摘要
在模块法设计ＦＩＲ数字滤波器的基础上，提出一种设计ＦＩＲ数字陷波器的新方法。该方法将数字陷波器等效成为一个全通滤波器减去一个由基本频率单元构成的点通滤波器，进而推导出计算数字陷波器冲激响应的数学公式。该方法具有公式简单、物理概念清晰，陷波点频率不受模块数取整的约束，便于连续控制陷波点频率的优点。与窗口法设计相比，在同等凹口宽度下具有阶数减半的优点。同时，该方法可以推广至带阻滤波器的设计。
On the base of FIR digital filter design using building blocks, a new design method for FIR digital filter is presented. As the trap filter is equal to an all-pass filter minus a point-pass filter composed of approximate triangle shaped elementary frequency unit, the formula of calculating the impulse response of digital trap filter is induced. This method has several merits such as simple formula, clear physical conception, continuously controlled trap frequency that is independent on integral block number. Compared with windows method, this method can save half order number in condition of the same gap width. Meanwhile, this method can be extended to the design of band-stop filter.
出处
《信号处理》
CSCD
2002年第1期24-27,共4页
Journal of Signal Processing
基金
国家"863"计划
国家自然科学基金资助项目(60073053)
