基于FPGA+DSP架构的数字音频处理技术研究

为了解决航空机载环境下飞行员通话强噪声问题,提出了一种基于FPGA+DSP架构的数字话音处理系统.系统由模拟部分和数字部分组成,模拟部分完成话音信号的匹配、滤波、放大和AD/DA转换;数字部分设计了一种音频处理算法,对话音信号进行活动检测、噪声抑制和话音增强等处理.试验结果表明,该系统能够有效抑制通话噪声、增强话音信号,提高了飞行员通话的可懂度和舒适度.

Research on Digital Audio Processing Technology Based on FPGA+DSP Architecture

In order to solve the problem of the pilots'call strong noise under airborne environment,a digital audio processing system is pro-posed,which is based on FPGA+DSP architecture.The system consists of analog part and digital part.The voice signal matching,filte-ring,amplification and AD/DA conversion are provided by the analog part.An audio processing algorithm is designed in digital part, which achieves digital voice signal activity detection,noise suppression and voice enhancement and other processing.The experiment re-sults show that the system can effectively suppress calling noise,enhance voice signal,and improve the intelligibility and comfort of the pilot's calling.