How does ADPCM work?

How does ADPCM work?

The principle of ADPCM is to use your knowledge of the signal in the past time to predict it in the future, the resulting signal being the error of this prediction. Applications of this principle are all based on digital transcoding after converting and coding analog signal to digital using pulse code modulation (PCM).

What is ADPCM used for?

ADPCM is used to send sound on fiber-optic long-distance lines as well as to store sound along with text, images, and code on a CD-ROM.

What is ADPCM in digital communication?

ADPCM stands for Adaptive Differential Pulse-Code Modulation, is a technique for converting analog sound, such as speech, into binary digital information by frequently sampling the sound and expressing its modulation in binary form.

What is ADPCM in multimedia?

Adaptive differential pulse code modulation (ADPCM) is a method used to convert analog signals to binary signals. The technique converts the analog signals by taking frequent samples of the sound and representing the value of the sampled modulation in binary form.

How is the ADPCM algorithm used in PCM?

An ADPCM algorithm is used to map a series of 8 bit μ-law (or a-law) PCM samples into a series of 4 bit ADPCM samples. In this way, the capacity of the line is doubled.

How is ADPCM used to encode speech?

Instead of encoding the speech sample, ADPCM encodes the difference between a predicted sample and the speech sample. This method provides more efficient compression with a reduction in the number of bits per sample, yet preserves the overall quality of the speech signal.

How is adaptive pulse code modulation ( ADPCM ) used?

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…

How to reduce file size with ffmpeg ADPCM?

It is a way to reduce the file size. The Windows Sound System supported ADPCM in WAV files. The corresponding FFmpeg audio codecs are adpcm_ima_qt, adpcm_ima_wav, adpcm_ms, adpcm_swf and adpcm_yamaha. ^ Ken C. Pohlmann (2005). Principles of Digital Audio. McGraw-Hill Professional. ISBN 978-0-07-144156-8.