Patent EP0331017A2 successfully refreshed from Google Patents.
EP0331017A2
Expired / Lapsed
EP
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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: —
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Expires: 2009-02-23
Abstract
Abstract A digital filter (22) receives the digital video signal and extracts a high-frequency component therefrom. A first waveform-shaping element (24) wave-shapes the high-frequency component to provide a noise cancel signal for canceling the noise. A second waveform-shaping element (26) wave-shapes the high-frequency component to provide a contour compensation signal for compensating a contour of a picture. An adder (28) adds the digital video signal, the noise cancel signal and the contour compensation signal to provide a signal with adjusted picture quality.
Inventors
- 👤 Minoru C/O Patent Division Toshiba Yoneda
- 👤 Akihiko C/O Patent Division Toshiba Enomoto
- 👤 Takashi C/O Patent Division Toshiba Koga
- 👤 Hiroshi C/O Patent Division Toshiba Kobata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:12
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208; H04N5/21; H04N5/142
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
78 words
A circuit for adjusting a picture quality by processing a digital video signal, said circuit characterized by: digital filter means (22) for receiving said digital video signal and extracting a high-frequency component therefrom; waveform-shaping means (24, 26) for wave-shaping said high-frequency component extracted by said digital filter means (22); and adder means (28) for adding said digital video signal and said high-frequency component wave-shaped by said waveform-shaping means (24, 26) to provide a signal with adjusted picture quality.
Claim 2
Dependent Claim
78 words
A circuit for adjusting a picture quality by processing a digital video signal, said circuit characterized by: digital filter means (22) for receiving said digital video signal and extracting a high-frequency component therefrom; waveform-shaping means (24, 26) for wave-shaping said high-frequency component extracted by said digital filter means (22); and adder means (28) for adding said digital video signal and said high-frequency component wave-shaped by said waveform-shaping means (24, 26) to provide a signal with adjusted picture quality.
Claim 3
Dependent Claim
26 words
The circuit according to claim 1, characterized by further comprising amplifier means (25, 27) for amplifying said high-frequency component wave-shaped by said waveform-shaping means (24, 26).
Claim 4
Dependent Claim
43 words
The circuit according to claim 1, characterized by further comprising amplifier means (25, 27) for amplifying said high-frequency component wave-shaped by said waveform-shaping means (24, 26) and variable resistor means (30, 31) for externally adjusting a gain of said amplifier means (25, 27).
Claim 5
Dependent Claim
20 words
The circuit according to claim 1, characterized by further comprising a delay circuit (23) for delaying said digital video signal.
Claim 6
Dependent Claim
42 words
The circuit according to claim 1, characterized in that said digital filter means (22) includes a finite impulse response filter (22) including a plurality of series-coupled delay elements (221, 222), a plurality of coefficient multipliers (223 to 225) and an adder (226).
Claim 7
Dependent Claim
27 words
The circuit according to claim 1, characterized in that said waveform-shaping means (24, 26) includes a limiter (24) for limiting said high-frequency component with a predetermined level.
Claim 8
Dependent Claim
27 words
The circuit according to claim 1, characterized in that said waveform-shaping means (24, 26) includes a slicer (26) for slicing said high-frequency component with a predetermined level.
Claim 9
Dependent Claim
40 words
The circuit according to claim 1, characterized in that said waveform-shaping means (24, 26) includes a limiter (24) for limiting said high-frequency component with a predetermined level and a slicer (26) for slicing said high-frequency component with a predetermined level.
Claim 10
Dependent Claim
43 words
The circuit according to claim 1, characterized in that said waveform-shaping means (24, 26) includes a limiter (24) for limiting said high-frequency component with a predetermined level, said limiter (24) having a comparator (242) for comparing said high-frequency component with said predetermined level.
Claim 11
Dependent Claim
43 words
The circuit according to claim 1, characterized in that said waveform-shaping means (24, 26) includes a slicer (26) for slicing said high-frequency component with a predetermined level, said slicer (26) having a comparator (262) for comparing said high-frequency component with said predetermined level.
Claim 12
Dependent Claim
132 words
A circuit for adjusting a picture quality by processing a digital video signal, said digital video signal including a noise, characterized by: digital filter means (22) for receiving said digital video signal and extracting a high-frequency component therefrom; first waveform-shaping means (24) for wave-shaping said high-frequency component extracted by said digital filter means (22) to provide a noise cancel signal for canceling the noise; second waveform-shaping means (26) for wave-shaping said high-frequency component extracted by said digital filter means (22) to provide a contour compensation signal for compensating a contour of a picture; and adder means (28) for adding said digital video signal, said noise cancel signal from said first waveform-shaping means (24) and said contour compensation signal from said second waveform-shaping means (26) to provide a signal with adjusted picture quality.
Claim 13
Dependent Claim
132 words
A circuit for adjusting a picture quality by processing a digital video signal, said digital video signal including a noise, characterized by: digital filter means (22) for receiving said digital video signal and extracting a high-frequency component therefrom; first waveform-shaping means (24) for wave-shaping said high-frequency component extracted by said digital filter means (22) to provide a noise cancel signal for canceling the noise; second waveform-shaping means (26) for wave-shaping said high-frequency component extracted by said digital filter means (22) to provide a contour compensation signal for compensating a contour of a picture; and adder means (28) for adding said digital video signal, said noise cancel signal from said first waveform-shaping means (24) and said contour compensation signal from said second waveform-shaping means (26) to provide a signal with adjusted picture quality.
Claim 14
Dependent Claim
19 words
The circuit according to claim 11, characterized by further comprising amplifier means (25) for amplifying said noise cancel signal.
Claim 15
Dependent Claim
19 words
The circuit according to claim 11, characterized by further comprising amplifier means (27) for amplifying said contour compensation signal.
Claim 16
Dependent Claim
34 words
The circuit according to claim 11, characterized by further comprising amplifier means (25) for amplifying said noise cancel signal and variable resistor means (30) for externally adjusting a gain of said amplifier means (25).
Claim 17
Dependent Claim
34 words
The circuit according to claim 11, characterized by further comprising amplifier means (27) for amplifying said contour compensation signal and variable resistor means (31) for externally adjusting a gain of said amplifier means (27).
Claim 18
Dependent Claim
42 words
The circuit according to claim 11, characterized in that said digital filter means (22) includes a finite impulse response filter (22) including a plurality of series-coupled delay elements (221, 222), a plurality of coefficient multipliers (223 to 225) and an adder (226).
Claim 19
Dependent Claim
27 words
The circuit according to claim 11, characterized in that said first waveform-shaping means (24) includes a limiter (24) for limiting said high-frequency component with a predetermined level.
Claim 20
Dependent Claim
43 words
The circuit according to claim 11, characterized in that said first waveform-shaping means (24) includes a limiter (24) for limiting said high-frequency component with a predetermined level, said limiter (24) having a comparator (242) for comparing said high-frequency component with said predetermined level.
Claim 21
Dependent Claim
27 words
The circuit according to claim 11, characterized in that said second waveform-shaping means (26) includes a slicer (26) for slicing said high-frequency component with a predetermined level.
Claim 22
Dependent Claim
43 words
The circuit according to claim 11, characterized in that said second waveform-shaping means (26) includes a slicer (26) for slicing said high-frequency component with a predetermined level, said slicer (26) having a comparator (262) for comparing said high-frequency component with said predetermined level.
References Cited (Backward Citations)
No citation records indexed.
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