SWITCHING AUDIO AMPLIFIER, DIGITAL SPEAKING DEVICE AND AUDIO AMPLIFICATION METHOD
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United States of America Patent
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Issued Date -
Feb 4, 2010
app pub date -
Jul 31, 2008
filing date -
Jul 31, 2008
priority date (Note) -
Abandoned
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Abstract
A switching audio amplifier adapted in a digital speaking device for driving a speaker is provided. An audio amplification method implemented for the switching audio amplifier is also provided. In the switching audio amplifier, a comparison stage compares an audio input signal with a saw-tooth signal to generate a Pulse Width Modulation (PWM) signal. A driver stage buffers the PWM signal to drive the speaker. A detector detects amplitude of the input signal to generate a control signal, and a saw-tooth generator adjusts a transition rate of the saw-tooth signal based on the control signal.
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