New Speech Related Features in GSM



This section introduces and describes the three most recent speech related features which have been, or are being, introduced into GSM; the Enhanced Full Rate Codec (EFR), Tandem Free Operation (TFO), and the Adaptive Multi-rate Codec (AMR).

Key words

GSM speech codecs 


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  1. 1.
    GSM 06.10 (ETS 300 580 2): “Digital cellular telecommunications system; Full rate speech transcoding”.Google Scholar
  2. 2.
    GSM 06.20 (ETS 300 969): “Digital cellular telecommunications system; Half rate speech; Half rate speech transcoding”.Google Scholar
  3. 3.
    GSM 06.60 (ETS 300 726): “Digital cellular telecommunications system; Enhanced Full Rate (EFR) speech transcoding”.Google Scholar
  4. 4.
    GSM 06.55 (ETR 305): “Performance Characterisation of the GSM Enhanced Full Rate (EFR) speech codec”.Google Scholar
  5. 5.
    ETSI SMG1 Committee, “Enhanced full-rate speech Study Phase Report”, 19th December 1994Google Scholar
  6. 6.
    R Steele (Ed.), “Mobile Radio Communications”, Pentech Press, 1992.Google Scholar
  7. 7.
    GSM 05.03 (ETS 300 575): “Digital cellular telecommunication system (Phase 2); Channel coding”.Google Scholar
  8. 8.
    ITU-T Recommendation P.830, “Subjective Performance Assessment of Telephone-band and Wideband Digital Codecs”.Google Scholar
  9. 9.
    GSM 02.53: “Digital cellular telecommunication system (Phase 2+); Tandem Free Operation (TFO); Service Description; Stage 1”Google Scholar
  10. 10.
    GSM 04.53: “Digital cellular telecommunication system (Phase 2+); Inband Tandem Free Operation (TFO) of Speech Codecs; Service Description; Stage 3”Google Scholar
  11. 11.
    ITU-T Recommendation G.704, “Synchronous Frame Structures used at Primary and Secondary Hierarchical Levels”.Google Scholar
  12. 12.
    GSM 08.60 (ETR 300 737): “Digital cellular telecommunications system (Phase 2+); Inband control of remote transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels”.Google Scholar
  13. 13.
    Chairman, SMG11, “Adaptive Multi-Rate (AMR) Study Phase Report”, October 1997.Google Scholar

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  1. 1.Motorola GSM Products DivisionUSA

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