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3GPP Specifications -- GSM-only (Rel-4 and later) -- 46 Series
CODECs

List elaborated from: http://www.3gpp.org/ftp/Specs/html-info/46-series.htm
Last update: January 14, 2010. Each line is a link to the TS (or TR) description, which points to the "3GPP specification detail" page that gives access to MS Word versions (as zip files, possibly including associated files) as well as pdf versions.
WG3GPP Releases
 TS 46.001 sa4 4567 89 FR speech processing functions
 TS 46.002 sa4 4567 89 HR speech processing functions
 TS 46.006 sa4 4567 89 ANSI-C code for HR speech codec
 TS 46.007 sa4 4567 89 Test sequences for HR speech codec
 TS 46.008 sa4 4567 89 Performance characterization of HR speech codec
 TS 46.010 sa4 4567 89 FR speech transcoding
 TS 46.011 sa4 4567 89 Substitution and muting of lost frames for FR speech traffic channels
 TS 46.012 sa4 4567 89 Comfort noise aspects for FR speech traffic channels
 TS 46.020 sa4 4567 89 HR speech transcoding
 TS 46.021 sa4 4567 89 Substitution and muting of lost frames for HR speech traffic channels
 TS 46.022 sa4 4567 89 Comfort noise aspects for HR speech traffic channels
 TS 46.031 sa4 4567 89 DTX for FR speech traffic channels
 TS 46.032 sa4 4567 89 VAD for FR speech traffic channels
 TS 46.041 sa4 4567 89 DTX for HR speech traffic channels
 TS 46.042 sa4 4567 89 VAD for HR speech traffic channels
 TS 46.051 sa4 4567 89 EFR speech processing functions
 TS 46.053 sa4 4567 89 ANSI-C code for EFR speech codec
 TS 46.054 sa4 4567 89 Test sequences for EFR speech codec
 TR 46.055 sa4 4567 89 Performance characterisation of EFR speech codec
 TS 46.060 sa4 4567 89 EFR speech transcoding
 TS 46.061 sa4 4567 89 Substitution and muting of lost frames for EFR speech traffic channels
 TS 46.062 sa4 4567 89 Comfort noise aspects for EFR speech traffic channels
 TR 46.076 sa4 4567 89 AMR speech codec - Study phase report
 TS 46.081 sa4 4567 89 DTX for EFR speech traffic channels
 TS 46.082 sa4 4567 89 VAD for EFR speech traffic channels
 TR 46.085 sa4 4567 89 Subjective tests on interoperability of HR/FR/EFR speech codecs
GSM TS 46.001 sa4
Full rate speech - Processing functions
The present document is an introduction to the 06 series of the GSM technical specifications dealing with the Full rate speech processing functions in the GSM system. A general overview of the speech processing parts is given with reference to the technical specifications where each part is specified in detail.
-  V4.0  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Paolino Usai
GSM antecedent(s): TS 06.01
GSM TS 46.002 sa4
Half rate speech - Half rate speech processing functions
The present document is an introduction to TS 06.20, TS 06.21, TS 06.22, TS 06.41 and TS 06.42 TSs dealing with the speech processing functions in the half rate channel of the GSM system. A general overview of the speech processing functions is given, with reference to the TSs where each function is specified in detail.
-  V4.0  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Steve Aftelak
GSM antecedent(s): TS 06.02
GSM TS 46.006 sa4
Half rate speech - ANSI-C code for GSM half-rate speech codec
The present document contains an electronic copy of the ANSI C code for the GSM half rate codec. The ANSI C code is necessary for a bit exact implementation of the half rate speech transcoder (TS 06.20), Voice Activity Detector (TS 06.42), comfort noise (TS 06.22), Discontinuous Transmission (TS 06.41) and example solutions for substituting and muting of lost frames (TS 06.21).
-  V4.0  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Steve Aftelak
GSM antecedent(s): TS 06.06
GSM TS 46.007 sa4
Half rate speech - Test sequences for the GSM half rate speech codec
The present document specifies the digital test sequences for the GSM half rate speech codec. These sequences test for a bit exact implementation of the half rate speech transcoder (TS 06.20), Voice Activity Detector (TS 06.42), comfort noise (TS 06.22) and the discontinuous transmission (TS 06.41).
-  V4.0  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Steve Aftelak
GSM antecedent(s): TS 06.07
GSM TS 46.008 sa4
Half rate speech - Performance Characterization of the GSM Half Rate speech codec
The present document gives background information on the performance of the GSM half rate speech codec. Experimental results from the characterization and verification tests carried out during the selection process by the Traffic CHannel Half rate Speech (TCH-HS) expert group are reported to give a more detailed picture of the behaviour of the GSM half rate speech codec under different conditions of operation.
-  V4.0  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Paolino Usai
GSM antecedent(s): TR 06.08
GSM TS 46.010 sa4
Full rate speech - Transcoding
The transcoding procedure specified in the present document is applicable for the full rate Traffic Channel (TCH) in the digital cellular telecommunications system. The use of this transcoding scheme for other applications has not been considered.

In TS 06.01, a reference configuration for the speech transmission chain of the digital cellular telecommunications system is shown. According to this reference configuration, the speech encoder takes its input as a 13 bit uniform PCM signal either from the audio part of the mobile station or on the network side, from the PSTN via an 8 bit/A or u-law (PCS 1900) to 13 bit uniform PCM conversion. The encoded speech at the output of the speech encoder is delivered to a channel encoder unit which is specified in TS 05.03. In the receive direction, the inverse operations take place.

The present document describes the detailed mapping between input blocks of 160 speech samples in 13 bit uniform PCM format to encoded blocks of 260 bits and from encoded blocks of 260 bits to output blocks of 160 reconstructed speech samples. The sampling rate is 8000 sample/s leading to an average bit rate for the encoded bit stream of 13 kbit/s. The coding scheme is the so called Regular Pulse Excitation Long Term prediction Linear Predictive Coder, here after referred to as RPE LTP.

The present document also specifies the conversion between A and u-law (PCS 1900) PCM and 13 bit uniform PCM. Performance requirements for the audio input and output parts are included only to the extent that they affect the transcoder performance. The present document also describes the codec down to the bit level, thus enabling the verification of compliance to the present document to a high degree of confidence by use of a set of digital test sequences.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Karl Hellwig
GSM antecedent(s): TS 06.10
GSM TS 46.011 sa4
Full rate speech - Substitution and muting of lost frames for full rate speech channels
The present document defines a frame substitution and muting procedure which shall be used by the RX DTX handler when one or more lost speech or SID frames are received from the radio subsystem.

The requirements of the present document are mandatory for implementation in all GSM Base Station Systems (BSS) and Mobile Stations (MS).
-  V4.0  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: William Navarro
GSM antecedent(s): TS 06.11
GSM TS 46.012 sa4
Full rate speech - Comfort noise aspect for full rate speech traffic channels
The present document gives the detailed requirements for the correct operation of the background acoustic noise evaluation, noise parameter encoding/decoding and comfort noise generation in GSM Mobile Stations (MS)s and Base Station Systems (BSS)s during Discontinuous Transmission (DTX) on full rate speech traffic channels.

The requirements described in the present document are mandatory for implementation in all GSM MSs. The receiver requirements are mandatory for implementation in all GSM BSSs, the transmitter requirements only for those where downlink DTX will be used.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: William Navarro
GSM antecedent(s): TS 06.12
GSM TS 46.020 sa4
Half rate speech - Half rate speech transcoding
The present document specifies the speech codec to be used for the GSM half rate channel. It also specifies the test methods to be used to verify that the codec implementation complies with the present document.

The requirements are mandatory for the codec to be used either in GSM Mobile Stations (MS)s or Base Station Systems (BSS)s that utilize the half rate GSM speech traffic channel.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Steve Aftelak
GSM antecedent(s): TS 06.20
GSM TS 46.021 sa4
Half rate speech - Substitution and muting of lost frames for half rate speech traffic channels
The present document defines a frame substitution and muting procedure which shall be used by the Receive (RX) Discontinuous Transmission (DTX) handler when one or more lost or unreliable speech or SIlence Descriptor (SID) frames are received from the Radio Sub System (RSS).

The requirements of the present document are mandatory for implementation in all GSM Base Station Systems (BSS)s and Mobile Stations (MS)s capable of supporting the half rate speech traffic channel.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Steve Aftelak
GSM antecedent(s): TS 06.21
GSM TS 46.022 sa4
Half rate speech - Comfort noise aspects for the half rate speech traffic channels
The present document gives the detailed requirements for the correct operation of the background acoustic noise evaluation, noise parameter encoding/decoding and comfort noise generation in GSM Mobile Stations (MS)s and Base Station Systems (BSS)s during Discontinuous Transmission (DTX) on half rate speech traffic channels.

The requirements described in the present document are mandatory for implementation in all GSM MSs capable of supporting the half rate speech traffic channel.

The receiver requirements are mandatory for implementation in all GSM BSSs capable of supporting the half rate speech traffic channel, the transmitter requirements are only for those where downlink DTX will be used.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Steve Aftelak
GSM antecedent(s): TS 06.22
GSM TS 46.031 sa4
Full rate speech - Discontinuous Transmission (DTX) for full rate speech traffic channels
The present document gives a description of the general baseband operation of full rate speech traffic channels in the transmitter and in the receiver of GSM Mobile Stations (MS)s and Base Station Systems (BSS)s during Discontinuous Transmission (DTX).

For clarity, the description is structured according the block diagrams in figures 1 and 4. Except in the case described next, this structure of distributing the various functions between system entities is not mandatory for implementation, as long as the operation on the air interface and on the speech decoder output remains the same.

In the case of BSSs where the speech transcoder is located remotely in the Base Station Controller (BSC), the implementation of the interfaces between the DTX Handlers and the Radio Subsystem (RSS) as described in the present document together with all their flags is mandatory, being a part of the A bis interface as described in TS 08.60. In this case the various flags also serve to avoid additional delays.

The DTX functions described in the present document are mandatory for implementation in all GSM MSs. The receiver requirements are mandatory for implementation in all GSM BSSs, the transmitter requirements only for those where downlink DTX will be used.

DTX shall be in operation in GSM MSs if commanded so by the network, see TS 04.08.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Paolino Usai
GSM antecedent(s): TS 06.31
GSM TS 46.032 sa4
Full rate speech - Voice Activity Detector (VAD) for full rate speech traffic channels
The present document specifies the Voice Activity Detector (VAD) to be used in the Discontinuous Transmission (DTX) as described in TS 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.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Paul Barrett
GSM antecedent(s): TS 06.32
GSM TS 46.041 sa4
Half rate speech - Discontinuous Transmission (DTX) for half rate speech traffic channels
The present document gives a description of the general baseband operation of half rate speech traffic channels in the transmitter and in the receiver of GSM Mobile Stations (MS)s and Base Station Systems (BSS)s during Discontinuous Transmission (DTX).

For clarity, the description is structured according to the block diagrams in figures 1 and 4. Except in the case described below, this structure of distributing the various functions between system entities is not mandatory for implementation, as long as the operation on the air interface and on the speech decoder output remains the same.

In the case of BSSs where the speech transcoder is located remotely in the Base Station Controller (BSC), the implementation of the interfaces between the DTX Handlers and the Radio Sub System (RSS) as described in the present document together with all their flags is mandatory, being a part of the A-bis interface as described in TS 08.61.

The DTX functions described in the present document are mandatory for implementation in all GSM MSs. The receiver requirements are mandatory for implementation in all GSM BSSs, the transmitter requirements only for those where downlink DTX will be used.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Paolino Usai
GSM antecedent(s): TS 06.41
GSM TS 46.042 sa4
Half rate speech - Voice Activity Detector (VAD) for half rate speech traffic channels
The present document specifies the Voice Activity Detector (VAD) to be used in the Discontinuous Transmission (DTX) as described in TS 06.41. It also specifies the test methods to be used to verify that a VAD implementation complies with the present document.

The requirements are mandatory on any VAD to be used either in GSM Mobile Stations (MS)s or Base Station Systems (BSS)s that utilize the half rate GSM speech traffic channel.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Paul Barrett
GSM antecedent(s): TS 06.42
GSM TS 46.051 sa4
Enhanced Full Rate (EFR) speech processing functions - General description
The present document is an introduction to TS 06.60, TS 06.61, TS 06.62, TS 06.81 and TS 06.82 ENs dealing with the speech processing functions in the Enhanced Full Rate channel of the GSM system. A general overview of the speech processing functions is given, with reference to the ENs where each function is specified in detail.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Kari Jarvinen
GSM antecedent(s): TS 06.51
GSM TS 46.053 sa4
ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec
The present document contains an electronic copy of the ANSI C code for the GSM Enhanced Full Rate codec. The ANSI C code is necessary for a bit exact implementation of the Enhanced Full Rate speech transcoder (TS 06.60), Voice Activity Detection (TS 06.82), comfort noise (TS 06.62), Discontinuous Transmission (TS 06.81) and example solutions for substituting and muting of lost frames (TS 06.61).
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Kari Jarvinen
GSM antecedent(s): TS 06.53
GSM TS 46.054 sa4
Test sequences for the GSM Enhanced Full Rate (EFR) speech codec
The present document specifies the digital test sequences for the GSM enhanced full rate speech codec. These sequences test for a bit exact implementation of the enhanced full rate speech transcoder (TS 06.60), Voice Activity Detection (TS 06.82), comfort noise (TS 06.62) and the discontinuous transmission (TS 06.81).
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Kari Jarvinen
GSM antecedent(s): TS 06.54
GSM TS 46.055 sa4
Performance characterization of the GSM Enhanced Full Rate (EFR) speech codec
The present document gives background information on the performance of the GSM enhanced full rate speech codec. Experimental results from the Pre-selection and Verification tests carried out during the standardization process by the SEG (Speech Expert Group) are reported to give a more detailed picture of the behaviour of the GSM enhanced full rate speech codec under different conditions of operation.
-  V4.0  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Paolino Usai
GSM antecedent(s): TR 06.55
GSM TS 46.060 sa4
Enhanced Full Rate (EFR) speech transcoding
The present document describes the detailed mapping between input blocks of 160 speech samples in 13 bit uniform PCM format to encoded blocks of 244 bits and from encoded blocks of 244 bits to output blocks of 160 reconstructed speech samples. The sampling rate is 8 000 sample/s leading to a bit rate for the encoded bit stream of 12,2 kbit/s. The coding scheme is the so called Algebraic Code Excited Linear Prediction Coder, hereafter referred to as ACELP.

The present document also specifies the conversion between A law or u-law (PCS 1900) PCM and 13 bit uniform PCM. Performance requirements for the audio input and output parts are included only to the extent that they affect the transcoder performance. This part also describes the codec down to the bit level, thus enabling the verification of compliance to the part to a high degree of confidence by use of a set of digital test sequences. These test sequences are described in TS 06.54 and are available on disks.

In case of discrepancy between the requirements described in the present document and the fixed point computational description (ANSI C code) of these requirements contained in TS 06.53, the description in TS 06.53 will prevail.

The transcoding procedure specified in the present document is applicable for the enhanced full rate speech traffic channel (TCH) in the GSM system.

In TS 06.51, a reference configuration for the speech transmission chain of the GSM enhanced full rate (EFR) system is shown. According to this reference configuration, the speech encoder takes its input as a 13 bit uniform PCM signal either from the audio part of the Mobile Station or on the network side, from the PSTN via an 8 bit/A law or u-law (PCS 1900) to 13 bit uniform PCM conversion. The encoded speech at the output of the speech encoder is delivered to a channel encoder unit which is specified in TS 05.03. In the receive direction, the inverse operations take place.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Kari Jarvinen
GSM antecedent(s): TS 06.60
GSM TS 46.061 sa4
Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech traffic channels
The present document defines a frame substitution and muting procedure which shall be used by the Receive (RX) Discontinuous Transmission (DTX) handler when one or more lost speech or Silence Descriptor (SID) frames are received from the Radio Sub System (RSS).

The requirements of the present document are mandatory for implementation in all GSM Base Station Systems (BSS)s and Mobile Stations (MS)s capable of supporting the enhanced Full Rate speech traffic channel. It is not mandatory to follow the bit exact implementation outlined in the present document and the corresponding C source code.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Kari Jarvinen
GSM antecedent(s): TS 06.61
GSM TS 46.062 sa4
Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels
The present document gives the detailed requirements for the correct operation of the background acoustic noise evaluation, noise parameter encoding/decoding and comfort noise generation in Mobile Stations (MSs) and Base Station Systems (BSSs) during Discontinuous Transmission (DTX) on Enhanced Full Rate speech traffic channels.

The requirements described in the present document are mandatory for implementation in all GSM MSs capable of supporting the Enhanced Full Rate speech traffic channel.

The receiver requirements are mandatory for implementation in all GSM BSSs capable of supporting the Enhanced Full Rate speech traffic channel, the transmitter requirements only for those where downlink DTX will be used.

In case of discrepancy between the requirements described in the present document and the fixed point computational description of these requirements contained in TS 06.53, the description in TS 06.53 will prevail.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Kari Jarvinen
GSM antecedent(s): TS 06.62
GSM TS 46.076 sa4
Adaptive Multi-Rate (AMR) speech codec - Study phase report
The present document presents the outcome of the Study Phase initiated at SMG#20 on the concept of the Adaptive Multi-Rate (AMR) codec. The AMR concept represents a new approach to achieving consistent high quality speech combined with efficient spectrum usage. It was recognized at SMG#20 that this would require novel techniques whose feasibility should first be assessed before proceeding with a full development of the AMR system and its control.

Clauses 1 to 4 provide an overview and background to the AMR concept. Clause 5 provides a basic description of the AMR system functionality including working assumptions that have been agreed during the Study Phase. Feasibility aspects are considered in clause 6. The requirement specification, which will form the basis for the development phase, is contained in clause 7. Clause 8 gives an indication of the MS and network upgrades needed to support AMR. Clause 9 outlines how the AMR codec will be developed, tested and selected including the proposed time-plan. Clauses 10 and 11 conclude with a summary of the risks and recommendations.
-  V4.0  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Paolino Usai
GSM antecedent(s): TR 06.76
GSM TS 46.081 sa4
Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels
The present document gives a description of the general baseband operation of Enhanced Full Rate speech traffic channels in the transmitter and in the receiver of GSM Mobile Stations (MS)s and Base Station Systems (BSS)s during Discontinuous Transmission (DTX).

For clarity, the description is structured according to the block diagrams in figures 1 and 4. Except in the case described next, this structure of distributing the various functions between system entities is not mandatory for implementation, as long as the operation on the air interface and on the speech decoder output remains the same.

In the case of BSSs where the speech transcoder is located remotely in the Base Station Controller (BSC), the implementation of the interfaces between the DTX handlers and the Radio Sub System (RSS) as described in the present document together with all their flags is mandatory, being part of the A bis interface as described in TS 08.60.

The DTX functions described in the present document are mandatory for implementation in the GSM MSs. The receiver requirements are mandatory for implementation in all GSM BSSs, the transmitter requirements only for those where downlink DTX will be used.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Kari Jarvinen
GSM antecedent(s): TS 06.81
GSM TS 46.082 sa4
Voice Activity Detector (VAD) for Enhanced Full Rate (EFR) speech traffic channels
The present document specifies the Voice Activity Detector (VAD) to be used in the Discontinuous Transmission (DTX) as described in TS 06.81 Discontinuous transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels.

The requirements are mandatory on any VAD to be used either in GSM Mobile Stations (MS)s or Base Station Systems (BSS)s that utilize the enhanced full-rate speech traffic channel.
-  V4.1  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Kari Jarvinen
GSM antecedent(s): TS 06.82
GSM TS 46.085 sa4
Subjective tests on the interoperability of the Half Rate / Full Rate / Enhanced Full Rate (HR/FR/EFR) speech codecs, single, tandem and tandem free operation
The present document contains the results obtained from an internationally co-ordinated subjective evaluation conducted by four laboratories to estimate the performance in mobile-to-mobile connections of the GSM half, full, and enhanced full rate speech codecs (including the expected advantages of the Tandem Free Operation), in case of interoperability in the digital cellular telecommunications system. These (listening-only) tests did not include the effects of Voice Activity Detector, Comfort Noise Insertion and the Discontinuous Transmission.
-  V4.0  V5.0  V6.0  V7.0  V8.0  V9.0  -  -  -
List  Index Rapporteur: Paolino Usai
GSM antecedent(s): TR 06.85
  
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