共查询到16条相似文献,搜索用时 46 毫秒
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首次提出了二阶样条小波卷积分峰法, 通过二阶样条小波与重叠化学信号的卷积运算, 确定出各组分的峰位置和峰宽之比, 再利用样条函数构造峰分辨器, 分辨重叠信号, 同时给出了方法的理论依据, 并对参数的选择进行了讨论. 对大量仿真信号和实验信号的处理实践表明, 分辨后信号可以达到基线分离, 峰位置相对误差小于0.2%, 峰面积相对误差小于4.0%, 即使对于重叠严重的信号, 也能获得满意结果. 该方法可以直接用于含噪音的及多个峰的重叠体系, 是一种分辨重叠信号的有效新方法. 相似文献
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本文探讨采用平方根卡尔曼滤波进行卷积伏安重叠峰的分辨.模拟数据试验表明,1∶N平方根卡尔曼滤波器、结合标准加入法和快速傅里叶变换,用于重叠峰的分辨,具有较高的准确度和较强的分辨能力,滤波结果有良好的线性关系.用于In(Ⅲ)~Cd(Ⅱ)重叠响应信号的分辨,获得满意结果 相似文献
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小波包分析用于重叠分析化学信号的处理 总被引:8,自引:1,他引:8
对小波包分析的算法进行了改进,并将此算法成功地应用于多组分重叠色谱信号的解析.结果表明,本文提出的算法解决了MRSD算法的不足,更适合处理分析化学信号,用于重叠信号的解析时不需重构(逆变换),简化了数据处理步骤,加快了数据解析速度,具有较强的解析能力.对于重叠色谱信号的解析,小波包分析比小波分析具有更强的解析能力. 相似文献
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阶跃伏安法信号的样条小波分析 总被引:5,自引:0,他引:5
采用样条小波基处理低信噪比的阶跃伏安法离散数据。仿真实验和化学实验结果表明,样条小波分析含强白噪声的信号时,能保真地提取出有用信号,信噪比(S/N)降低至0.1~0.2.这种方法具有不需设置目标函数、窗口函数、初值估计等优点,同时运算简单、节省储存空间。因此,样条小波运用于信号分析较现行方法优越,并具有广阔的应用前景。 相似文献
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The normal distribution function is used as resolving factor and spline wavelet self‐convolution is used to resolve the overlapped peaks containing noise. The resolution of several kinds of overlapped peaks (SNR from 5 to 50) simulated by computer has been discussed in details. It is known that the overlapped peaks with noise can be separated (SNR > 50) directly and the noise is removed at the same time in time domain. Base‐line separation can be achieved. The relative errors of peak area and position are less than 5.0%. The satisfactory results are also obtained in resolving voltammetric overlapped signals by this method. 相似文献
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样条小波和Fourier变换联用技术在分析化学中的应用 总被引:4,自引:1,他引:4
探讨了样条小波和Fourier变换方法的算法及应用特征,将两种方法联合使用,设计出了一种新型的数字滤波器,使两种方法互相取长补短,使各自的优势能得到充分发挥.优选了处理低信噪比分析化学信号的滤波参数.不仅能使结果峰形高度保真,克服样条小波分析方法的不足,而且可对高噪声信号进行处理. 相似文献
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《Electroanalysis》2004,16(18):1514-1520
The wavelet derivative was developed for resolving overlapped signals in electrochemical analysis. It has been shown that the wavelet derivative could be used as an effective tool in resolution enhancement of the electrochemical signals. Since signal‐to‐noise ratio (SNR) does not degrade significantly at high order derivatives, the wavelet derivative is much better than the conventional numerical derivative in resolving practical signals with low SNR, particularly in the case when the overlapped degree of complex is high and high order derivatives are required for the further resolution enhancement. In this article, applications of the wavelet derivative in the voltammetric determination of small mounts of substances in the presence of large mounts of potentially interfering species are presented, and the advantages of this technique are discussed as well. 相似文献
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