Enhanced Full Rate or EFR or GSM-EFR or GSM 06.60 is a speech coding standard that was developed in order to improve the quite poor quality of GSM-Full Rate (FR) codec. Working at 12.2 kbit/s the EFR provides wirelike quality in any noise free and background noise conditions. The EFR 12.2 kbit/s speech coding standard is compatible with the highest AMR mode (both are ACELP). Although the Enhanced Full Rate helps to improve call quality, this codec have higher computational complexity, which in a mobile device can potentially result in increase of energy consumption as high as 5% compared to 'old' FR codec.
Enhanced Full Rate was developed by Nokia and the University of Sherbrooke (Canada). In 1995, ETSI has selected the Enhanced Full Rate voice codec as the industry standard codec for GSM/DCS.
Read more about Enhanced Full Rate: Technology, Licensing and Patent Issues, To Enable and Disable (Nokia 3310)
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