17 Oct
2006
17 Oct
'06
10:06 a.m.
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:
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.
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 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