US4737863A
Expired / Lapsed
US
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Method for distributing and recording video signals and an apparatus using the same
Assignee: Hitachi Ltd
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Filing: 1985-07-25
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Granted: 1988-04-12
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Expires: 2005-07-25
Abstract
Abstract Video signal components including the luminance and color signals are sampled using a clock generator and dividers, and the resultant signals are coded through a plurality of channels and are recorded in a video tape recorder. In order to suppress and disperse in the screen image the effect of an error or a dropout occurring in a channel during a recording/playback process, the coded pixels are distributed to each channel so as to uniformly disperse the pixels associated with each component in the screen image. For this purpose, the pixels on a line perpendicular to the scanning lines on the screen are extracted sequentially from a different channel; consequently, even if a failure takes place in a channel, the erroneous pixel can thus be compensated for by use of the correct pixel just above or below the erroneous pixel. The coded pixels are subjected to a bit reversion or complementing to be conducted on every second pixel, and the direct current component of the obtained signals is suppressed, then the resultant signals are recorded on a recording medium.
Inventors
- 👤 Yoshizumi Eto
- 👤 Masuo Umemoto
- 👤 Sinich Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:27
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/87; H04N9/88; H04N9/888; H04N9/80; H04N9/804
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
172 words
An apparatus for effecting a digital recording of video signal information in the form of luminance video-signal components and chrominance video-signal components on a recording medium via a plurality of recording channels for pixels arranged in scanning lines for a video display, comprising: (a) means for performing an analog-to-digital conversion to convert said luminance and chrominance video-signal components into a plurality of representative pixel codes each having a plurality of bits; (b) means for distributing luminance pixel codes on a scanning line to the recording channels so that every M th pixel code in either horizontal or vertical direction is distributed to the same channel, wherein M represents the number of recording channels; (c) means for distributing respective chrominance pixel codes, which corresponds to the same pixel to which respective luminance pixel codes are associated, to different recording channels from those luminance pixel codes consisting of the same pixel; and (d) means for recording said plurality of distributed pixel codes on said recording medium in parallel via said plurality of recording channels.
Claim 2
Independent Claim
172 words
An apparatus for effecting a digital recording of video signal information in the form of luminance video-signal components and chrominance video-signal components on a recording medium via a plurality of recording channels for pixels arranged in scanning lines for a video display, comprising: (a) means for performing an analog-to-digital conversion to convert said luminance and chrominance video-signal components into a plurality of representative pixel codes each having a plurality of bits; (b) means for distributing luminance pixel codes on a scanning line to the recording channels so that every M th pixel code in either horizontal or vertical direction is distributed to the same channel, wherein M represents the number of recording channels; (c) means for distributing respective chrominance pixel codes, which corresponds to the same pixel to which respective luminance pixel codes are associated, to different recording channels from those luminance pixel codes consisting of the same pixel; and (d) means for recording said plurality of distributed pixel codes on said recording medium in parallel via said plurality of recording channels.
Claim 3
Dependent Claim
68 words
An apparatus for effecting a digital recording of a plurality of video-signal components according to claim 1, wherein said distributing means furthermore distributes said pixel codes, corresponding to said luminance and chrominance video-signal components of a next scanning line adjacent to a scanning line in said video display, to a recording channel different from a recording channel corresponding to a pixel code in said latter mentioned scanning line.
Claim 4
Dependent Claim
76 words
An apparatus for effecting a digital recording of a plurality of video signal components according to claim 1, wherein said distributing means distributing said pixel codes, corresponding to said luminance and chrominance video-signal components of a scanning line in said video display, to a recording channel different from the recording channels corresponding to the immediately above positioned pixels of a preceding scanning line by a number of scanning lines fewer than the number of said channels.
Claim 5
Dependent Claim
81 words
An apparatus for effecting a digital recording of a plurality of video signal components according to claim 1, further comprising means connected to an output of said distributing means for effecting bit complementing on a pixel code bit for every second pixel code of consecutive pixels on a scanning line to thereby suppress a direct current component of the pixel code, wherein said distributing means performs distribution of said pixel codes in units of two consecutive pixels on said scanning lines.
Claim 6
Dependent Claim
166 words
An apparatus for effecting a digital recording of a plurality of video-signal components according to claim 3, wherein said video-signal components are comprised of a first and second chrominance signals (I, Q) and a luminance signal (Y) and said analog-to-digital conversion means of said digital recording apparatus further comprises: (a) a first frequency divider for inputting a clock signal and for dividing said clock signal to generate a signal for sampling said luminance signal, (b) a second frequency divider for inputting said clock signal and for dividing said clock signal in accordance with a ratio N, corresponding to a positive integer, obtained by dividing a sampling frequency of said luminance signal by a sampling frequency of said first and second chrominance signals to thereby obtain a recording/playback signal common to each channel for said pixel codes, and (c) a third divider for inputting said common recording/playback signal and for dividing said common recording/playback signal to generate a sampling signal of said first and second chrominance signals.
Claim 7
Independent Claim
156 words
A method for digitally recording luminance and chrominance video-signal components on a recording medium via a plurality of recording channels for pixels arranged in scanning lines for a video display, comprising the steps of: (a) performing an analog-to-digital conversion to convert said luminance and chrominance video-signal components into a plurality of representative pixel codes each having a plurality of bits, respectively; (b) distributing luminance pixel codes on a scanning line to the recording channels so that every M th luminance pixel code in either horizontal or vertical direction is distributed to the same channel, wherein M represents the number of recording channels; (c) distributing chrominance pixel codes, which correspond to the same pixel to which respective luminance pixel codes are associated, to different recording channels from those luminance pixel codes consisting of the same pixel; and (d) recording said plurality of distributed pixel codes on the recording medium in parallel via said plurality of recording channels.
Claim 8
Independent Claim
156 words
A method for digitally recording luminance and chrominance video-signal components on a recording medium via a plurality of recording channels for pixels arranged in scanning lines for a video display, comprising the steps of: (a) performing an analog-to-digital conversion to convert said luminance and chrominance video-signal components into a plurality of representative pixel codes each having a plurality of bits, respectively; (b) distributing luminance pixel codes on a scanning line to the recording channels so that every M th luminance pixel code in either horizontal or vertical direction is distributed to the same channel, wherein M represents the number of recording channels; (c) distributing chrominance pixel codes, which correspond to the same pixel to which respective luminance pixel codes are associated, to different recording channels from those luminance pixel codes consisting of the same pixel; and (d) recording said plurality of distributed pixel codes on the recording medium in parallel via said plurality of recording channels.
Claim 9
Dependent Claim
70 words
A method for digitally recording luminance and chrominance video-signal components according to claim 6, wherein the step for distributing said pixel codes further comprises distributing said pixel codes, corresponding to said luminance and chrominance video-signal components of a next scanning line adjacent to a scanning line in said video display, to a recording channel different from a recording channel corresponding to a pixel code in said latter mentioned scanning line.
Claim 10
Dependent Claim
77 words
A method for digitally recording luminance and chrominance video-signal components according to claim 6, wherein the step for distributing said pixel codes comprises distributing said pixel codes, corresponding to said luminance and chrominance video-signal components of a scanning line in said video display, to a recording channel different from the recording channels corresponding to the immediately above positioned pixels of a preceding scanning line by a number of scanning lines fewer than the number of said channels.
Claim 11
Dependent Claim
76 words
A method for digitally recording luminance and chrominance video-signal components according to claim 6, further comprising the step of effecting bit complementing on a pixel code bit for every second pixel code of consecutive pixels on a scanning line to thereby suppress a direct current component of the pixel code, wherein the step for distributing said pixel codes includes the step of distributing said pixel codes in units of two consecutive pixels on said scanning line.
Claim 12
Independent Claim
143 words
An apparatus for effecting a digital recording of video signal information in the form of luminance video-signal components and chrominance video-signal components on a recording medium via a plurality of recording channels for pixels arranged in scanning lines for a video display, comprising: (a) means for converting the luminance component and chrominance component of a picture into digital pixel code information; (b) means for distributing the luminance pixel code information on a scanning line to the recording channels so that every Mth pixel code information in either the horizontal or vertical direction in a picture is distributed to the same recording channel, wherein M represents the number of recording channels; and (c) means for distributing respective chrominance pixel code information to the recording channels that are different from the recording channel where the luminance pixel code information of the same pixel is distributed.
Claim 13
Independent Claim
143 words
An apparatus for effecting a digital recording of video signal information in the form of luminance video-signal components and chrominance video-signal components on a recording medium via a plurality of recording channels for pixels arranged in scanning lines for a video display, comprising: (a) means for converting the luminance component and chrominance component of a picture into digital pixel code information; (b) means for distributing the luminance pixel code information on a scanning line to the recording channels so that every Mth pixel code information in either the horizontal or vertical direction in a picture is distributed to the same recording channel, wherein M represents the number of recording channels; and (c) means for distributing respective chrominance pixel code information to the recording channels that are different from the recording channel where the luminance pixel code information of the same pixel is distributed.
Claim 14
Dependent Claim
26 words
An apparatus for effecting a digital recording of video signal information according to claim 10 wherein each pixel code consists of a pair of adjacent pixels.
Claim 15
Independent Claim
155 words
An apparatus for effecting a digital recording of video signal information in the form of luminance video-signal components and chrominance video-signal components on a recording medium via a plurality of recording channels for pixels arranged in scanning lines for a video display, comprising: (a) means for converting the luminance component and chrominance component of a picture into digital pixel code information; (b) means for distributing the luminance pixel code information on a scanning line to the recording channels which are greater than the number of types of pixel code information so that every Mth pixel code information in either the horizontal or vertical direction in a picture is distributed to the same recording channel, wherein M represents the number of recording channels; and (c) means for distributing respective chrominance pixel code information to the recording channels that are different from the recording channel where the luminance pixel code information of the same pixel is distributed.
Claim 16
Independent Claim
155 words
An apparatus for effecting a digital recording of video signal information in the form of luminance video-signal components and chrominance video-signal components on a recording medium via a plurality of recording channels for pixels arranged in scanning lines for a video display, comprising: (a) means for converting the luminance component and chrominance component of a picture into digital pixel code information; (b) means for distributing the luminance pixel code information on a scanning line to the recording channels which are greater than the number of types of pixel code information so that every Mth pixel code information in either the horizontal or vertical direction in a picture is distributed to the same recording channel, wherein M represents the number of recording channels; and (c) means for distributing respective chrominance pixel code information to the recording channels that are different from the recording channel where the luminance pixel code information of the same pixel is distributed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |