Compute magnitude and phase response of voice data using FFT

How can I compute magnitude and phase response of voice data in my codes using FFT?

Answer 1

[Omega]

Hi Osman,

To compute the magnitude and phase response of your voice data using FFT in MATLAB, you can follow these steps:

1. Record and Get Audio Data: You have already done this using "audiorecorder" and "getaudiodata".
2. Compute the FFT: Use the "fft" function in MATLAB to transform your audio signal from the time domain to the frequency domain.
3. Calculate Magnitude and Phase: Use the results of the FFT to compute the magnitude and phase.

Here's a sample code:

% Insert code to Record and get audio data

N = length(myrec); % Length of the audio signal
Y = fft(myrec); % Compute the FFT
f = (0:N-1)*(44100/N); % Frequency vector

% Only take the first half of the FFT result (positive frequencies)
Y = Y(1:floor(N/2));
f = f(1:floor(N/2));

magnitude = abs(Y); % Magnitude response
phase = angle(Y); % Phase response

% Insert code to Plot magnitude and phase response

You can read more about the "fft()" MATLAB function by going through the documentation link:

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

I hope it helps!