Patent US3564127A successfully refreshed from Google Patents.
US3564127A
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US
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System of band compression for video signals
Assignee: Westinghouse Electric Corp
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Filing: 1968-03-08
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Granted: 1971-02-16
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Expires: 1988-03-08
Abstract
Abstract This invention relates to a method and system for bandcompressing video signals including a continuous storage medium such as a magnetic disc or drum and a sampling circuit for variously reading or writing selected samples to and from the continuous storage medium. In converting a typical horizontally swept, fast-scan video signal to a slow-scan signal, the fastscan video signal corresponding to an image is recorded upon the storage medium and is repeatedly played back while the sampling circuit samples elements of the signal corresponding to one element from each of the horizontal lines so that the resulting slow-scan, distributed signal appears as if the image were vertically scanned. In order to convert the slow-scan signal into a fast-scan signal, the distributed, slow-scan signals are selected by a sampling circuit and recorded onto a continuous storage medium during many revolutions of the storage medium until the entire fast-scan signal has been built-up in a manner that the recorded signal may be played back rapidly to provide a normal horizontal, fast-scan video signal.
Inventors
- 👤 George C Sziklai
- 👤 George F Newell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:12
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N7/122; H04N7/125
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
297 words
A bandwidth conversion system including: means for storing a video signal comprised of a first set of lines made up of a plurality of elements; said means for storiNg including a continuous loop storage medium and means for continuously recycling said storage medium; said storage medium including a first track for storing said video signal, a second and a third track for respectively storing a first clock waveform indicative of the period of said lines of said first set and a second clock waveform indicative of the period of recycling of said medium; means for repeatedly reproducing said video signal; means for sampling said video signal as derived from said means for storing for different replays of said video signal to provide a sampled signal wherein the consecutive elements of said sampled signal are derived from different lines of said first set to thereby form a second set of lines forming said image; a first integration circuit for providing in response to said first clock waveform a first output signal taking the form of a plurality of ramps of a period equal to the period of said lines of said first set; a second integration circuit for providing in response to said second clock waveform a second output signal taking the form of a series of ramps having a period equal to the period of revolution of said storage medium; and a flip-flop circuit to which said first and second output signals are applied, said flip-flop circuit providing an output signal which is applied to said means for sampling for the activation thereof at intervals equal to the period of said lines of said first set and to delay activation of said means for sampling between successive recyclings of said storage medium by one of said elements.
Claim 2
Dependent Claim
297 words
A bandwidth conversion system including: means for storing a video signal comprised of a first set of lines made up of a plurality of elements; said means for storiNg including a continuous loop storage medium and means for continuously recycling said storage medium; said storage medium including a first track for storing said video signal, a second and a third track for respectively storing a first clock waveform indicative of the period of said lines of said first set and a second clock waveform indicative of the period of recycling of said medium; means for repeatedly reproducing said video signal; means for sampling said video signal as derived from said means for storing for different replays of said video signal to provide a sampled signal wherein the consecutive elements of said sampled signal are derived from different lines of said first set to thereby form a second set of lines forming said image; a first integration circuit for providing in response to said first clock waveform a first output signal taking the form of a plurality of ramps of a period equal to the period of said lines of said first set; a second integration circuit for providing in response to said second clock waveform a second output signal taking the form of a series of ramps having a period equal to the period of revolution of said storage medium; and a flip-flop circuit to which said first and second output signals are applied, said flip-flop circuit providing an output signal which is applied to said means for sampling for the activation thereof at intervals equal to the period of said lines of said first set and to delay activation of said means for sampling between successive recyclings of said storage medium by one of said elements.
Claim 3
Dependent Claim
43 words
The bandwidth conversion system of claim 1 includes: means for resetting said first integration circuit at a period equal to said lines of said first set; and means for resetting said second integration circuit after a period corresponding to that of said image.
Claim 4
Dependent Claim
169 words
A bandwidth conversion system including: means for storing a video signal comprising a first set of lines made up of a plurality of elements; said means for storing including a continuous loop storage medium and means for continuously recycling said storage medium; said storage medium including a first track for storing said video signal, a second track for storing a clock waveform having a number of cycles less than the number of elements of said video signal; means for repeatedly reproducing said video signal; means for sampling said video signal as derived from said means for storing for different replays of said video signal to provide a sampled signal wherein the consecutive elements of said sampled signal are derived from different lines of said first set to thereby form a second set of lines forming said image; and means for applying said clock signal to said means for sampling to thereby provide the delay in the timing of said means for sampling between successive recyclings of said storage medium.
Claim 5
Dependent Claim
169 words
A bandwidth conversion system including: means for storing a video signal comprising a first set of lines made up of a plurality of elements; said means for storing including a continuous loop storage medium and means for continuously recycling said storage medium; said storage medium including a first track for storing said video signal, a second track for storing a clock waveform having a number of cycles less than the number of elements of said video signal; means for repeatedly reproducing said video signal; means for sampling said video signal as derived from said means for storing for different replays of said video signal to provide a sampled signal wherein the consecutive elements of said sampled signal are derived from different lines of said first set to thereby form a second set of lines forming said image; and means for applying said clock signal to said means for sampling to thereby provide the delay in the timing of said means for sampling between successive recyclings of said storage medium.
Claim 6
Dependent Claim
55 words
The bandwidth conversion system of claim 3 wherein: said clock waveform contains one cycle less than the number of elements of said video signal; and said means for applying divides said clock waveform by a factor equal to the number of revolutions of said storage medium that is required to build up said video signal.
Claim 7
Dependent Claim
36 words
The bandwidth conversion system of claim 3 wherein said clock waveform has more than one cycle less than the pulses of said video signal to thereby provide a reduction of the resolution of said video signal.
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |