Re: [linux-audio-dev] Paper on dynamic range compression

From: Steve Harris <S.W.Harris@email-addr-hidden>
Date: Wed Oct 18 2006 - 12:45:02 EEST

On Tue, Oct 17, 2006 at 01:53:40 +0100, John Rigg wrote:
> On Tue, Oct 17, 2006 at 11:56:20AM +0200, Fons Adriaensen wrote:
> > On Mon, Oct 16, 2006 at 07:48:35PM +0100, Dan Mills wrote:
> > > The gain control signal has energy right the way out
> > > to the band limit (and probably aliased around it),
> > > never mind what happens when that hits the multiplier!
> >
> > The question is: how much of this HF energy is there ?
> > There shouldn't be much in a compressor with controlled
> > attack / release times. In that case it is always possible
> > to filter the control signal. In fact the obvious way to set
> > attack / release times is by such filtering !
>
> True, but if the audio signal contains significant HF energy near
> the band limit, it doesn't take a very fast gain change to push it
> past that. Bear in mind that the ear is _very_ sensitive to aliasing
> artifacts, so `significant' can be a very small amount.

These are aliasing artifacts in the sidechain though, right? So they will
show up as modulations in the output, rather than directly audible
aliasing.

- Steve
Received on Wed Oct 18 16:15:02 2006

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