On Tue, Jun 21, 2011 at 05:48:13PM -0400, S. Massy wrote: > I thought of that: one could split up the frequency range using a bunch > of chains with bandpass filters, but here again, how to measure and > report in a timely, readable matter? > > I'd rather go the simplest route possible, since I don't need anything > too fine-grained. Before you waste too much time on this: such metering is in general pretty useless, unless you are doing sound level monitoring to determine acoustic pollution levels to some official standard or something similar. And in that case you need very strictly specified hardware, filters, meter responses and postprocessing algorithms. For musical (mixing) purposes such a display may give you the illusion of providing some interesting info but it doesn't. Suppose you have a meter that displays the levels in say ten frequency bands. How would you use its output ? Try to make the levels equal, or fit them to some template ? If the purpose is to find which band is responsible for some peaks you want to reduce, forget it. Either things will be very clear and you can easily *hear* where the problem is, or you won't get any reliable output from your meter at all. The most useless of all would be a set of linearly spaced equal bandwidth filters as provided by a standard FFT. The least you need for musical use is perceptual filter set such as provided by japa. Note that japa (with its default resolution setting) computes more than 200 overlapping bands - way too much for any text based display. Ciao, -- FA _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
