Sigma-delta modulator approach to increased volume resolution in audio output stages
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United States of America Patent
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Sep 22, 2015
Grant Date -
May 16, 2013
app pub date -
Nov 18, 2011
filing date -
Nov 14, 2011
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Abstract
A variable gain analog amplifier is described that uses pulse-density modulation in the form of a sigma-delta modulator (SDM) to produce a gain by modulating the selection of a switch that selects the amount of resistance in a negative feedback loop of the amplifier. The output of the SDM is dithered to increase the gain resolution of the analog amplifier, wherein the increased resolution produces a quiet, inaudible transition between changes in gain setting at an output of the variable gain amplifier and in addition produces a quiet, inaudible mixing and merging of audio signals.
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