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Residual Excited Linear Prediction (RELP)
Residual Excited Linear Prediction (RELP) is an obsolete speech coding algorithm. It was originally proposed in the 1970s and can be seen as an ancestor of Code Excited Linear Prediction (CELP). Unlike CELP however, RELP directly transmits the residual signal. To achieve lower rates, that residual signal is usually down-sampled (e.g. to 1-2 kHz). The algorithm is hardly used anymore.