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US5130858A
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Apparatus having a field memory for reproducing video signals
Assignee: Sanyo Electric Co Ltd
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Filing: 1990-11-16
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Granted: 1992-07-14
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Expires: 2010-11-16
Abstract
Abstract A video signal reproducing apparatus, such as a video disc player, equipped with a field memory for special reproduction such as still-picture reproduction. The video signal writing-reading period for the field memory is set to a value which is the color subcarrier period multiplied by an integer, is also the horizontal synchronizing period multiplied by an integer and is further approximate to one field period to the greatest possible extent, to thereby eliminate the discontinuity of video signals due to the track jumping action of the pickup.
Inventors
- 👤 Masami Ebara
- 👤 Yasuo Onishi
- 👤 Yukio Sugimura
- 👤 Shinya Okuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:24
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/87; H04N9/877
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
An apparatus for reproducing video signals, comprising: signal reading means for reproducing video signals recorded in a signal recording medium; a field memory means for receiving and writing thereinto substantially one field of video signals reproduced by said signal reading means at a constant video signal writing period; a circuit means for controlling writing in said field memory means and for controlling reading out therefrom at a constant video signal writing-reading period, wherein said video signal writing-reading period for said field memory means is set to a value which is a color subcarrier period multiplied by an integer, said writing-reading set period value also being a horizontal synchronizing period defined by symbol H multiplied by an integer, said value being substantially equivalent to one field period; and means operably coupled to said field memory means for repeatedly controlling reading out said substantially one field of video signals from said field memory means at said constant video signal writing-reading period to therapy attain a special reproduction mode by a series of read out video signals without causing any discontinuation problems at a field junction.
Claim 2
Independent Claim
183 words
An apparatus for reproducing video signals, comprising: signal reading means for reproducing video signals recorded in a signal recording medium; a field memory means for receiving and writing thereinto substantially one field of video signals reproduced by said signal reading means at a constant video signal writing period; a circuit means for controlling writing in said field memory means and for controlling reading out therefrom at a constant video signal writing-reading period, wherein said video signal writing-reading period for said field memory means is set to a value which is a color subcarrier period multiplied by an integer, said writing-reading set period value also being a horizontal synchronizing period defined by symbol H multiplied by an integer, said value being substantially equivalent to one field period; and means operably coupled to said field memory means for repeatedly controlling reading out said substantially one field of video signals from said field memory means at said constant video signal writing-reading period to therapy attain a special reproduction mode by a series of read out video signals without causing any discontinuation problems at a field junction.
Claim 3
Dependent Claim
23 words
An apparatus as defined in claim 1, wherein said video signal writing-reading period for said field memory means is set to 262 H.
Claim 4
Dependent Claim
23 words
An apparatus as defined in claim 1, wherein said video signal writing-reading period for said field memory means is set to 264 H.
Claim 5
Dependent Claim
71 words
An apparatus as defined in claim 1, wherein said writing-reading control circuit means comprises a writing address counter means and a reading address counter means for counting clock signal pulses from a common clock signal source to thereby produce a writing address signal and a reading address signal respectively, and wherein said writing address signal and the reading address signal are fed to a memory circuit having said field memory means.
Claim 6
Dependent Claim
26 words
An apparatus as defined in claim 1, wherein said signal recording medium is an optical disc, and said signal reading means is an optical pickup device.
Claim 7
Dependent Claim
26 words
An apparatus as defined in claim 1, wherein said signal recording medium is a magnetic tape, and said signal reading means is a magnetic head device.
Claim 8
Dependent Claim
59 words
An apparatus as defined in claim 1, further comprising change-over switch means for switching over between ordinary reproduction and special reproduction, said change-over switch means having two input terminals, one input terminal being connected to an output terminal of said signal reading means and the other input terminal being connected to an output terminal of said field memory means.
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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) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |