Residual-excited linear prediction (RELP) is an obsolete speech coding algorithm. It was originally proposed in the 1970s[1] 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 in audio transmission.
It is still used in some text-to-speech voices, such as the diphone databases found in the Festival and Flite speech synthesizers.[2][3]
References
External links
- Taguchi, Akihiro. 2003. Residual-excited linear predictive (RELP) vocoder system with TMS320C6711 DSK and vowel characterization (Master's thesis). University of Saskatchewan. Retrieved 2024-01-15.