G. how also boasts 711 PCM?

CodePudding user response:

PCM Pulse Code Modulation is the abbreviation of Pulse Code Modulation, Pulse Code Modulation is one of the encoding of digital communication, the main process is to voice, image and so on analog signal sampling at regular intervals, make its discretization, and the sampling value according to the hierarchical unit rounded integer quantization, and the sampling value according to a set of binary Code to represent the sampling Pulse amplitude,

PCM is original format without any compressed voice, similar to the bitmap BMP format

G. 711 is a set by the international telecommunication union (ITU - T) of the audio encoding, also known as the ITU -t g. 711, divided into alaw, and ulaw. Similar to a graphics file PNG format, 711 compression is very small, a 50% compression.

CodePudding user response:

PCM is an analog signal digital process, the analog signal sampling, quantization, coding and modulation
The coding part is one of the simplest G711 coding format, G711 is divided into A law and U law, American states in using U, used in China, is A law