Patent ID: 8934634
Filing Date: 2015-01-13
Classification: H04B

Abstract:
1. A stereo signal processing circuit which decodes an L+R signal and an L−R signal from an input signal and obtains an L signal and an R signal through an addition and a subtraction between the L+R signal and the L−R signal, the stereo signal processing circuit comprising: an adjacent interference detecting circuit which compares a signal level of a wide band signal which is a desired station signal of a relatively wide band and a signal level of a narrow band signal which is a desired station signal of a relatively narrow band, and detects adjacent interference in response to a comparison of the signal level of the narrow band and the signal level of the wide band signal; an attenuating circuit which attenuates the L−R signal; and a controller having an output coupled to the attenuating circuit for controlling a gain thereof, wherein the controller selectively attenuates the L−R signal at a start level of the narrow band signal and the start level of the narrow band signal varies based on the adjacent interference.