matlab下实现降噪，功率谱计算。％程序中设定采样点数为256个，采样频率为10000hz， ％输入信号为随机噪声和两个正弦的合成信号 ％设定的滤波器的截止频率为3500hz ％通过挈比雪肤滤波器，运行程序，比较滤波前后的频域波形 ％滤波去除了高频信号-matlab achieve noise reduction, power spectrum calculation. Sampling procedure set for 256 points, the sampling f

用窗函数法设计FIR带通滤波器。指标：低端通带截止频率wlp=0.35π 低端阻带截止频率wls=0.2π。高端通带截止频率whp=0.65π 高端阻带截止频率whs=0.8π。-Design of FIR with window function bandpass filter target: low-pass with cutoff frequency wlp = 0.35π low stopband cutoff frequency wls = 0.2π passband cutof

仿真巴特沃思、切比雪夫模拟低通滤波器的设计方法；利用模拟域频率变换设计模拟高通、带通、带阻滤波器的方法。-Simulation Butterworth, cut analog design method Chebyshev low-pass filter using an analog frequency domain converting analog design high pass, band pass, band stop filter method.

带通、高低通滤波器，自编好用，给出采样频率和上下截止频率即可使用。-band filter, high and low pass filters,given sampling frequency and the upper and lower cut-off frequency can be used.

巴特沃斯低通和高通滤波器程序，可以根据自己的需要设置截至频率。-Butterworth low-pass and high-pass filter program, you can set the cut-off frequency according to their needs。