Abstract
The “minimum period of tonal quality” of a pure tone of 200–10000Hz was determined on 16 normal hearing persons by a new device for producing shortest tones. The individual variations are comparatively small. The “minimum period” is more or less independent of the tone intensity. The conductive apparatus of the ear responds to shortest tones aperiodically and behaves only under the influence of a longer tone as periodically vibrating system. Different forms of conductive deafness as otosclerosis or after radical mastoid operation had no influence on the “minimum period.” In perceptive deafness the “minimum period” is either partially shorter (presbyacusis) or throughout longer than normal.
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