The binaural free-field hearing threshold for pure tones

  • Poulsen, Torben (Project Manager)

    Project Details


    The binaural free-field hearing threshold for pure tones has been measured for thirty-one otologically normal test subjects (age: eighteen to twenty-five years). The pure-tone signals 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 duration of the signals was 1 s. The thresholds were determined with the bracketing method (ISO 8253-1, full version with three ascends and three descends) using a step size of 5 dB. The results are in good agreement with ISO 226 and ISO 389-7 at frequencies below 1 kHz and with other recent determinations of the free-field hearing threshold at high frequencies. At 1500 Hz a small peak in the threshold occurs, which is not reflected in the present standards due to lack of measurements at this frequency.
    The work is based on a MSc thesis by Loc Han. A paper (Poulsen and Han) has been accepted for publication during year 2000 in Acustica united with Acta Acustica.
    Effective start/end date01/01/199601/06/2000


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