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

1995-03-03

1998-04-14

Shah, Alpesh M.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381 94, 330149, G06F 128

Patent

active

057404534

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 is disclosed. 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: 5428494 (1995-06-01), Ahuja
patent: 5442617 (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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