ZyXEL omni.net Plus User Guide - Page 23

but with voice quality degradation. Only 4-bit ADPCM is used in the Omni 56K Plus.

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Omni 56K Plus Series User's Guide 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. Only 4-bit ADPCM is used in the Omni 56K Plus. Specifications and Function Description 2-11

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Omni 56K Plus Series User’s Guide
Specifications and Function Description
2-11
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. Only 4-bit ADPCM is used in the Omni 56K Plus.