On Mon, Aug 24, 2009 at 01:38:37AM +1000, Fraser wrote: > > What's the point of using a meter if you adjust it to the signal ? > > You are not changing the signal, you are changing the amount of headroom the > VU > meter has. http://www.reference.com/browse/wiki/Headroom
Yes, I know that. Still same question: what's the point of using a meter if you adjust it to the signal rather than adjusting the signal until the meter says it's OK ? Of course a slow meter must be calibrated to show 0 well below full scale digital. But that should be fixed. > > Anyway the meter plugin freezes my machine if the signal is muted > > or removed. Probably due to denormals. > > I can't reproduce that. > A clue may help. (distro, arch, kernel, soundcard, host etc). I added some simple code to avoid denormals in the bandpass filter and in the 'envelope' calculation, and that removes the problem (just adding a small DC offset, 1e-20). > > The VU is not a VU, > > Correct since this plugin isn't in the analogue domain. So what ? If you call it VU and it looks like one, it should behave as a VU and have VU ballistics. This one surely doesn't. > > the spectrum doesn't use valid 1/3 octave filters by any standard, > > please advise where this standard is. For example IEC61260, or the BS/EN with the same number. > > and the phase meter doesn't indicate anything useful. > > Apart from the relative phase difference between the left and right channels. It measures an average of atan ((l-r)/(l+r))), which maybe related to phase for a sine wave with equal amplitude in both channels, but there it ends. Panning a sine wave L to R produces all values between 0 and 45. If it measures phase that should be 0. Anyway phase is not the thing to measure, correlation is. And this is certainly not a correlation meter, just compare it with a real one. Ciao, -- FA Io lo dico sempre: l'Italia รจ troppo stretta e lunga. _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
