06.533GPPANSI-C code for the GSM Enhanced Full Rate (EFR) speech codecTS

This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Special Mobile Group (SMG).

The present document provides the bit exact definition of the Enhanced Full Rate (EFR) speech traffic codec for the digital cellular telecommunications system.

An electronic attachment accompanies the present document, containing clause 5, the bit‑exact ANSI‑C code for the Enhanced Full Rate speech transcoder.

The contents of the present document is subject to continuing work within SMG and may change following formal SMG approval. Should SMG modify the contents of the present document it will be re-released with an identifying change of release date and an increase in version number as follows:

Version 8.x.y


8 indicates Release 1999 of GSM Phase 2+.

x the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc.

y the third digit is incremented when editorial only changes have been incorporated in the specification.

National transposition dates

Date of adoption of this EN:

3 November 2000

Date of latest announcement of this EN (doa):

28 February 2001

Date of latest publication of new National Standard
or endorsement of this EN (dop/e):

31 August 2001

Date of withdrawal of any conflicting National Standard (dow):

31 August 2001