Embedded CELP coding for variable bit-rate between 6.4 and 9.6 kbit/s

Author

Drogo De Iacovo, R. ; Sereno, Daniele

Author_Institution

CSELT, Torino, Italy

fYear

1991

fDate

14-17 Apr 1991

Firstpage

681

Abstract

The authors consider the design of a variable-bit-rate CELP (code-excited linear prediction) coder which incorporates the facility of producing an embedded bit stream. This characteristic is particularly attractive for packet transmission where some packets can be lost or rejected whenever they are not received within the maximum allowed delay. The basic scheme used for the investigations is a CELP coder in which the innovation signal is split into three separate contributions. The sum of all contributions, together with the side information, determines the operating bit rate of 9.6 kb/s. The reduced bit rates of 8 and 6.4 kb/s can be achieved, dropping respectively the information relevant to one or two contributions to the innovation signal

Keywords

encoding; filtering and prediction theory; packet switching; speech analysis and processing; 6.4 kbit/s; 8 kbit/s; 9.6 kbit/s; CELP coder; code-excited linear prediction; delay; embedded bit stream; innovation signal; packet transmission; side information; speech coding; variable bit rate coding; Autocorrelation; Decoding; Degradation; Filters; Information analysis; Signal analysis; Speech analysis; Speech coding; Technological innovation; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on

Conference_Location

Toronto, Ont.

ISSN

1520-6149

Print_ISBN

0-7803-0003-3

Type

conf

DOI

10.1109/ICASSP.1991.150431

Filename

150431