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Speex: a free codec for free speech
Finally, Speex is part of the GNU Project and is available under the revised BSD license. 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
Speex Audio Codec, Version 1.2
https://www.loc.gov/preservation/digital/formats/fdd/fdd000259.shtml
Speex is designed for three different sampling rates: 8 kHz, 16 kHz, and 32 kHz, referred to as narrowband (telephone quality), wideband, and ultra-wideband. The encoding process is controlled most of the time by a quality parameter that ranges from 0 to 10.
Wideband Speech Coder Audio Examples - VOCAL
https://www.vocal.com/audio-examples/wideband-speech-coder-audio-examples/
Wideband Speech Coder Audio Examples. Audio examples are provided for VOCAL’s wideband speech coders. Reference PCM sample file. Speex 2.15k bps (8kHz) Speex 3.95k bps (8kHz) Speex 5.95k bps (8kHz) Speex 11k bps (8kHz) Speex 15k bps (8kHz) Speex 18.2k bps (8kHz)
Speex WideBand: How to ? | Microchip
https://www.microchip.com/forums/m537451.aspx
Speex WideBand: How to ? Hi, I have dowloaded: Audio Library – SPEEX, ADPCM, WAV In the help, it is specified: Codec band: narrow/wide (wide band available if …
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