US4839744A
Expired / Lapsed
US
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Video signal recording method and associated recording/reproducing apparatus
Assignee: Japan Broadcasting Corp
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Filing: 1987-08-28
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Granted: 1989-06-13
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Expires: 2007-08-28
Abstract
Abstract Disclosed is a video signal recording system, in which the input video signal is rid of unneeded portions, transformed on the time axis and divided into n channels so that they are recorded in a bandwidth narrower than 1/n of original one. The system also enhances the latitude in choosing a clock frequency for time-axis conversion and a track width, thereby optimizing the picture quality and recording time length on a trade-off basis.
Inventors
- 👤 Seishi Sasaki
- 👤 Shigeru Awamoto
- 👤 Tatsushi Bannai
- 👤 Katsuya Yokoyama
- 👤 Hiromichi Shibaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:26
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N9/00; H04N9/79; H04N9/797; H04N9/7973
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A video signal recording method, comprising: (a) removing M scanning lines from N scanning lines per frame of an input video signal to obtain a reduced signal, where M and N are each a positive integer, (b) producing a time-axis expanded luminance signal, a time-axis compressed chrominance signal and a sync signal based on said reduced signal obtained by step (a), and a performed a time-axis multiplex operation on the three signals to produce sets of horizontally integral signals divided into n channels, where n is an integer greater than or equal to one, and (c) dividing the horizontally integral signals provided by step (b) into L segments for each field and recording the segmented signals sequentially in L time scanning operations on a magnetic tape, where L is an integer greater than or equal to one.
Claim 2
Dependent Claim
137 words
A video signal recording method, comprising: (a) removing M scanning lines from N scanning lines per frame of an input video signal to obtain a reduced signal, where M and N are each a positive integer, (b) producing a time-axis expanded luminance signal, a time-axis compressed chrominance signal and a sync signal based on said reduced signal obtained by step (a), and a performed a time-axis multiplex operation on the three signals to produce sets of horizontally integral signals divided into n channels, where n is an integer greater than or equal to one, and (c) dividing the horizontally integral signals provided by step (b) into L segments for each field and recording the segmented signals sequentially in L time scanning operations on a magnetic tape, where L is an integer greater than or equal to one.
Claim 3
Dependent Claim
54 words
A video signal recording method according to claim 1, wherein step (c) comprises recording the segmented signals by making a length of the horizontally integral signals different at a time of head switching from a length thereof at other times so that the recording signals have a periodic characteristic over a plurality of frames
Claim 4
Dependent Claim
52 words
A video signal recording method according to claim 1, wherein step (c) comprises recording the segmented signals by time-axis shifting them by a predetermined distance each segment so that horizontal sync signals of the recorded signals on adjacent tracks align spatially with each other normal to a lengthwise direction of the tracks.
Claim 5
Dependent Claim
161 words
A video signal recording/reproducing apparatus, comprising: a circuit for producing a resultant video signal having N-M scanning lines by removing M scanning lines from N scanning lines per one frame of an input video signal to produce a reduced signal, where M and N are each positive integer, a circuit for producing time-axis expanded signals divided into n channels and time-axis expanded approximately nN/(N-M) times based on said resultant signal, where n is an integer greater than or equal to one, a circuit for dividing said time-axis expanded signals into L segments for each field, where L is an integer greater than or equal to one, and a circuit for time-axis shifting each segment of the divided signals so that horizontal sync signals of the recorded signals on adjacent tracks of a magnetic tape align spatially with each other normal to a lengthwise direction of the tracks, wherein the time-shifted signals are recorded on a magnetic tape as segmented recording tracks.
Claim 6
Dependent Claim
161 words
A video signal recording/reproducing apparatus, comprising: a circuit for producing a resultant video signal having N-M scanning lines by removing M scanning lines from N scanning lines per one frame of an input video signal to produce a reduced signal, where M and N are each positive integer, a circuit for producing time-axis expanded signals divided into n channels and time-axis expanded approximately nN/(N-M) times based on said resultant signal, where n is an integer greater than or equal to one, a circuit for dividing said time-axis expanded signals into L segments for each field, where L is an integer greater than or equal to one, and a circuit for time-axis shifting each segment of the divided signals so that horizontal sync signals of the recorded signals on adjacent tracks of a magnetic tape align spatially with each other normal to a lengthwise direction of the tracks, wherein the time-shifted signals are recorded on a magnetic tape as segmented recording tracks.
References Cited (Backward Citations)
US4630131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |