Noise reducing circuit for video signal
AssigneeVictor Company of Japan, Ltd.
InventorMasaji Yoshida
Life of this patent
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Abstract
In a noise reducing circuit for a video signal comprising a first subtractor (2), a delay line (3), a second subtractor (4), a non-linear circuit (7) having a full-wave rectification circuit (7b) and a gain control circuit (7a), the gain control circuit (7a) controls a gain such that an output signal level derived from the non-linear circuit (7) increases in accordance with the increase in an output signal from the full-wave rectification circuit (7b) when the output signal level of the second subtractor (4) is within a determined extent, and that the output signal level derived from the non-linear circuit (7) decreases in accordance with the increase in the output signal from the full-wave rectification circuit (7b) when the output signal level of the second subtractor (4) is out of the determined extent.
Claims5
A noise reducing circuit for a video signal, comprising:
- (a) a delaying means for delaying said video signal;
- (b) a first subtracting means for subtracting an output signal of said delaying means from said video signal;
- (c) a full-wave rectification circuit means for full-wave rectifying said output signal from said first subtracting means;
- (d) a gain control circuit means for controlling an amplitude of said output signal from said first subtracting means in accordance with an output signal from said full-wave rectification circuit means;
- and
- (e) a second subtracting means for subtracting an output signal of said gain control circuit from said video signal thereby producing an output signal of said noise reducing circuit.
A noise reducing circuit for a video signal, comprising:
- (a) a first subtracting means responsive to said video signal;
- (b) a delaying means for delaying an output signal from said first subtracting means;
- (c) a second subtracting means for subtracting an output signal of said delaying means from said video signal;
- (d) a full-wave rectification circuit means for full-wave rectifying said output signal from said second subtracting means;
- and
- (e) a gain control circuit means for controlling an amplitude of said output signal from said second subtracting means in accordance with an output signal from said full-wave rectification circuit means, an output signal from said gain control circuit being fed to said first subtracting means to be subtracted from said video signal.
Dependencies are inferred from the claim text.