US4158855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dropout compensator with proportional duration dropout detector
Assignee: RCA Corp
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Filing: 1977-11-29
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Granted: 1979-06-19
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Expires: 1997-11-29
Abstract
Abstract A signal defect compensator is provided which develops a replacement video signal for use during a signal dropout. The compensator includes a dropout pulse detector for the generation of a stretched dropout control pulse interval proportional to the duration of the signal dropout.
Inventors
- 👤 Robert G. Thomas
- 👤 Koichi Sadashige
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:14
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/94
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A video signal processing system for providing dropout compensation for a video signal comprising: a source of video signals; means responsive to said source of video signals for developing a source of replacement video signals; means responsive to said source of video signals for generating a first signal of a duration equal to said signal dropout; means responsive to said first signal for developing a stretched dropout control signal of a duration equal to said first signal plus a varying stretched duration proportional to the duration of said first signal; and switch means coupled to said source of video signals and to said source of replacement video signals being responsive to said stretched dropout control signal for substituting one of said source of video signals or said replacement video signals for the other in the presence of said stretched dropout signal.
Claim 2
Dependent Claim
141 words
A video signal processing system for providing dropout compensation for a video signal comprising: a source of video signals; means responsive to said source of video signals for developing a source of replacement video signals; means responsive to said source of video signals for generating a first signal of a duration equal to said signal dropout; means responsive to said first signal for developing a stretched dropout control signal of a duration equal to said first signal plus a varying stretched duration proportional to the duration of said first signal; and switch means coupled to said source of video signals and to said source of replacement video signals being responsive to said stretched dropout control signal for substituting one of said source of video signals or said replacement video signals for the other in the presence of said stretched dropout signal.
Claim 3
Dependent Claim
105 words
A video processing system according to claim 1 wherein said means for developing said stretched dropout signal includes; a first multivibrator responsive to said first signal having a first time constant for developing a first output pulse of a first period; a second multivibrator responsive to said first signal having a second time constant for developing a second output pulse of a second period; and means coupling said second output pulse to said first multivibrator for altering the time constant of said first multivibrator so as to stretch the period of said first output pulse in proportion to the period of said second output pulse.
Claim 4
Dependent Claim
40 words
A video processing system according to claim 2 wherein said first multivibrator includes means for further altering said first time constant so as to further stretch the period of said first output pulse in response to an external control signal.
References Cited (Backward Citations)
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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) | 1982-06-18 | 1982-12-18 | 1983-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-18 | 1986-12-18 | 1987-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-18 | 1990-12-18 | 1991-06-19 | $7700.00 | Window Closed / Lapsed |