Acoustics - Statistical distribution of hearing thresholds of otologically normal persons in the age range from 18 years to 25 years under free-field listening conditions
This International Standard provides a method for calculating percentiles of the hearing threshold distributionwhose mean is the reference threshold value specified in ISO 226 and ISO 389-7. The mean and percentilethresholds are specified under the following conditions:a) the sound field in the absence of the listener consists of a free progressive plane wave (free field);b) the sound source is directly in front of the listener (frontal incidence);c) the sound signals are pure (sinusoidal) tones;d) the sound pressure level is measured in the absence of the listener at the position where the centre of thelistener's head would be;e) listening is binaural;f) t