On Tue, Oct 17, 2006 at 11:56:20 +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 !
Right, the RMS envelope follower in SC* is a lowpass filter, though its
only a one pole IIRC, so it wont be steep enough to kill off everything in
the top end.
> A fast limiter needs a higher sample rate or interpolation
> anyway, just to detect the correct peak level. Remember that
> 'THE SAMPLES ARE NOT THE SIGNAL'. The real peak level of a
> signal when converted to the analog domain can be several
> dB above that of the highest sample.
True enough, and infact the SWH lookahead limiter doesn't upsample. It
probably should do, but it's quite expensive.
- Steve
Received on Wed Oct 18 00:15:02 2006
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