Manually adjusting amplitude of audio

Question

Alex 2014-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/164992-manually-adjusting-amplitude-of-audio

回答： Anathea Pepperl 2014-12-10

I am trying to distort an audio file. How can I adjust the amplitude of the waveform so that the peaks are all maximized to a predetermined value? The idea is to be able to manipulate the amplitude level and thus manipulate the level of distortion. I am using a .wav file.

This is the effect I am looking for: http://en.wikipedia.org/wiki/Distortion#mediaviewer/File:Distortion_waveform.svg

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Answer 1

Anathea Pepperl 2014-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/164992-manually-adjusting-amplitude-of-audio#answer_161990

I'm assuming that you are using a .wav file. First you will want to use wavread to read the audio data into Matlab. Then you could use logical indexing, like audio_data(audio_data > thresh) = max_value; in order to force values above a certain value.

You could also find peaks by finding where the derivative is 0 (use the second derivative to find if that value is a min or a max), and set the local maxima to your predetermined value.

Hope this helps!