### ASA 125th Meeting Ottawa 1993 May

## 5aPP8. Edge pitches of complex tones obtained at high frequencies.

**Armin Kohlrausch
**

**
Adrianus J. M. Houtsma
**

**
Sebastiaan J. Kloos
**

**
**
*Inst. for Percept. Res./IPO, P. O. Box 513, 5600 MB Eindhoven, The
Netherlands
*

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The upper edge pitch of harmonic complex tones was matched by adjusting
the frequency of a sinusoidal comparison tone. Complexes with upper-edge
frequencies between 2 and 8 kHz and fundamental frequencies of 50, 100, and 200
Hz were synthesized by adding all harmonics with equal amplitudes and with zero
phases. Tones and intertone gaps had durations of 500 ms. Stimuli were
presented diotically through Etymotic ER-2 insert earphones at a sound-pressure
level of 60 dB. Five subjects performed ten matches for each complex, from
which the standard deviation (s.d.) was calculated and expressed as percentage
of the edge frequency. The s.d. generally increased with the edge frequency and
with the fundamental frequency. For 50-Hz fundamental, the s.d. was only a
factor two larger than in a sine-on-sine match, and four of the five subjects
could perceive the edge pitch up to 8 kHz. For higher fundamental frequencies,
more and more subjects lost the pitch percept at high edge frequencies, and for
200 Hz only one subject consistently matched the edge pitch at 8 kHz. The
results emphasize the role of temporal processes in the perception of edge
pitch as well as the importance of phase locking at the frequency of the edge
component.