Speex in Voice over IP
MP4 | English | 640×480 | AVC ~342 kbps | AAC 125 kbps | 48.0 KHz | 287 MB
Genre: eLearning
Jean-Marc Valin has a PhD, a master’s degree and a bachelor’s degree in electrical engineering from the University of Sherbrooke.
His PhD thesis focuses on bringing hearing capabilities to a mobile robotics platform, including sound source localization and separation. His other research interests cover speech coding and he has developed the Speex codec, aimed at low bitrate speech communications. He is a member of the IEEE Signal Processing Society.
Speex is an Open Source/Free Software patent-free audio compression format designed for speech. The Speex Project aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs. Finally, Speex is part of the GNU Project and is available under the revised BSD license.
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:
Home: http://xyznv.com
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
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http://www.filesonic.com/file/125232561/FOSDEM2006-speex.avi
