Foreword

3GPP46.032Full rate speechRelease 17TSVoice Activity Detector (VAD) for full rate speech traffic channels

This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).

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_300965v080000p0.zip which accompanies the present document, contains test sequences, as described in clause A.2.

en_300965v080000p0.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 are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows:

Version x.y.z

where:

x the first digit:

1 presented to TSG for information;

2 presented to TSG for approval;

3 or greater indicates TSG approved document under change control.

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

z the third digit is incremented when editorial only changes have been incorporated in the document.

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.

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. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[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".