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 RC1 Development Release:
· 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.
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