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Is my plot is right ?

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tomer polsky
tomer polsky on 31 Jul 2018
Commented: Adam on 1 Aug 2018
I want to plot fft of my voice signal is my code is right ?
clc;
clear all;
close all;
Fs=96000; % Sampling frequency
T=1/Fs; % Sampling period
L = 450000; % Length of signal
t = (0:L-0)*T; % Time vector
recorder = audiorecorder(Fs, 24, 1);
pause(2)
disp('Start speaking.')
recorder.record(t(end));
while recorder.isrecording()
pause(0.1);
subplot(2,1,1);
plot(recorder.getaudiodata());
title('live recording of sound(t)')
Y=fft(recorder.getaudiodata());
drawnow();
end
disp('End of Recording.');
subplot(2,1,2);
P2 = abs(Y/L);
the_length_0f_P2=length(P2)
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);
f = Fs*(0:(L/2))/L;
plot(f,P1) ;
title('Single-Sided Amplitude Spectrum of X(t)');
xlabel('f (Hz)');
ylabel('|P1(f)|')

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tomer polsky
tomer polsky on 1 Aug 2018
the fft plot , I dont know if it is right
jonas
jonas on 1 Aug 2018
What is right is ambiguous. Unless you've got an error message, then matlab says it's wrong.
Adam
Adam on 1 Aug 2018
Why are you doing this:
Y=fft(recorder.getaudiodata());
in a while loop? You are just throwing away all the results apart from the last one.

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