Audio signal processing circuit
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United States of America Patent
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May 21, 2013
Grant Date -
Apr 1, 2010
app pub date -
Sep 29, 2009
filing date -
Sep 29, 2008
priority date (Note) -
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Abstract
An audio signal processing circuit comprising: a modulation circuit configured to output a modulated signal of a frequency corresponding to an input audio signal; a drive circuit configured to generate a driving current for driving the modulation circuit based on a control signal; an audio detection circuit configured to detect presence or absence of the audio signal input to the modulation circuit; and a control signal generation circuit configured to generate the control signal for generating the driving current in the drive circuit when the presence of the audio signal is detected and generate the control signal for stopping generation of the driving current in the drive circuit when the absence of the audio signal is detected for a predetermined period, based on a detection result of the audio detection circuit.
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