Abstract
Sound field audiometry is used to estimate the hearing thresholds of children and in hearing aid evaluation and selection. The determination of hearing thresholds in the sound field is complicated by the presence of room modes in the test enclosure. These have the effect of selectively amplifying particular frequencies relative to others. The frequency response depends heavily on the position of the speaker and subject in the room. Slight imprecision in the stimulus frequency or the position of the subject can therefore result in substantial errors in threshold determination. This has led to the suggestion that stimuli other than sine waves be used in sound field audiometry. The requirement for frequency specificity imposes an upper limit on the bandwidth of the stimulus that can be used. Suggested stimuli include, frequency modulated tones, amplitude modulated tones, pulsed tones and narrow band noise. Comprehensive data are presented on the behavior of pure tones and the above stimuli in an audiometric ...
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