Foreword

06.323GPPTSVoice Activity Detection (VAD)

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

The present document specifies the Voice Activity Detector (VAD) to be used in the Discontinuous Transmission (DTX) for the digital cellular telecommunications system.

Archive en_300965v080001p0.zip which accompanies the present document, contains test sequences, as described in clause A.2.

en_300965v080001p0.zip Annex B: Test sequences for the GSM Full Rate speech codec; Test sequences files *.inp, *.cod, *.vad.

The specification from which the present document has been derived was originally based on CEPT documentation, hence the presentation of the present document may not be entirely in accordance with the ETSI/PNE Rules.

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

where:

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

0.1 Scope

The present document specifies the Voice Activity Detector (VAD) to be used in the Discontinuous Transmission (DTX) as described in GSM 06.31. It also specifies the test methods to be used to verify that a VAD complies with the technical specification.

The requirements are mandatory on any VAD to be used either in the GSM Mobile Stations (MS)s or Base Station Systems (BSS)s.

0.2 References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

  • References are either specific (identified by date of publication, edition number, version number, etc.) or non‑specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies.
  • A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number.
  • For this Release 1999 document, references to GSM documents are for Release 1999 versions (version 8.x.y).

[1] GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms".

[2] GSM 06.10: "Digital cellular telecommunications system(Phase 2+); Full rate speech; Transcoding".

[3] GSM 06.12: "Digital cellular telecommunications system(Phase 2+); Full rate speech; Comfort noise aspect for full rate speech traffic channels".

[4] GSM 06.31: "Digital cellular telecommunications system(Phase 2+); Full rate speech; Discontinuous Transmission (DTX) for full rate speech traffic channels".

0.3 Abbreviations

Abbreviations used in the present document are listed in GSM 01.04 [1].