基于特里斯坦的答案,這里有一些Octave代碼可能與Matlab兼容,也可能不兼容. butter函數為您導出傳遞函數系數. .

hz = 8000;

x = [1:1:hz*10];

t = x./hz;

pi = 3.1415;

% Create signal with 10 hz, 200 hz and 500 hz components

raw_signal = sin(10*2*pi*t)+sin(200*2*pi*t)+sin(500*2*pi*t);

% View Raw Signal Over .1 Second Window

plot(t, raw_signal)

title('Raw Signal with 10Hz, 200Hz, 500Hz Components')

xlabel('Time (Sec)')

ylabel('Amplitude')

set(gca,'XLim', [5, 5.1]);

% Create Band Pass Butterworth Filter

[S_numer, S_denom] = butter(5, [100/hz 350/hz]);

band_passed_signal = filter(S_numer, S_denom, raw_signal);

% View Band Pass Filtered Signal Over .1 Second Window

plot(t, band_passed_signal)

title('Band Pass Filtered Signal')

xlabel('Time (Sec)')

ylabel('Amplitude')

set(gca,'XLim', [5, 5.1]);

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