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WinDRM, the best sounding program, uses2.5 kHz of spectrum.
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Pearce said these three programs all allow hams to transmit and receivedigital voice by connecting their PC sound card to an ordinary SSBtransceiver: "The result has been surprisingly high quality audio, withvirtually no noise - sort of like listening to FM, but in the narrowbandwidth of a sideband signal. WinDRM could always use the open-source Speex codec, butFDMDV users will need to download the new version." "Lanza did a quick rewrite to usean open-source codec, and now WinDRM and FDMDV are back," Pearce said."DRMDV, an intermediate program between the other two, has beenabandoned. WinDRM, DRMDV and FDMDV, all written by Cesco Lanza, HB9TLK, used acodec that was developed for the US Department of Defense and NATO.Rights to various forms of the codec are held by several companies.According to Gary Pearce, KN4AQ, the companies have "winked" at hamradio use for several years, but a recent complaint caused the programsto be pulled from the download site.
Open source ambe codec software#
HF Digital Voice Programs Once Again Available for Download:Ĭiting codec (coding/decoding) licensing issues, three free Windowsprograms for sound card-based HF digital voice were yanked from theirdownload site for a short time recently, surprising hams who areinterested in HF digital voice operation several online groups thatsupported the software were also closed for a short time.