Title :
High quality mid-rate speech coding
Author :
Trancoso, I. ; Almeida, L. ; Marques, J. ; Rodrigues, J.
Author_Institution :
INESC/IST, Lisbon, Portugal
Abstract :
The authors present the results of a feasibility study comparing two basic classes of coders in the mid-rate range (6-8 kbps): CELP and sinusoid based coders. It is concluded that CELP coding is a mature technique able to yield high-quality synthetic speech with some background noise at the mid-rate range. It has a tractable computational complexity and good robustness, making it the best present candidate. Postprocessing can enhance its output quality, though further research is needed in this field. Sinusoidal coding, together with the use of narrowband basis functions, can produce synthetic speech of higher quality than that produced by CELP. Its robustness however, must be increased. This work suggests that a significant research effort into this technique is fully justified
Keywords :
speech analysis and processing; vocoders; 6 to 8 kbit/s; CELP; computational complexity; mid-rate speech coding; narrowband basis functions; sinusoid; synthetic speech; vocoders; Bit rate; Codecs; Digital circuits; ISDN; Investments; Land mobile radio; Robustness; Speech analysis; Speech coding; Speech processing;
Conference_Titel :
Electrotechnical Conference, 1989. Proceedings. 'Integrating Research, Industry and Education in Energy and Communication Engineering', MELECON '89., Mediterranean
Conference_Location :
Lisbon
DOI :
10.1109/MELCON.1989.50021