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Threshold of detection

Learn about dB HL, dB RETSPL, and dB SL in audiometry. Find conversion tools and see how 20 dB HL at 4000 Hz corresponds to SPL. Explore types of headphones and measurement methods. Discover essential instrumentation like audiometers and generators.

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Threshold of detection

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  1. Threshold of detection Established according to some criterion

  2. Other terms related to threshold • dB HL: Hearing level • dB RETSPL: Reference equivalent threshold sound pressure level • dB SL: Sensation level

  3. HL to RETSPL conversion (Table 3.2 in textbook) What is the SPL value corresponding to a 20 dB HL 4000 Hz tone? Is this the same for other types of headphones/sound field measurements?

  4. Instrumentation • Audiometer • Pure tone • Speech

  5. Pure tone generator Amplifier Attenuator Interrupter Headphone/ Insert earphone Bone conduction vibrator Pure tone audiometer

  6. Microphone/ CD/ Tape Amplifier Attenuator Interrupter Amplifier VU Meter Headphone/ Insert earphone Loudspeaker Speech audiometer

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