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Changing intensities (dB) of a sound file at certain frequencies?

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Sven Thole
Sven Thole 2016-6-15
回答： Sachin Shrestha 2016-6-15
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!
  1 个评论
Adam
Adam 2016-6-15
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.

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Star Strider
Star Strider 2016-6-15

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Sachin Shrestha
Sachin Shrestha 2016-6-15
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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