Eberhard-karls-universitat Tubingen

Eberhard Karls University Tübingen

Dennis Zelle

Ernst Dalhoff

The present invention concerns a method for the detection of distortion products of otoacoustic emissions (DPOAE), comprising the steps: (a) output of at least one first pair of primary tones each consisting of a first primary tone with frequency fand sound pressure level Land a second primary tone with frequency fand sound pressure level Lwith f&#x3e;f, and (b) detecting evoked distortion products of otoacoustic emissions (DPOAE), characterized in that the first primary tone {f, L} is output with a time delay tafter the second primary tone {f, L}.

Method and apparatus for testing hearing ability

The automated determination of an individual function of a DPOAE level map with p=f(L, L) of human or animal hearing. The method may include reading into a main memory a model function with model parameters of a DPOAE level map, based upon a number of N DPOAE measurements of a stimulation frequency pair with respectively different level pairs in a population (p) of a population of normally hearing subjects, automatically presenting n different level pairs of a stimulation frequency pair via tone output means to an individual and detecting the corresponding DPOAE's of the individual via tone recording means, wherein at least the first level pair is predefined, iteratively adapting the model function to the measured n DPOAE's until an individual function is obtained with individual parameters of a DPOAE level map of the individual, outputting the individual function and/or its individual parameters.

Method for automatic determination of an individual function of a DPOAE level

In a method for examining the faculty of hearing for at least one ear of a mammal, in which growth curves are determined on the basis of the measurement of DPOAE's evoked by pairs of excitation signals (f, f) for different excitation frequencies f, the ear is presented with first excitation signals with a first excitation frequency fand a first noise level Land secondary excitation signals with a second excitation frequency fand a second noise level L. Pulse pairs with a first pulse of the first excitation signal and a second pulse of the second excitation signal are presented in the ear, and the DPOAE's evoked thereby are captured and evaluated. A set of at least two different pulse pairs with different second excitation frequencies fis presented in one block that is repeated several times during a measuring period.

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Tübingen, Germany

Dennis Zelle