On Sunday 26 June 2011 11:58:54 Jörn Nettingsmeier wrote: > On 06/26/2011 10:50 AM, [email protected] wrote: > >> Other than that, I'd make a really cool spectrum analyzer that ran the > >> Fourier analysis on two channels, correlated their phases then made a > >> +/- line vs. frequency for all to see so that the phase of the > >> components of the spectrum could be watched for phase relationships. > that is precisely what dual-fft tools for p.a. system calibration do, > and they're extremely useful. > they allow you to constantly monitor the system with _program_ material, > without having to use MLS noise or any other specific measurement signal. > one channel is used for the direct signal from the mixer, the other is > fed by a measurement microphone with delay compensation. you get instant > phase and amplitude response. good systems also give you an additional > "confidence" curve that tells you how much you can trust which parts of > the spectrum. for instance, if your program material is a boy soprano, > the confidence of the measurement in the low end is practically zero.
I use(d) japa for this :-) Altough that lacks phase display...
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