Error-free pulse noise canceler used in FM tuner

Abstract

A pulse noise canceler in which the sensibility of FM pulse noise detection is decreased when an FM wave exceeding the minimum bandwidth which is predetermined of an FM wave detector is input to the pulse noise canceler. In order to detect pulse noise from an output from the FM wave detector in an FM tuner to open a holding gate, an FM pulse noise detector is constituted by a high-pass filter, a variable control amplifier, a full wave detector, and the like. An over deviation detector is constituted by a signal meter for detecting a received field strength, an attenuator, and a high-pass filter, thereby detecting an over deviation level of the FM wave detector. This detection output from the over deviation detector is input to a bottom peak detector and becomes an over deviation signal. An over deviation signal from the over deviation detector is incorporated in the arrangement of a noise AGC amplifier in the FM pulse noise detector to influence control of the holding gate.

Dependencies are inferred from the claim text.