Audibility and sound measurement

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Audibility and sound measurement

• SPHSC 509
• Lecture 1

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Example dB HL, dB SL
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Example dB HL, dB SL
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Effect of transducer
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Useful conversions
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RECD
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RECDREAR-2CCR

• 12 year old child with Down Syndrome
• Response is similar to that of a 1-month old
• Typical RECD for older children and adults is lt 5
  10 dB across frequencies
• http//www.boystownhospital.org/Research/areas/Cli
  nicalBehavioral/real_ear.asp

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REDD Difference in dB, across frequencies,
between the SPL measured in the real-ear and the
audiometer dial setting that produced it. Used to
convert to dB SPL with TDH phones
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SPLogram
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SPLogram speech spectrum
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LTASS
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Articulation Index
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Speech banana
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Speech sounds
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Stelmachowicz et al. Journal of Speech,
Language, and Hearing Research Vol. 46
649657 June 2003 Adults vs. 3-4 year old
talkers
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zero time waveform
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zero frequency spectrum
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Short-term spectra
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Wideband spectrogram of zeroPoor frequency
resolution but good time resolution
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Narrow band spectrogram of zeroPoor time
resolution but good frequency resolution