最終更新:2011-03-13 (日) 21:27:33 (4786d)
Speex
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A Free Codec For Free Speech
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?)
- Fixed-point port
- Acoustic echo canceller
- Noise suppression
