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Speex

Project Release infomations and Project Resources. Note that these informations are from this projects Freecode.com page and the downloads themselves may not be hosted with SourceForge.JP.

Project Release Information

2008-07-24 20:29
This release adds support for acoustic echo cancellation with multiple microphones and multiple loudspeakers. It also adds an API for decorrelating loudspeaker signals to improve multi-channel performance. A few bugs were fixed in the echo canceller, jitter buffer, and preprocessor. At this point, the API for 1.2 should be stable and only a few very minor additions are planned.
2008-02-04 23:01
The most obvious change in this release is that all the non-codec components (preprocessor, echo cancellation, and jitter buffer) have been moved to a new libspeexdsp library. Other changes include a new jitter buffer algorithm and resampler improvements/fixes. This is also the first release where libspeex can be built without any floating point support. To do this, the float compatibility API must be disabled (--disable-float-api or DISABLE_FLOAT_API) and the VBR feature must be disabled (--disable-vbr or DISABLE_VBR).
2007-05-24 16:15
The RAM requirement for wideband has gone down
drastically (by more than two times). A new
resampler module has been added, providing fast
arbitrary sampling rate conversion. The echo
canceller has also been improved. A bug in
1.2beta1 that made the echo canceller unstable has
been fixed. The echo canceller should now converge
faster, and should be robust and tolerant of
incorrect capture-playback synchronization. The
preprocessor has also been greatly improved. Not
only should the quality be better, but it is now
fully converted to fixed-point. At last, early
TriMedia support (incomplete) has been merged.
2006-09-04 19:27
This release brings many significant improvements. The quality has been improved at the encoder and the decoder. This includes enhancer improvements, high-pass filters, and fixes for minor regressions in previous 1.1.x releases. Memory use has been greatly reduced (more than 50%), especially for fixed-point and narrowband. In general, CPU requirements have gone down and the Blackfin port has been sped up significantly. Non-codec improvements include an extension to the echo canceller API and a Speex-independent version of the jitter buffer. The echo canceller is also more robust.
2006-03-13 07:12
The main improvement in this release is that the
echo canceller has now been converted to
fixed-point arithmetic. The experimental
Vorbis-based masking model (use
--enable-vorbis-psy as an argument to the
configure script) has also been improved and is
now better and actually usable. Several other bugs
have also been fixed.

Project Resources

http://freecode.com/urls/76f7e1fdbba002e6f3b88ddcaffb13c1
http://freecode.com/urls/21fae945b0b8aeeee1b6cbac8d1dc9e3
http://freecode.com/projects/speex

Project Description

Speex is a patent-free compression format designed especially for speech. It is specialized for voice communications at low bit-rates in the 2-45 kbps range. Possible applications include Voice over IP (VoIP), Internet audio streaming, audio books, and archiving of speech data (e.g. voice mail).