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基于频谱校正的傅里叶变换滤波差分吸收光谱监测实验研究 被引量:1
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作者 郑海明 吴浩 李广杰 《动力工程学报》 CAS CSCD 北大核心 2014年第8期628-632,共5页
在差分吸收光谱(DOAS)傅里叶变换(FFT)滤波数据处理中引入频谱校正,针对单组分SO2和NO2气体进行了实验研究,并进行了模拟谱线漂移的实验.结果表明:对于单组分SO2和NO2气体,传统的最小二乘法与校正FFT滤波法均能取得不错的效果,误差在5%... 在差分吸收光谱(DOAS)傅里叶变换(FFT)滤波数据处理中引入频谱校正,针对单组分SO2和NO2气体进行了实验研究,并进行了模拟谱线漂移的实验.结果表明:对于单组分SO2和NO2气体,传统的最小二乘法与校正FFT滤波法均能取得不错的效果,误差在5%以下,但校正FFT滤波法较FFT滤波法的效果更好;在漂移2个波长时校正FFT滤波法的最大误差为3.65%,传统最小二乘法的平均误差为32.80%,前者效果明显优于后者. 展开更多
关键词 差分吸收光谱 污染气体监测 fft滤波法 频谱校正 谱线漂移
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Noise degradation system using Wiener filter and CORDIC based FFT/IFFT processor 被引量:2
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作者 Yasodai A Ramprasad A V 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第10期3849-3859,共11页
On augmentation of past work, an effective Wiener filter and its application for noise suppression combined with a formed CORDIC based FFT/IFFT processor with improved speed were executed. The pipelined methodology wa... On augmentation of past work, an effective Wiener filter and its application for noise suppression combined with a formed CORDIC based FFT/IFFT processor with improved speed were executed. The pipelined methodology was embraced for expanding the execution of the system. The proposed Wiener filter was planned in such an approach to evacuate the iteration issues in ordinary Wiener filter. The division process was supplanted by a productive inverse and multiplication process in the proposed design. An enhanced design for matrix inverse with reduced computation complexity was executed. The wide-ranging framework processing was focused around IEEE-754 standard single precision floating point numbers. The Wiener filter and the entire system design was integrated and actualized on VIRTEX 5 FPGA stage and re-enacted to approve the results in Xilinx ISE 13.4. The results show that a productive decrease in power and area is developed by adjusting the proposed technique for speech signal noise degradation with latency of n/2 clock cycles and substantial throughput result per every 12 clock cycles for n-bit precision. The execution of proposed design is exposed to be 31.35% more effective than that of prevailing strategies. 展开更多
关键词 Wiener filter ITERATIONS power spectrum fft/Ifft floating point noise suppression speech enhancement VLSI speed power area
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