On 2010-07-04 22:12, Mathieu Bouchard wrote: > The total delay is the sum of the logical delay as written in the audio > settings dialogue of Pd
i wouldn't give a groschen for what is written in the audio settings dialogue of Pd. i dare say that the value you see in the dialog jhas a direct relationship [1] to the actual delay you are experiencing. mfgasdr IOhannes [1] http://en.wikipedia.org/wiki/Direct_relationship > , plus the digital in-delay and out-delay of the > soundcard and/or driver, plus any analogue delay introduced by the > soundcard due to filtering, plus the microphone's delay, plus the > speaker's delay, plus the room's delay (relative to position and > orientation of both speaker and microphone). > > In the end, any digital delay can be counted by easy addition, whereas > the analogue delays are frequency-dependent and thus have to be counted > as filters. So, to measure a room's response, you'd first just subtract > the digital delay, but after that, for the analogue effects, you'd need > to deconvolve instead (but I suppose that you already know that). > > It may be tricky to know the digital delay beforehand... but if you put > the microphone and speaker really next (in)to each other, then just look > in your recording for the point when the response begins, then it might > be quite close to a digital delay, IF your impulsion contains enough > high-frequencies. But I don't know how close it is, as I haven't tried it. > > The total digital delay is soundcard-dependent, driver-dependent, and > OS-dependent, on top of being dependent on a setting in pd. > > _ _ __ ___ _____ ________ _____________ _____________________ ... > | Mathieu Bouchard, Montréal, Québec. téléphone: +1.514.383.3801 > > > > _______________________________________________ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list
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