Patent US3706843A successfully refreshed from Google Patents.
US3706843A
Expired / Lapsed
US
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Narrow-bandwidth television system
Assignee: Zenith Electronics LLC
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Filing: 1969-10-29
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Granted: 1972-12-19
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Expires: 1989-10-29
Abstract
Abstract A television system for transmitting a video signal on a narrowbandwidth bases. A driven sampling-rate generator is responsive to the video signal for developing a control signal having a frequency equal to a non-integral factor times the line rate of the video signal. A sampling circuit is responsive to the control signal for producing a narrow-bandwidth transmission signal. A second sampling circuit located at the receiver derives a representative video signal from the narrow-bandwidth signal and synchronizes the representative signal with the control signal.
Inventors
- 👤 Leonard J Laub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:58
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N7/122; H04N7/125
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A television system for narrow-bandwidth transmission from a source to a receiver of a video signal having a plurality of picture lines per picture frame and said lines occurring at a pre-established line rate, comprising: means, including a comb filter coupled to said source and having its narrow passbands respectively centered about said line rate and the harmonics thereof, for selectively filtering narrow bands of signals throughout the frequency spectrum of said video signal; means, includIng a driven sampling-rate generator responsive to said video signal, for developing a control signal having a frequency equal to a non-integral factor times said line rate; impulse modulation means, including a first sampling circuit, responsive to said control signal for producing a narrowbandwidth transmission signal embodying a portion of said video signal; means for transmitting said narrow-bandwidth transmission signal to said receiver; and receiver means, including a second sampling circuit having a sampling rate identical to said first sampling circuit, for deriving a reconstituted video signal from said transmission signal.
Claim 2
Dependent Claim
166 words
A television system for narrow-bandwidth transmission from a source to a receiver of a video signal having a plurality of picture lines per picture frame and said lines occurring at a pre-established line rate, comprising: means, including a comb filter coupled to said source and having its narrow passbands respectively centered about said line rate and the harmonics thereof, for selectively filtering narrow bands of signals throughout the frequency spectrum of said video signal; means, includIng a driven sampling-rate generator responsive to said video signal, for developing a control signal having a frequency equal to a non-integral factor times said line rate; impulse modulation means, including a first sampling circuit, responsive to said control signal for producing a narrowbandwidth transmission signal embodying a portion of said video signal; means for transmitting said narrow-bandwidth transmission signal to said receiver; and receiver means, including a second sampling circuit having a sampling rate identical to said first sampling circuit, for deriving a reconstituted video signal from said transmission signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |