Audio amplifier and power supply voltage switching method
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United States of America Patent
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Feb 14, 2017
Grant Date -
Jan 29, 2015
app pub date -
Feb 6, 2013
filing date -
Feb 23, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An audio amplifier is provided with: an amplifier circuit; a power supply circuit that generates a plurality of power supply voltages; a power supply relay that selects one of the power supply voltages as the power supply voltage supplied to the amplifier circuit; a switching condition determiner that determines whether the switching condition of the power supply relay is satisfied; a silent section detector that detects a silent section of the audio signal which is equal to or greater than the operation time of the power supply relay; and a switching instruction unit for providing the power supply relay with an instruction for switching the power supply voltage during the silent section when the switching condition is satisfied and the silent section is detected.
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