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diff --git a/ham/freedv/README b/ham/freedv/README new file mode 100644 index 0000000000000..a300f26833d9d --- /dev/null +++ b/ham/freedv/README @@ -0,0 +1,19 @@ +FreeDV is a Digital Voice mode for HF radio. + +You can run FreeDV using a free GUI application for Windows, Linux and +OSX that allows any SSB radio to be used for low bit rate digital +voice. Alternatively you can buy a SM1000 FreeDV adaptor that allows you +to run FreeDV on any HF radio without a PC or sound card. + +Speech is compressed down to 700-1600 bit/s then modulated onto a +.25 kHz wide signal comprised of 16 QPSK carriers which is sent to the +Mic input of a SSB radio. The signal is received by an SSB radio, then +demodulated and decoded by FreeDV. FreeDV 700C is approaching SSB in +its low SNR performance. At high SNRs FreeDV 1600 sounds like FM, +with no annoying analog HF radio noise. + +FreeDV was built by an international team of Radio Amateurs working +together on coding, design, user interface and testing. +FreeDV is open source software, released under the GNU Public License +version 2.1. The modems and Codec 2 speech codec used in FreeDV are +also open source. |