Re: [Fwd: technical notes on data used by Martin Braun] (Martin Braun )


Subject: Re: [Fwd: technical notes on data used by Martin Braun]
From:    Martin Braun  <nombraun(at)POST.NETLINK.SE>
Date:    Sun, 17 Jun 2001 11:04:41 +0200

Question: It was asked if a technical bias in the GIPOS software package might have influenced some of the recently reported new findings (Braun, M., 2001, Speech mirrors norm-tones: Absolute pitch as a normal but precognitive trait, ARLO 2, 85-90.) Answer: GIPOS is a software for speech analysis and was developed at the Institute for Perception Research (IPO) in Eindhoven, Netherlands. A technical bias of this software concerning the frequency distribution of extracted f0 values can be excluded. Such a bias would have the same effect in the speech material of two speakers with the same pitch range. This, however, was never the case. After the analysis of the data of several thousand sentences of 15 speakers, I can say with certainty that GIPOS does not produce a technical distribution bias in the output of f0 values. Fig.2 of Braun (2001) http://ojps.aip.org/journal_cgi/dbt?KEY=ARLOFJ&Volume=LASTVOL&Issue=LASTISS also shows that the observed f0 distribution cannot be due to a technical artefact. Just compare the data between A3 and C4 in part A and part B. Martin Martin Braun Neuroscience of Music Gansbyn 14 S-671 95 Klässbol Sweden nombraun(at)post.netlink.se _______________________________________________________________________ ----- Original Message ----- From: Paul Boersma <paul.boersma(at)HUM.UVA.NL> To: <AUDITORY(at)LISTS.MCGILL.CA> Sent: Monday, June 11, 2001 7:09 PM Subject: Re: [Fwd: technical notes on data used by Martin Braun] > Is it likely that the measured F0 values had a spacing of 1/4 semitone? > It seems more likely that they were expressed as an entire number > of samples per period. For instance, for an F0 of 200 Hz you would > get 16k/200 = 80 samples per period. In that vicinity, then, the > spacing is 1 sample per period, or 1.25%, or just below one quarter > of a semitone, which seems to be consistent with what Bob Ladd remembers. _______________________________________________________________________ ----- Original Message ----- From: Alain de Cheveigne' <Alain.de.Cheveigne(at)IRCAM.FR> To: <AUDITORY(at)LISTS.MCGILL.CA> Sent: Wednesday, June 13, 2001 6:15 PM Subject: Re: [Fwd: technical notes on data used by Martin Braun] > Interactions between successive quantization operations (a sort of moire' > effect) can produce a very salient pattern even if the underlying > distribution is smooth. Of course this does not imply that such was the > case for the original study. _______________________________________________________________________ ----- Original Message ----- From: Paul Boersma <paul.boersma(at)HUM.UVA.NL> To: <AUDITORY(at)LISTS.MCGILL.CA> Sent: Saturday, June 16, 2001 8:24 PM Subject: Re: [Fwd: technical notes on data used by Martin Braun] > Nevertheless, I have been informed now that the pitch extraction method used > in Martin's measurements was subharmonic summation (Dik Hermes, JASA 1988), > as implemented in GIPOS. .......... > I have no access to the GIPOS implementation. .......... > Martin Braun's far-reaching claims about ACDEFG pitch preferences > should depend on an unbiased binning method, ..... _______________________________________________________________________


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Electrical Engineering Dept., Columbia University