Speex
Details
| Last Update: | 2008-02-04 23:01:04 |
| Version: | 1.0.5 / 1.2 Beta |
| License/Program Type: | BSD License |
| Publisher: | Jean-Marc Valin |
| Price: | $0.00 |
Description:
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.
Speex project is released under the Xiph.org variant of the BSD
license and it is part of the GNU Project.
Speex is based on CELP and is designed to compress voice at
bitrates ranging from 2 to 44 kbps.
Here are some key features of
"Speex":
· 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.
What's New in 1.2 Beta 3 Development Release:
· 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).
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