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