Title :
An improved mixed excitation linear prediction (MELP) coder
Author :
Unno, Takahiro ; Barnwell, Thomas P., III ; Truong, Kwan
Author_Institution :
Center for Signal & Image Process., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
This paper presents an improved mixed excitation linear prediction (MELP) coder. The MELP is the linear-prediction-based speech coder that was chosen as the new 2400 bps US Federal Standard. Even though the MELP is quite good, there are still some perceivable distortions, particularly around non-stationary speech segments and for some low-pitch male speakers. The key features of our new coder include a robust pitch detection algorithm, a new plosive analysis/synthesis method, and a post processor for the Fourier magnitude model. Formal quality tests are used to show that the new MELP improves the quality of the US Federal Standard MELP coder while requiring only a small increase in algorithmic delay and while also retaining compatibility with the Federal Standard MELP bit-stream specification
Keywords :
code standards; linear predictive coding; signal detection; speech coding; speech synthesis; telecommunication standards; vocoders; 2400 bit/s; Fourier magnitude model; MELP bit-stream specification; MELP coder; US Federal Standard; algorithmic delay; compatibility; distortions; formal quality tests; low-pitch male speakers; mixed excitation linear prediction coder; nonstationary speech segments; plosive analysis/synthesis method; post processor; robust pitch detection algorithm; Acoustic noise; Algorithm design and analysis; Code standards; Detection algorithms; Signal processing; Speech analysis; Speech enhancement; Speech processing; Speech synthesis; Testing;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1999. Proceedings., 1999 IEEE International Conference on
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5041-3
DOI :
10.1109/ICASSP.1999.758108
