High quality MELP coding at bit-rates around 4 kb/s

Author

Stachurski, Jacek ; McCree, Alan ; Viswanathan, Vishu

Author_Institution

Texas Instrum. Inc., Dallas, TX, USA

Volume

1

fYear

1999

fDate

15-19 Mar 1999

Firstpage

485

Abstract

A number of coding techniques have been reported to achieve near toll quality synthesized speech at bit-rates around 4 kb/s. These include variants of code excited linear prediction (CELP), sinusoidal transform coding (STC) and multi-band excitation (MBE). While CELP has been an effective technique for bit-rates above 6 kb/s, STC, MBE, waveform interpolation (WI) and mixed excitation linear prediction (MELP) models seem to be attractive at bit-rates below 3 kb/s. We present a system to encode speech with high quality using MELP, a technique previously demonstrated to be effective at bit-rates of 1.6-2.4 kb/s. We have enhanced the MELP model producing significantly higher speech quality at bit-rates above 2.4 kb/s. We describe the development and testing of a high quality 4 kb/s MELP coder

Keywords

interpolation; linear predictive coding; speech coding; speech intelligibility; transform coding; vocoders; 1.6 to 2.4 kbit/s; 4 kbit/s; CELP; MELP model; bit-rates; code excited linear prediction; high quality MELP coding; mixed excitation linear prediction; multi-band excitation; sinusoidal transform coding; speech coding; speech quality; testing; toll quality synthesized speech; waveform interpolation; Band pass filters; Digital signal processing; Frequency; Interpolation; Low pass filters; Predictive models; Research and development; Speech analysis; Speech synthesis; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1999. Proceedings., 1999 IEEE International Conference on

Conference_Location

Phoenix, AZ

ISSN

1520-6149

Print_ISBN

0-7803-5041-3

Type

conf

DOI

10.1109/ICASSP.1999.758168

Filename

758168