Noise reduction device and television receiver

A television receiver comprising:

• a cathode ray tube comprising a deflecting coil and an auxiliary deflecting coil for scanning velocity modulation;
• a noise reduction circuit which reduces noise by carrying out an arithmetic operation on an input video signal and one of a frame-delayed signal and a field-delayed signal of the video signal and maintains a noise reduction level to be a constant value;
• a noise detection circuit which detects a noise level of the video signal;
• an aperture correction circuit which corrects image quality using a high-frequency component extracted from the video signal as a correction signal;
• a velocity modulation circuit which corrects image quality by supplying a high-frequency component extracted from the video signal to the auxiliary deflecting coil as a scanning velocity modulation signal;
• and
• a control circuit which controls a level of the correction signal of the aperture correction circuit and a level of the scanning velocity modulation signal of the velocity modulation circuit in accordance with the detection level of the noise detection circuit.

A noise reduction device comprising:

• a noise reduction unit which reduces a noise components signal from an input video signal in a constant gain, the noise components signal is extracted by difference between current input signal and a preceding video signal;
• a detection unit which detects a noise level of the input video signal;
• a correction unit which corrects image quality using a high-frequency component extracted from the video signal as an outline enhancement correction signal;
• a modulation unit which corrects image quality by supplying the high-frequency component extracted from the video signal to an auxiliary deflecting coil of a cathode ray tube as a scanning velocity modulation signal;
• and
• a control unit which controls a correction gain of at least one of the correction unit or the velocity modulation unit so as to inverse proportion to noise level.