Audio control system

Details Audio control system Audio control system

1975-12-19

1977-08-30

Dahl, Lawrence J.

Amplifiers

With plural amplifier channels

Amplifying different frequencies in different channels

179 1D, 179 1VL, 330 30R, H03F 368

Patent

active

040457486

ABSTRACT:
An audio control system for altering the frequency content of an audio signal with a d.c. control voltage. An audio signal is divided into a plurality of signal channels representing different portions of the audio signal frequency spectrum. Each signal channel is terminated by an attenuator which is responsive to a d.c. control voltage. The attenuated signals are then combined. By changing a d.c. control voltage a change in tone, volume, balance or loudness of an audio signal in a stereoamplifier or the like may be achieved.

REFERENCES:
patent: 2395159 (1946-02-01), Albin
patent: 3426292 (1969-02-01), Seidel
patent: 3539725 (1970-11-01), Hellwarth et al.
patent: 3846719 (1974-11-01), Dolby
patent: 3875334 (1975-04-01), Hilbert et al.
patent: 3903485 (1975-09-01), Dolby
Sansen et al. -- "Distortion in Bipolar Transistor Variable-Gain Amplifiers" IEEE Journal; pp. 275-282, Aug. 1973.

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