US5204747A
Expired / Lapsed
US
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Aperture compensation circuit
Assignee: Sony Corp
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Filing: 1992-02-20
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Granted: 1993-04-20
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Expires: 2012-02-20
Abstract
Abstract An aperture compensation circuit which includes a first differentiating circuit for differentiating an input signal to its input terminal to provide a primary differentiated signal, a squaring circuit for squaring the primary differentiated signal to provide a first signal, a second differentiating circuit for differentiating the primary differentiated signal from the first differentiating circuit to provide a secondary differentiated signal as a second signal, and a dividing circuit for dividing the first signal by the second to provide a contour compensation signal which is not affected by the steepness degree of the input signal.
Inventors
- 👤 Kinya Shinkai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:53
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/142
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
An aperture compensation circuit comprising: (a) first differentiating means for differentiating an input video signal to provide a primary differentiated signal; (b) squaring means for squaring said primary differentiated signal to provide a first signal [E'(t)] 2 ; (c) second differentiating means for differentiating said primary differentiated signal to provide a secondary differentiated signal as a second signal; (d) dividing means for dividing said first signal by said second signal to provide a third signal; and (e) means for superimposing said third signal on said input video signal to compensate for a contour of the video signal.
Claim 2
Dependent Claim
97 words
An aperture compensation circuit comprising: (a) first differentiating means for differentiating an input video signal to provide a primary differentiated signal; (b) squaring means for squaring said primary differentiated signal to provide a first signal [E'(t)] 2 ; (c) second differentiating means for differentiating said primary differentiated signal to provide a secondary differentiated signal as a second signal; (d) dividing means for dividing said first signal by said second signal to provide a third signal; and (e) means for superimposing said third signal on said input video signal to compensate for a contour of the video signal.
Claim 3
Dependent Claim
27 words
An aperture compensation circuit according to claim 1, wherein said superimposing means is a subtracter in which said third signal is subtracted from said input video signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-19 | 1996-10-19 | 1997-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-19 | 2000-10-19 | 2001-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-19 | 2004-10-19 | 2005-04-20 | $7700.00 | Window Closed / Lapsed |