Title :
A 1.7 kb/s MELP coder with improved analysis and quantization
Author :
McCree, Alan ; De Martin, J.C.
Author_Institution :
DSPS R&D, Texas Instrum. Inc., Dallas, TX, USA
Abstract :
This paper describes our new mixed excitation linear predictive (MELP) coder designed for very low bit rate applications. This new coder, through algorithmic improvements and enhanced quantization techniques, produces better speech quality at 1.7 kb/s than the new U.S. Federal Standard MELP coder at 2.4 kb/s. Key features of the coder are an improved pitch estimation algorithm and a line spectral frequencies (LSF) quantization scheme that requires only 21 bits per frame. With channel coding, this new MELP coder is capable of maintaining good speech quality even in severely degraded channels, at a total bit rate of only 3 kb/s
Keywords :
channel coding; linear predictive coding; spectral analysis; speech coding; vector quantisation; vocoders; 1.7 kbit/s; 3 kbit/s; MELP coder; channel coding; line spectral frequencies quantization scheme; low bit rate coding; mixed excitation linear prediction; pitch estimation algorithm; quantization; speech coding; speech quality; Background noise; Bit rate; Channel coding; Code standards; Filters; Frequency estimation; Linear predictive coding; Quantization; Speech analysis; Synthesizers;
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4428-6
DOI :
10.1109/ICASSP.1998.675334
