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How can I use LPT-USB to trigger the output?

1 次查看（过去 30 天）
Junghee
Junghee 2013-12-9
关闭： Walter Roberson 2013-12-10
I have worked on some codes to filter the sound.
I asked few days ago if anybody knows how to turn LED light on by using LPT-USB port and MATLAB.. but nobody answered.
I have filtered the sound and have a frequency spectrum.
According to that specified frequency, I need to trigger the output with LPT-USB port.
Following is what I did so far.
% Reading wav file
b=wavread('/Users/*******/Desktop/traffichonk.wav');
% Selecting a portion (37s to 41s)
b1=b(44100*37:44100*41);
size(b1)
% FFT algorithm
n=176401;
fs=44100;
ts2=1/fs;
tmax2=(n-1)*ts2;
t2=0:ts2:tmax2;
f2=-fs/2:fs/(n-1):fs/2;
z2=fftshift(fft(b1));
% Plotting the sample b1
figure(1)
plot(t2,b1)
title('Plot of a Sound Sample');
xlabel('time(s)');
ylabel('Sound data');
% Plotting the Frequency Spectrum
figure(2)
plot(f2,abs(z2))
title('Frequency Spectrum');
xlabel('Frequency Hz');
ylabel('Amplitude');
% After bandpass toolbox is used, alert saying "The variable 'Hbp' has been
% exported to the command window.' will show up.
b2=filter(Hbp,b1);
z3=fftshift(fft(b2));
% Plotting the frequency spectrum after filtering
figure(3)
plot(f2,abs(z3))
title('Frequency Spectrum after Filtering');
xlabel('Frequency(Hz)');
ylabel('Amplitude');
% Checking the sound
soundsc(b2,44100)
I need to take live input in and send live output out... and I will use a microphone for a input device and LPT to USB port...(I found some info online- people said I could use LPT port to get output signal but I don't know if LPT-USB port is the right one)
Anyway, triggering the output or code for LPT-USB port.. anything is fine.
Please I'll appreciate any help.
Thanks

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