speech processing for your voice in Matlab

myvoice=audiorecorder

disp('Start Recording')

recordblocking(myvoice,10)

disp('End of Recording')

play(myvoice)

y=getaudiodata(myvoice);

plot(y)

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Answer 1

[Pooja Kumari]

Dear Liyan,

It is my understanding that you are facing issue with processing the voice and plotting the audio signal in time and frequency domain in MATLAB.

“audiorecorder” object with “SampleRate” property can be used to store Sampling Frequency i.e., “Fs”. You can refer to the below documentation for more information on “audiorecorder” function:

https://www.mathworks.com/help/matlab/import_export/record-and-play-audio.html

For converting the time domain audio signal to frequency domain, “fft”(fast fourier transform) function can be used. You can refer to the below document for more information on “fft” function:

https://www.mathworks.com/help/matlab/ref/fft.html

Below is the code for your reference:

myvoice = audiorecorder; % "audiorecorder" function is used to record audio data from an input device 
recDuration = 10; %time duration is taken as 10 sec
disp('Start Recording')
recordblocking(myvoice,10)
disp('End of Recording')
play(myvoice)
 
% Get the recorded data
y = getaudiodata(myvoice); %getting the data from recorded sound
 
Fs = myvoice.SampleRate; % Sample rate
 
X = fft(y);
f = linspace(0,Fs/2,length(y)/2+1); %Using Nyquist Sampling theorem
X = 20*log10(abs(X(1:length(y)/2+1))); % converting time domain to frequency domain with dB scale.

% Plot the recorded waveform in time domain
t = (0:length(y)-1)/fs; 
subplot(2,1,1);
plot(t, y);
xlabel('Time (s)');
ylabel('Amplitude');
title('Time-domain Signal');

% Plotting the frequency-domain spectrum
subplot(2,1,2);
plot(f, X);
xlabel('Frequency (Hz)');
ylabel('Magnitude (dB)');
title('Frequency-domain Spectrum');

I hope this helps!