Transposed tones vs Gaussian impulses G. Christopher Stecker Dept of Speech & Hearing Sciences University of Washington.

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1 Transposed tones vs Gaussian impulses G. Christopher Stecker Dept of Speech & Hearing Sciences University of Washington

2 Background: stimuli for envelope ITD at high frequency –Sinusoidal amplitude modulation –Effects of modulation frequency, duration (Nuetzel & Hafter 1976) –Filtered impulse trains Independent manipulation of overall bandwidth and rate of modulation Analog Filtered Impulses: Hafter & Dye 1983, Hafter et al. 1990 Digital Gaussian Impulses: Buell & Hafter 1988, Hafter & Buell 1990, Saberi 1996, Stecker & Hafter 2002 –Transposed tones Proper comparison (given peripheral models) to low-freq tones van de Par & Kohlrausch 1997, Bernstein & Trahiotis 2002, Griffin et al. 2005.

3 SAM TT GI

4 SAM TT GI

5 SAM TT GI

6 SAM TT GI

7 SAM TT GI

8 SAM TT GI

9 SAM TT GI

10 SAM TT GI

11 SAM TT GI

12 SAM TT GI

13 Comparing signals Show figures

14 Comparing signals Show figures Differences: –GI has 2 parameters for bandwidth, rate –TT / SAM have 1 parameter for modulation rate –GI & TT have “off periods” and steeper slopes not found in SAM

15 Some data SAM (Bernstein & Trahiotis 2002) TT (Bernstein & Trahiotis 2002) GI (Buell & Hafter 1988) AI (Hafter et al 1990) AI (Hafter & Dye 1983)

16 Same data GI (Buell & Hafter 1988) AI (Hafter et al 1990) AI (Hafter & Dye 1983) SAM (Bernstein & Trahiotis 2002) TT (Bernstein & Trahiotis 2002)

17 Questions / Issues What are the important features of impulsive envelopes (for effective ITD)? Do rate limitation and binaural adaptation relate to one another? Onset vs Ongoing cues differ b/w studies. –What counts as “onset”?

18 Future developments? GI trains –Arbitrary timing –Dynamic parameters Transposed stimuli –Extend to many LF modulators (e.g. noise) Study of duration / rate / bandwidth?

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