Re: F0 difference limens for unresolved harmonics (Pierre Divenyi )

Subject: Re: F0 difference limens for unresolved harmonics
From:    Pierre Divenyi  <pdivenyi(at)EBIRE.ORG>
Date:    Wed, 20 Apr 2005 13:30:55 -0700

Katrin and David,

In an ARO presentation (1995, hopefully published one day), Steve Greenberg
and I used doubly-amplitude-modulated sinusoids in the ~~100-Hz f0 range,
with the carrier-carrier sometimes as high as 10KHz. We also saw that the
pitch DL in these conditions was between 6 and 10 percent, from which we
also inferred that when spectral mediation of pitch is seriously reduced or
altogether eliminated and only temporal cues are left, the DL's are similar
to those found in time discrimination.

Pierre

At 01:15 PM 4/20/2005, Katrin Krumbholz wrote:
>Dear David,
>
>Daniel Pressnitzer, Roy Patterson and I have conducted a series of
>experiments some time ago, in which we investigated the lower limit of
>pitch (LLP, or LLMP for lower limit of musical pitch) using (i) a melody
>task and (ii) a pitch discrimination task (Pressnitzer et al., 2001,
>Jasa 109 (5), 2074-2084; Krumbholz et al., 2000, Jasa 108 (3),
>1170-1180). In those two papers we show that (i) pitch discrimination
>threshold increases from about 1% for pitches above the LLP to about
>5-6% for pitches below the LLP (for cosine-phase harmonic tones; the
>discrimination threshold below the LLP depends on the nature of the
>stimulus). We also show that, contrary to common belief, the LLP does
>not actually correpond to the limit of spectral resolvability of
>harmonics: In the low-frequency region, the LLP appears to be a TEMPORAL
>rather than a SPECTRAL limit. Those two papers also contain a nice
>review of the previous literature.
>
>Daniel showed in his paper that the LLP can be modeled by the Meddis and
>Hewitt temporal pitch model, and I showed in a paper in the ISH book
>from 2001 that, unlike the temporal model, the optimum-processor
>spectral pitch net (SPINET) model is unable to explain the LLP for
>iterated rippled noises. I can send you pdfs/docs of those papers in a
>separate e-mail, if you are interested.
>
>Best wishes from Katrin