Re: Audio Compressor

On Tue, Aug 18, 2020 at 9:41 AM Renato S. Yamane <[email protected]>
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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