Sampling frequency conversion apparatus
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[0024] An embodiment of the present invention will now be described with reference to the accompanying drawings.
[0025] In this embodiment, the invention is applied to an apparatus that converts the sampling frequencies of audio data of each of the input channels in an audio amplifier apparatus that processes digital audio data of multiplicity of channels. The audio amplifier apparatus of this embodiment is called digital amplifier which forms PWM (Pulse Width Modulation) signals based upon the digital audio data that are supplied, effects the direct switching operation for a predetermined power source relying upon the PWM signals to obtain amplified outputs for driving the speakers.
[0026] In this embodiment, the digital audio data for forming the PWM signals in the audio amplifier apparatus must have a particular sampling frequency. The amplifier apparatus is provided with a sampling frequency converter for converting the sampling frequency when the sampling frequency of the digit...
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