Is my plot is right ?

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tomer polsky 2018-7-31

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https://ww2.mathworks.cn/matlabcentral/answers/412918-is-my-plot-is-right

评论： Adam 2018-8-1

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)|')