US Patent 7990212 Modulated audio amplifier output enable control

Patent 7990212 was granted and assigned to Cirrus Logic on August, 2011 by the United States Patent and Trademark Office.

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Patent abstract

A modulated amplifier output enable control eliminates audible pops when enabling and disabling an audio amplifier output stage. The output of the audio amplifier is transitioned between an enabled state and a disabled state using a modulated control signal that enables and disables the output of the audio amplifier. Durations of the enabled state vs. the disabled state of the amplifier are adjusted to cause a transition between a fully disabled state and a fully enabled state of the audio amplifier so that the transition between the disabled state and the enabled state of the amplifier output is inaudible.

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Patent Inventor Names

Robin Matthew Tsang0

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