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# Human Audibility Curve Psychophysical Measurements Study Notes

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(Go over psychophysical measurements)
Auditory Sensitivity
- Absolute threshold
- Temporal integration
- Difference threshold
- Frequency
- Intensity
- Time
**Human audibility curve**
- Range between threshold to most intense sound
- 0-140 dB
- Frequency range: 20Hz-20,000Hz
- MAP = minimal audible pressure
- The ear has different sensitivities to each frequency
dB HL
- 0 dB HL = normal hearing threshold at 1000 Hz
- 0 dBHL:
- 13.5 dB SPL @ 500 Hz
- 7.5 dB SPL @ 1000 Hz
- 0 dB SPL @ 4k Hz
- 0 dB SPL = 20 uPa
Sensation Level
- Number of dB above threshold
- dBSL→ how many decibels above threshold
- 10 dB HL→ 0dBSL
- 50 dB HL→ 0 dBSL
**determine threshold, and determine above threshold
Ex: patient has threshold of 20 dB HL
Wants to present sound at 40 dB HL
What is dB SL?--> 20 dB SL
→ subtraction
Ex: Threshold is 10 dB HL
Wants to present sound at 60 dB SL
What is it in HL? → 70 dB HL
Duration (Temporal Integration)
- Integration of sound energy over time
- Intensity must increase to maintain audibility with decrease in duration
- 10-250 ms - 300 ms
- Threshold = constant power - Threshold = intensity in units of power

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(Go over psychophysical measurements) Auditory Sensitivity - Absolute threshold - Temporal integration - Difference threshold - Frequency - Intensity - Time **Human audibility curve** - Range between threshold to most intense sound - 0-140 dB - Frequency range: 20Hz-20,000Hz - MAP = minimal audible pressure - The ear has different sensitivities to each frequency dB HL - 0 dB HL = normal hearing threshold at 1000 Hz - 0 dBHL: - 13.5 dB SPL @ 500 Hz - 7.5 dB SPL @ 1000 Hz - 0 dB SPL @ 4k Hz - 0 dB SPL = 20 uPa Sensation Level - Number of dB above threshold - dBSL→ how many decibels above thres ...
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