US4539602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time axis correction device for multiplex information-carrying signal obtained from recording medium
Assignee: Pioneer Video Corp
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Filing: 1982-06-25
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Granted: 1985-09-03
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Expires: 2002-06-25
Abstract
Abstract A time axis correction device for a recording medium player such as a video disc player, which device corrects the time axis of at least one component signal of a plurality of component signals contained in a multiplex information-carrying signal which is picked up from a recording medium, in accordance with an error between a reference signal and a pilot signal separated from the multiplex information-carrying signal, so that the time axis correction operation is performed stably.
Inventors
- 👤 Takashi Okano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:19
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/95
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
A time axis correction device which corrects the time axis of an audio information-carrying component signal contained in a multiplex information-carrying signal which is read from a recording medium and further contains video information-carrying component signal with the standard horizontal synchronous pulse signal, which includes first separating means for separating said audio information-carrying component signal from said multiplex information-carrying signal, second separating means for separating said video information-carrying component signal from said multiplex information signal and for further separating said standard horizontal synchronous pulse signal from said video information-carrying signal, the time axis/correction device comprising: an adder for adding said audio information-carrying signal and said standard synchronous pulse signal; variable delay means for applying a delay to the added audio information-carrying and standard horizontal synchronous pulse signals, said delay being varied in accordance with a control signal; third separating means for separating the horizontal synchronous pulse signal from the added and delayed signals; error detecting means for detecting an amount of error in the time axis between a predetermined reference signal and the horizontal synchronous pulse signal from said third separating means; and control means for producing said control signal representative of the amount of error.
Claim 2
Dependent Claim
196 words
A time axis correction device which corrects the time axis of an audio information-carrying component signal contained in a multiplex information-carrying signal which is read from a recording medium and further contains video information-carrying component signal with the standard horizontal synchronous pulse signal, which includes first separating means for separating said audio information-carrying component signal from said multiplex information-carrying signal, second separating means for separating said video information-carrying component signal from said multiplex information signal and for further separating said standard horizontal synchronous pulse signal from said video information-carrying signal, the time axis/correction device comprising: an adder for adding said audio information-carrying signal and said standard synchronous pulse signal; variable delay means for applying a delay to the added audio information-carrying and standard horizontal synchronous pulse signals, said delay being varied in accordance with a control signal; third separating means for separating the horizontal synchronous pulse signal from the added and delayed signals; error detecting means for detecting an amount of error in the time axis between a predetermined reference signal and the horizontal synchronous pulse signal from said third separating means; and control means for producing said control signal representative of the amount of error.
Claim 3
Dependent Claim
22 words
A time axis correction device as set forth in claim 1, in which said variable delay means is a charge coupled device.
Claim 4
Dependent Claim
46 words
A time axis correction device as set forth in claim 2, in which said error detecting means is a phase detector for producing a voltage proportional to difference in phase between the predetermined reference signal and the horizontal synchronous pulse signal from said third separating means.
Claim 5
Dependent Claim
67 words
A time axis correction device as set forth in claim 3, in which said control means includes a low pass filter for passing therethrough the voltage from said phase detector while eliminating high frequency components contained in the voltage from said phase detector, and a voltage controlled oscillating means for producing a frequency signal having a frequency varying in accordance with the voltage from said phase detector.
Claim 6
Dependent Claim
57 words
A time axis correction device as set forth in claim 1, in which said third separating means includes a band pass filter for passing therethrough the horizontal synchronous pulse signal and a noise eliminator for passing therethrough the horizontal synchronous pulse signal from said band pass filter while eliminating noises contained in the horizontal synchronous pulse 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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |