Pure-Tone Threshold with TDH-49 Earphones
Progress rept. Jun 1971-May 1972
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX
Pagination or Media Count:
Pure-tone thresholds of 24 normal-hearing listeners were determined at 11 audiometric frequencies on two TDH-49 and two TDH-39 earphones. Thresholds were recorded in decibels of sound pressure level, as measured with a National Bureau of Standards type 9-A earphone coupler. Threshold data were used to compute appropriate calibration values for audiometers with TDH-49 earphones, reference Appendix F of ANSI S3.6-1969.
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