| http://www.w3.org/ns/prov#value | - In the random noise generator circuit 9 shown in FIG. 13, when the switch SW is switched over to the contact ???a??? thereof, a digital audio signal (which is a signal having the decreased quantization number) generated by further re-quantizing a digital audio signal quantized by the oversampling type low-pass filter 1 is outputted to the adder 2 and the higher harmonic wave generator 3.
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