Q8. In voice communication, quantisation and coding process converts the analog value into a digital value. Assuming a standard word size is 8 bits, which of the following correctly represents the bandwidth requirement of 64kbps for voice transmission in digital form?
A. 2 x 8 kHz x 4-bit code words
B. 1x8 kHz x 8-bit code words
C. 3 x 4 kHz x 8-bit code words
D. 2 x 4-bit code words x 8 kHz
Correct Answer: D
In analog telephone network, the maximum voice frequency is limited to 4 kHz. For faithful reproduction of voice signals, the same need to be sampled at twice the maximum frequency. Further, each sample is coded with 8-bit word, which allows for 256 distinct quantisation intervals. The rate then becomes the sampling rate times the size of the codeword (2 * 4 kHz * 8 bits = 64 kbps).
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