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Apparatus for electrocochleography.

AbstractThe apparatus developed in our department for electrocochleography is described. The principle of enhancement of a weak biological signal from background noise by an average response computer is elucidated, with indication of the limitations. The frequency content of the effective tone-burst sound stimulus was calculated to estimate the frequency specificity of the stimulus.A description is also given of the signal switching circuitry used to make separate recordings of CM and AP simultaneously. Some details are given of a circuit permitting rapid determination of AP threshold values and input-output curves with tone-bursts.Because the apparatus was developed to be applicable for experimental work and for auditory evoked response audiometry, several special features were incorporated. A circuit for accurate measurement of latency, a double-synchronized tone-burst generator, and a dB-linear intensity ramp with I’M bursts are briefly described.A flexible trigger generator provides many trigger modes...