IS-641

TIA/EIA standard IS-641 is a speech coding standard released in 1996[1] and used in some computer and telecommunications networks in the United States.

IS-641

TIA/EIA standard IS-641 is a speech coding standard released in 1996[1] and used in some computer and telecommunications networks in the United States. The main usage was in the U.S. TDMA networks defined by IS-136.[2][3] The bit rate of the speech codec is 7.4 kbit/s.[1] This codec is the same as the 7.4 kbit/s mode in the AMR speech codec.[citation needed] The standard was superseded[citation needed] by TIA/EIA-136-410's release in 1999.[4]

References

  1. ^ a b "TIA TIA/EIA/IS-641-A TDMA Cellular/PCS - Radio Interface Enhanced Full-Rate Voice Codec". Accuris Tech. Retrieved 3 July 2025. This document gives a description of the Nokia/JSH speech and channel codec for the TIA IS-641 Enhanced Full Rate Codec. The codec consists of a 7.4 kbit/s ACELP speech codec and a 5.6 kbit/s channel codec (Forward Error Correction).
  2. ^ ITU-T Recommendation G.108: Application of the E-model: A planning guide (Technical report). September 1999. p. 4. Archived (PDF) from the original on 30 April 2024.
  3. ^ Garg, Vijay K. (2001). "Evolution of TDMA-Based 2G Systems to 3G Systems" (PDF). Wireless Network Evolution: 2G to 3G (1st ed.). Prentice Hall. p. 343. ISBN 9780130280770. Archived (PDF) from the original on 30 April 2024.
  4. ^ "TIA ANSI/TIA/EIA-136-410 TDMA Celular/PCS Radio Interface Enhanced Full-Rate Voice Codec". Accuris Tech. Retrieved 3 July 2025.


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