Real-time Implementation Of Multi-channel G.723.1 Speech Coder And Decoder Based On PNX1300

In this paper a detail introduction to the fundamental principle of ITU-T G723.1 encoding & decoding algorithms is firstly carried out. Subsequently, some main features about the fixed-point DSP chip PNX1300 such as hardware structure, embedded operating system running on PNX1300 DSPCPU are introduced. On the basis of the above introduction, this paper designs a set of feasible project running on PNX1300 for real time speech sampling, speech encoding, and playing aim to hardware structure characteristic of the chip. The key technologies with real time implementation of G723.1 speech coder on PNX1300 is discussed emphatically in this paper, which mostly include the design with systemic overall framework, material algorithm optimizations and the principle of program code optimizations which is generalized according to the structural feature of PNX1300 DSPCPU.The experiment shows that at least 5 ways of speech encoder and decoder can be carried out on single PNX1300 simultaneously.