基于TMS320VC5509的核磁共振噪声自适应对消系统的实现  

Implementation of nuclear magnetic resonance (NMR) noises adaptive cancelling system based on TMS320VC5509

作　　者：柴林峰[1] 蒋留兵[1] 林和昀[1] 沈翰宁[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2011年第4期284-286,共3页Journal of Guilin University of Electronic Technology

基　　金：广西科学研究与技术开发计划项目(桂科攻0996028)

摘　　要：核磁共振成像系统强噪声的环境,使得语音通信系统无法正常工作,患者只有在系统停机的前提下才能与医生交流。针对强噪声环境,为了解决医生与患者交流的技术问题,采用最小均方误差自适应对消算法,设计基于TMS320VC5509的DSP语音信号处理硬件系统,针对实际环境和硬件进行编程,同时,分析了核磁共振噪声特性,对系统实时性进行优化,在保证系统信号流畅的前提下尽力提高消噪效果。实验环境信噪比接近0dB,通过实际场景测试,采集原始噪声与消噪后对比、分析,此设计能将信噪比提高到30dB以上。Because the nuclear magnetic resonance（NMR） technology is in high noise environment,the voice communication system does not work.Only patients under the premise of the system down time can communicate with the doctor.Aiming to solve the problem of communication between doctors and patients in high noise environment,minimum mean square error adaptive cancellation algorithm is adopted,which is based on the DSP TMS320VC5509 speech signal processing hardware system.The equipment which can fit for the actual environment is designed.In the same time,the system is optimized for real-time system,ensuring the system under the premise of the fluent signal flow and try to improve noise elimination effect.SNR in the experimental environment is close to 0 dB.Comparing and analyzing between original signal and canncelled signal in the actual scene,this design can improve SNR up to 30 dB or more.

关 键 词：自适应对消 语音增强 核磁共振语音降噪 

分 类 号：TN911.72[电子电信—通信与信息系统] P273[电子电信—信息与通信工程]