US3968513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for recording a color television signal with reduced bandwidth
Assignee: US Philips Corp
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Filing: 1974-06-06
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Granted: 1976-07-06
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Expires: 1994-06-06
Abstract
Abstract A color television system for the combined transmission of a luminance signal and a chrominance signal. The chrominance signal is added to a carrier as a frequency modulation, after which the modulated carrier is amplitude-modulated by the luminance signal. The system is extremely suited for use with a disc-shaped record carrier. The color television signal is then recorded as a trackwidth variation of a spiral track provided on the record carrier.
Inventors
- 👤 Maarten Rutger DE Haan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:06
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/83; H04N11/00; H04N11/06; H04N11/12; H04N9/797; H04N9/835
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
56 words
A disc-shaped record carrier provided with a spiral track on which a colour television signal is recorded, wherein said colour television signal is recorded in the track as a trackwidth modulation, the chrominance signal being recorded as a frequency modulation of a carrier and the luminance signal as an amplitude modulation of said frequency modulated carrier.
Claim 2
Dependent Claim
56 words
A disc-shaped record carrier provided with a spiral track on which a colour television signal is recorded, wherein said colour television signal is recorded in the track as a trackwidth modulation, the chrominance signal being recorded as a frequency modulation of a carrier and the luminance signal as an amplitude modulation of said frequency modulated carrier.
Claim 3
Independent Claim
79 words
A system for recording a color television signal having luminance and chrominance components, said system comprising a frequency modulator having an input means for receiving said chrominance component and an output means for supplying a frequency modulated first carrier signal; and an amplitude modulator having a first input means for receiving said luminance component, a second input coupled to said frequency modulator output, and an output means for supplying said frequency modulated signal amplitude modulated by said luminance component.
Claim 4
Independent Claim
79 words
A system for recording a color television signal having luminance and chrominance components, said system comprising a frequency modulator having an input means for receiving said chrominance component and an output means for supplying a frequency modulated first carrier signal; and an amplitude modulator having a first input means for receiving said luminance component, a second input coupled to said frequency modulator output, and an output means for supplying said frequency modulated signal amplitude modulated by said luminance component.
Claim 5
Dependent Claim
25 words
A colour television system as claimed in claim 2, wherein said chrominance component has a carrier frequency interlaced with respect to the first carrier frequency.
Claim 6
Dependent Claim
26 words
A colour television system as claimed in claim 2, wherein the chrominance component has a carrier frequency having a lower frequency than the standard chrominance carrier.
Claim 7
Dependent Claim
26 words
A colour television system as claimed in claim 2, wherein the chrominance component and the luminance component contained in the transmitted signal occupy separate frequency bands.
Claim 8
Dependent Claim
18 words
A colour television system as claimed in claim 5, wherein the chrominance signal comprises the standard chrominance signal.
Claim 9
Dependent Claim
33 words
A colour television system as claimed in claim 2, further comprising a disc-shaped record carrier, and means for recording the amplitude modulator output signal on the disc in the form of trackwidth variations.
Claim 10
Dependent Claim
25 words
A colour television system as claimed in claim 7, wherein said recording means comprises an optical modulator whose luminous intensity varies with the applied signal.
Claim 11
Independent Claim
76 words
A system for reproducing a color television signal having a luminance component amplitude modulating a first carrier signal frequency modulated by the chrominance component, said system comprising an input means for receiving said recorded signal; an amplitude demodulator having an input coupled to said input means, and an output means for supplying said luminance component; and a frequency demodulator having an input coupled to said input means, and an output means for providing said chrominance component.
Claim 12
Independent Claim
76 words
A system for reproducing a color television signal having a luminance component amplitude modulating a first carrier signal frequency modulated by the chrominance component, said system comprising an input means for receiving said recorded signal; an amplitude demodulator having an input coupled to said input means, and an output means for supplying said luminance component; and a frequency demodulator having an input coupled to said input means, and an output means for providing said chrominance component.
Claim 13
Dependent Claim
23 words
A color television system as claimed in claim 9, wherein the first carrier comprises a pilot tone for correction of recording timing errors.
Claim 14
Dependent Claim
15 words
A system as claimed in claim 10 wherein said errors comprise chrominance signal phase errors.
Claim 15
Dependent Claim
21 words
A system as claimed in claim 9 further comprising a limiter coupled between said input means and said frequency demodulator input.
Claim 16
Dependent Claim
20 words
A system as claimed in claim 12 further comprising a bandpass filter coupled between said limiter and said input 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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |