Unterbrechung des ZF-Videosignalwegs während der FM-Rundfunkbetriebsart in einem Fernsehempfänger

摘要

A television receiver includes a single tuner for tuning both television channels and broadcast FM stations. The tuner (102) serves as the first conversion stage of a double conversion FM receiver, wherein the mixer (180b) of an FM radio integrated circuit (180) serves as the second conversion stage. The receiver provides an on-screen display (410) of the currently tuned FM channel number. Circuitry (110,105,Q,Q2) is provided for interrupting the path of signals from the tuner to the IF amplifier stage of the television receiver when the receiver is in FM radio signal reception mode, to prevent the FM radio signals from adversely affecting the television synchronizing signals during the display of the FM channel number.