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Technology Stocks : Nokia (NOK)
NOK 6.910-0.9%Nov 11 3:59 PM EST
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To: slacker711 who wrote (19414)4/8/2002 5:38:21 PM
From: Eric L  Read Replies (1) of 34857
 
Slacker,

<< Has GSM instituted any new CODEC's since '98? I have no idea if AMR is the first new codec since the original GSM implementations. >>

First CODEC was full rate and half rate was introduced according to plan (around 94/95) followed quickly by EFR in maybe 1996.

EVRC is the 3rd cdma codec and the first one truly sucked.

From a voice quality point of view EFR was a big improvement. I consider it to be better than cdma with EVRC , but that is subjective, and EVRC certainly has improved voice quality..

Ironically Nokia was one of the first to use EVRC in cdma handsets I am told although I can't remember the model they originally introduced it in as they have so many "i" versions.

I've never talked to anyone in industry that would credit EVRC with giving cdmaOne close to 5x efficiency to current GSM. Closer to 3 is general rule and GSM capacity improvements over the last 4 or 5 years have been more than CODEC although I don't really know what specifically they are, but I do no that some relate to frequency hopping.

I do suppose that it is possible that by tuning a network to get maximum efficiency out of EVRC, at the possible expense of voice quality, cdmaOne might inch up towards that 5x numbers, and I'm sure that Qualcomm can simulate 5x or better in their labs, but there are labs and there are real live networks.

- Eric -
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