Speex

From Hydrogenaudio Knowledgebase
Revision as of 21:28, 27 January 2022 by Porcuswiki (talk | contribs) (Speex obsoleted by Opus. Category.)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Speex is a legacy Open Source/Free Software patent-free audio codec designed for speech. It is obsoleted by Opus.


Technical Information

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)
  • In-progress fixed-point port
  • Echo Cancellation (experimental)
  • Vorbis psychoacoustics model (experimental)

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.

References

The above information was copied from the Speex home page.

Retrieved from "https://wiki.hydrogenaud.io/index.php?title=Speex&oldid=35465"