| 根据数字滤波器的频率响应优选数字处理方法 |
| |
| 引用本文： | 王贵宣.根据数字滤波器的频率响应优选数字处理方法[J].地震,1993(4):63-71. |
| |
| 作者姓名： | 王贵宣 |
| |
| 作者单位： | 国家地震局分析预报中心 |
| |
| 摘 要： | 本文根据数字滤波器压制干扰的原理,指出利用数字滤波器的频率响应、优选数字处理方法和确定最佳滤波参数的具体原则。对于那些未给出频率响应函数或周期选择性函数的数字处理方法,可以直接根据计算方法的权系数算出它们的频率响应。计算递归滤波器的频率响应式子,也可以用来计算其它非递归滤波器的频率响应。本文利用重力固体潮汐分析中计算中心点的零点飘移值若干方法的系数和它们的周期选择性函数,分别计算了它们的频率响应,从两者的数值上比较,结果是一致的。本文还计算了目前大家常用的一些数字处理方法,如五日均值、一阶差分、二阶差分、多点数字平滑等方法的频率响应值。并分析了它们的处理效果和方法的局限性。还根据最佳数字滤波器和DAI数字滤波器的频率响应曲线,说明选择数字滤波器和确定最佳滤波参数的具体方法。
|
| 关 键 词： | 数字滤波器 频率 地震 数据处理 |
OPTIMUM SELECTING DIGITAL PROCESSING METHOD BASED ON FREQUENCY RESPONSE OF DIGITAL FILTER |
| |
| Wang Guixuan.OPTIMUM SELECTING DIGITAL PROCESSING METHOD BASED ON FREQUENCY RESPONSE OF DIGITAL FILTER[J].Earthquake,1993(4):63-71. |
| |
| Authors: | Wang Guixuan |
| |
| Abstract: | This paper proposed the concrete principles for using the frequency response of digital filter, optimum selecting digital processing method and determining the optimal filtering parameter according to the suppressing disturbance principle of digital filter. As for those digital processing methods which do not give the frequency response function or petiodic selectivity function, their frequency response can be directly calculated in accordance with the weight coefficient of computing methods. The equation which calculates the frequency response of the recursion filter can also be used to calculate other frequency response of non-reccursion filter. Using coefficients of some methods for calculating the zoro drift value at the central point in the gravity solid tidal analysis and their periodic selectivity function, this paper has computed their frequency responses respectively, the result of both numerical com-purisons is consistent. This paper also calculated the frequency response value of some digital processing methods used often by all, such as five-day average value, first-order difference, second difference, multipoint digital smoothing and others. The limitation and the processing effects of methods are also analyzed. Based on the frequency response curves of the optimum digital, filter and DAI digital filter, the author here also presents the specific method for selecting the digital filter and determining the optimal filtering parameers. |
| |
| Keywords: | digital filter frequency response function of periodic selectivity weight coefficient |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
