AUDIO SIGNAL AUTOMATIC CONTROL SYSTEM

摘要

a volume control unit(7) for adjusting the volume of an audio signal; an oscillator (30) for generating a clock signal; a mute detecting unit(100) for detecting a mute period from the section of the audio signal; an external audio detecting unit(40) synchronized by the oscillating clock of the oscillator; an A/D converter(20) for digitizing the external audio signal during the mute period; a storing unit(50) for outputting a digital signal detected during the mute period and storing a newly digitized signal; and first comparator(10) for producing an audio volume control signal by comparing the stored digital signal of the storing unit with the newly stored digital signal; thereby simplifying the circuit.