The bandwidth required in DPCM is less than that of PCM beca

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The bandwidth required in DPCM is less than that of PCM because

[ESE 2019 Paper 2 (Technical) ECE]

A the number of bits per code is reduced resulting in a reduced bit rate

B the difference signal is larger in amplitude than actual signal

C more quantization levels are needed

D the successive samples of signal often differ in amplitude