IF signal processing circuit for video signal and sound system f

Details IF signal processing circuit for video signal and sound system f IF signal processing circuit for video signal and sound system f

1996-12-24

2000-07-25

Powell, Mark R.

Television

Basic receiver with additional function

Multimode

348736, 348554, H04N 544, H04N 546

Patent

active

060942290

ABSTRACT:
The following means are integrated in one IF IC: the switching part 60 in the video signal passage for changing over a plurality of sound trap circuits and equalizing circuits 61-64; the switching part 66 in the sound signal passage for changing over a plurality of band-pass filters 67-70 to pass the intercarrier signals of different frequencies; the switching parts (77A, 77B, 78) for adjusting the gains to regulate the difference of sound signal level caused by different frequency modulation degree of each broadcasting system to the constant level and for changing over deemphasis time constant. In addition, the same IF IC contains the FM demodulating circuit 80 of PLL system to demodulate the sound intercarrier and the controller 81 for controlling the changeover of switching parts 60, 66, 78. As a result, the IF IC of very high integration density has been achieved, and the number of components of IF signal processing circuit can be decreased.

REFERENCES:
patent: 4511924 (1985-04-01), Griffis
patent: 5355162 (1994-10-01), Yazolino

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