I designed a four-band AGC for broadcast about 20 years ago, using single-pole 
subtractive band split filters. I used RMS detection, and wanting each band’s 
processing to be doing roughly equal ‘work,’  determined the crossover 
frequencies on the basis of typical energy distribution. This worked out to 
around 150 Hz, 500 Hz and 1800 Hz, and the processor sounded extremely natural 
on pretty much all sources.

Kind Regards,

David Reaves
Recklinghausen, German

> On Mar 23, 2018, at 5:01 PM, music-dsp-requ...@music.columbia.edu 
> <mailto:music-dsp-requ...@music.columbia.edu> wrote:
> Date: Fri, 23 Mar 2018 15:05:47 +0100
> From: gm <g...@voxangelica.net <mailto:g...@voxangelica.net>>
> To: music-dsp@music.columbia.edu <mailto:music-dsp@music.columbia.edu>
> Subject:
> Message-ID: <ba3456f4-1b94-3fb6-a5a6-1702cb485...@voxangelica.net 
> <mailto:ba3456f4-1b94-3fb6-a5a6-1702cb485...@voxangelica.net>>
> Content-Type: text/plain; charset=utf-8; format=flowed
> The purpose is multiband compression and distortion.
> So I only have a few bands, 2 to 5.
> I use ERB scale in my vocoder, which worked slightly better than Bark 
> scale for me (it seems better defined at the low range)
> I was wondering if I should use it here too or if it's better on a log2 
> scale.
> Also I cant decide what upper and lower frequency I should use when I 
> divide evenly on a log scale.
> I chose 100 Hz cause thats the lowest Bark band I think.

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