TETRA Speech Codec

The TETRA speech codec is part of the family of ACELP codecs.

For more information, please check out the following specifications:
  • ETSI EN 300 395-1 (General description of speech functions)
  • ETSI EN 300 395-2 (TETRA Codec)
  • ETSI EN 300 395-3 (Specific operating features)
  • ETSI EN 300 395-4 (Codec conformance testing)


ETSI has published a reference implementation of the codec implemented in C.

It is freely available together with ETSI EN 300 395-2.

In order to obtain it, follow the following procedure:
  • go to
  • enter "en 300 395-2" as search term
  • execute the search, there should only be one result in the list
  • click on the 'Download' link (top right part of the result table)
  • enter your e-mail address in the 'users without an ETSI account' field
  • click submit
  • click on the folder-like symbol on the bottom left side of the result table (see below)
  • you should now have a file called

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etsi_codec_download.png View etsi_codec_download.png 22 KB laforge, 06/23/2011 10:17 AM

Updated by laforge about 8 years ago · 4 revisions

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