Changing intensities (dB) of a sound file at certain frequencies?
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Sven Thole
on 15 Jun 2016
Answered: Sachin Shrestha
on 15 Jun 2016
Is there a way to parse through a sound file (in .wav format) and adjust (increase/decrease) its intensity in decibels at certain frequencies? I have tried to do FFT to get the frequency domain, then adjusting the magnitude of the soundfile by multiplying with a constant value. Then use ifft to return to the time domain.
[y1, Fs] = audioread('sound.wav');
Y = fft(y1);
% decrease intensity of lower frequencies
Y(1:1000)= Y(1:1000) .* 0.25;
y2 = ifft(Y);
soundsc(y2, Fs);
This does not work and gives the error : "Error using soundsc (line 25) Audio data must be real and floating point."
Here is an example of what I want to do in Matlab (0:50 - 1:20): https://youtu.be/YantpouC4Mk?t=50
Any help is appreciated, thanks in advanced!
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Adam
on 15 Jun 2016
If you don't alter the negative frequencies equally with the positive ones you will end up with a complex result when you use iift to return to the time domain.
Accepted Answer
Star Strider
on 15 Jun 2016
See my Answer to your duplicate Question on this topic: http://www.mathworks.com/matlabcentral/answers/290073-amplify-and-dampen-certain-frequencies
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More Answers (1)
Sachin Shrestha
on 15 Jun 2016
Hi Sven,
Regarding your error, you could listen to the audio by simply changing the last line of the code from
soundsc(y2, Fs);
to
soundsc(real(y2), Fs);
You may proceed with your testings now.
Hope this will help. Good Luck!
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