Обработка сигналов
Радиоэлектроника
  • формат mcd
  • размер 159.04 КБ
  • добавлен 06 января 2011 г.
Digital Elliptic Filters Design
(jean Giraud, Luo Puolo) Проектирование цифровых эллиптических фильтров (на англ. яз. ) Два маткад-файла (открываются версией Маткада 2001i). В первом файле теория и определения функций для построения графиков: This document carries out design of a discrete-time elliptic lowpass filter. The user specifies the following parameters: passband edge, passband and stopband ripple, and filter order. Mathcad then calculates the remaining parameters and finds the zeros, poles, and coefficients for the filter transfer function. This procedure begins by computing the transfer function for a corresponding analog filter and then transforms the poles and roots of this function to produce the digital filter transfer function required.
For more information on the bilinear transformation used in this application, see Section 13.1: Analog/Digital Lowpass Butterworth Filter.
Во втором файле можно с помощью мышки менять три параметра фильтра: неравномерность в полосе пропускания, минимальное затухание в полосе поглощения и порядок фильтра (до 20), и при этом автоматически перерисовываются АЧХ фильтра (обычная и логарифмическая), а также расположение полюсов и нулей на комплексной плоскости.
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