Audio IF amplifier for a multi-standard television receiver

摘要

Audio IF amplifier for a multi-standard television receiver. A parameter (Us) is obtained by evaluating the respective frequency of the received IF audio carrier (T1) with an FM demodulator (7). This controls the frequency of a mixing oscillator (6) in such a way that an audio carrier (T2) with the same frequency (5.5 MHz) is obtained by mixing, for all standards. <IMAGE>