[PD] change in compression detection

[Theron Trowbridge]

If you normalize the output of the filter you describe to the same peak
amplitude as the original, it's RMS value will certainly increase.  Having
the peaks at a common reference point is critical.


-Theron
^

On Tue, Jan 11, 2011 at 10:33 AM, Mathieu Bouchard <matju at artengine.ca>wrote:

> On Mon, 10 Jan 2011, Roman Haefeli wrote:
>
>  Assuming that the more compression is applied, the more the RMS amplitude
>> [1] approaches the Peak amplitude [2] of an audio signal,
>>
>
> Why do you assume that ? Let's say I take a signal and divide it by its
> recent peak volume. The output of [osc~] will stay unchanged. A signal made
> of plenty of sharp spikes will have a much lower RMS/peak ratio and still be
> unchanged.
>
> Are you confusing this with waveshaping such as [expr tanh($v1)] ? It may
> be a special case of compression, but is not what is usually meant by that.
>
> http://en.wikipedia.org/wiki/Dynamic_range_compression
>
>
>  _______________________________________________________________________
> | Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, Montréal, QC
>
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