Transposed tones vs Gaussian impulses

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Transposed tones vs Gaussian impulses

• G. Christopher Stecker
• Dept of Speech Hearing Sciences
• University of Washington

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• 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.

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SAM
TT
GI
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SAM
TT
GI
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SAM
TT
GI
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SAM
TT
GI
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SAM
TT
GI
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SAM
TT
GI
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SAM
TT
GI
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SAM
TT
GI
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SAM
TT
GI
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SAM
TT
GI
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Comparing signals

• Show figures

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Comparing signals

• 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

• Show figures

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

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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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