Re: autocorrelation (Jont Allen )

Subject: Re: autocorrelation
From:    Jont Allen  <jba(at)RESEARCH.ATT.COM>
Date:    Fri, 21 Jul 2000 11:32:05 -0400

Laurent Demany wrote: > > Peter Cariani wrote: > >I just made some isochronous click trains from harmonics of 100, > >both 3000-10000 and 5000-10000, and added the click trains to themselves, > >offset with a delay that ranged from 1-5 msec. (For example A = 1 msec, B > = 9msec). > >101000000101000000101000000 > >The 1 msec offset hardly masks the pitch at all, while there > >is a little masking by the time one gets to 3 and 4 msec, but not enough > >to obliterate the low pitch. None of these offsets changes the pitch. > >Now, if one assumed 1 spike per click, and a first-order interval > >representation, then the pitch should change and the 100 Hz pitch should be > >masked out (but it doesn't and isn't). > >What would be your interpretation of this? > > I guess that a significant part of the Auditory list is now tired of this > debate, but let me nonetheless come to the rescue of Christian (briefly): > Peter, the observation you report is not consistent with observations > described in the last paragraph of K&D's General Discussion. The > discrepancy can be explained by supposing that your filtered click trains > were not mixed with low-pass noise, which gave rise to spectral artifacts > (audible combination tones at low frequencies). > > Laurent Laurent, Christian, I am probably sticking my neck out here and showing my ignorance about your experiment, but did you actually look at your click trains with a filter? In otherwords, are you SURE that the HWR filtered click tran has a correlation that is not peaked at the pitch period? Your argument applies to the wideband signal, but does it apply to the filtered one? I hope I haven't said something really stupid here. It has been a while since I read the paper: (JASA vol 104(4), Oct. 1998, page 2298, right?). If I have, please forgive me. Jont -- Jont B. Allen AT&T Labs-Research, Shannon Laboratory, E161 180 Park Ave., Florham Park NJ, 07932-0971 973/360-8545voice, x7111fax, "You can't hope to win unless you know how to lose." "An expert is one who has made all the mistakes in a subfield." "Good judgment comes from experience, which comes from bad judgment." "Experience is what you get when you dont get what you want." -rlg

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