Audio demodulating circuit and television broadcast receiver

Details Audio demodulating circuit and television broadcast receiver Audio demodulating circuit and television broadcast receiver

2007-08-28

2007-08-28

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S264000, C455S337000, C455S180300, C375S327000, C348S726000

Reexamination Certificate

active

10360649

ABSTRACT:
An audio demodulating circuit in accordance with the present invention for demodulating audio signals in a plurality of broadcast systems of mutually different frequency deviations such as the NTSC and the PAL, is arranged such that a connection between a trap circuit for suppressing adjacent interference and an intermediate frequency signal line can be controlled without using an externally applied special signal, based on a control voltage applied from a phase comparator with respect to a voltage control oscillator which generates a local oscillation signal for extracting an audio signal from the intermediate frequency signal.

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