Explain the concept of Differential Pulse Code Modulation (DPCM) and i

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Module 5: Pulse Modulation-II

20247m

Explain the concept of Differential Pulse Code Modulation (DPCM) and its advantages over PCM.

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Answer

DPCM: Quantize difference $d[n]=x[n]-\hat{x}[n]$ , predictor $\hat{x}=a_1\tilde{x}[n-1]$ . Block $x$ →subtract predictor→Quantizer→Encoder→Channel→Decoder→predictor loop. Variance of $d$ << variance of $x$ → fewer bits, prediction gain $G_p=\sigma_x^2/\sigma_d^2$ . Better SNR for correlated speech/video vs PCM.

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