Digital amplitude control for digital audio signal

摘要

A digital amplitude control apparatus for a digital audio signal in which the output voltage of a linear-type potentiometer or attenuator connected across a DC power supply is converted into a digital signal by an A/D converter, the output voltage being linearly related to the manipulated variable of the slider of the potentiometer, the digital signal is applied as an address signal to a memory which stores in memory locations thereof a series of amplitude control digital values with a desired amplitude changing characteristic, thereby reading out of an accessed location a amplitude control value corresponding to the attenuation set by the potentiometer, and a digitized audio information signal to be amplitude-controlled is multiplied by the amplitude control value read out of the memory by means of a digital multiplier.