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Electroacoustic calibration for sound field warble tone thresholds
1Memphis State University, TN.
The Journal of Speech and Hearing Disorders
|November 1, 1987
Summary
This study validates reference equivalent threshold sound pressure levels (RETSPLs) for sound field audiometry. Findings confirm RETSPLs are appropriate for electroacoustic calibration of warble tones in typical sound rooms.
Area of Science:
- Audiology
- Acoustics
- Psychoacoustics
Background:
- Reference equivalent threshold sound pressure levels (RETSPLs) were previously suggested for warble tones in semireverberant fields.
- The applicability of these RETSPLs in typical audiometric environments and with frequency modulated (FM) tones required evaluation.
Purpose of the Study:
- To assess the validity of established RETSPLs for warble tones in standard audiometric rooms.
- To compare earphone-based thresholds with sound field thresholds using FM tones.
Main Methods:
- Thresholds were measured for 6-11 normal-hearing participants across six frequencies.
- Measurements were conducted using earphones and in two distinct sound field environments.
- Frequency modulated (FM) tones were utilized in the sound field conditions.
Main Results:
- A small, statistically significant difference between earphone and sound field thresholds was observed in 4 out of 24 comparisons.
- Over 99% of sound field thresholds were within 10 dB of earphone thresholds in both tested sound fields.
- The results demonstrated high agreement between earphone and sound field measurements.
Conclusions:
- The evaluated RETSPLs are deemed appropriate for the electroacoustic calibration of sound field warble tones.
- The study supports the use of these RETSPLs in typical audiometric settings for sound field testing.
- Established RETSPLs provide a reliable basis for sound field audiometric calibration.