Apparatus and method for pop-and-click suppression with fast...

Details Apparatus and method for pop-and-click suppression with fast... Apparatus and method for pop-and-click suppression with fast...

2007-01-16

2007-01-16

Pascal, Robert (Department: 2817)

Amplifiers

With periodic switching input-output

C381S094500

Reexamination Certificate

active

10910691

ABSTRACT:
A circuit for audio amplification includes an amplifier and a first input resistor. The amplifier is arranged to provide an amplifier output signal that is based, in part, on a capacitively-coupled audio input signal. The capacitively-coupled audio input signal is based, in part, on an input RC value. The input RC value is given by the input capacitance times the input resistance. The input resistance is reduced during the turn-on in order to achieve a fast turn-on time with minimal pop-and-click noise. Also, the input resistance is increased to its normal value after the turn-on so that full audio fidelity is substantially maintained during normal operation.

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patent: 5703528 (1997-12-01), Nebuloni et al.
patent: 2004/0218319 (2004-11-01), Sae-Ueng et al.
National Semiconductor Corporation, “Fixed Gain 1 Watt Audio Power Amplifier”, LM4820-6, Apr. 2002, pp. 1-18.

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