Title :
Single and double frame quantization of LSF parameters using noise feedback coding
Author :
Fazel, A.R. ; Khandani, A.K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
Abstract :
We present a scheme for single frame (20 msec) and double frame (40 msec) quantization of line spectral frequency (LSF) parameters in a code-excited linear prediction (CELP) speech coder using noise feedback coding. To improve the performance, an appropriate lattice structure is used as the quantizer in the noise feedback loop. We also consider a switched structure based on using either a double frame quantizer or two single frame quantizers for two subsequent frames where an extra bit is used to specify the choice offering a lower distortion. Numerical results are presented showing an excellent performance with very low complexity
Keywords :
feedback; linear predictive coding; noise; quantisation (signal); spectral analysis; speech coding; CELP speech coder; LSF parameters; code-excited linear prediction; distortion; double frame quantization; lattice quantization; lattice structure; line spectral frequency; noise feedback coding; noise feedback loop; single frame quantization; speech coding; switched quantization; switched structure; Delay; Distortion measurement; Euclidean distance; Feeds; Filters; Linear predictive coding; Quantization; Speech analysis; Speech coding; Speech enhancement;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.936587
