SOUND PAGE
Scott Bradley, Ph.D.
Department of Communication Sciences and Disorders
University of Wisconsin-Whitewater
Pure Tones
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500 Hz |
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1000 Hz |
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2000 Hz |
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4000 Hz |
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6000 Hz |
Periodic Complex Noises (square waves)
125 Hz fundamental |
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250 Hz fundamental |
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500 Hz fundamental |
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2000 Hz fundamental |
Aperiodic Complex Noises
White Noise |
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500 Hz center frequency |
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2000 Hz center frequency |
Synthetic Vowels
| / i / |
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"ah" (schwa) |
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/ u / |
Masking, Reverberation and Non-Linearities
| 100
msec delay |
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| 1500
- 1000 Hz difference tone |
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Masking 1000
Hz tone with 1000 Hz NBN |
Filters
| unfiltered
speech |
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low-pass filter |
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high-pass filter |
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bandpass filter
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| ear canal resonance |
Samples of Auditory Processing Disorder Tests
| uncompressed
speech |
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| 60% compression |
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| filtered speech
(800 Hz cutoff) |
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| unifiltered
speech |
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| speech in noise
(s/n=3 dB) |
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| dichotic stentences (sent 1 - sent 2 - dichotic) |
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| binaural fusion (low -high - both - original) |
Delayed Auditory Feedback and Pitch Shifting
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DAF - 200 msec |
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Pitch Shifting - 2 1/2 octaves |
Categorical Perception Example (effect of lengthening a vowel for voice perception)