17 Oct
2006
17 Oct
'06
7:54 a.m.
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 !
A fast peak limiter could still do this. But even here it can
be avoided by look-ahead, i.e. having a short delay on the
audio which in turn allows a finite attack time.
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.
--
FA
Lascia la spina, cogli la rosa.