Improvements in 2.4 kbps high-quality speech coding

Author

Haagen, Jesper ; Nielsen, Henrik ; Hansen, Steffen Duus

Author_Institution

Telecommun. Res. Lab., Horsholm, Denmark

Volume

2

fYear

1992

fDate

23-26 Mar 1992

Firstpage

145

Abstract

An algorithm for 2.4 kb/s speech coding is described. The main problem addressed is the coding of voiced speech. A way of coding the pitch structure is introduced. Compared with traditional coding schemes, it results in a better compromise between bit allocation for short-term quantization and residual coding. The coder uses vector quantization of the short-term parameters (line spectrum frequencies). The residual is lowpass filtered to obtain the baseband signal. Unvoiced frames are coded by means of a method based on repetition and interpolation of pitch pulses. The method exploits the high correlation between pitch pulses. Harmonic postfiltering is applied to obtain an improved high-frequency regeneration

Keywords

linear predictive coding; speech coding; vector quantisation; 2.4 kbit/s; LPC; VQ; baseband signal; bit allocation; correlation; harmonic postfiltering; high-frequency regeneration; interpolation; line spectrum frequencies; low pass filter; pitch pulses; pitch structure; residual coding; short-term parameters; short-term quantization; speech coding; unvoiced frames; vector quantization; voiced speech; Acoustic noise; Bit rate; Encoding; Frequency; Interpolation; Linear predictive coding; Loudspeakers; Power harmonic filters; Speech coding; Vector quantization;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on

Conference_Location

San Francisco, CA

ISSN

1520-6149

Print_ISBN

0-7803-0532-9

Type

conf

DOI

10.1109/ICASSP.1992.226099

Filename

226099