For a file(.wave) • Find the sampling frequency and the number of bits per sample. • Re-quantize the samples using the following methods: o Linear Quantization o A-Law Companding with A=87.6 o μ-Law Companding with μ=255 •

DDS 由相位增量器，相位累加器，量化器以及正余弦查找表四部分组成。 相位累加器每一周期会累加上固定的相位值，然后从查找表中找到对应的数值。-DDS by the phase increment, phase accumulator, quantizer and sine and cosine lookup table of four parts. The phase accumulator accumulates a fixed phase value for each period,