关键词: 多带激励语音压缩, 牛顿迭代法, 定点, Leon3, 现场可编程门阵列（FPGA）

Abstract: The audio algorithm of Multi-Band-Excitation（MBE） is widely used in secret communication.Recently，secret-embedded audios based on MBE appear along with diversification of carrier.In order to ensure the safety of secret communication，the analysis and optimization of MBE algorithm are proposed.By the methods of optimizing the surd-sonant judge module，translating floating-point to fix-point，using iteration to realize evolution，inquiring table to realizing exceeding function and so on，experiments on the FPGA of SOC/Leon3 show that 45% of hardware resource is reduced and 29% of the real-time capability of algorithm is raised.These methods supplies a platform for steganalysis of MBE.

Key words: Multi-Band-Excitation（MBE）, iteration, fix-point, leon3, Field-Programmable Gate Array（FPGA）