Method of detecting a defect in a hearing instrument, and hearing instrument
First Claim
1. A method of detecting a defect in a hearing instrument having a first input transducer and an output transducer, the method comprising:
- determining a first transfer function of a first acoustic system including the output transducer and the first input transducer;
determining at least a first reference function for the first transfer function;
comparing the first transfer function with the first reference function;
detecting a defect in the hearing instrument based on a result of the comparing step;
determining a second transfer function of a second acoustic system comprising the output transducer and a second input transducer of the hearing instrument;
determining a second reference function for the second transfer function;
comparing the second transfer function with the second reference function;
detecting a defect in the hearing instrument based on a comparison of the first transfer function with the first reference function and based on a comparison of the second transfer function with the second reference function;
detecting a defect of one or both of the first input transducer and the output transducer;
predetermining a first limit value, a second limit value and a third limit value;
taking a first difference from the first transfer function and the first reference function;
taking a second difference from the second transfer function and the second reference function;
taking a third difference from the first transfer function and the second transfer function; and
detecting a defect at the first input transducer when the first difference exceeds the first limit value in at least one frequency range, while the second difference does not exceed the second limit value; and
/ordetecting a defect in the output transducer when frequency ranges exist for the first difference and second difference respectively in which the first limit value or the second limit value is exceeded, yet the third difference does not exceed the third limit value.
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Abstract
A method for detecting a defect in a hearing instrument that has at least one first input transducer and at least one output transducer. A first transfer function of a first acoustic system, which includes the output transducer and the first input transducer, is determined, and at least a first reference function for the first transfer function is determined. The first transfer function is compared with the first reference function and a defect in the hearing instrument is detected based on the comparison. A hearing instrument with an input transducer and an output transducer is set up to carry out the method.
14 Citations
16 Claims
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1. A method of detecting a defect in a hearing instrument having a first input transducer and an output transducer, the method comprising:
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determining a first transfer function of a first acoustic system including the output transducer and the first input transducer; determining at least a first reference function for the first transfer function; comparing the first transfer function with the first reference function; detecting a defect in the hearing instrument based on a result of the comparing step; determining a second transfer function of a second acoustic system comprising the output transducer and a second input transducer of the hearing instrument; determining a second reference function for the second transfer function; comparing the second transfer function with the second reference function; detecting a defect in the hearing instrument based on a comparison of the first transfer function with the first reference function and based on a comparison of the second transfer function with the second reference function; detecting a defect of one or both of the first input transducer and the output transducer; predetermining a first limit value, a second limit value and a third limit value; taking a first difference from the first transfer function and the first reference function; taking a second difference from the second transfer function and the second reference function; taking a third difference from the first transfer function and the second transfer function; and detecting a defect at the first input transducer when the first difference exceeds the first limit value in at least one frequency range, while the second difference does not exceed the second limit value; and
/ordetecting a defect in the output transducer when frequency ranges exist for the first difference and second difference respectively in which the first limit value or the second limit value is exceeded, yet the third difference does not exceed the third limit value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of detecting a defect in a hearing instrument having a first input transducer and an output transducer, the method comprising:
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determining a first transfer function of a first acoustic system including the output transducer and the first input transducer; determining at least a first reference function for the first transfer function; comparing the first transfer function with the first reference function; detecting a defect in the hearing instrument based on a result of the comparing step, wherein the defect is a defect of one or both of the first input transducer and the output transducer; and detecting the defect by performing a set of steps selected from the group consisting of a first set and a second set; wherein the first set includes;
determining a measure for a correlation between the first transfer function and the first reference function, and detecting the defect based on the measure of the correlation; andwherein the second set includes;
determining a first polynomial which approximates the first transfer function, determining a first reference polynomial which approximates the first reference function, and detecting the defect by comparing coefficients from the first polynomial and the first reference polynomial.
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Specification