US4218705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delay compensator for a television signal
Assignee: NEC Corp
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Filing: 1978-09-01
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Granted: 1980-08-19
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Expires: 1998-09-01
Abstract
Abstract Delay compensation apparatus for minimizing the delay differences between a video signal transmitted through a plurality of frame synchronizers, which delay the video signal, and a normally undelayed audio signal, the audio and video signal making up a complete television signal. Combinations of discreet delay intervals are imposed on the audio signal such that delay differences between the audio and video signal are minimized to the extent that the negligible remaining delay difference does not degrade the reproduced television picture.
Inventors
- 👤 Masao Inaba
- 👤 Atsumi Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:05
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/02; H04H20/06; H04N; H04N5/00; H04N5/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
A delay compensator for a video signal component of a television signal transmitted through a video transmission path, the video signal being separate in part from an audio transmission path for an audio signal component of said television signal, said video transmission path comprising a plurality of frame synchronizers connected in series, each of said frame synchronizers comprising memory means having the capacity for temporarily delaying one field period of said video signal, said video signal being written in and read out of said memory means of each of said frame synchronizers, said system comprising; delay means provided on said audio transmission path for delaying said audio signal by a period equal to a multiple m of one half of one field period, m being an integer, and means for selecting said integer m in order to substantially equalize the audio signal delay caused by said delay means to one half of the maximum of predetermined total video signal delay caused by said plurality of frame synchronizers.
Claim 2
Dependent Claim
167 words
A delay compensator for a video signal component of a television signal transmitted through a video transmission path, the video signal being separate in part from an audio transmission path for an audio signal component of said television signal, said video transmission path comprising a plurality of frame synchronizers connected in series, each of said frame synchronizers comprising memory means having the capacity for temporarily delaying one field period of said video signal, said video signal being written in and read out of said memory means of each of said frame synchronizers, said system comprising; delay means provided on said audio transmission path for delaying said audio signal by a period equal to a multiple m of one half of one field period, m being an integer, and means for selecting said integer m in order to substantially equalize the audio signal delay caused by said delay means to one half of the maximum of predetermined total video signal delay caused by said plurality of frame synchronizers.
Claim 3
Dependent Claim
41 words
A delay compensator in accordance with claim 1 wherein said delay means includes a plurality of series-connected delay lines, each of said delay lines having a delay period equal to one half of one field period multiplied by the integer m.
Claim 4
Dependent Claim
26 words
A delay compensator in accordance with claim 2 wherein said selecting means includes means for selectively connecting and disconnecting individual one of said series-connected delay lines.
References Cited (Backward Citations)
US4134131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |