Abstract

GARCIA PADILLA, Alexey et al. Voice enconding by means of lineal prediction coefficients embbeded on microblaze. Rev. cienc. tecnol. [online]. 2011, n.15, pp.53-60. ISSN 1851-7587.

In this work the design of an audio codec is presented for VoIP telephony, implemented on a microprocessor MicroBlaze embedded on a FPGA circuit of the Spartan 3E family. The design of the microprocessor is described first, and then, the peripherals to use, among which the handling of an external memory DDR and of a series interface RS232 allowing communication of the system with a PC computer. In this work, a variant of the algorithm LPC10 is implemented with speed of 2.4 Kb/s and the algorithms are implemented in the processor in C language. The evaluation of the system is made from the analysis of the data sent to the PC, which are analyzed with the Matlab processor and compared with simulated results. This piece of work is related to a task of the project"Platform of Commutation of Packages", approved by the MIC to the ISPJAE with participation of the UPR and GKT.

Keywords : Codec; FPGA; LPC-10; MicroBlaze; VoIP.

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