AMR speech codec realization and optimization based on Tmscx55 DSP

Timeliness is the key requirement when AMR codec is realized in DSP. In this paper, the code optimization is implemented for the AMR codec when realizing on the TI® TMS320VC5509 DSP hardware platform. In order to improve the code efficiency, comprehensive assembly instructions are rewritten firstly after the comprehensive analysis on the AMR algorithm, and then hybrid coding is implemented to combine the advantage of C programming and DSP-based assembly language programming. The test on DSP verifies that the AMR codec realization and code optimization enhance the code efficiency and achieve satisfactory results.