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To contact Stan, send him e-mail or add comments to his blog. Mel, myself and the ham radio digital voice community wish David the best of luck in succeeding.Д®ditorвЂ™s note: Stan Horzepa, WA1LOU, prefers his digital voice over his analog voice. A challenging task, to say the least, but David believes it is doable.вЂќ DavidвЂ™s goal is to provide a codec with speech quality performance between LPC and MELP/AMBE without infringing upon any of their patents.

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Visit the DavidвЂ™s Codec 2 Web page to download the software and learn more - including how it works.ДЄccording to digital voice expert Mel Whitten, K0PFX, in TAPRвЂ™s Packet Status Register, вЂњCodec2 will fill the need for a low bit rate speech codec with an open source codec for HF/VHF DV applications.

V0.1 alpha is a fully functional 2550 bit/s codec (51 bits/frame at a 20-ms frame rate). Tip-toeing around the patented parts of the algorithms the LAME encoder was developed as free software application used to encode audio into.

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It is released under the GNU Lesser General Public License (LGPL).вЂќ It fills a gap in open source, free-as-in-speech voice codecs beneath 5000 bit/s. Applications include low bandwidth HF/VHF digital radio. One year later, David announced the Version 0.1 alpha release: вЂњCodec2 is an open source, low bit rate speech codec designed for communications quality speech at around 2400 bit/s. One year ago, David Rowe, VK5DGR, decided to begin work on a free, low bit rate speech codec with an initial target of communications quality speech at 2400 bit/s. Digital voice users have been waiting and hoping for someone to concentrate on developing a codec optimized for ham radio use, but none has been forthcoming.' FDMDV and WinDRM can both be downloaded from Jason Buchanan's, N1SU.The AOR digital voice modems and D-STAR radios both use the AMBE 2020 vocoder, and are not affected with the coding changes the AMBE 2020 vocoder is a proprietary chip that is embedded in each unit.For more information on WinDRM, check out QST Editor Steve Ford's, WB8IMY, article 'Life Could Be a DReaM,' pages 38-40 in the April 2007 issue of QST.This week, SurfinвЂ™ looks at the results of one year of codesmithing on the digital voice front. So the on-air audio might suffer some with the new version. FDMDV works with weaker signals than WinDRM.' Pearce said that none of the available open-source codecs work as well as the old one: ', or Mixed Excitation Linear Prediction, was designed specifically for high-quality, low data-rate voice communication. The main problem with HF digital voice is that it needs fairly strong signals.

They both use OFDM modulation, a set of close-spaced carriers that are each modulated with a little bit of data to add up to the final digital signal. 220 please feel free to email me direct w/questions. FDMDV sounds a little rougher, but uses only 1.1 kHz of spectrum. With the addition of a software AMBE halfrate encoder the OP25 Group now releases an updated TX. WinDRM, the best sounding program, uses 2.5 kHz of spectrum.

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WinDRM could always use the open-source Speex codec, but FDMDV users will need to download the new version.' Pearce said these three programs all allow hams to transmit and receive digital voice by connecting their PC sound card to an ordinary SSB transceiver: 'The result has been surprisingly high quality audio, with virtually no noise - sort of like listening to FM, but in the narrow bandwidth of a sideband signal.

' DRMDV, an intermediate program between the other two, has been abandoned. 'Lanza did a quick rewrite to use an open-source codec, and now WinDRM and FDMDV are back,' Pearce said. According to Gary Pearce, KN4AQ, the companies have 'winked' at ham radio use for several years, but a recent complaint caused the programs to be pulled from the download site.

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Rights to various forms of the codec are held by several companies they have never been released for free distribution and use by hams.

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Ambe Codec Software Download For Windows 10ДЄmbe Codec Software Download For Windows 10Д¬iting codec (coding/decoding) licensing issues, three free Windows programs for sound card-based HF digital voice were yanked from their download site for a short time recently, surprising hams who are interested in HF digital voice operation several online groups that supported the software were also closed for a short time.WinDRM, DRMDV and FDMDV, all written by Cesco Lanza, HB9TLK, used a codec that was developed for the US Department of Defense and NATO.