US4788601A
Expired / Lapsed
US
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Video signal reproducing apparatus with H sync discontinuity correction
Assignee: Canon Inc
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Filing: 1986-09-22
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Granted: 1988-11-29
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Expires: 2006-09-22
Abstract
Abstract A video signal reproducing apparatus is provided with delay means for changing to a given degree at a time the phase of a reproduced horizontal synchronizing signal included in a reproduced video signal which is taken out from a recording medium. When the reproduced horizontal synchronizing signal becomes discontinuous, the discontinuous signal is replaced with the output signal of the delay means until the phase of the output signal comes to coincide with the phase of the reproduced horizontal synchronizing signal. The delay means includes a delay line which delays the horizontal synchronizing signal for one horizontal scanning period and a delay circuit which is arranged to further delay for a short period of time the signal delayed and produced from the delay line.
Inventors
- 👤 Somei Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:29
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/932; H04N5/94
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
122 words
A video signal processing device comprising: (a) separating means for receiving said video signal and for separating a horizontal synchronizing signal from said video signal; (b) delay means for receiving and delaying such separated horizontal synchronizing signal, said delay means including (1) a first circuit for delaying said separated horizontal synchronizing signal for one horizontal scanning period and for generating an output signal indicative thereof, and (2) a second circuit for receiving said first circuit output signal and for delaying such received signal for a period of time shorter than one horizontal scanning period and generating an output signal indicative thereof; and (c) output means for furnishing said video signal selectively with said second circuit output signal during a predetermined time period.
Claim 2
Dependent Claim
122 words
A video signal processing device comprising: (a) separating means for receiving said video signal and for separating a horizontal synchronizing signal from said video signal; (b) delay means for receiving and delaying such separated horizontal synchronizing signal, said delay means including (1) a first circuit for delaying said separated horizontal synchronizing signal for one horizontal scanning period and for generating an output signal indicative thereof, and (2) a second circuit for receiving said first circuit output signal and for delaying such received signal for a period of time shorter than one horizontal scanning period and generating an output signal indicative thereof; and (c) output means for furnishing said video signal selectively with said second circuit output signal during a predetermined time period.
Claim 3
Dependent Claim
27 words
A device according to claim 1, wherein said video signal has a vertical blanking period and wherein said predetermined time period corresponds to said vertical blanking period.
Claim 4
Dependent Claim
19 words
A device according to claim 2, further comprising detecting means for detecting the blanking period of said video signal.
Claim 5
Dependent Claim
31 words
A device according to claim 1, wherein said video signal is recorded on a recorded medium, said device further comprising reproducing means for reproducing said video signal from said recording medium.
Claim 6
Dependent Claim
14 words
A device according to claim 4, wherein said recording medium is a disc-shaped medium.
Claim 7
Dependent Claim
36 words
A device according to claim 5, wherein said disc-shaped recording medium has recording tracks formed in a concentric manner, and wherein one field portion of said video signal is recorded in each of said recording tracks.
Claim 8
Dependent Claim
59 words
A video signal processing device comprising: (a) separating means for receiving said video signal and for separating a synchronizing signal from said video signal; (b) delay means for receiving and delaying an incoming signal for a predetermined period; and (c) switching means for selectively supplying said delay means with either said separated synchronizing signal or with said video signal.
Claim 9
Dependent Claim
59 words
A video signal processing device comprising: (a) separating means for receiving said video signal and for separating a synchronizing signal from said video signal; (b) delay means for receiving and delaying an incoming signal for a predetermined period; and (c) switching means for selectively supplying said delay means with either said separated synchronizing signal or with said video signal.
Claim 10
Dependent Claim
27 words
A device according to claim 7, wherein said synchronizing signal is a horizontal synchronizing signal and wherein said predetermined period is longer than one horizontal scanning period.
Claim 11
Dependent Claim
42 words
A device according to claim 7, further comprising: (d) detecting means for detecting that said synchronizing signal is discontinuous, and wherein said detecting means being operative thereupon to cause said switching means to supply said separated synchronizing signal to said delay means.
Claim 12
Dependent Claim
58 words
A device according to claim 9, further comprising: (d) further detecting means for receiving said video signal and for detecting a video drop-out in said video signal; and (e) means for producing as video signal output of said device a prior video signal delayed by said delay means when a drop-out is detected by said further detecting means.
Claim 13
Dependent Claim
33 words
A device according to claim 9, further comprising means for supplying a delayed synchronizing signal delayed by said delay means with said video signal when said synchronizing signal is detected to be discontinuous.
Claim 14
Dependent Claim
63 words
A video signal processing device comprising: (a) separting means for receiving said video signal and for separating a horizontal sychronizing signal from said video signal; (b) delay means for receiving and delaying said separated horizontal synchronizing signal for a predetermined period of time; and (c) means for supplying such delayed separated horizontal synchronizing signal with said video signal during a predetermined time period.
Claim 15
Dependent Claim
63 words
A video signal processing device comprising: (a) separting means for receiving said video signal and for separating a horizontal sychronizing signal from said video signal; (b) delay means for receiving and delaying said separated horizontal synchronizing signal for a predetermined period of time; and (c) means for supplying such delayed separated horizontal synchronizing signal with said video signal during a predetermined time period.
Claim 16
Dependent Claim
19 words
A device according to claim 12, wherein said predetermined period of time is different from one horizontal scanning period.
Claim 17
Dependent Claim
20 words
A device according to claim 13, wherein said predetermined period of time is longer than said one horizontal scanning period.
Claim 18
Dependent Claim
27 words
A device according to claim 12, wherein said video signal has a vertical blanking period and wherein said predetermined time period corresponds to said vertical blanking period.
Claim 19
Dependent Claim
32 words
A device according to claim 12, wherein said delay means delays said separated horizontal synchronizing signal and provides said delayed separated horizontal synchronizing signal repeatedly for every said predetermined period of time.
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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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |