Tech-invite3GPPspecsGlossariesIETFRFCsGroupsSIPABNFsWorld Map
Top   in Index   Prev   Next

TS 26.447 (SA4)
Codec for Enhanced Voice Services (EVS) –
Error Concealment of Lost Packets

ToC   3GPP‑Page   ETSI‑search   Help    
V15.0.0 (PDF)2018/06  84 p.
V14.1.0  2017/06  86 p.
V13.2.0  2017/06  86 p.
V12.7.0  2017/06  86 p.

Rapporteur:  Dr. Bruhn, Stefan
See also:  EVS-related TS/TR

The present document defines a frame loss concealment procedure, also termed frame substitution and muting procedure, which is executed by the Enhanced Voice Services (EVS) decoder when one or more frames (speech or audio or SID frames) are unavailable for decoding due to e.g. packet loss, corruption of a packet or late arrival of a packet.


Here   Top



1  ScopePDF-p. 7
2  References
3  Definitions, symbols and abbreviations
4  General
5  Detailed descriptionPDF-p. 9
5.1  Concealment operation related to signal classification
5.2  Concealment operation related to spectral envelope (LPC) representationPDF-p. 12
5.3  Concealment operation related to ACELP modesPDF-p. 16
5.3.1  General
5.3.2  Concealment for bandwidth extension for ACELP modes
5.3.3  Guided concealment and recoveryPDF-p. 29
5.3.4  Handling of multiple frame losses and mutingPDF-p. 35
5.4  Concealment operation related to MDCT modesPDF-p. 38
5.4.1  PLC method selection
5.4.2  TCX MDCT
5.4.3  HQ MDCTUp
5.4.5  Guided concealment and recoveryPDF-p. 78
5.4.6  Handling of multiple frame losses and muting
5.5  SID frame concealment operationPDF-p. 83
A  Change historyPDF-p. 84

Up   Top