EFR-GSM

EFR-GSM is the most widely used codec in the world. It operates at 12.2 kbps, the basic rate for GSM phones, and is in every GSM phone. It is also the highest-quality rate in the AMR codec. Defined in the ETSI GSM 06.60 Enhanced Full Rate (EFR) speech transcoding specification, GSM-EFR has better speech quality and better robustness to network impairments in comparison to the GSM Full Rate codec (GSM-FR).

Technology

Encoded bandwidth

~ 200-3400 Hz

Standardized

ETSI 1997

Coding type

ACELP® (Algebraic Code Excited Linear Prediction)

Bit rate

12.2 kbps

Delay (ms):
Frame size
Lookahead


20
5

Quality

Toll

Complexity:
MIPS
RAM (words)


15-20
4 K

 

Applications

  • Digital telephony – Wi-Fi, VoIP, wireless (GSM, GPRS, EDGE)
  • Audio and videoconferencing
  • Media players
  • Media servers
  • Media gateways
  • Content creation tools
  • PDA/handset-hosted applications

For licensing IPR, please contact licensing@voiceage.com.

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