Fm receiver with noise suppression during rayleigh faded received signals

Noise pops in the audio output of a receiver due to Rayleigh fading of the received signal are minimised by using a controllable attenuator (30) in series with the audio output. A first signal (40) is generated which is proportional to the strength of the received signal. A second signal (<V>c) which determines the amount of attenuation is generated in response to the first signal (40) so that the audio output is attenuated during Rayleigh fades when the first signal (40) decreases below a predetermined threshold. The threshold is set relative to the average strength of the received signal. Preferably attenuation increases at a rate greater than the decrease in the received signal level. The increased attenuation results in lower audio output and thus mutes the magnitude of the pop generated during the fade.