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用于SPR检测的自消噪光电二极管阵列驱动电路 被引量:3
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作者 王程 张维 +2 位作者 牛文成 岳钊 刘国华 《传感技术学报》 CAS CSCD 北大核心 2011年第4期522-526,共5页
以检测SPR现象为目的,设计了一种新型的具有自消噪功能的光电二极管阵列驱动电路。该电路可以精确检测矩形区域内的光强分布,从而确定SPR共振角。电路选用滨松光子学株式会社(Hamamatsu)生产的S3903-1024Q型光电二极管阵列线性图像传感... 以检测SPR现象为目的,设计了一种新型的具有自消噪功能的光电二极管阵列驱动电路。该电路可以精确检测矩形区域内的光强分布,从而确定SPR共振角。电路选用滨松光子学株式会社(Hamamatsu)生产的S3903-1024Q型光电二极管阵列线性图像传感器作为光电转换器件,并以改进型电流积分方式进行驱动,可以根据检测环境的噪声条件自适应消噪。经实验证明,设计的具有自消噪功能的光电二极管驱动电路显著抑制了信号中的噪声分量,使输出信噪比提高10 dB以上。 展开更多
关键词 SPR 光电二极管阵列 电流积分电路 自消噪
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Application of RLS adaptive filteringin signal de-noising 被引量:6
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作者 程学珍 徐景东 +1 位作者 卫阿盈 逄明祥 《Journal of Measurement Science and Instrumentation》 CAS 2014年第1期32-36,共5页
In view of the problem that noises are prone to be mixed in the signals,an adaptive signal de-noising system based on reursive least squares (RLS) algorithm is introduced.The principle of adaptive filtering and the ... In view of the problem that noises are prone to be mixed in the signals,an adaptive signal de-noising system based on reursive least squares (RLS) algorithm is introduced.The principle of adaptive filtering and the process flow of RLS algorithm are described.Through example simulation,simulation figures of the adaptive de-noising system are obtained.By analysis and comparison,it can be proved that RLS adaptive filtering is capable of eliminating the noises and obtaining useful signals in a relatively good manner.Therefore,the validity of this method and the rationality of this system are demonstrated. 展开更多
关键词 DE-NOISING adaptive filtering recursive least squares (RLS) algorithm
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Bit-stream linear artificial neural networks based on Sigma-delta modulation 被引量:2
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作者 梁勇 Wang Zhigong +1 位作者 Meng Qiao Guo Xiaodan 《High Technology Letters》 EI CAS 2012年第2期120-123,共4页
To solve the excessive huge scale problem of the traditional multi-bit digital artificial neural networks (ANN) hardware implementation methods, a bit-stream ANN construction method based on direct sigma-delta (Z-A... To solve the excessive huge scale problem of the traditional multi-bit digital artificial neural networks (ANN) hardware implementation methods, a bit-stream ANN construction method based on direct sigma-delta (Z-A) signal processing is presented. The bit-stream adder, multiplier and fully digital X-A modulator used in the bit-stream linear ANN are implemented in a field programmable gate array (FPGA). A bit-stream linear ANN based on these bit-stream modules is presented and implemented. To verify the function and performance of the bit-stream linear ANN, the bit-stream adaptive predictor and the bit-stream adaptive noise cancellation system are presented. The predicted result of the bit-stream adaptive predictor is very close to the desired signal. Also, the bit-stream adaptive noise cancellation system removes the electric power noise effectively. 展开更多
关键词 bit-stream artificial neuron SIGMA-DELTA linear artificial neural networks field programmablegate array (FPGA)
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Removal of noises from electromagnetic radiation of coal or rock with EEMD-adaptive morphological filter 被引量:1
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作者 CHEN Shi-hai WANG En-yuan 《Journal of Coal Science & Engineering(China)》 2012年第3期330-336,共7页
The electromagnetic radiation (EMR) signal collected by monitoring system during coal or rock dynamic disaster may be interferred easily by electromagnetic noises in mines. The noises have a direct influence on the ... The electromagnetic radiation (EMR) signal collected by monitoring system during coal or rock dynamic disaster may be interferred easily by electromagnetic noises in mines. The noises have a direct influence on the recognition and analysis of the EMR signal features during the disaster. With the aim of removing these noises, an ensemble empirical mode decomposition (EEMD) adaptive morphological filter was proposed. From the result of the simulation and the experiment, it is shown that the method can restrain the random noise and white Gaussian noise mixed with EMR signal effectively. The filter is highly useful for improving the robustness of the coal or rock dynamic disaster monitoring system. 展开更多
关键词 coal or rock dynamic disaster electromagnetic radiation EEMD morphological filter DENOISING
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A method of multi-channel reference signals acquiring in broadband ANC
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作者 马令坤 黄建国 张立杰 《Journal of Marine Science and Application》 2008年第3期190-194,共5页
In a flank array on an unmanned underwater vehicle (UUV), self-generated noise which has broadband and colored spectrum property in frequency and spatial domain is the main factor affecting the performance of weak s... In a flank array on an unmanned underwater vehicle (UUV), self-generated noise which has broadband and colored spectrum property in frequency and spatial domain is the main factor affecting the performance of weak signal detection, so the technique of adaptive noise cancellation (ANC) as well as physical denoising and active noise cancellation are often used in practice. Because ANC is based on correlations, improvements in performance come from better correlation between reference signals and primary signals. Taking full advantage of the characteristics of flank arrays and the characteristics of information obtained from hydrophones, a new method for reference signal acquisition for adaptive noise cancellation is proposed, in which the multi-channel reference signals are obtained by accurate delaying for a given direction of arrival (DOA) and differencing between adjacent outputs of array elements. The validity of the proposed method was verified through system modeling simulations and lake experiments which showed good performance with little additional computational burden. 展开更多
关键词 weak signal detection adaptive noise cancellation multi-channel reference signal
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Automatic Stabilization of an Adaptive Feedback Control for Noise Cancelling In-ear Headphones
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作者 Sven Hoeber Christian Pape Eduard Reithmeier 《Journal of Mechanics Engineering and Automation》 2016年第7期364-372,共9页
Headphones with an integrated active noise cancellation system have been increasingly introduced to the consumer market in recent years. When exposing the human ear to active noise sources in this striking distance, t... Headphones with an integrated active noise cancellation system have been increasingly introduced to the consumer market in recent years. When exposing the human ear to active noise sources in this striking distance, the ensuring of a safe sound pressure level is vital. In feedback systems, this is coupled with the stability of the closed control loop; stable controller design is thus essential. However, changes in the control path during run-time can cause the stable control system to become unstable, resulting in an overdrive of the speakers in the headphones. This paper proposes a method, which enables the real-time analysis of the current system state and if necessary stabilizes the closed loop while maintaining the active noise reduction. This is achieved by estimating and evaluating the open loop behavior with an adaptive filter and subsequently limiting the controller gain in respect to the stability margin. 展开更多
关键词 Active noise cancellation feedback control stability analysis.
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Fast Affine Projection Algorithm for Adaptive Noise Canceling and Its Application on the Fetal Electrocardiogram Extraction 被引量:1
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作者 宫延伟 吉小军 +1 位作者 黄峰一 阮晓虹 《Journal of Shanghai Jiaotong university(Science)》 EI 2009年第6期690-694,共5页
Aimed at the problem of adaptive noise canceling(ANC),three implementary algorithms which are least mean square(LMS) algorithm,recursive least square(RLS) algorithm and fast affine projection(FAP) algorithm,have been ... Aimed at the problem of adaptive noise canceling(ANC),three implementary algorithms which are least mean square(LMS) algorithm,recursive least square(RLS) algorithm and fast affine projection(FAP) algorithm,have been researched.The simulations were made for the performance of these algorithms.The extraction of fetal electrocardiogram(FECG) is applied to compare the application effect of the above algorithms.The proposed FAP algorithm has obvious advantages in computational complexity,convergence speed and steadystate error. 展开更多
关键词 adaptive noise canceling (ANC) least mean square (LMS) algorithm recursive least square (RLS) algorithm fast affine projection (FAP) algorithm fetal electrocardiogram (FECG)
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