Speech Codec Optimization Based on Cell Broadband Engine

Cell broadband engine (CBE) is a multi-core processor jointly developed by Sony, Toshiba and IBM. The multi-SPE architecture makes it powerful for streaming media processing, such as voice over IP application. In this paper, a CBE based IP media server (IMS) architecture is proposed and the workloads of ITU-T G.723.1 and GSM-AMR encoder on CBE are analyzed with some preliminary optimization result from both CBE simulator and real CBE hardware. Branch instruction reduction, data level parallelism (SIMD), instruction level parallelism and aligned SPU local store access techniques are applied in our single precision floating-point based reference software optimization on cell. The performance we have achieved demonstrates the cell competence for computation intensity applications in telecom industry.