David Rowe VK5DGR reports on the first on-air tests of the new digital voice mode FreeDV 2020

Brad (AC0ZJ), Richard (KF5OIM) and I have been putting the pieces required for the new FreeDV 2020 mode, which uses LPCNet Neural Net speech synthesis technology developed by Jean-Marc Valin. The goal of this mode is 8kHz audio bandwidth in just 1600 Hz of RF bandwidth. FreeDV 2020 is designed for HF channels where SSB an “armchair copy” – SNRs of better than 10dB and slow fading.

Mark, VK5QI has made a 3200km FreeDV transmission from Adelaide, South Australia to a KiwiSDR in the Bay of Islands, New Zealand. He decoded it with the partially working OSX version (we do most of our development on Ubuntu Linux).

More Inforamtion - http://www.rowetel.com/?p=6747

Codec2 mailing list - https://sourceforge.net/p/freetel/mailman/freetel-codec2/