CODEC 2 Open source speech coding at 2400 bit/s and below
What’s CODEC 2? In this video from the 2011 Digital Communications Conference held last September in Baltimore, MD, David Rowe, Australian Amateur Radio operator VK5DGR, detailed his work on an open-source, low bit-rate CODEC for Digital Voice for Amateur Radio. It’s presently in the Alpha testing stage.
More information on this codec as well as a link to the source code can be found at the CODEC2 website.
This entry was posted in digital radio data, open source and tagged amateur radio, CODEC 2, speech coding.
Comments
This is extremely cool stuff.
I believe there has been some progress since the presentation was recorded, and the codec has indeed hit the 2400 bit/sec mark – and there are even samples of the codec running at 1200 bit/sec on its site. At half the data rate, speech sounds pretty robotic; no surprise perhaps, but it is very impressive that it is intelligible at all.
Interesting.
For everyone who is interested in audio codecs:
http://opus-codec.org/
Opus is an free (no royalties) and open standard in development for audio.
It’s made by Xiph.org which is a non profit who tries to make free multimedia formats happen:
From: http://xiph.org/about/