Speex is an Open Source/Free Software  patent-free audio compression format
designed for speech. The Speex Project aims to lower the barrier of entry for
voice applications by providing a free alternative to expensive proprietary
speech codecs. Moreover, Speex is well-adapted to Internet applications and
provides useful features that are not present in most other codecs. Finally,
Speex is part of the GNU  Project and is available under the Xiph.org variant of
the BSD license.
The Technology

Speex is based on CELP and is designed to compress voice at bitrates ranging
from 2 to 44 kbps. Some of Speex’s features include:

    * Narrowband (8 kHz), wideband (16 kHz), and ultra-wideband (32 kHz)
compression in the same bitstream
    * Intensity stereo encoding
    * Packet loss concealment
    * Variable bitrate operation (VBR)
    * Voice Activity Detection (VAD)
    * Discontinuous Transmission (DTX)
    * In-progress fixed-point port

Note that Speex has a number of features that aren’t in other codecs such
as intensity stereo encoding, integration of multiple sampling rates in the same
bitstream, and a VBR mode

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16-12-2005 - First version. Newlib and Clib2 version included

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