Subject: Re: F0 difference limens for unresolved harmonics From: Katrin Krumbholz <katrin(at)IHR.MRC.AC.UK> Date: Wed, 20 Apr 2005 21:15:04 +0100Dear 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 David Klein wrote: > The 1994 JASA 95(6):3529 article of Shackleton and Carlyon indicates that > the difference limen (DL) for the residue pitch (F0) of complex tones > comprised only of unresolved harmonics is about 3%. This works out to be > about a half of a semitone. Other similar data has been surprisingly > tricky to track down. Is there a consensus on this ballpark F0 DL for an > unresolved harmonic complex? > > Also, is there a consensus on the existence of two separate pitch > mechanisms? :-) > > -- David Klein > > > > > > __________________________________ > Do you Yahoo!? > Yahoo! Mail - You care about security. So do we. > http://promotions.yahoo.com/new_mail -- Dr. Katrin Krumbholz MRC Institute of Hearing Research University Park Nottingham NG10 4NE Phone: +44 (0)115 922 3431 Fax: +44 (0)115 951 8503 This message has been checked for viruses but the contents of an attachment may still contain software viruses, which could damage your computer system: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.