Residual-excited linear prediction (RELP) is an obsolete

speech coding Speech coding is an application of data compression to digital audio signals containing speech. Speech coding uses speech-specific parameter estimation using audio signal processing techniques to model the speech signal, combined with generic da ...

algorithm In mathematics and computer science, an algorithm () is a finite sequence of Rigour#Mathematics, mathematically rigorous instructions, typically used to solve a class of specific Computational problem, problems or to perform a computation. Algo ...

. It was originally proposed in the 1970s and can be seen as an ancestor of

code-excited linear prediction Code-excited linear prediction (CELP) is a linear predictive speech coding algorithm originally proposed by Manfred R. Schroeder and Bishnu S. Atal in 1985. At the time, it provided significantly better quality than existing low bit-rate algori ...

(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 A festival is an event celebrated by a community and centering on some characteristic aspect or aspects of that community and its religion or cultures. It is often marked as a local or national holiday, Melā, mela, or Muslim holidays, eid. A ...

and Flite speech synthesizers.

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. Speech codecs {{tech-stub