Differential pulse-code modulation

A signal encoder that uses prediction of the samples of the signal in addition to pulse-code modulation (PCM).

Differential pulse-code modulation (DPCM) is a signal encoder that uses the baseline of pulse-code modulation (PCM) but adds some functionalities based on the prediction of the samples of the signal. The input can be an analog signal or a digital signal.

If the input is a continuous-time analog signal, it needs to be sampled first so that a discrete-time signal is an input to the DPCM encoder.

  • Option 1: take the values of two consecutive samples; if they are analog samples, quantize them; calculate the difference between the first one and the next; the output is the difference.
  • Option 2: instead of taking a difference relative to a previous input sample, take the difference relative to the output of a local model of the decoder process; in this option, the difference can be quantized, which allows a good way to incorporate a controlled loss in the encoding.

Applying one of these two processes, short-term redundancy (positive correlation of nearby values) of the signal is eliminated; compression ratios on the order of 2 to 4 can be achieved if differences are subsequently entropy-coded because the entropy of the difference signal is much smaller than that of the original discrete signal treated as independent samples.

DPCM was invented by C. Chapin Cutler at Bell Labs in 1950; his patent includes both methods.

Differential pulse-code modulation
  • DPCM
  • Basics and Advantages of DPCM Differential Pulse Code Modulation in Digital Communication on youtube.com
  • What are the advantages and disadvantages of DPCM (differential pulse code modulation)?  on quora.com
  • Pulse Code Modulation (PCM) Vs Differential Pulse Code Modulation (DPCM) on engineeringmadeeasypro.com
  • Pulse Code Modulation on sciencedirect.com
  • Explain Differential Pulse Code Modulation on electronicspost.com
Adapted from content published on wikipedia.org
  • Image By C. Chapin Cutler and his agent - U. S. patent 2605361, Public Domain — from wikimedia.org
Last modified on October 21, 2020, 10:48 pm
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