Patent
1980-03-10
1982-01-19
Konick, Bernard
179 1VL, H03G 516
Patent
active
043118739
ABSTRACT:
A bias control circuit adapted to be utilized with complementary, tracking current sources for use in an audio reproduction system including volume and tone control circuits to optimize the signal to noise ratio of the system at maximum gain without compromising the signal handling capabilities of the system. The bias control circuit includes an interface circuit responsive to an applied volume control signal for varying a bias signal connected to the output of the interface circuit. A second and third circuit are coupled with the output of the interface circuit which are responsive to the bias signal for deriving, respectively, a volume output signal to control the gain of the volume control circuit and a current biasing signal for controlling the bias levels of the tone control circuits. The current biasing signal varys proportionally with increases in the volume control signal from a first level to a second level remaining constant thereafter. The current biasing signal is utilized to control the magnitude of the complementary, tracking current sources.
REFERENCES:
patent: 3849601 (1974-11-01), Goncharoff
patent: 4055818 (1977-10-01), Gay
Bingham Michael D.
Konick Bernard
Motorola Inc.
Popek J. A.
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