Relaxed code-excited linear prediction (RCELP) is a method used in some advanced speech codecs. The RCELP algorithm does not attempt to match the original signal exactly. Instead, it matches a time-warped version of this original signal that conforms to a simplified pitch contour.[1]

References

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  1. ^ Bäckström, Tom; Fuchs, Guillaume (2017-01-01). Speech Coding. Signals and Communication Technology. Springer International Publishing. pp. 205–215. doi:10.1007/978-3-319-50204-5_14. ISBN 9783319502021.

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Enhanced Variable Rate Codec B

applications. In addition to the Relaxed Code Excitation Linear Prediction (RCELP) used by EVRC, EVRC-B uses Prototype Pitch Period (PPP) approach for coding

Enhanced Variable Rate Codec

increasing the amount of bandwidth or wireless spectrum needed. EVRC uses RCELP technology. EVRC compresses each 20 milliseconds of 8000 Hz, 16-bit sampled

Audio coding format

code-excited linear prediction (ACELP) Relaxed code-excited linear prediction (RCELP) Low-delay CELP (LD-CELP) Adaptive Multi-Rate (used in GSM and 3GPP) Codec

Lossy compression

code-excited linear prediction (ACELP) Relaxed code-excited linear prediction (RCELP) Low-delay CELP (LD-CELP) Adaptive Multi-Rate (used in GSM and 3GPP) Codec2

List of codecs

2 (3GPP2) Enhanced Variable Rate Codec (EVRC, a.k.a. IS-127) – based on RCELP FFmpeg (decoder only) Enhanced Variable Rate Codec B (EVRC-B) QCELP (Qualcomm