It is programmed in C and current source code requires floating-point arithmetic, although the algorithm itself does not require this. The source code is released under the terms of version 2.1 of the GNU Lesser General Public License (LGPL). The reference implementation is open source and is freely available in a GitHub repository. When sent packed digital bytes, it outputs PCM sampled audio. ![]() The speech codec uses 16-bit PCM sampled audio, and outputs packed digital bytes. ![]() For example, it uses half the bandwidth of Advanced Multi-Band Excitation to encode speech with similar quality. ![]() It outperforms most other low-bitrate speech codecs. The codec was developed by David Grant Rowe, with support and cooperation of other researchers (e.g., Jean-Marc Valin from Opus).
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