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