- J.-M. Valin, Opus, the Swiss army knife of Audio Codecs, Linux.Conf.Au, 2012.
- J.-M. Valin, The Opus Codec, ClueCon, 2012 (slides).
- J.-M. Valin, Speex: A Free Codec for Free Speech. Linux.Conf.Au, 2006 (slides).
- J.-M. Valin, Speex: Speech Compression for Everyone, Invited presentation at the Libre Software Meeting 2003 in Metz, France.
Fields of interest
- Speech coding
- Signal processing
- Network multimedia applications
- Mobile robotics
- Artificial intelligence
- Real-time systems
Opus (Core Author)
An open source audio codec providing high-quality full-band speech and audio
(up to 48 kHz) at bitrates ranging from 6 to 512 kbit/s
Speex (Project lead, main author)
Speex is an open source (BSD-licensed) audio codec that is optimised for voice.
Unlike other codecs like MP3 and Ogg
Vorbis, Speex is specially
designed for compressing voice at low bit-rates for applications such
as voice over IP (VoIP). It uses the Ogg container format and is meant to
be complementary to the Vorbis codec.
FlowDesigner is a free (LGPL) "data flow oriented" development environment. It
can be use to build complex applications by combining small, reusable building
blocks. In some way, it has similarities with Simulink and LabView, although
it is not designed (and far) to be a "clone" of any of them. So far, it has
been used for tasks like signal and speech processing, neural networks, vector
quantization, fuzzy logic and robotics.
ManyEars provides FlowDesigner building-blocks for microphone array processing.
This includes sound source localisation, tracking and separation.