摘要: Hearing faculty test apparatus, for use in relation to the inner ear by way of so-called cochlear echo, repeatedly applied a linearly balanced set acoustic stimuli ear, individually sums each related responses set, interrogates sum detect components above predetermined threshold, and averages on selective basis depend interrogation. Preferably are passed averaging only when whooly within threshold. Also, is preferably two like averagers which accepted alternating manner, with being fed correlator.