By using MATLAB signal and using window method, frequency sampling and Chebyshev approximation the design of low pass digital filter in the toolbox have been processed.
采用窗函数法、频率抽样法和切比雪夫最佳一致逼近法，通过调用Matlab信号处理工具箱中的函数设计低通数字滤波器。
In this studies, window structure's resonance frequency resulted in indoor low frequency noise pollution which come from traffic noise.
在本研究中，窗户结构共振频率造成了道路两侧住宅室内低频噪声污染。
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