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Real-Time Implementation of the G.729.1 Using ARM926EJ-S Processor Core  

So, Woon-Seob (한국전자통신연구원 멀티미디어통신연구팀)
Kim, Dae-Young (충남대학교 전자전파정보통신공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.8C, 2008 , pp. 575-582 More about this Journal
Abstract
In this paper we described the process and the results of real-time implementation of G.729.1 wideband speech codec which is standardized in SG15 of ITU-T. To apply the codec on ARM926EJ-S(R) processor core. we transformed some parts of the codec C program including basic operations and arithmetic functions into assembly language to operate the codec in real-time. G.729.1 is the standard wideband speech codec of ITU-T having variable bit rates of $8{\sim}32kbps$ and inputs quantized 16 bits PCM signal per sample at the rate of 8kHz or 16kHz sampling. This codec is interoperable with the G.729 and G.729A and the bandwidth extended wideband($50{\sim}7,000Hz$) version of existing narrowband($300{\sim}3,400Hz$) codec to enhance voice quality. The implemented G.729.1 wideband speech codec has the complexity of 31.2 MCPS for encoder and 22.8 MCPS for decoder and the execution time of the codec takes 11.5ms total on the target with 6.75ms and 4.76ms respectively. Also this codec was tested bit by bit exactly against all set of test vectors provided by ITU-T and passed all the test vectors. Besides the codec operated well on the Internet phone in real-time.
Keywords
Wideband speech codec; G.729.1; ARM926EJ-S; ADS; Real-time implementation;
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