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

[Martin Braun <nombraun@xxxxxxxxxxxxxxx>]

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@post.netlink.se


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----- Original Message -----
From: Paul Boersma <paul.boersma@HUM.UVA.NL>
To: <AUDITORY@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@IRCAM.FR>
To: <AUDITORY@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@HUM.UVA.NL>
To: <AUDITORY@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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