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提出一种FIR数字滤波器的优化设计方法,即将遗传算法应用于频率采样法的FIR数字滤波器设计中。结合给定的FIR数字带通滤波器的技术指标,用遗传算法得到频率采样法中过渡带的最佳采样值,并分别用遗传算法与查表法对过渡带中采样点的频率采样法进行仿真实现。实验结果表明,采用遗传算法设计FIR数字滤波器可获得最大的阻带最小衰减,从而解决了传统查表法不能保证最优的问题。
An optimization method of FIR digital filter is proposed, which is to apply genetic algorithm to FIR digital filter design of frequency sampling method. Combined with the given technical index of FIR digital band-pass filter, the optimal sampling value of transition band in frequency sampling method is obtained by genetic algorithm, and the frequency sampling method of sampling point in transition band is carried out by genetic algorithm and look-up table respectively Simulation. The experimental results show that the FIR filter can obtain the maximum attenuation of the stopband with genetic algorithm, and thus solve the problem that the traditional look-up table method can not guarantee the best.