A speech codec for cellular radio at a gross bit rate of 11.4 kb/s

Author

Hermansson, H. ; Minde, T.B. ; Ahlberg, J. ; Lundqvist, P.

Author_Institution

Ericsson Radio Syst. AB, Stockholm, Sweden

fYear

1991

fDate

14-17 Apr 1991

Firstpage

625

Abstract

A speech codec, called TRPE-HLTP (transformed binary regular pulse excitation, high-resolution long-term prediction) has been developed. It has been submitted as a candidate for the half-rate codec in the GSM (Group Special Mobile) system and its gross bit rate is 11.4 kb/s. The speech coding algorithm is of the type often called analysis-by-synthesis linear prediction. Its key elements are LSF (line spectral frequency)-coded spectral parameters, a high resolution closed-loop adaptive codebook, and a speech-trained low-complexity transformed binary regular pulse innovation generator, resulting in a net bit rate of 6.9 kb/s. The channel coding scheme consists of forward error correction with convolutional encoding, interleaving, and error detection

Keywords

cellular radio; codecs; digital radio systems; digital signal processing chips; encoding; error correction codes; error detection; filtering and prediction theory; speech analysis and processing; speech synthesis; 11.4 kbit/s; 6.9 kbit/s; GSM; Group Special Mobile; TMS320C30 DSP; TRPE-HLTP; analysis-by-synthesis linear prediction; bit rate; cellular radio; channel coding; closed-loop adaptive codebook; convolutional encoding; error detection; forward error correction; half-rate codec; high-resolution long-term prediction; interleaving; line spectral frequency; speech codec; speech coding algorithm; speech trained pulse innovation generator; transformed binary regular pulse excitation; Algorithm design and analysis; Bit rate; Frequency; GSM; Land mobile radio cellular systems; Pulse generation; Speech analysis; Speech codecs; Speech coding; Technological innovation;

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.1991.150417

Filename

150417