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- Q1224367 subject Q6892398.
- Q1224367 abstract "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 the 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, and it can be further entropy coded. 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.".
- Q1224367 thumbnail Cutler_DPCM_patent.png?width=300.
- Q1224367 wikiPageWikiLink Q1184820.
- Q1224367 wikiPageWikiLink Q1345239.
- Q1224367 wikiPageWikiLink Q15963867.
- Q1224367 wikiPageWikiLink Q163461.
- Q1224367 wikiPageWikiLink Q170474.
- Q1224367 wikiPageWikiLink Q174948.
- Q1224367 wikiPageWikiLink Q175022.
- Q1224367 wikiPageWikiLink Q175049.
- Q1224367 wikiPageWikiLink Q198099.
- Q1224367 wikiPageWikiLink Q209934.
- Q1224367 wikiPageWikiLink Q210868.
- Q1224367 wikiPageWikiLink Q217365.
- Q1224367 wikiPageWikiLink Q2869.
- Q1224367 wikiPageWikiLink Q5006349.
- Q1224367 wikiPageWikiLink Q6892398.
- Q1224367 comment "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 the input to the DPCM encoder.".
- Q1224367 label "Differential pulse-code modulation".
- Q1224367 depiction Cutler_DPCM_patent.png.