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Content for  TS 26.101  Word version:  17.0.0

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1  Scopep. 5

The present document describes a generic frame format for the Adaptive Multi-Rate (AMR) speech codec and the Enhanced Full Rate (GSM-EFR) speech codec. This format shall be used as a common reference point when interfacing speech frames between different elements of the 3G system and between different systems. Appropriate mappings to and from this generic frame format will be used within and between each system element.
Annex A describes a second frame format which shall be used when octet alignment of AMR frames is required.

2  Referencesp. 5

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]  TS 26.090: "AMR Speech Codec; Speech Transcoding Functions".
[2]  TS 26.093: "AMR Speech Codec; Source Controlled Rate Operation".
[3]  TS 26.092: "AMR Speech Codec; Comfort Noise Aspects".
[4]  TS 46.060: "EFR Speech Codec; Speech Transcoding Functions".
[5]  TS 46.062: "EFR Speech Codec; Comfort Noise Aspects".

3  Definitions and Abbreviationsp. 5

3.1  Definitionsp. 5

For the purposes of the present document, the following terms and definitions apply:
AMR mode:
one of the eight AMR codec bit-rates denoted also with indices 0 to 7 where 0 maps to the 4.75 kbis/s mode and 7 maps to the 12.2 kbit/s mode.
AMR codec mode:
same as AMR mode.
classification of the received frame as defined in [2].
classification of the transmitted frame as defined in [2].

3.2  Abbreviationsp. 5

For the purposes of the present document, the following abbreviations apply:
Cyclic Redundancy Check
Frame Quality Indicator
Global System for Mobile communication
Least Significant Bit
Most Significant Bit
Personal Digital Communication (ARIB standard)
Source Controlled Rate operation
Silence Descriptor (Comfort Noise Frame)
Time Division Multiple Access (IS-641)

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