Notes: Thank you very much Armin for providing the MELPe samples. Here is Codec 2 operating at 2400 bit/s compared to some other low bit rate codecs: Codec Companies can support Codec 2 by paid contract development.
Individuals can support Codec2 development by helping out with coding, testing, and documentation, buying a SM1000, or donating via PayPal or Patreon. The motivations behind the Codec 2 project are summarised in this blog post. FreeDV is available as a GUI application, an open source library (FreeDV API), and in hardware ( the SM1000 FreeDV adaptor).
#Ambe codec introduction code
The Codec 2 project also contains several modems (OFDM, FDMDV, COHPSK and mFSK) carefully designed for digital voice over HF radio GNU Octave simulation code to support the codec and modem development and FreeDV – an open source digital voice protocol that integrates the modems, codecs, and FEC. Informal listening tests indicate that Codec 2 at 700 bits/s has better speech quality than MELP and is comparable to TWELP at 600 bit/s. It fills a gap in open source voice codecs beneath 5000 bit/s and is released under the GNU Lesser General Public License (LGPL). The main application is low bandwidth HF/VHF digital radio.
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