differential PCM - traduzione in russo
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differential PCM - traduzione in russo

SIGNAL ENCODER
Differential Pulse Code Modulation; Differential PCM; Differential pulse code modulation; Dpcm; DPCM

differential PCM         

общая лексика

кодо-импульсная модуляция

differential pulse-code modulation         
дифференциальная импульсно-кодовая модуляция
differential pulse code modulation         
See: DPCM

Definizione

High Voltage Differential
<hardware> (HVD) Differential SCSI scheme that has been in use for years. The terminators run on 5 Volts DC. See also LVD. (1999-02-16)

Wikipedia

Differential pulse-code modulation

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.
  • 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.

Traduzione di &#39differential PCM&#39 in Russo