Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1997-06-10
2000-04-11
Faile, Andrew I.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348685, 348555, 375345, 4552401, 4552471, 4552501, H04N 552
Patent
active
060493615
ABSTRACT:
An automatic gain control (AGC) circuit of a high definition television (HDTV) signal receiver and a method to compensate for a change in amplitude of a high definition signal. The AGC circuit of the high definition signal receiver includes a non-coherent AGC signal generator for generating a first AGC signal according to the magnitude of the IF signal, a coherent AGC signal generator for generating a second AGC signal according to the magnitude of the segment synchronizing signal, and a selector for selecting the second AGC signal when the segment synchronizing signal is detected and the first AGC signal when the segment synchronizing signal is not detected and providing the selected signal to a tuner/IF demodulator. The amplitude of the received signal is controlled within a short period of time using the non-coherent AGC generator and method having a fast response time before a system is stabilized and the amplitude of the received signal is controlled more correctly using the coherent AGC generator and method after the segment synchronizing signal is detected.
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patent: 5086340 (1992-02-01), Citta et al.
patent: 5546138 (1996-08-01), Krishnamurthy et al.
patent: 5636252 (1997-06-01), Patel et al.
patent: 5694436 (1997-12-01), Huang et al.
patent: 5745531 (1998-04-01), Sawahashi et al.
Bahgi Habte
Faile Andrew I.
Samsung Electronics Co,. Ltd.
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