Quantization effects in direct-form FIR filters Consider a direct-form realization of an FIR filter of length M. Suppose that the multiplication of each coefficient with the corresponding signal sample is performed in fixed-point arithmetic with b bits and each product is rounded to b bits. Determine the variance of the quantization noise at the output of the filter by using a statistical characterization of the round-off noise as in Section 9.6.3.
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