On Fri, Feb 18, 2011 at 09:19:27PM +0000, Folderol wrote: > > 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.
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 _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
