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.
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.