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Beberapa tipe format digital audio yang biasanya digunakan. Salah satunya mp3. To open these files simply install the ATRAC3 drivers. Ra – a Real Audio. Olympus has a wide range of different digital voice recorders, all of which record directly onto an internal flash drive. This allows you to record content on the go, without.
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Citing 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. Rights to various forms of the codec are held by several companies; they have never been released for free distribution and use by hams. 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. 'Lanza did a quick rewrite to use an open-source codec, and now WinDRM and FDMDV are back,' Pearce said. 'DRMDV, an intermediate program between the other two, has been abandoned. 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. WinDRM, the best sounding program, uses 2.5 kHz of spectrum. FDMDV sounds a little rougher, but uses only 1.1 kHz of spectrum. 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. The main problem with HF digital voice is that it needs fairly strong signals. FDMDV works with weaker signals than WinDRM.'
Pearce said that none of the available open-source codecs work as well as the old one: 'MELP, or Mixed Excitation Linear Prediction, was designed specifically for high-quality, lowLife Could Be a DReaM,' pages 38-40] in the April 2007 issue of QST.
07/30/2008Citing 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. Rights to various forms of the codec are held by several companies; they have never been released for free distribution and use by hams. 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. 'Lanza did a quick rewrite to use an open-source codec, and now WinDRM and FDMDV are back,' Pearce said. 'DRMDV, an intermediate program between the other two, has been abandoned. 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. WinDRM, the best sounding program, uses 2.5 kHz of spectrum. FDMDV sounds a little rougher, but uses only 1.1 kHz of spectrum. 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. The main problem with HF digital voice is that it needs fairly strong signals. FDMDV works with weaker signals than WinDRM.'
Pearce said that none of the available open-source codecs work as well as the old one: 'MELP, or Mixed Excitation Linear Prediction, was designed specifically for high-quality, lowLife Could Be a DReaM,' pages 38-40] in the April 2007 issue of QST.
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