Implementation of a multi-channel G.723.1 Annex A using a DSP

Author

Yong-Soo Choi ; Chang-Kyu Ahn ; Tae-Ik Kang

fYear

2002

fDate

18-20 June 2002

Firstpage

320

Lastpage

321

Abstract

This paper describes a multi-channel G.723.1 Annex A (G.723.1A) implementation focused on code optimization using a general purpose digital signal processor (DSP), TMS320C62x (C62x). To implement a multi-channel G.723.1A, complexity of the ITU-T C-code was analyzed. Then we sorted and optimized C functions in complexity order. In parallel with optimization, we verified the bit-exactness of the optimized code using the ITU-T test vectors. Using only internal memory, the optimized code can perform full-duplex 16 channel processing. In addition, we further increased the number of available channels per DSP using fast algorithms, referred to as bit-compatible optimization.

Keywords

Internet telephony; digital signal processing chips; integrated voice/data communication; optimisation; vocoders; C function optimization; DSP; G.723.1 Annex A; G.723.1A; ITU-T C-code; ITU-T test vectors; TMS320C62x; VoIP; bit-compatible optimization; code optimization; complexity; digital signal processor; full-duplex processing; multi-channel implementation; vocoders; voice communication; voice over Internet protocol; Code standards; Commercialization; Costs; Digital signal processing; Digital signal processors; Instruments; Protocols; Signal processing algorithms; Testing; Vocoders;

fLanguage

English

Publisher

ieee

Conference_Titel

Consumer Electronics, 2002. ICCE. 2002 Digest of Technical Papers. International Conference on

Conference_Location

Los Angeles, CA, USA

Print_ISBN

0-7803-7300-6

Type

conf

DOI

10.1109/ICCE.2002.1014047

Filename

1014047