Efficient Implementation of G.729 Annex A Speech Codec On a Fixed-Point DSP

This paper describes the details of bit-exact and real-time implementation of ITU-T G.729 annex A speech codec on a fixed-point DSP processor. The DSP used for implementation is Texas Instruments’ high performance TMS320C6211. In addition to developed new DSPs with lower power consumption at higher clock speeds, the software development tools and compilers have also improved. Thus, the optimization and development process of the signal processing algorithms can be done with the reduced cost and time. In this paper we present some helpful methods for optimizing the G.729A speech codec mostly in high level programming. These techniques are applicable to any speech codec algorithms. Furthermore, the methods that are hardware independent can be used on other DSP processor platforms. Key-Words: Speech coding, G.729 standard, fixed-point DSP, real-time implementation