Speex is an Open Source / Free Software patent-free audio compression format designed for speech.
The Speex project aims to lower the hurdle for voice applications by providing a free alternative to expensive proprietary codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs.
Speex is a useful audio compression utility that will come in handy. Speex is on CELP and is designed to compress voice at bitrates between 2 to 44 kbps.
Speex main features:
# Narrowband (8 kHz), wideband (16 kHz) and ultra-wideband (32 kHz) compression in the same bitstream
# Intensity stereo coding
# Packet loss concealment
# Variable bitrate operation (VBR)
# Voice Activity Detection (VAD)
# Discontinuous transmission (DTX)
# Fixed-Point Port
# Acoustic echo cancellation
# Noise Reduction
Note that Speex a number of features that are not in other codecs such as intensity stereo encoding, integration of multiple sampling rates in the same bitstream (embedded coding), and a VBR mode.
What's new in Speex:
# All non-codec components (preprocessor, echo cancellation, jitter buffer) have moved a new library libspeexdsp
# New jitter buffer algorithm and resampler improvements / fixes
# First Release can be built where libspeex without floating point support
The Speex project aims to lower the hurdle for voice applications by providing a free alternative to expensive proprietary codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs.
Speex is a useful audio compression utility that will come in handy. Speex is on CELP and is designed to compress voice at bitrates between 2 to 44 kbps.
Speex main features:
# Narrowband (8 kHz), wideband (16 kHz) and ultra-wideband (32 kHz) compression in the same bitstream
# Intensity stereo coding
# Packet loss concealment
# Variable bitrate operation (VBR)
# Voice Activity Detection (VAD)
# Discontinuous transmission (DTX)
# Fixed-Point Port
# Acoustic echo cancellation
# Noise Reduction
Note that Speex a number of features that are not in other codecs such as intensity stereo encoding, integration of multiple sampling rates in the same bitstream (embedded coding), and a VBR mode.
What's new in Speex:
# All non-codec components (preprocessor, echo cancellation, jitter buffer) have moved a new library libspeexdsp
# New jitter buffer algorithm and resampler improvements / fixes
# First Release can be built where libspeex without floating point support
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