利用Matlab filterDesigner 工具生成FIR滤波器函数，并调用实现低通滤波

Posted 2021-12-14 毛毛虫的爹

https://blog.csdn.net/luobluesky/article/details/89143608

function Hd = untitled
%UNTITLED Returns a discrete-time filter object.

% MATLAB Code
% Generated by MATLAB(R) 8.6 and the Signal Processing Toolbox 7.1.
% Generated on: 16-Nov-2021 15:19:48

% Butterworth Lowpass filter designed using FDESIGN.LOWPASS.

% All frequency values are in Hz.
Fs = 520;  % Sampling Frequency

Fpass = 10;          % Passband Frequency
Fstop = 80;          % Stopband Frequency
Apass = 1;           % Passband Ripple (dB)
Astop = 60;          % Stopband Attenuation (dB)
match = 'stopband';  % Band to match exactly

% Construct an FDESIGN object and call its BUTTER method.
h  = fdesign.lowpass(Fpass, Fstop, Apass, Astop, Fs);
Hd = design(h, 'butter', 'MatchExactly', match);

% [EOF]

figure(1);
plot(ay(1:100860));
%hold on;
title('原始数据信号');
Hd = untitled
d = filter(Hd,ay);
d =d*(-9.8)+7.5;

figure(2);
plot(d(1:100860));
hold on;
plot(esp_lat(30:100890));
title('滤波数据信号');
legend('滤波ay * (-9.8)+7.5','esp_lat');