H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/21 (2006.01) H04N 5/911 (2006.01) H04N 5/931 (2006.01)
Patent
CA 2060861
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.
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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