RECEIVER

PURPOSE:To eliminate a clock generator, a squelch wave detector, etc. for a receiver containing a switched capacitor filter included in an audio frequency amplifier, by producing the waveform of an intermediate frequency signal and then using it as a clock signal. CONSTITUTION:The intermediate frequency signal applied to an input terminal 1 is amplified by an intermediate frequency amplifier 2 and coverted into an audio frequency signal after undergoing a phase wave detection of a frequency discriminator 3. The audio signal is selected and amplified by an audio frequency amplifier 4 including a switched capacitor filter. In this case, the clock of the switched capacitor filter is produced by extracting an intermediate frequency signal out of a proper interstage output point of the amplifier 2 and then giving waveform shaping to the extracted frequency signal. Furthermore the operation of a waveform shaping device 9 is discontinued if the amplitude of the intermediate frequency signal applied to the terminal 1 is smaller than the threshold value. As a result, a squelch function is also realized.