最終更新:2011-03-13 (日) 21:27:33 (3312d)  

Speex
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A Free Codec For Free Speech

http://www.speex.org/

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