On Mon, Nov 04, 2013 at 05:03:29PM -0700, Mark Anderson wrote: > I have often wondered if there was a way to confirm matrix encoding by using > a scope to display phase differences, but have found that not to be the case
It should be possible to do that, but the process will be a bit more complicated. Calculate a series of FFTs on overlapping windows, over the entire lenght of the recording, and look for components that have equal magnitude in L and R. If they were panned to center using a normal stereo pan pot they should be exactly in phase. If the signal is UHJ encoded AMB there will be a phase difference of around 35 degrees. If you find that consistently on all center front panned components that would be strong evidence of UHJ encoding. Looking at the complete signal it's probably impossible to decide if any phase difference is significant or not, you need the 'logic decoding' first. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
