In a PCM system, if N is the number of levels and Z is the step size, then mean square quantization error is given by:
A. $$\frac{{{\text{NZ}}}}{{12}}$$
B. $$\frac{{{{\text{Z}}^2}}}{{12}}$$
C. $$\frac{{{{\text{Z}}^2}}}{{12{\text{N}}}}$$
D. $$\frac{{{\text{N}}{{\text{Z}}^2}}}{{12}}$$
Answer: Option B
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