September 22-25, 1997
This paper describes an improved RP-VSELP (IRP-VSELP) speech coding. The RP-VSELP is classifed as a fast VSELP since it produces a comparable speech quality to the VSELP with much simplified system complexity. The new RP-VSELP coder proposed in this paper has additional new features, such as a fast codebook search obtained by employing backward filtering and pitch-adaptive regular pulse excitation. Due to new features added to the original RP-VSELP, the proposed method not only reduces the complexity of the original RP- VSELP but also provides an improved speech quality. Throughout objective and subjective tests, IRP-VSELP outperformed RP-VSELP as the ref erence coder. Simulation results are presented to verify the performance of the proposed method.
Bibliographic reference. Choi, Yong-Soo / Kang, Hong-Goo / Park, Sang-Wook / Yoo, Jae-Ha / Youn, Dae-Hee (1997): "Improved regular pulse VSELP coding of speech at low bit-rates", In EUROSPEECH-1997, 1267-1270.