公开(公告)号：EP1150500A2

公开(公告)日：2001-10-31

申请号：EP01303767.6

申请日：2001-04-25

申请人： SONY CORPORATION

发明人： Yanagi, Shigeto, c/o Sony Corporation ,  Nagano, Toshiyuki, c/o Sony Corporation ,  Sano, Hiromichi, c/o Sony Corporation ,  Kaida, Takayuki, c/o Sony Corporation

IPC分类号： H04N5/455

CPC分类号： H04N5/60 ,  H04N5/4446 ,  H04N5/455 ,  H04N5/52 ,  H04N21/4263 ,  H04N21/43632

摘要： A band-pass filter (175) separates an audio intermediate frequency signal (SIFS) from an input television intermediate frequency signal (SIF), and an A/D converter circuit (215) converts the signal (SIFS) into a digital signal (DIFS). A digital signal processor (225) performs audio detection on the signal (DIFS) and forms an AGC signal (DAGCS) based on the signal (DIFS). A variable gain amplifier (185) performs AGC on the audio intermediate frequency signal. A band-pass filter (175) separates and takes out a video intermediate frequency signal (SIFP) from the input television intermediate frequency signal (SIF), and an A/D converter circuit (21P) converts the signal (SIFP) into a digital signal (DIFP). A digital signal processor (22P) performs video detection on the signal (DIFP). An AGC signal (DAGC) is formed based on the signals (DIFP) and AGC is performed on the input television intermediate frequency signal (SIF) by using the AGC signal (DAGC).