Accession Number:

AD0744823

Title:

Pure-Tone Threshold with TDH-49 Earphones

Descriptive Note:

Progress rept. Jun 1971-May 1972

Corporate Author:

SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX

Personal Author(s):

• Sutherland, Jr., Harrell C.
• Gasaway, Donald C.

Report Date:

1972-06-01

Pagination or Media Count:

16.0

Abstract:

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.

Descriptors:

• *AUDIOMETRY
• *EARPHONES
• TEST METHODS
• TEST EQUIPMENT
• TABLES(DATA)
• CALIBRATION
• ACOUSTIC PROPERTIES

Subject Categories:

• Medicine and Medical Research
• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE