Circuit for reducing audio amplifier noise during powering on an

Details Circuit for reducing audio amplifier noise during powering on an Circuit for reducing audio amplifier noise during powering on an

1997-03-15

1998-08-11

Harvey, Jack B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330267, 330 10, 330297, 369124, G06F 126

Patent

active

057940576

ABSTRACT:
An audio power management system for a computer to eliminate noise signals associated with the power-down and power-up operations of the computer during power management operations. The audio power management system asserts a speaker mute signal before power is removed from the amplifier to reduce transient conditions. During power up, the speaker mute signal is applied to the amplifier for a period after power is applied to the amplifier. This control is done from a single digital output.

REFERENCES:
patent: 4441086 (1984-04-01), Karlow et al.
patent: 4673889 (1987-06-01), Cini et al.
patent: 4674031 (1987-06-01), Siska, Jr.
patent: 4710771 (1987-12-01), Banno et al.
patent: 5144441 (1992-09-01), Sparks et al.
patent: 5307025 (1994-04-01), Colvin et al.
patent: 5410713 (1995-04-01), White
patent: 5428494 (1995-06-01), Ahuja
patent: 5442617 (1995-08-01), Kim
patent: 5442627 (1995-08-01), Kim
LM 1971 .mu.POT.TM. Digitally controlled 62 dB Audio Attenuator with Mute.
LM 1973 .mu.POT.TM. 3-Channel 76dB Audio Attenuator with Mute.

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