Jean-Marc Valin has a B.S., M.S., and Ph.D. in Electrical Engineering from the University of Sherbrooke. He is the primary author of the Speex codec and one of the main authors of the Opus codec, both of which provide a free alternative to patented, proprietary audio codecs. He has also contributed to the Daala and…
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Ever since version 1.1, Opus has been able to automatically detect whether its input is speech or music, and choose the optimal encoding mode accordingly. The original speech/music detector was based on a simple (non-recurrent) neural network, followed by an HMM-based layer to combine the neural network results over…