[LAD] Determining Phase

Arnold Krille arnold at arnoldarts.de
Sun Jun 26 15:47:21 UTC 2011

On Sunday 26 June 2011 11:58:54 Jörn Nettingsmeier wrote:
> On 06/26/2011 10:50 AM, pshirkey at boosthardware.com 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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