基于滤波器组实现小波变换的方法研究与电路设计

发布时间：2018-05-08 04:12

本文选题：PSpice软件 + mG?C带通滤波器　；参考：《电子科技大学》2015年硕士论文

【摘要】：论文研究并测试全新的小波实现步骤:小波变换理论推导从而找到使用硬件实现的可能性—频域法模拟电路测试贴近小波变换—测试盒调整滤波器带通特性—滤波器组实现变换,通过严谨的理论分析和反复的实践操作,最终用由通道滤波器组构成的集成电路实现了小波变换信号滤波效果并通过检验。论文主要包括以下工作:(1)通过理论推导发现了小波变化的函数理论与滤波器的滤波过程高度一致,使得用模拟电路的滤波过程实现小波变换成为可能,进一步研究了实现连续变换的科学方法。(2)详细用函数演变的方法从理论角度推算小波变换的模拟步骤,针对小波变换的滤波器组件实现分别研究了不同种类的小波并针对性的选择初步实现图像处理的目标小波。(3)详细研究和对比了PSpice软件模拟电路结构和小波变换的过程。找到了PSpice软件在模拟阶段的频域特性、带宽精度和性价比三大解决方案,给出了基于复解调技术的连续小波变换频域法实现结构框图。(4)论文集中研究电流模式电路及mG?C带通滤波器,设计了中心频率可调的mG?C连续时间的二阶带通滤波器。论文研究和设计了片内自校正环节使得滤波器参数能自动调谐,保持了二阶带通滤波器初始赋值的计算准确,减少了误差,满足设计标准值在不同分析阶段都能保持基准值的预期,扩大了跨导输入级的传输特性,研究出能促进输入级传输特性线性程度改善的模式,获得了线性范围扩大的理想结果。(5)论文研究了串行和并行的滤波器组结构,设计了由并行通道滤波器组构成的集成电路,最后结合Matlab软件和PSpice软件实现小波变换的仿真模拟。为了更好的验证工程上的应用,用图像边缘处理的方式验证小波变换仿真模拟的实用性。
[Abstract]:This paper studies and tests a new wavelet realization step: wavelet transform theory derivation to find out the possibility of using hardware to realize the frequency domain analog circuit test close to wavelet transform-test box adjust filter bandpass characteristic-filter The wave-group implements the transformation, Through rigorous theoretical analysis and repeated practice, the wavelet transform signal filtering effect is realized with the integrated circuit composed of channel filter banks and tested. This paper mainly includes the following work: (1) through the theoretical derivation, it is found that the function theory of wavelet variation is highly consistent with the filtering process of the filter, which makes it possible to realize wavelet transform with the filter process of analog circuit. In this paper, the scientific method of realizing continuous transformation is studied in detail. The simulation steps of wavelet transform are calculated from the theoretical point of view by the method of function evolution. Aiming at the realization of filter components of wavelet transform, different kinds of wavelets are studied and the target wavelet of image processing is selected. (3) the structure of analog circuit and the process of wavelet transform of PSpice software are studied and compared in detail. In this paper, three solutions of PSpice software in frequency domain, bandwidth accuracy and cost performance ratio are found. The structure block diagram of frequency domain of continuous wavelet transform based on complex demodulation technique is presented. In this paper, the current mode circuit and mG?C bandpass filter are studied, and the second order bandpass filter with mG?C continuous time with adjustable center frequency is designed. In this paper, the on-chip self-tuning link is designed to automatically tune the filter parameters, which keeps the calculation accuracy of the initial assignment of the second-order band-pass filter and reduces the error. It meets the expectation that the design standard value can maintain the reference value in different analysis stages, expands the transmission characteristics of the transconductance input stage, and studies the mode that can improve the linearity of the input stage transmission characteristics. In this paper, the serial and parallel filter bank structures are studied, and the integrated circuit composed of parallel channel filter banks is designed. Finally, the simulation of wavelet transform is realized with Matlab software and PSpice software. In order to better verify the application in engineering, the practicability of wavelet transform simulation is verified by image edge processing.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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