It is however possible to develop a open source, free-as-in-speech codec with similar performance at similar bit rates. What's the issue with AMBE? Codec2 developer David Rowe, VK5DGR talks about this on his blog: - 'Due to patents and the amount of confidential information surrounding these codecs (AMBE) I don’t think it is possible to make an open codec compatible with these closed codecs. It's advocates include Bruce Perens, K6BP, () who is well known in open source software circles, and is a huge Free Software advocate. This open voice codec is called Codec2, and is in a highly experimental stage at this current point. An AMBE open source compatible codec? If radio manufactures stop using the AMBE chip and start using a software solution that doesn't return the royalties to. For the price of one AMBE/MELP license a lot of Codec 2. Development on an open source, freely available alternative to AMBE has been spearheaded by Australian amateur David Rowe, VK5DGR.Ĭodec 2 is an open source speech codec designed for. However, the AMBE voice encoding scheme currently used by the DSTAR protocol is not open, rather it is patented by DVSI, Inc.

Open Source DSTAR Voice - Codec2: from KE7HQY on JThe DSTAR protocol is open and freely available, developed by the Japanese Amateur Radio League (JARL).

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