quiet tuning[′kwī·ət ′tün·iŋ]
the resetting of a radio receiver from one station to another in such a way that atmospheric and industrial static, as well as internal static, on the loudspeaker is greatly reduced or eliminated. Quiet tuning is accomplished by means of an electrical device equipped with various circuits that block out (switch off) the audio frequency amplification stages or sharply reduce the band of low frequencies that can pass through, or circuits that switch on a relay that breaks the loudspeaker circuit, and so on. When the receiver is accurately tuned to the wave from a transmitting station, the quiet-tuning device is automatically disconnected. It is used in certain radio receivers.