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

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(P) V14.1.0    2017/06    86 p.
(P) V13.2.0    2017/06    86 p.
(P) V12.7.0    2017/06    86 p.

Rapporteur:  Mr. Miao, Lei
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.


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

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