US4916542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Picture quality adjusting circuit with fir filter for digital processing
Assignee: Toshiba Corp
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Filing: 1989-02-23
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Granted: 1990-04-10
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Expires: 2009-02-23
Abstract
Abstract A circuit for adjusting a picture quality by processing a digital video signal. A digital filter receives the digital video signal and extracts a high-frequency component therefrom. A first waveform-shaping element wave-shapes the high-frequency component to provide a noise cancel signal for canceling the noise. A second waveform-shaping element wave-shapes the high-frequency component to provide a contour compensation signal for compensating a contour of a picture. An adder adds the digital video signal, the noise cancel signal and the contour compensation signal to provide a signal with adjusted picture quality.
Inventors
- 👤 Minoru Yoneda
- 👤 Akihiko Enomoto
- 👤 Takashi Koga
- 👤 Hiroshi Kobata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:35
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208; H04N5/21; H04N5/142
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
A circuit for adjusting a picture quality by processing a video signal, said video signal including a noise, comprising: filter means for receiving said video signal and extracting a high-frequency component therefrom; first waveform-shaping means for wave-shaping said high-frequency component extracted by said filter means to provide a noise cancel signal for canceling the noise; second waveform-shaping means for wave-shaping said high-frequency component extracted by said filter means to provide a contour compensation signal for compensating a contour of a picture; and adder means for adding said video signal, said noise cancel signal from said first waveform-shaping means and said contour compensation signal from said second waveform-shaping means to provide a signal with adjusted picture quality.
Claim 2
Dependent Claim
116 words
A circuit for adjusting a picture quality by processing a video signal, said video signal including a noise, comprising: filter means for receiving said video signal and extracting a high-frequency component therefrom; first waveform-shaping means for wave-shaping said high-frequency component extracted by said filter means to provide a noise cancel signal for canceling the noise; second waveform-shaping means for wave-shaping said high-frequency component extracted by said filter means to provide a contour compensation signal for compensating a contour of a picture; and adder means for adding said video signal, said noise cancel signal from said first waveform-shaping means and said contour compensation signal from said second waveform-shaping means to provide a signal with adjusted picture quality.
Claim 3
Dependent Claim
16 words
The circuit according to claim 1, further comprising amplifier means for amplifying said noise cancel signal.
Claim 4
Dependent Claim
16 words
The circuit according to claim 1, further comprising amplifier means for amplifying said contour compensation signal.
Claim 5
Dependent Claim
29 words
The circuit according to claim 1, further comprising amplifier means for amplifying said noise cancel signal and variable resistor means for externally adjusting a gain of said amplifier means.
Claim 6
Dependent Claim
29 words
The circuit according to claim 1, further comprising amplifier means for amplifying said contour compensation signal and variable resistor means for externally adjusting a gain of said amplifier means.
Claim 7
Dependent Claim
49 words
The circuit according to claim 1, wherein said video signal is a digital signal, and said filter means includes a finite impulse, response filter for processing the digital signal, said finite impulse response filter including a plurality of series-coupled delay elements, a plurality of coefficient multipliers, and an adder.
Claim 8
Dependent Claim
23 words
The circuit according to claim 1, wherein said first waveform-shaping means includes a limiter for limiting said high-frequency component with a predetermined level.
Claim 9
Dependent Claim
37 words
The circuit according to claim 1, wherein said first waveform-shaping means includes a limiter for limiting said high-frequency component with a predetermined level, said limiter having a comparator for comparing said high-frequency component with said predetermined level.
Claim 10
Dependent Claim
23 words
The circuit according to claim 1, wherein said second waveform-shaping means includes a slicer for slicing said high-frequency component with a predetermined level.
Claim 11
Dependent Claim
37 words
The circuit according to claim 1, wherein said second waveform-shaping means includes a slicer for slicing said high-frequency component with a predetermined level, said slicer having a comparator for comparing said high-frequency component with said predetermined level.
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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) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |