Car audio system with automatic volume control and its automatic volume control method

摘要

A first step of separating a modulated wave, which is composed of a tuner part, an electronic volume part, an amplifying part, and a control part, into a primary selected broadcasting channel into a voice signal and a carrier signal; A second step of storing the carrier signal separated in the first step and adjusting the volume of the voice signal and outputting the adjusted voice signal through a speaker; A third step of separating a modulated wave transmitted through the secondary selected broadcasting channel into a voice signal and a carrier signal; If the size of the carrier signal separated in the third step is different from the size of the carrier signal stored in the second step and the volume of the voice signal separated in the third step is different from that of the carrier signal adjusted in the second step, And outputting the audio signal through the speaker. The present invention relates to a car audio system capable of adjusting an automatic volume and a method for adjusting the volume of an audio signal, It is possible to always output a sound of a certain size through the speaker by adding or subtracting the volume of the radio, so that a driver can select a broadcast channel and listen to a radio broadcast selected with a desired sound volume without manually adjusting the radio volume .