Listening to FreeDV Digital Speech with an RTL-SDR
Over on YouTube user BSoD Badgers has uploaded a video showing his reception of FreeDV digital speech at 14 MHz. He uses SDR# combined with the FreeDV software to decode the signal.
FreeDV is a open source software application that allows digital speech to be sent at HF frequencies in a 1.25 kHz wide signal. The same software can be used on the receiving end to decode the signal into speech.
This the mode is better for the voice cw, same like the old Coherent CW.
The compression makes him sound an awful lot like a speak and spell 🙂
Its a fun little mode, but catching it in the wild is uncommon as its not widely used. and the fact that we can do it with a cheap stick from china and an upconvertor makes it just that more fun! 😀
Impressive stuff at such a low bitrate!