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TS 26.091
Mandatory Speech Codec Speech Processing Functions –
Adaptive Multi-Rate (AMR) Speech Codec –
Error Concealment of Lost Frames

3GPP‑Page   ETSI‑search   fToC↓   Partial Content →
V19.0.0 (PDF)  2025/09  15 p.
V18.0.0  2024/03  15 p.
V17.0.0  2022/03  15 p.
V16.0.0  2020/06  15 p.
V15.0.0  2018/06  15 p.
V14.0.0  2017/03  15 p.
V13.0.0  2015/12  15 p.
V12.0.0  2014/09  15 p.
V11.0.0  2012/09  15 p.
V10.0.0  2011/04  15 p.
V9.0.0  2009/12  15 p.
V8.0.0  2008/12  15 p.
V7.0.0  2007/06  15 p.
V6.0.0  2005/01  15 p.
V5.0.0  2002/06  15 p.
V4.0.0  2001/04  15 p.
V3.1.0  1999/12  15 p.
GSM Rel-98 v7.1.1  2000/05  14 p.
Rapporteur:
Dr. Bruhn, Stefan
Ericsson LM

full Table of Contents for  TS 26.091  Word version:  19.0.0

each clause number in 'red' refers to the equivalent title in the Partial Content
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1Scope  p. 5
2References  p. 5
3Definitions and abbreviations  p. 5
3.1Definitions  p. 5
3.2Abbreviations  p. 5
4General  p. 6
5Requirements  p. 6
5.1Error detection  p. 6
5.2Lost speech frames  p. 6
5.3First lost SID frame  p. 6
5.4Subsequent lost SID frames  p. 6
6Example ECU/BFH Solution 1  p. 6
6.1State Machine  p. 7
6.2Assumed Active Speech Frame Error Concealment Unit Actions  p. 8
6.2.1BFI = 0, prevBFI = 0, State = 0  p. 8
6.2.2BFI = 0, prevBFI = 1, State = 0 or 5  p. 8
6.2.3BFI = 1, prevBFI = 0 or 1, State = 1...6  p. 9
6.2.3.1LTP-lag update  p. 9
6.2.3.2Innovation sequence  p. 9
6.3Assumed Non-Active Speech Signal Error Concealment Unit Actions  p. 10
6.3.1General  p. 10
6.3.2Detectors  p. 10
6.3.2.1Background detector  p. 10
6.3.2.2Voicing detector  p. 10
6.3.3Background ECU Actions  p. 10
6.4Substitution and muting of lost SID frames  p. 10
7Example ECU/BFH Solution 2  p. 11
7.1State Machine  p. 11
7.2Substitution and muting of lost speech frames  p. 11
7.2.1BFI = 0, prevBFI = 0, State = 0  p. 11
7.2.2BFI = 0, prevBFI = 1, State = 0 or 5  p. 11
7.2.3BFI = 1, prevBFI = 0 or 1, State = 1...6  p. 12
7.2.3.1LTP-lag update  p. 12
7.2.4Innovation sequence  p. 12
7.3Substitution and muting of lost SID frames  p. 12
$Change history  p. 13

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