ARLA/CLUSTER: Primeiros testes "On-Air" da versão FreeDV 2020

[João Costa > CT1FBF]

First on-air test of FreeDV 2020

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).

Read the full post and watch the video at
http://www.rowetel.com/?p=6747

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