From: malcolm@interval.com (Malcolm Slaney)
Date: Tue, 7 Mar 1995 14:04:13 -0800
Subject: Yost-Temporal Pitch (Friday Seminar!!!)
Message-Id: <v0211010bab826c20c01c@[192.203.7.70]>
I'm pleased to announce that Bill Yost, head of the Parmly Hearing
Institute at Loyola University in Chicago, will be visiting the Bay Area
this weekend and will be speaking at CCRMA on Friday morning.
Note! We have distinguished visitors for TWO Hearing Seminars this week:
Thursday (3/9) 11AM Jont Allen (Bell Labs) Speech Perception
Friday (3/10) 10AM Bill Yost (Loyola/Parmly) Pitch Perception
I highly recommend both talks and meeting both speakers!!!
Pitch perception is probably one of the most controversial topics in
auditory perception. Many people believe that we perceive pitch by looking
at the spectral profile. Others believe that we really do it by looking at
the temporal patterns. Which one is it? Are there sounds that can help
us tell the difference?
Bill will be describing his research using sounds called iterated rippled
noise and play some examples. The strength of the pitch percept, and the
results of psychophysical and physiological tests using chincillas can help
answer these questions and perhaps give us information on how sound
separation works. Come to CCRMA to hear more!
Who: William Yost (Parmly Hearing Institute, Loyola Univ., Chicago)
What: Pitch Might Really Be ALL in the Timing
When: *** Friday March 10 at 10AM <=== Additional Seminar this week
Where: CCRMA Library (Top Floor of the Knoll)
See you at CCRMA to meet two really wonderful visitors!
-- Malcolm
Title: "Pitch Might Really Be ALL in the Timing"
In recent years several hearing scientists have described the crucial role
that sound source determination or sound source segregation plays in
hearing (see for example Bregman, 1990; Hartmann, 1988; or Yost, 1992). An
important variable in allowing the audiotry system to determine the source
of sound is the auditory system's sensitivity to the harmonic structure of
many sounds in our everday world. The "case of the missing fundamental
pitch" spawn the realization that many complex stimuli produce a pitch that
is not a simple transform of the spectral or temporal characteristics of
the waveform. These stimuli characterize many sounds that occur in our
everday lives, including speech. The pitches produced by these complex
sounds have been labeled complex or virtual pitch. For many, if not most,
of these simuli the complex pitch of the sound occours along with other
perceptual attributes. That is, besides the complex pitch the sound may
also have a "tinny" or "noisy" timbre. Sometimes it is as if there are two
potential sound sources: that producing the complex pitch and a second
source that is responsible for the other timbrel percept. Since a major
role of hearing is the segregation of the various srouces that make up a
complex sound scene, these complex sounds offer a potential advantage for
studying sound source segregation.
In our presentation, we describe a class of complex pitch stimuli which we
call iterated rippled noise (IRN). IRN produces a complex pitch stimuli
sometimes called "repetition pitch" (see Bilsen and Ritsma, 1970; or Yost
and Hill, 1978), but in addition the IRN stimuli have a noisy timbre that
appears along with the repetition pitch much as if there were two sound
sources that generated the IRN stimulus. IRN typifies most complex pitch
simuli. We present human psychophysical evidence that IRN is processed
temporally and not spectrally. In addition we present some physiological
evidence from chinchillas showing the neural temporal sensitivity of units
in the cochlear nucleus to IRN. We show that the chinchilla is also
psychophysically processing ripple noise similarly to the way humans do.
And finally we show that autocorrelation of the stimulus, which can be
formed by an auditory correlogram or by the auditory image model (AIM) of
Patterson and Holdsworth (Patterson et al, 1992) can account for
essentially all of the data.
From: cel@trill (Carrie Lang)
Date: Tue, 7 Mar 1995 12:36:37 +0800
Subject: April 3 Mini Conference on African Phonetics and Phonology
Message-Id: <9503072036.AA10099@trill.>
Announcing
A Mini-Conference
on:
Phonetics and Phonology of
African Languages
3 April 1995
Center for Speech Communication
Systems, UC Berkeley
12 noon -- 5:00 pm
46 Dwinelle (tentative)
Featuring papers by:
Didier Demolin (Univ. Libre Bruxelles)
Jean-Marie Hombert (Univ. Lyon II)
Joyce Mathangwane (UCB)
Jeri Moxley (UCB)
Armindo Ngunga (UCB)
+ ?
RSVP (ohala@cogsci.berkeley.edu) so that we can
be sure that the room reserved is of sufficient
size.