US3697682A
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Video signal processing
Assignee: AT&T Inc
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Filing: 1971-06-11
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Granted: 1972-10-10
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Expires: 1991-06-11
Abstract
Abstract A television picture is scanned such that each frame of the resultant video signal comprises a succession of N interlaced fields. Each field is then delayed by a time equal to the field scan time multiplied by the factor (N-I), where I represents its ordinal place in the succession. The fields, which thus coexist in time, are then interleaved in the frequency domain. The video signal is thereby compressed by a factor of N on a frame-by-frame basis, and additional data can be time multiplexed between the compressed frames. Alternatively, the bandwidth of the signal can be reduced by stretching the time-compressed frames.
Inventors
- 👤 Anthony David Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:26
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/0806; H04N7/0803; H04N7/12; H04N7/127
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
103 words
A method of processing a signal including an ordered succession of N fields each substantially characterized in the frequency domain by a line spectrum having components at harmonics of a common frequency, said method comprising the steps of; frequency shifting individual ones of said fields such that at least one line spectrum component of each of said fields is located at a frequency between the frequency locations of line spectrum components of another of said fields, delaying individual ones of said fields so that all of said fields coexist in time, and additively combining all of said fields to produce an interleaved signal.
Claim 2
Independent Claim
103 words
A method of processing a signal including an ordered succession of N fields each substantially characterized in the frequency domain by a line spectrum having components at harmonics of a common frequency, said method comprising the steps of; frequency shifting individual ones of said fields such that at least one line spectrum component of each of said fields is located at a frequency between the frequency locations of line spectrum components of another of said fields, delaying individual ones of said fields so that all of said fields coexist in time, and additively combining all of said fields to produce an interleaved signal.
Claim 3
Dependent Claim
66 words
A method of processing a signal in accordance with claim 1 further comprising the steps of; distributing signals corresponding to said interleaved signal, frequency shifting individual ones of said distributed signals such that a different one of said fields in each of said distributed signals is in its original frequency domain location, and separating said different one fields of said distributed signals in their original order.
Claim 4
Dependent Claim
35 words
A method of processing a signal in accordance with claim 1 further comprising the step of; time expanding said interleaved signal, whereby the bandwidth of said signal is reduced in proportion to said time expansion.
Claim 5
Independent Claim
131 words
A method of processing a video frame scanned in a succession of N fields of substantially equal duration, said method comprising the steps of; delaying the first field of said frame by a time at least as great as the duration of one of said fields multiplied by the factor N-1, delaying each succeeding field of said frame by a time equal to the delay time of the preceding field less the time duration of one of said fields, so that said fields coexist in time, and frequency interleaving said fields, wherein said frequency interleaving step comprises frequency shifting individual ones of said fields and additively combining said fields such that at least one frequency component of each of said fields is located between frequency components of another of said fields.
Claim 6
Independent Claim
131 words
A method of processing a video frame scanned in a succession of N fields of substantially equal duration, said method comprising the steps of; delaying the first field of said frame by a time at least as great as the duration of one of said fields multiplied by the factor N-1, delaying each succeeding field of said frame by a time equal to the delay time of the preceding field less the time duration of one of said fields, so that said fields coexist in time, and frequency interleaving said fields, wherein said frequency interleaving step comprises frequency shifting individual ones of said fields and additively combining said fields such that at least one frequency component of each of said fields is located between frequency components of another of said fields.
Claim 7
Dependent Claim
152 words
Signal processing apparatus comprising; a signal source providing a series of information frames, each of said frames comprising an ordered succession of N fields of substantially equal duration, the energy of said frames being distributed substantially at harmonics of a common frequency, means for delaying the first field of each of said frames by a time at least as great as the duration of one of said fields multiplied by the factor N-1, means for delaying each successive field of each of said frames by a time equal to the delay time of the preceding field in the frame less the time duration of one of said fields, so that the fields of each frame coexist in time, and means for frequency interleaving the fields of each frame, whereby said signal is compressed in time by a factor of N on a frame-by-frame basis with vacant time intervals between the compressed frames.
Claim 8
Dependent Claim
152 words
Signal processing apparatus comprising; a signal source providing a series of information frames, each of said frames comprising an ordered succession of N fields of substantially equal duration, the energy of said frames being distributed substantially at harmonics of a common frequency, means for delaying the first field of each of said frames by a time at least as great as the duration of one of said fields multiplied by the factor N-1, means for delaying each successive field of each of said frames by a time equal to the delay time of the preceding field in the frame less the time duration of one of said fields, so that the fields of each frame coexist in time, and means for frequency interleaving the fields of each frame, whereby said signal is compressed in time by a factor of N on a frame-by-frame basis with vacant time intervals between the compressed frames.
Claim 9
Dependent Claim
28 words
Signal processing apparatus in accordance with claim 5 further comprising means for time multiplexing one or more additional signals in said vacant time intervals between said compressed frames.
Claim 10
Dependent Claim
33 words
Signal processing apparatus in accordance with claim 5 further comprising means for time-expanding the individual frames of said compressed signal, whereby the bandwidth of said signal is reduced in proportion to said expansion.
Claim 11
Dependent Claim
171 words
A signal transmission system comprising; a signal source providing a series of iNformation frames, each of said frames comprising an ordered succession of N fields of substantially equal duration, the energy of said frames being distributed substantially at harmonics of a common frequency, means for delaying individual ones of said fields in each frame so that all N fields in each frame coexist in time, means for frequency interleaving the N fields of each frame to produce an output signal compressed in time by a factor of N on a frame-by-frame basis with vacant time intervals between the compressed frames, and means for successively reconstructing each frame of said output signal including, means for distributing N signals corresponding to each frame of said output signal, means for frequency shifting individual ones of said N signals to distribute the energy of a different field in each of said N signals substantially at said harmonics of said common frequency, and means for separating said different fields in their original order in their frame.
Claim 12
Dependent Claim
171 words
A signal transmission system comprising; a signal source providing a series of iNformation frames, each of said frames comprising an ordered succession of N fields of substantially equal duration, the energy of said frames being distributed substantially at harmonics of a common frequency, means for delaying individual ones of said fields in each frame so that all N fields in each frame coexist in time, means for frequency interleaving the N fields of each frame to produce an output signal compressed in time by a factor of N on a frame-by-frame basis with vacant time intervals between the compressed frames, and means for successively reconstructing each frame of said output signal including, means for distributing N signals corresponding to each frame of said output signal, means for frequency shifting individual ones of said N signals to distribute the energy of a different field in each of said N signals substantially at said harmonics of said common frequency, and means for separating said different fields in their original order in their frame.
Claim 13
Dependent Claim
64 words
A signal transmission system in accordance with claim 8 wherein said arranging means includes N comb filter means, means for applying said N signals to respective ones of said comb filter means, the output of each of said comb filter means corresponding to a different one of said N fields, and means for ordering said N signals in the order of said N fields.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |