Patent US3764739A successfully refreshed from Google Patents.
US3764739A
Expired / Lapsed
US
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Color video recording and play back system
Assignee: Individual
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Filing: 1971-01-25
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Granted: 1973-10-09
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Expires: 1991-01-25
Abstract
Abstract A color video recording system wherein the incoming video signal is separated into chroma and luminance signals by a comb filter and the chroma signal thereafter recorded on the lower end of the RF spectrum of the record medium and the luminance recorded on the upper end of said RF spectrum is disclosed. Systems for meeting NTSC and PAL standards and utilizing quadrature modulation and line sequential modulation, either AM or FM, for transcoding the chroma signal are described.
Inventors
- 👤 Y Faroudja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:35
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/83; H04N9/7921; H04N9/7925
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
157 words
A color video recording system comprising a video recorder including a record driver means for recording incoming video signals on a magnetic record medium, an input signal processing circuit comprising a comb filter for separating the chroma signal from the lUminance signal in the incoming video signal, means coupling said comb filter to said record driver means for recording the luminance signal on one portion of the RF spectrum of the record medium, means coupling said comb filter to said record driver means for recording the chroma signal on another portion of the RF spectrum of the record medium separate from said one portion, and a playback signal processing circuit coupled to said video recorder comprising means for recombining the luminance signal from the one portion of the RF spectrum of the record medium with the chroma signal from the other portion of the RF spectrum of the record medium to produce a reconstituted video output signal.
Claim 2
Dependent Claim
157 words
A color video recording system comprising a video recorder including a record driver means for recording incoming video signals on a magnetic record medium, an input signal processing circuit comprising a comb filter for separating the chroma signal from the lUminance signal in the incoming video signal, means coupling said comb filter to said record driver means for recording the luminance signal on one portion of the RF spectrum of the record medium, means coupling said comb filter to said record driver means for recording the chroma signal on another portion of the RF spectrum of the record medium separate from said one portion, and a playback signal processing circuit coupled to said video recorder comprising means for recombining the luminance signal from the one portion of the RF spectrum of the record medium with the chroma signal from the other portion of the RF spectrum of the record medium to produce a reconstituted video output signal.
Claim 3
Dependent Claim
53 words
A video recording system as claimed in claim 1 wherein said means for recording the luminance signal operates to record said signal on the higher frequency portion of said RF spectrum and said means for recording the chroma signal operates to record said signal on the lower frequency portion of said RF spectrum.
Claim 4
Dependent Claim
66 words
A video recording system as claimed in claim 2 wherein said means for recording said chroma signal comprises a transcode circuit for changing the frequency band and color coding of said chroma signal, and said recombining means comprises a low pass filter and a transcode circuit for reconverting said recorded low frequency RF chroma signal to its original form for recombining with the playback luminance signal.
Claim 5
Dependent Claim
47 words
A color video recording system as claimed in claim 3 wherein said transcode circuit in said recording means comprises a quadrature modulation circuit for producing a quadrature modulation signal output to said record driver and said transcode circuit in said recombining means comprises a quadrature demodulation circuit.
Claim 6
Dependent Claim
33 words
A color video recording system as claimed in claim 4 wherein the subcarrier of the recorded chroma signal is equal to an odd number of a quarter of the horizontal scanning line frequency.
Claim 7
Dependent Claim
38 words
A color video recording system as claimed in claim 3 wherein said transcode circuit in said recording means comprises a line sequential modulation circuit and said transcode circuit in said recombining means comprises a line sequential demodulation circuit.
Claim 8
Dependent Claim
18 words
A color video recording system as claimed in claim 6 wherein said line sequential modulation is FM modulation.
Claim 9
Dependent Claim
32 words
A color video recording system as claimed in claim 1 wherein said means for recording said chroma signal comprises a heterodyne frequency transposition circuit for transposing the frequency of said chroma signal.
Claim 10
Dependent Claim
113 words
Apparatus for processing an incoming color video signal for recording on the magnetic medium of a video recorder, said video recorder including a record driver means, comprising a comb filter for separating the chroma signal and the luminance signal, circuit means coupling said comb filter to said record driver to transmit said luminance signal to said recorder for recording on one portion of the RF spectrum of the record medium, and a transcoding circuit coupling said comb filter to said record driver for changing the frequency band and the color coding of said chroma signal, said transcoded chroma signal being transmitted to said recorder for recording on another portion of the RF spectrum.
Claim 11
Dependent Claim
113 words
Apparatus for processing an incoming color video signal for recording on the magnetic medium of a video recorder, said video recorder including a record driver means, comprising a comb filter for separating the chroma signal and the luminance signal, circuit means coupling said comb filter to said record driver to transmit said luminance signal to said recorder for recording on one portion of the RF spectrum of the record medium, and a transcoding circuit coupling said comb filter to said record driver for changing the frequency band and the color coding of said chroma signal, said transcoded chroma signal being transmitted to said recorder for recording on another portion of the RF spectrum.
Claim 12
Dependent Claim
89 words
The apparatus of claim 9 including means for playing back said recorded luminance and chroma signals from said record medium comprising means for recombining the luminance signal from the one portion of the RF spectrum of the record medium with the chroma signal from the other portion of the RF spectrum to produce a reconstituted video output signal, said recombining means including a low pass filter and a transcode circuit for reconverting said recorded RF chroma signal to its original form for recombining with the play back luminance signal.
Claim 13
Independent Claim
113 words
The method of recording color video signals on the magnetic medium of a video recorder and playing back said video signals therefrom comprising the steps of comb filtering the incoming video sigNal to separate the chroma signal from the luminance signal, recording the luminance signal on one portion of the RF spectrum of the recorder medium, recording the chroma signal on the other portion of the RF spectrum of the recorder medium, and thereafter recombining the luminance signal from the one portion of the RF spectrum of the recorder medium with the chroma signal from the other portion of the RF spectrum of the recorder medium to produce a reconstituted video output signal.
Claim 14
Independent Claim
113 words
The method of recording color video signals on the magnetic medium of a video recorder and playing back said video signals therefrom comprising the steps of comb filtering the incoming video sigNal to separate the chroma signal from the luminance signal, recording the luminance signal on one portion of the RF spectrum of the recorder medium, recording the chroma signal on the other portion of the RF spectrum of the recorder medium, and thereafter recombining the luminance signal from the one portion of the RF spectrum of the recorder medium with the chroma signal from the other portion of the RF spectrum of the recorder medium to produce a reconstituted video output signal.
Claim 15
Dependent Claim
46 words
The method as claimed in claim 11 wherein the step of recording said chroma signal on the one portion of said RF spectrum comprises the step of transcoding the incoming separated chroma signal to change the frequency band and the color coding of said chroma signal.
Claim 16
Dependent Claim
19 words
The method as claimed in claim 12 wherein said step of transcoding comprises quadrature modulation of said chroma signal.
Claim 17
Dependent Claim
37 words
The method as claimed in claim 13 wherein the step of transcoding comprises changing the subcarrier of the chroma signal to a frequency equal to an odd multiple of a quarter of the horizontal scanning line frequency.
Claim 18
Dependent Claim
20 words
The method as claimed in claim 12 wherein the step of transcoding comprises line sequential modulation of said chroma signal.
Claim 19
Dependent Claim
24 words
A color video system as claimed in claim 1 wherein the incoming video signal and the video output signal are in the NTSC form.
Claim 20
Dependent Claim
24 words
A color video system, as claimed in claim 1 wherein the incoming video signal and the video output signal are in the PAL form.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |