Full Form of ADPCM

What is ADPCM Full Form?

ADPCM full form is Adaptive Differential Pulse Code Modulation.

What is Adaptive Differential Pulse Code Modulation?

Adaptive differential pulse-code modulation (ADPCM) is a variant of differential pulse-code modulation (DPCM) that varies the size of the quantization step, to allow further reduction of the required data bandwidth for a given signal-to-noise ratio.

Typically, the adaptation to signal statistics in ADPCM consists simply of an adaptive scale factor before quantizing the difference in the DPCM encoder.

ADPCM was developed for speech coding by P. Cummiskey, Nikil S. Jayant and James L. Flanagan at Bell Labs in 1973

ADPCM (Adaptive Differential Pulse Code Modulation) is also known as Delta Pulse Code Modulation. For a signal, it is a compression coding using differential values like DPCM or Differential Pulse Code Modulation, where the quantization stages scaling is adapted additionally based on the signal curve
This modulation is used in the structure of a variety of ITU-T standards like G.726 in audio signals.

In these applications, the data rate of the output can be adjusted dynamically among 16 kbit/s & 64 kbit/s. Another example of this is DECT (Digital Enhanced Cordless Telecommunications) which is used in cordless telephones. The ADPCM uses the signal performance in the past and predicts it in the future and the output signal will signify the prediction error, which has no importance.

So, the signal should be decoded to restore a strong and original signal. The main function of ADPCM is to transmit sound signals with the help of fiber-optic long-distance lines. This modulation is very helpful particularly for associations that arrange digital lines among remote sites for transmitting both voices as well as data. Before they transmitted, the voice signals are digitized

The ADPCM method is mainly used in the telecommunication field for compression of speech because this technique will reduce the flow of bit without reducing its quality. This kind of modulation can be used in all waveforms, images, and audio with high-quality & data in other moderns.