Digital amplitude control for digital audio signal

Details Digital amplitude control for digital audio signal Digital amplitude control for digital audio signal

1979-06-20

1981-05-26

Atkinson, Charles E.

Boots, shoes, and leggings

364606, 340347CC, H03G 300

Patent

active

042701775

ABSTRACT:
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.

REFERENCES:
patent: 3613112 (1971-10-01), Kanter
patent: 3641563 (1972-02-01), Cushman et al.
patent: 3790910 (1974-02-01), McCormack
patent: 3972626 (1976-08-01), Laskowsi
patent: 4011438 (1977-03-01), Aufderheide et al.
patent: 4044241 (1977-08-01), Hatley, Jr.
patent: 4064396 (1977-12-01), Panarello
patent: 4159524 (1979-06-01), Schollmeier et al.

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