Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1992-02-12
1994-03-29
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
358340, H04N 964
Patent
active
052990028
ABSTRACT:
A picture quality correcting device which no longer relies solely on the frequency characteristic for picture quality correction, and which prevents disturbance in the group delay characteristic occurring due to a large variation in the frequency characteristic of the luminance signal, thereby greatly decreasing deterioration of picture quality of the played-back image. A noise component from the luminance signal is extracted by a noise canceller. Then, the noise component is deducted from the luminance signal by inverting the polarity of the noise component and composing it with the luminance signal. The high-frequency component of the luminance signal released by the noise canceller is corrected by a picture-tone circuit. The amount of noise suppression of the noise canceller and the amount of correction of the high-frequency component of the picture-tone circuit is made variable according to a control voltage by adjusting a picture quality adjuster. The amount of noise suppression of the noise canceller is adjusted, for example, according to a limiting level setting voltage generated by an LLC circuit.
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patent: 4768094 (1988-08-01), Ichinoi
patent: 4827342 (1989-05-01), Ohta et al.
patent: 4860105 (1989-08-01), Sakaguchi et al.
patent: 5079633 (1992-01-01), Hagino et al.
patent: 5126846 (1992-06-01), Niimura
patent: 5136386 (1992-08-01), Okada
Kostak Victor R.
Sharp Kabushiki Kaisha
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