Three Videos On Codec2 and Open Hardware

Bruce Perens writes "Codec2 is the Open Source ultra-low-bandwidth speech codec capable of encoding voice in 1200 Baud. FreeDV (freedv .org) is an HF (global-range radio) implementation that uses half the bandwidth of SSB, and without the noise. Here are three speeches about where it's going."

• David Rowe: Embedding Codec2: Open Source speech coding on a low-cost microprocessor, at Linux.conf.au 2014. YouTube, downloadable MP4.
• Bruce Perens: FreeDV, Codec2, and HT of the Future (how we're building a software-defined walkie-talkie that's smarter than a smartphone), at the TAPR/ARRL Digital Communications Conference 2013. Blip.tv, YouTube
• Chris Testa on the .Whitebox handheld software-defined radio design that is the RF portion of HT of the Future, which was also shown at the TAPR conference.

Comments

Code2 voice sample @4:50

[bill_mcgonigle]

http://www.youtube.com/watch?v=u4svoub6XcE&t=4m50s

This is pretty neat. Some high school friends and I were attempting to get voice working over 2400 baud c. 1990 (we wanted Internet phones). We never even came close, and thought we'd have to do phoenmic deconstruction to get that kind of data rate. This is pretty amazing for 1200 baud, even if it is almost 25 years later.