Quiet power up and power down of a digital audio amplifier

A closed loop audio amplifier system and method of powering up/down the system without producing audible artifacts are provided. During power up, a prebias voltage is provided to each output connected to a speaker to increase the voltage to a nominal output level. High impedance switches are then dr...

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Hauptverfasser:	ROECKNER WILLIAM J, CONNELL LAWRENCE E, RAKERS PATRICK L, MIDYA PALLAB, STEWART BRADLEY C, MAVENCAMP DANIEL A
Format:	Patent
Sprache:	eng
Schlagworte:	AMPLIFIERS BASIC ELECTRONIC CIRCUITRY ELECTRICITY PULSE TECHNIQUE
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creator	ROECKNER WILLIAM J CONNELL LAWRENCE E RAKERS PATRICK L MIDYA PALLAB STEWART BRADLEY C MAVENCAMP DANIEL A
description	A closed loop audio amplifier system and method of powering up/down the system without producing audible artifacts are provided. During power up, a prebias voltage is provided to each output connected to a speaker to increase the voltage to a nominal output level. High impedance switches are then driven at a 50% duty cycle. Feedback from the output is supplied to a servo, which is enabled to fine tune the output voltage. Low impedance switches are then driven at a 50% duty cycle at a quarter cycle timing. The order of the feedback loop depends on which of the high or low impedance switches are driven. The prebias voltage is then removed before audio signals to be amplified are supplied to the system. Timing of driving of the switches is programmable. To power down, essentially the reverse sequence is provided.
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subjects	AMPLIFIERS BASIC ELECTRONIC CIRCUITRY ELECTRICITY PULSE TECHNIQUE
title	Quiet power up and power down of a digital audio amplifier
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