Audio amplifier
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United States of America Patent
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Oct 10, 1989
Grant Date -
N/A
app pub date -
Feb 19, 1988
filing date -
Feb 20, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An audio amplifier whose operating point and supply voltage can be change in response to a level of an input signal. The audio amplifier includes a delay circuit for delaying an input signal, an amplifier circuit having an amplification device for amplifying an output signal of the delay circuit, the amplifier circuit having a variable operating point, a power supply circuit capable of changing a supply voltage to the amplifier circuit, and a control circuit for detecting a level of the input signal to output a control signal corresponding to the detecting level, and changing the operating point and supply voltage of the amplifier circuit, in response to a level change of the input signal.
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