Zyxel-communications Omni 56K II Manuel d'utilisateur télécharger pdf (Page 41)

Omni 56K II and Omni 56K Plus II User’s Guide

Specifications and Functions 3-13

3.18.2 4-bit Voice Data Compression

The main issue in the digitized voice mode is the amount of storage required. A relatively simple ADPCM

algorithm can reduce the speech data rate to half the rate and maintain about the same voice quality. This

algorithm can also be used to reduce the speech data rate to 1/3 or 1/4 of the original rate, but with voice

quality degradation. 4-bit ADPCM is used in the Omni 56K II and Omni 56K Plus II modems.

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Zyxel-communications Omni 56K II Manuel d'utilisateur Page 41