said extracted burst signal into a combined signal; e. means for frequency-modulating a carrier signal by said combined signal to produce a frequency-modulated signal; and f. means for combining said frequency-modulated signal and said frequency-converted chrominance signal and for recording both of them on a magnetic medium.
Claim 2
Independent Claim
144 words
A system for magnetic recording of a composite color television signal including a first band comprising a luminance signal and a second band comprising chrominance and burst signals, and being divided into intervals including field, line, and blanking intervals, said system comprising: a. means for separating the luminance signal and the chrominance signal from the composite color television signal; b. means for frequency-converting said separated chrominance signal to a frequency band lower than its original one; c. means for extracting said burst signal from said frequencyconverted chrominance signal; d. means for combining said separated luminance signal and said extracted burst signal into a combined signal; e. means for frequency-modulating a carrier signal by said combined signal to produce a frequency-modulated signal; and f. means for combining said frequency-modulated signal and said frequency-converted chrominance signal and for recording both of them on a magnetic medium.
Claim 3
Dependent Claim
26 words
The system according to claim 1, wherein said frequency-converting means converts the chrominance and burst signals to a substantially lower frequency band than said frequency-modulated signal.
Claim 4
Dependent Claim
35 words
The system according to claim 2, wherein said means for producing the combined signal combines said extracted burst signal with said separated luminance signal so that said burst signal occurs during a horizontal blanking interval.
Claim 5
Dependent Claim
34 words
The system according to claim 3 comprising, in addition, gating means for gating alternating substantially equal intervals of at least the chrominance signal to record only said gated intervals of the chrominance signal component.
Claim 6
Dependent Claim
23 words
The system according to claim 4, wherein said frequency-converting means is connected to said gating means for gating said frequency-converted chrominance signal component.
Claim 7
Dependent Claim
19 words
The system according to claim 5, wherein said gating means gates alternate line intervals of said frequency-converted chrominance signal.
Claim 8
Dependent Claim
186 words
A system according to claim 4 comprising, in addition, reproducing means to reproduce the signals recorded on said magnetic medium, said reproducing means comprising: a. means for picking up said frequency-modulated signal and the recorded intervals of said frequency-converted chrominance signal from said magnetic medium; b. means for frequency-demodulating said picked up frequency-modulated signal to produce the combined signal; c. means for extracting said frequency-converted burst signal from said combined signal; d. means for generating a reference signal to be used for frequency-reconverting said picked up chrominance signal component; e. supplying means to supply said burst signal extracted from said combined signal to said reference signal generating means to control the phase of said reference signal; f. means for frequency-reconverting said picked up intervals of the chrominance signal component with said reference signal to the original frequency band of the chrominance signal. g. means for delaying said picked up intervals of the chrominance signal component to form delayed replicas of said picked up intervals, and h. means for combining said picked up intervals of the chrominance signals and said delayed replicas to form a continuous signal.
Claim 9
Dependent Claim
20 words
The system according to claim 1 comprising, in addition, reproducing means to reproduce the signals recorded on said magnetic medium.
Claim 10
Dependent Claim
128 words
A system according to claim 8, wherein said reproducing means comprises: a. means for picking up said frequency-modulated signal and said frequency-converted Chrominance signal from said magnetic medium; b. means for frequency-demodulating said picked up frequency-modulated signal to reproduce the combined signal of the frequency-converted burst signal and the luminance signal; c. means for extracting said frequency-converted burst signal from said combined signal; d. means for generating a reference signal for frequency-reconverting said picked up chrominance signal; e. supplying means to supply said burst signal extracted from said combined signal to said reference signal generating means to control the phase of said reference signal; and f. means for utilizing said reference signal to frequency-convert said picked up chrominance signal to the original frequency band of the chrominance signal.
Claim 11
Independent Claim
115 words
A system for reproducing a color television signal from a recorded signal that comprises a frequency-modulated signal including a luminance signal and a frequency-converted burst signal combined and frequency-modulated on one carrier, said frequency-modulated signal being combined with a frequency-converted chrominance signal, said system comprising: a. means for picking up said recorded signal; b. means for separating said frequency-modulated signal from said frequency-converted chrominance signal; c. means for frequency-demodulating said frequency-modulated signal to obtain the frequency-converted burst signal; d. means for generating a reference signal; e. means for controlling the phase of said reference signal by the frequency-converted burst signal; and f. means for utilizing said reference signal to frequency-reconvert the separated frequency-converted chrominance signal.
Claim 12
Independent Claim
115 words
A system for reproducing a color television signal from a recorded signal that comprises a frequency-modulated signal including a luminance signal and a frequency-converted burst signal combined and frequency-modulated on one carrier, said frequency-modulated signal being combined with a frequency-converted chrominance signal, said system comprising: a. means for picking up said recorded signal; b. means for separating said frequency-modulated signal from said frequency-converted chrominance signal; c. means for frequency-demodulating said frequency-modulated signal to obtain the frequency-converted burst signal; d. means for generating a reference signal; e. means for controlling the phase of said reference signal by the frequency-converted burst signal; and f. means for utilizing said reference signal to frequency-reconvert the separated frequency-converted chrominance signal.
Claim 13
Dependent Claim
39 words
The system according to claim 10, wherein said means for controlling the frequency of said reference signal comprises means for utilizing said reference signal to frequency-reconvert said burst signal from said frequency-demodulating means to the original burst signal frequency.
Claim 14
Dependent Claim
71 words
The system according to claim 11, wherein said reference signal generating means comprises: a. an oscillator generating a constant frequency signal; b. a phase detector for comparing in phase said constant frequency signal with said frequency-reconverted burst signal; c. a variable frequency oscillator controlled by an output of said phase detector and frequency converter for converting the frequency of said constant frequency signal with an output of said variable frequency oscillator.
Claim 15
Independent Claim
157 words
A system for magnetic recording of a composite color television signal including luminance and chrominance and burst signals and being divided into line intervals, each including a blanking interval, said system comprising: a. means for separating the luminance signal component and the chrominance signal component from the composite color television signal; b. first converting means to frequency-convert said separated chrominance signal to a frequency band lower than its original one; c. means for extracting said burst signal from said separated chrominance signal component; d. second converting means to frequency-convert said extracted burst signal to a frequency lower than its original frequency; e. means for combining said separated luminance signal and said frequency-converted burst signal into a combined signal; f. means for frequency-modulating a carrier signal by said combined signal to produce a frequency-modulated signal; and g. means for combining said frequency-modulated signal and said frequency-converted chrominance signal and for recording both of them on a magnetic medium.
Claim 16
Independent Claim
157 words
A system for magnetic recording of a composite color television signal including luminance and chrominance and burst signals and being divided into line intervals, each including a blanking interval, said system comprising: a. means for separating the luminance signal component and the chrominance signal component from the composite color television signal; b. first converting means to frequency-convert said separated chrominance signal to a frequency band lower than its original one; c. means for extracting said burst signal from said separated chrominance signal component; d. second converting means to frequency-convert said extracted burst signal to a frequency lower than its original frequency; e. means for combining said separated luminance signal and said frequency-converted burst signal into a combined signal; f. means for frequency-modulating a carrier signal by said combined signal to produce a frequency-modulated signal; and g. means for combining said frequency-modulated signal and said frequency-converted chrominance signal and for recording both of them on a magnetic medium.
Claim 17
Dependent Claim
32 words
The system according to claim 13, wherein said first and second converting means frequency-convert the carrier frequency of said separated chrominance signal and said extracted burst signal, respectively, to the same frequency.
Claim 18
Independent Claim
94 words
A system for magnetic recording of a color television signal comprising a luminance signal in a first frequency band and a chrominance signal and a burst Signal, said system comprising: a. means for frequency-converting said chrominance signal to a frequency band lower than its original one; b. means for extracting the burst signal from said frequency-converted chrominance signal; c. means for frequency-modulating a carrier signal by said extracted frequency-converted burst signal; and d. means supplied with said frequency-modulated signal and said frequency-converted chrominance signal component for recording both of them on a magnetic medium.
Claim 19
Independent Claim
94 words
A system for magnetic recording of a color television signal comprising a luminance signal in a first frequency band and a chrominance signal and a burst Signal, said system comprising: a. means for frequency-converting said chrominance signal to a frequency band lower than its original one; b. means for extracting the burst signal from said frequency-converted chrominance signal; c. means for frequency-modulating a carrier signal by said extracted frequency-converted burst signal; and d. means supplied with said frequency-modulated signal and said frequency-converted chrominance signal component for recording both of them on a magnetic medium.
Claim 20
Dependent Claim
22 words
A system according to claim 15 comprising, in addition, gating means for gating alternating, substantially equal intervals of said chrominance signal component.
Claim 21
Dependent Claim
113 words
A system according to claim 15 comprising, in addition, reproducing means to reproduce the signals recorded on said magnetic medium, said reproducing means comprising: a. means for picking up said frequency-modulated signal and said frequency-converted chrominance signal component from said magnetic medium; b. means for frequency-demodulating said frequency-modulated signal to produce the frequency-converted burst signal; c. means for generating a reference signal; d. means for supplying said burst signal produced by the frequency demodulation to said reference signal generating means to control the phase of said reference signal; and e. means for frequency-reconverting said picked up frequency-converted chrominance signal component with said reference signal to the original frequency band of the chrominance signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |