WidebandSpeech

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WidebandSpeech umts

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Wideband Speech Coding Standards and Applications
A White paper
Abstract
Increasing the bandwidth of sound signals from the telephone bandwidth of 200-3400 Hz to the
wider bandwidth of 50-7000 Hz results in increased intelligibility and naturalness of speech and
creates a feeling of transparent communication. Emerging end-to-end digital communication
systems enable the use of wideband speech coding in numerous and diverse applications. In
recognition of the need for high-quality wideband speech codecs, several standardization
activities have been conducted recently, resulting in the selection of a new wideband speech
codec, AMR-WB, at bit rates from 6.6 to 23.85 kbit/s by both 3GPP and ITU-T. The adoption of
AMR-WB by the two bodies is of significant importance because for the first time the same codec
will be adopted for wireless as well as wireline services. This will eliminate the need for
transcoding and ease the implementation of wideband voice applications and services across a
wide range of communication systems and equipment.
This document presents a summary of wideband speech coding standards for wideband
telephony applications. The quality advantages and applications of wideband speech coding are
first presented, and then the issue of telephony over packet networks is discussed. Several
wideband speech coding standards are discussed, and special emphasis is given to the AMR-WB
standard recently selected by 3GPP and ITU-T.

[ahmadleb3]

thanks , really interesting. Ill read in details about it
.