In PCM, if the number of quantization levels is increased

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In PCM, if the number of quantization levels is increased from 4 to 64, then the bandwidth requirement will approximately be—

1. 3 times
2. 4 times
3. 8 times
4. 16 times

Correct Option: A

Given that quantization levels are increased from 4 to 64, then corresponding no. of bit increase from 2 to 6.
Since L = 2ⁿ; when L = 4 = 2ⁿ then n = 2 and when L = 64 = 2ⁿ then n = 6

BW =	nf_s
	2

Hence bandwidth requirement will be =	6	= 3 times more.
	2