US4429334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recording and reproducing a digital color video signal
Assignee: Sony Corp
•
Filing: 1980-10-07
•
Granted: 1984-01-31
•
Expires: 2000-10-07
Abstract
Abstract A method for recording a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape includes the steps of sampling the video signal at a frequency which is at least three times the color sub-carrier frequency of the color video signal, converting the sampled video signal into digital form, and recording respective pluralities of the digitized samples which are arranged in a predetermined sequence sequentially in the plurality of parallel tracks, by either recording respective pluralities of contiguous digitized samples sequentially in the tracks, in which each plurality corresponds to at least one cycle of the color sub-carrier, or by alternately separating contiguous ones of the digitized samples into first and second blocks and recording respective pluralities of successive digitized samples of the first and second blocks sequentially in the tracks with the sampling frequency being equal to four times the color sub-carrier frequency, such that the chrominance component of the digital color video signal can be separated during reproduction so as to correct any error in the phase of the color sub-carrier, and such that with the first embodiment of the last-mentioned step, a digital filter having a chrominance characteristic C=(1-Z -2)/2 can be used, and with the method according to the second embodiment, a fourth order digital filter having a chrominance characteristic C=(-1=2Z-2-Z-4)/2 can be used to reproduce the chrominance component, where Z is a delay transfer characteristic of the respective filters.
Inventors
- 👤 Yoshitaka Hashimoto
- 👤 Norihisa Shirota
- 👤 Kaichi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:33
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/808; H04N9/87; H04N9/873; H04N9/877
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
119 words
A method of recording a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said method comprising the steps of: sampling said color video signal at a frequency which is four times the color sub-carrier frequency of the color video signal; converting the sampled color video signal into digitized form; alternately separating consecutive ones of the digitized samples into a first odd block and a second even block; and recording respective groupings of successive digitized samples from said first odd block in alternate ones of said plurality of parallel tracks and respective groupings of successive digitized samples from said second even block in the remaining alternate ones of said plurality of parallel tracks.
Claim 2
Independent Claim
119 words
A method of recording a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said method comprising the steps of: sampling said color video signal at a frequency which is four times the color sub-carrier frequency of the color video signal; converting the sampled color video signal into digitized form; alternately separating consecutive ones of the digitized samples into a first odd block and a second even block; and recording respective groupings of successive digitized samples from said first odd block in alternate ones of said plurality of parallel tracks and respective groupings of successive digitized samples from said second even block in the remaining alternate ones of said plurality of parallel tracks.
Claim 3
Independent Claim
187 words
A method of recording and reproducing a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said color video signal including a chrominance component and a luminance component, said method comprising the steps of: recording said color video signal in said plurality of parallel tracks, including the steps of: sampling said color video signal at a frequency which is at least three times the color sub-carrier frequency of the color video signal; converting the sampled color video signal into digitized form; and recording respective pluralities of continguous ones of the digitized samples which are arranged in a predetermined sequence sequentially in said plurality of parallel tracks, with each plurality of contiguous ones of the digitized samples corresponding to at least one cycle of the color sub-carrier of said color video signal; reproducing said color video signal from said plurality of parallel tracks, including the step of: separating the chrominance component of the reproducing sampled digitized signal in each track by filter means having a chrominance filter characteristic C=(1-Z -2 )/2, where Z is a delay transfer characteristic of the filter means.
Claim 4
Independent Claim
187 words
A method of recording and reproducing a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said color video signal including a chrominance component and a luminance component, said method comprising the steps of: recording said color video signal in said plurality of parallel tracks, including the steps of: sampling said color video signal at a frequency which is at least three times the color sub-carrier frequency of the color video signal; converting the sampled color video signal into digitized form; and recording respective pluralities of continguous ones of the digitized samples which are arranged in a predetermined sequence sequentially in said plurality of parallel tracks, with each plurality of contiguous ones of the digitized samples corresponding to at least one cycle of the color sub-carrier of said color video signal; reproducing said color video signal from said plurality of parallel tracks, including the step of: separating the chrominance component of the reproducing sampled digitized signal in each track by filter means having a chrominance filter characteristic C=(1-Z -2 )/2, where Z is a delay transfer characteristic of the filter means.
Claim 5
Dependent Claim
36 words
The method according to claim 2; in which the step of reproducing said color video signal includes the step of correcting any error in the phase of the color subcarrier of the reproduced color video signal.
Claim 6
Dependent Claim
64 words
The method according to claim 3; in which said step of correcting any error includes the steps of comparing the phase of the color sub-carrier of the separated chrominance component with a reference phase and producing an output in response to such comparison, and correcting any error in the phase of the color sub-carrier of the separated chrominance component in response to said output.
Claim 7
Independent Claim
172 words
A method of recording and reproducing a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said color video signal including a chrominance component and a luminance component, said method comprising the steps of: recording said color video signal in said plurality of parallel tracks, including the steps of: sampling said color video signal at a frequency which is four times the color sub-carrier frequency of the color video signal; converting the sampled color video signal into digitized form; alternately separating contiguous ones of the digitized samples into first and second blocks; and recording respective pluralities of successive digitized samples of said first and second blocks sequentially in said plurality of parallel tracks; and reproducing said color video signal from said plurality of parallel tracks, including the step of: separating the chrominance component of the reproduced sampled digitized signal in each track by filter means having a chrominance filter characteristic C=1/4(-1+2Z -2 -Z 4 ), where Z is a delay transfer characteristic of the filter means.
Claim 8
Independent Claim
172 words
A method of recording and reproducing a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said color video signal including a chrominance component and a luminance component, said method comprising the steps of: recording said color video signal in said plurality of parallel tracks, including the steps of: sampling said color video signal at a frequency which is four times the color sub-carrier frequency of the color video signal; converting the sampled color video signal into digitized form; alternately separating contiguous ones of the digitized samples into first and second blocks; and recording respective pluralities of successive digitized samples of said first and second blocks sequentially in said plurality of parallel tracks; and reproducing said color video signal from said plurality of parallel tracks, including the step of: separating the chrominance component of the reproduced sampled digitized signal in each track by filter means having a chrominance filter characteristic C=1/4(-1+2Z -2 -Z 4 ), where Z is a delay transfer characteristic of the filter means.
Claim 9
Dependent Claim
121 words
Apparatus for recording a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, comprising: means for sampling said color video signal at a frequency which is four times the color sub-carrier frequency of the color video signal and for converting the sampled color video signal into digitized form; and means for alternately separating consecutive ones of the digitized samples into a first odd block and a second even block and for recording respective groupings of successive digitized samples from said first odd block in alternate ones of said plurality of parallel tracks and respective groupings of successive digitized samples from said second even block in the remaining alternate ones of said plurality of parallel tracks.
Claim 10
Dependent Claim
121 words
Apparatus for recording a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, comprising: means for sampling said color video signal at a frequency which is four times the color sub-carrier frequency of the color video signal and for converting the sampled color video signal into digitized form; and means for alternately separating consecutive ones of the digitized samples into a first odd block and a second even block and for recording respective groupings of successive digitized samples from said first odd block in alternate ones of said plurality of parallel tracks and respective groupings of successive digitized samples from said second even block in the remaining alternate ones of said plurality of parallel tracks.
Claim 11
Dependent Claim
214 words
Apparatus for recording and reproducing a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said color video signal including a chrominance component and a luminance component, said apparatus comprising: a recording section for recording said color video signal in said plurality of parallel tracks, including: means for sampling said color video signal at a frequency which is at least three times the color sub-carrier frequency of the color video signal and for converting the sampled color video signal into digital form; and means for recording respective pluralities of the digitized samples which are arranged in a predetermined sequence sequentially in said plurality of parallel tracks, in which said digitized samples in each plurality of digitized samples are arranged in a contiguous manner, with each plurality of contiguous digitized samples corresponding to at least one cycle of the color sub-carrier of said color video signal; and a reproducing section for reproducing said color video signal from said plurality of parallel tracks, including: filter means for separating the chrominance component of the reproduced sampled digital signal in each track and having a delay transfer characteristic; in which said filter means has a chrominance filter characteristic C=(1-Z -2 )/2, where Z is the delay transfer characteristic of the filter means.
Claim 12
Dependent Claim
214 words
Apparatus for recording and reproducing a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said color video signal including a chrominance component and a luminance component, said apparatus comprising: a recording section for recording said color video signal in said plurality of parallel tracks, including: means for sampling said color video signal at a frequency which is at least three times the color sub-carrier frequency of the color video signal and for converting the sampled color video signal into digital form; and means for recording respective pluralities of the digitized samples which are arranged in a predetermined sequence sequentially in said plurality of parallel tracks, in which said digitized samples in each plurality of digitized samples are arranged in a contiguous manner, with each plurality of contiguous digitized samples corresponding to at least one cycle of the color sub-carrier of said color video signal; and a reproducing section for reproducing said color video signal from said plurality of parallel tracks, including: filter means for separating the chrominance component of the reproduced sampled digital signal in each track and having a delay transfer characteristic; in which said filter means has a chrominance filter characteristic C=(1-Z -2 )/2, where Z is the delay transfer characteristic of the filter means.
Claim 13
Dependent Claim
84 words
Apparatus according to claim 7; in which said filter means includes an input receiving said contiguous digitized samples of each plurality from said plurality of tracks; sample delay means for delaying the contiguous samples from said input by a period of two samples; means for subtracting the contiguous samples at the input from said delayed contiguous samples from the sample delay means and producing an output therefrom; and dividing means for dividing said output by two so as to produce the separated chrominance component.
Claim 14
Dependent Claim
31 words
Apparatus according to claim 7; in which said reproducing section further includes phase correcting means for correcting any error in the phase of the color sub-carrier of the separated chrominance component.
Claim 15
Dependent Claim
70 words
Apparatus according to claim 9; in which said phase correcting means includes phase comparator means for comparing the phase of the color sub-carrier of the separated chrominance component with a reference phase and for producing an output in response thereto, and phase compensating means for correcting any error in the phase of the color sub-carrier of the separated chrominance component in response to the output from said phase comparator means.
Claim 16
Dependent Claim
179 words
Apparatus for recording and reproducing a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said color video signal including a chrominance component and a luminance component, said apparatus comprising: a recording section for recording said color video signal in said plurality of parallel tracks, including: means for sampling said color video signal at a frequency which is four times the color sub-carrier frequency of the color video signal and for converting the sampled color video signal into digital form; and means for alternately separating contiguous ones of the digitized samples into first and second blocks and for recording respective pluralities of successive digitized samples of said first and second blocks sequentially in said plurality of parallel tracks; and a reproducing section for reproducing said color video signal from said plurality of parallel tracks, including: filter means for separating the chrominance component of the reproduced sampled digital signal in each track and having a chrominance filter characteristic C=1/4(-1+2Z -2 -Z -4 ), where Z is a delay transfer characteristic of the filter means.
Claim 17
Dependent Claim
179 words
Apparatus for recording and reproducing a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape, said color video signal including a chrominance component and a luminance component, said apparatus comprising: a recording section for recording said color video signal in said plurality of parallel tracks, including: means for sampling said color video signal at a frequency which is four times the color sub-carrier frequency of the color video signal and for converting the sampled color video signal into digital form; and means for alternately separating contiguous ones of the digitized samples into first and second blocks and for recording respective pluralities of successive digitized samples of said first and second blocks sequentially in said plurality of parallel tracks; and a reproducing section for reproducing said color video signal from said plurality of parallel tracks, including: filter means for separating the chrominance component of the reproduced sampled digital signal in each track and having a chrominance filter characteristic C=1/4(-1+2Z -2 -Z -4 ), where Z is a delay transfer characteristic of the filter means.
Claim 18
Dependent Claim
130 words
Apparatus according to claim 11; in which said filter means includes an input receiving said contiguous digitized samples of said plurality from said plurality of tracks; first sample delay means for delaying the contiguous samples from said input by a period of two samples; second sample delay means for further delaying by a period of two samples the delayed contiguous samples from said first sample delay means; multiplier means for multiplying the delayed contiguous samples from said first sample delay means by two; means for subtracting the contiguous samples from said input and the delayed samples from said second sample delay means from the delayed samples from said multiplier means; and dividing means for dividing the output of the means for subtracting by four to produce the separated chrominance component.
References Cited (Backward Citations)
US3761611A
Cited
US3921204A
Cited
US3836707A
Cited
US3922669A
Cited
US4084181A
Cited
US4277807A
Cited
US4329708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |