CIRCUIT FOR REMOVING AUDIO NOISE

摘要

PURPOSE: A noise removing circuit for an audio system is provided to obtain clear original sound from which the noise transmitted from an engine is completely removed in a simplified circuit arrangement, thereby reducing the manufacturing cost. CONSTITUTION: A noise removing circuit for an audio system includes a first buffer(20) for outputting a signal of same phase with an input audio signal, and a second buffer(40) inverting the signal output from the first buffer, wherein the first buffer is applied with the input audio signal at a first non-invert input terminal(2) and a signal fed-back via a resistance(R3) at a first invert input terminal(1) for outputting a signal of a same phase with the input audio signal as a buffer amplifier, and the second buffer is applied with the signal output from the first buffer at a second invert input terminal(4) via a resistance(R4) and a ground at a second non-invert input terminal(5) for inverting the input phase to remove all noise included in the ground signal.