Digital method to eliminate power-on pops and clicks

Details Digital method to eliminate power-on pops and clicks Digital method to eliminate power-on pops and clicks

1996-12-05

1998-08-18

Isen, Forester W.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Soft switching, muting, or noise gating

351120, H04B 1500

Patent

active

057968519

ABSTRACT:
A personal computer audio system is presented with a mechanism for digitally regulating the rate of voltage change of an audio output signal In one embodiment, the audio output signal from an integrated circuit is provided by means of a two-state audio amplifier. The first state of the amplifier is a high impedance state which exists prior to power-on and is maintained until an enable signal is asserted. When the enable signal is asserted, the amplifier drives the audio output signal line. Prior to the transition from the first to second states, a D/A converter is used to provide a ramp signal from the minimum voltage to the nominal operating voltage. The state transition is then initiated during the initial portion of the ramp signal.

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patent: 4947440 (1990-08-01), Bateman et al.
patent: 5151942 (1992-09-01), Sasaki
patent: 5199079 (1993-03-01), Anderson et al.

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