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Re: Audio Compressor


From: Doug Stewart
Subject: Re: Audio Compressor
Date: Tue, 18 Aug 2020 10:12:32 -0400



On Tue, Aug 18, 2020 at 9:41 AM Renato S. Yamane <renatoyamane@gmail.com> wrote:
Hi,

Is there an Audio Compressor available in Octave?
https://www.mathworks.com/help/audio/ref/compressor-system-object.html  

I'm compressing my noises in the worst way, as you can see in the "while" condition on the example below.

In my way, the peaks will be "clipped", and I would like to avoid my stupid workaround:

====================
crest_factor = 6;
typenoise = noise(10*44100, 1, 'pink');
[z, p, k] = butter(4, [100/(44100/2), 500/(44100/2)]);
sos = zp2sos (z, p, k);
filtered = sosfilt(sos, typenoise);
normalized = filtered / (rms(filtered) / 10^(-crest_factor/20));

#{
Now I'm making an stupid workaround, as the audio file must be in
a range from -1 to +1:
#}

while (normalized(normalized > 1) || normalized(normalized < -1))
  normalized(normalized > 1) = 1;
  normalized(normalized < -1) = -1;
  normalized = normalized / (rms(normalized) / 10^(-crest_factor/20));
endwhile

audiowrite ('AudioFile.wav', normalized, 44100);
  ==================== 

Thanks in advance,
Renato 

There are many ways to do Audio Compression.
Tell us more about what you want to accomplish.


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