Title :
A low-complexity 4.6-kbit/s speech coder based on extremely truncated impulse response
Author :
Ohmuro, Hitoshi ; Mano, Kazunori
Author_Institution :
NTT Human Interface Labs., Tokyo, Japan
Abstract :
This paper proposes a new low-complexity 4.6-kbit/s speech-coding method. This method uses an extremely truncated impulse response (ETIR) that allows the distance between the input speech and the synthesized speech to be calculated very quickly. Also, a new method of distance measurement to search for the optimum code vector eliminates the negative effect of the extreme truncation. Our coding experiments have shown that the proposed truncation method does not cause a significant decline in speech quality even if the number of FIR filter taps is lowered to three, and that our 4.6-kbit/s coder achieves a weighted signal-to-noise ratio that is only 0.3 dB lower than when using the conventional full-tap coder with conventional distance measurement
Keywords :
FIR filters; filtering theory; linear predictive coding; speech coding; speech intelligibility; speech processing; speech synthesis; transient response; vocoders; 4.6 kbit/s; CELP type encoder; FIR filter taps; coding experiments; distance measurement; extremely truncated impulse response; full-tap coder; input speech; low-complexity speech coder; optimum code vector; speech coding; speech quality; synthesized speech; truncation method; weighted signal-to-noise ratio; Decoding; Distance measurement; Finite impulse response filter; Humans; Laboratories; Signal to noise ratio; Speech analysis; Speech coding; Speech processing; Speech synthesis;
Conference_Titel :
Speech Coding For Telecommunications Proceeding, 1997, 1997 IEEE Workshop on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-4073-6
DOI :
10.1109/SCFT.1997.623897
