Circuit for eliminating pop sounds at power on and off by a...

Details Circuit for eliminating pop sounds at power on and off by a... Circuit for eliminating pop sounds at power on and off by a...

2008-02-04

2011-12-20

Ha, Nathan (Department: 2814)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Soft switching, muting, or noise gating

Reexamination Certificate

active

08081774

ABSTRACT:
A circuit for eliminating pop sounds at power on and off by a moderate waveform, which includes a switch, a feedback network, an operational amplifier and an output network. When power-on, a first input terminal of the switch is connected to a low voltage, and an output terminal of the output network provides an operating DC bias which is gradually increased. When power-off, the first input terminal of the switch is connected to a reference voltage, and the output terminal of the output network provides an operating DC bias which is gradually reduced.

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