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Article | REF: AF490 V1

Mathematical methods for signal and image treatment

Author: Bruno TORRÉSANI

Publication date: October 10, 2011 | Lire en français

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    4. Application example: signal coding and compression

    Signal coding is an area of signal processing that has undergone fundamental developments over the last twenty years. From PCM (which is a simple application of the sampling theorem and quantization) to the most recent sound and image encoders, considerable progress has been made, leading to extremely efficient signal and image coding formats.

    4.1 PCM

    The ancestor of encoders is PCM (an acronym for Pulse Code Modulation). PCM was widely used for digital telephony and electronic music keyboards in the 1980s. It is also the standard used for audio CDs. The idea behind PCM is to successively sample an analog signal at a fixed frequency, then quantize the samples, i.e. approximate them to a finite precision, coded on a fixed number of bits. More precisely, the PCM...

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