18 Feb
2011
18 Feb
'11
10:28 p.m.
On Fri, Feb 18, 2011 at 09:19:27PM +0000, Folderol wrote:
Normally MC meters should be critically damped which means *no* overshoot.
But the VU was explicitly specified as underdamped. That is one of the reasons
why real VUs are not cheap: you can't use a general-purpose MC meter to make a
VU, you need one that was specifically designed for that purpose.
Ciao,
--
FA
isn't a
detail - it has quite a marked effect on the response.
Many software 'VU' meters use a first order lowpass - this doesn't
even come close to the response of a the real thing.
Hmmm.
Remembering my early training... In quality moving coil test meters this was
referred to as critical damping and not only gave the best response time but
also gave confidence that the meter needle wasn't sticking. With dead-band
damping where the needle slowed to a stop as it rose (or fell) you were always
tapping the glass because you weren't *quite* sure.