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US5164838A
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Time base error signal generating apparatus
Assignee: Pioneer Corp
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Filing: 1991-04-18
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Granted: 1992-11-17
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Expires: 2011-04-18
Abstract
Abstract A time base error signal generating apparatus which outputs a phase difference signal representing a phase difference between a horizontal sync signal and a reference signal as a time base error signal. In accordance with the phase status of a vertical sync signal with respect to the reference signal, supply of the horizontal sync signal or reference signal to a phase comparator is inhibited. Therefore, a single, phase comparator can detect the phase difference while avoiding problems such as a phase offset.
Inventors
- 👤 Yoshiyuki Okuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:05
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B19/28; G11B20/00; G11B20/22; G11B20/225; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/932; H04N9/00; H04N9/79; H04N9/87; H04N9/89; H04N9/896
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
212 words
A time base error signal generating apparatus for detecting an error of a time base of a reproduced video signal containing a first playback sync signal of a predetermined period and a second playback sync signal of a longer period than the predetermined period and generating a time base error signal, the apparatus comprising: phase comparing means for detecting a phase difference between the first playback sync signal and a first reference sync signal; detecting means for detecting a status of the phase of the second playback sync signal with respect to a second reference sync signal, and generating a first control signal, in case of an advanced phase, for a period according to the degree of the advancement, and generating a second control signal, in case of a delayed phase, for a period according to the degree of the delay; and gate means for inhibiting supply of the first reference sync signal to the phase comparing means in response to the first control signal for a duration thereof, and inhibiting supply of the first playback sync signal to the phase comparing means in response to the second control signal for a duration thereof, whereby the phase difference signal from the phase comparing means is output as the time base error signal.
Claim 2
Dependent Claim
212 words
A time base error signal generating apparatus for detecting an error of a time base of a reproduced video signal containing a first playback sync signal of a predetermined period and a second playback sync signal of a longer period than the predetermined period and generating a time base error signal, the apparatus comprising: phase comparing means for detecting a phase difference between the first playback sync signal and a first reference sync signal; detecting means for detecting a status of the phase of the second playback sync signal with respect to a second reference sync signal, and generating a first control signal, in case of an advanced phase, for a period according to the degree of the advancement, and generating a second control signal, in case of a delayed phase, for a period according to the degree of the delay; and gate means for inhibiting supply of the first reference sync signal to the phase comparing means in response to the first control signal for a duration thereof, and inhibiting supply of the first playback sync signal to the phase comparing means in response to the second control signal for a duration thereof, whereby the phase difference signal from the phase comparing means is output as the time base error signal.
Claim 3
Dependent Claim
41 words
A time base error signal generating apparatus according to claim 1, wherein the first playback sync signal is a horizontal sync signal or a color burst signal, and the second playback sync signal is vertical sync signal or horizontal sync 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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |