Suppose we are sampling and quantizing a signal using DPCM lossy coding. Assume that the variance of the difference d(n) is
100 times less than the variance of the signal. What is the quantization SNR if we quantize d(n) with 16 bits per sample? How
many bits per sample are needed to ensure that the quantization SNR stays above 70 dB? (Recall how to compute SNR and its
measurement unit. Also recall the relationship between SNR and the quantization bit.)