Pulse Code Modulation - definizione. Che cos'è Pulse Code Modulation
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Cosa (chi) è Pulse Code Modulation - definizione

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

Pulse Code Modulation         
  • Sampling and quantization of a signal (red) for 4-bit LPCM over a time domain at specific frequency.
DIGITAL REPRESENTATION OF SAMPLED ANALOG SIGNALS
Pulse Code Modulation; Lpcm; Linear pcm; Linear pulse-code modulation; Linear PCM; Adaptive Differential PCM; Pulse-code modulated; PCM; LPCM; Linear Pulse Code Modulation; Adapted Differential Pulse Code Modulation; PCM audio; PCM synthesis; Pulse code modulation; Linear pulse code modulation; Pcm; P.C.M.; Pulse-code-modulated; Pulse-code-modulation
<data> (PCM) A method by which an audio signal is represented as digital data. Virtually all digital audio systems use PCM, including, CD, DAT, F1 format, 1630 format, DASH, DCC, and MD. Many people get confused because "PCM" is also slang for Sony's F1 format which stores PCM digital audio on videotape. (1995-02-09)
pulse code modulation         
  • Sampling and quantization of a signal (red) for 4-bit LPCM over a time domain at specific frequency.
DIGITAL REPRESENTATION OF SAMPLED ANALOG SIGNALS
Pulse Code Modulation; Lpcm; Linear pcm; Linear pulse-code modulation; Linear PCM; Adaptive Differential PCM; Pulse-code modulated; PCM; LPCM; Linear Pulse Code Modulation; Adapted Differential Pulse Code Modulation; PCM audio; PCM synthesis; Pulse code modulation; Linear pulse code modulation; Pcm; P.C.M.; Pulse-code-modulated; Pulse-code-modulation
¦ noun Electronics a technique of modulating the amplitude of an analogue signal to represent digital information as a series of pulses.
PCM         
  • Sampling and quantization of a signal (red) for 4-bit LPCM over a time domain at specific frequency.
DIGITAL REPRESENTATION OF SAMPLED ANALOG SIGNALS
Pulse Code Modulation; Lpcm; Linear pcm; Linear pulse-code modulation; Linear PCM; Adaptive Differential PCM; Pulse-code modulated; PCM; LPCM; Linear Pulse Code Modulation; Adapted Differential Pulse Code Modulation; PCM audio; PCM synthesis; Pulse code modulation; Linear pulse code modulation; Pcm; P.C.M.; Pulse-code-modulated; Pulse-code-modulation
1. <data> Pulse Code Modulation. 2. <company> Plug Compatible Manufacturer. (2003-06-24)

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.