The Binaural Free Field Hearing Threshold for Pure Tones from 125 Hz to 16 kHz
The binaural free field hearing threshold for pure tones has been measured for thirty-one otologically normal test subjects in the age range 18 to 25 years. The frequencies were 0.125, 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 9, 10, 11.2, 12.5, 14 and 16 kHz. The signal duration was
1 s measured between the half amplitude points of the rise and fall course. The pure tone signals were generated from disk files. The thresholds were determined with the Bracketing Method (ISO 8253-1) using a step sizeof 5 dB. The results are in good agreement with ISO 389-7 and with other
recent determinations of the free field hearing threshold. At 1500 Hz a small local peak in the threshold is seen which is not reflected in the present standards.
Document Type: Research Article
Publication date: 01 March 2000
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