Secondly , contrast and comparison of current demodulation methods is done . on the basis of choice of the method of f - p tunable filter , how to design the signal acquisition and processing board is told in detail . every part of the board is analyzed specifically 接着对现有的光纤光栅解调方案进行了分析和比较，并针对实际光纤传感应用中所面临的问题，在选用了f - p腔可调谐滤波法基础上设计了信号处理卡的软硬件，同时对该卡的各个组成部分的实现也进行了具体的介绍。
If the computation complexity is permitted , we can combine two methods together , which is the improvement trend of noise estimation . there are many speech enhancement techniques , such as filtering , correlation of speech , nonlinear processing , spectrum subtraction , and the adaptive wiener filter 语音增强算法,包括滤波法语音增强、利用相关特性的语音增强、非线性处理语音增强、谱减法语音增强、利用wiener滤波法的语音增强、自适应噪声抵消法语音增强等,我们采用的是目前使用最为广泛的基于短时谱的语音增强算法。
( 2 ) four methods of lower - layer image processing technique were studied . b gray level histogram segment method was adopted to segment the tomato from the background . to eliminate all kinds of noise , the quickly median filtering was adopted to filter the tomato image . the histogram pureline transfer was put into effect in order to increasing image . the method of lower - layer image processing technique could satisfy the demand of bruise detection and classification 利用区域阈值法对所采集图像的b分量进行图像分割；用快速中值滤波法较好地去除图像采集过程中受到的各种噪声干扰；用线性灰度变换进行图像增强；所研究的图像低层处理方法能满足进一步进行番茄表面缺陷检测和分类的要求。
The principles of filtering , wavelet - denoise and integral algorithms to pick up the tilting pulse ( filtering - delay - compensation signal ) are discussed . especially , a " high - in & low - out " method is presented to determine the thresholds in the three algorithms ; it is very robust and adaptable . in the end , the performance of the three algorithms is compared to each other based on the process of total data of one test - on - line 分别设计了滤波法、小波去噪法和积分法来提取倾摆脉冲(滤波延时补偿信号) ，论述了这三种算法提取倾摆脉冲的原理，提出了一种鲁棒性好、适应性强的“高进低出”法来确定三种提取倾摆脉冲算法中的门限值：最后用这三种算法对一次线路试验的全部数据进行了处理，并比较了各种算法的特点。
We propose a chaos - based generation of the random ppm - ps signals , design and implement a generator of the ppm - ps signals . we introduce an if sampling technique and simulate the performances of digital demodulation techniques of using hilbert filters , sine filters , bessel filters and poly - phase filters . the poly - phase filtering method can achieve the higher mirror - frequency rejection ratio by using the low order filters 介绍了中频采样技术，并对希尔伯特滤波法、辛格内插函数修正、贝赛尔函数插值法及多相滤波法等数字解调算法进行了计算机仿真和性能比较，指出多相滤波法能以较低的阶数实现较高的镜频抑制比。
3 . starting from analyzing the form mechanism of “ honeycomb ” noise , we discuss eight different methods seriously to remove the noise on the basis of analyzing the foreign literatures . comparing with the result of every method , we select the median filter which has higher efficiency and better effect finally 3 .从介绍“蜂窝”噪声形成机理出发,在分析国外相关文献的基础上,详细讨论了八种去除“蜂窝”噪声方法,通过对各种方法的处理结果的详尽比较,选择了效率高、整体效果好的中值滤波法。
The fiber grating sensor theory and technology is systematically researched in this paper . the main content includes : the principle of fiber grating sensor ; the analysis of several technologies of demodulation and the f - p filter demodulation is introduced in detail ; the design of demodulation system based on dsp 本文对光纤光栅传感器的基本理论和技术进行了系统的研究，主要内容包括：光栅的传感机理分析；对比分析了光纤光栅的常用解调方法，重点介绍了可调谐f - p滤波法解调原理；基于dsp解调系统的设计方法与实验验证。
Based on a lot of experiments , the statistics law of gps positioning data is found and the simple multiple digital filter algorithm that suits the single chip microco ntroller is adopted to optimize the positioning data . the positioning precision is improved effectively . according to the optimization result , the vertical scan line algorithm is used to discriminate the position status of navigation mark 选用gps接收机采集航标的位置信息，通过大量的实验总结出gps定位数据的统计规律，使用简单的适合单片机使用的复合数字滤波法优化定位数据，有效提高定位精度，并根据优化结果，采用垂直扫描线算法判别航标的位置状态。
In the course of remote sensing digital image preparation , the paper , based on many experiments , chooses histogram match for radiation correction , texture filter method for strip noise reduction , and , with tm image in 1996 as the standard , carries out geometric correction and re - sampling of multi - band combined colored image by means of binary multinomial and closest pixel , with the error of one pixel 在遥感数字图像预处理中,通过多次试验,采用纹理滤波法消除条带噪声,以96年tm影像为参考标准进行二阶多项式几何精校正和最邻近像元法重采样,误差控制在1个像元内。
