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Isn't it used again for mobile phones communications? --Čikić Dragan (talk) 21:03, 19 January 2008 (UTC)
CELP (and variants such as ACELP and RCELP) is, but RELP is dead. —Preceding unsigned comment added by Jmvalin (talk • contribs) 23:31, 21 January 2008 (UTC)
What about this?
"... Many variations of this class of adaptive predictive coders exists. The ETSI-GSM Full Rate codec (GSM 06.10) which is implemented in most of the GSM digital cellular networks is an example of the family of RELP (Residual Excited Linear Prediction) coders." [1] --Čikić Dragan (talk) 12:48, 6 February 2008 (UTC)
GSM-FR is a multi-pulse codec. As far as I'm concerned, it's about as close as RELP as it is to CELP (actually, I would have said closer to CELP). It's definitely unlike RELP in that typically RELP codecs would only encode the residual in a small band (e.g. <1 kHz) and then extent it to fill the full 4 kHz bandwidth. GSM-FR on the other hand codes the entire band with a few pulses. But it's still really ancient/crappy anyway. Jmvalin (talk) 23:13, 6 February 2008 (UTC)
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