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US 2007/0183610 A1Published application
System and method for adaptive microphone matching in a hearing aid
AssigneeWidex A/S
InventorPreben Kidmose
Life of this patent
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AssigneeWidex A/S
InventorPreben Kidmose
Estimating the term…
A directional hearing aid (100) comprising at least two microphones (201, 202) has means (200) for matching differences in amplitude and phase between the two microphones (201, 202). The microphone matching means (200) compare differences between measured transfer functions of the microphone signal paths at a number of frequencies during use of the hearing aid (100), compares the differences to differences at similar frequencies in a model of the transfer functions of the microphone signal paths, derives a set of parameters based on the comparison, and adjusts the parameters in order to minimize the difference in level differences between the model and the microphones (201, 202). The model is then used to match the microphones (201, 202) mutually by applying appropriate control parameters (103, 104, 105, 106) to an adaptive matching filter (108) carrying one of the microphone signals.
A hearing aid comprising at least two microphone channels, an input converter, a signal processor, and an output transducer, each of the microphone channels comprising a microphone, wherein the signal processor comprises adaptive matching means for matching the microphone channels, means for measuring a first and a second transfer function of the microphone channels, means for generating a model of each of the first and the second transfer function of the respective microphone channels, and means for minimizing the difference between the model of the transfer functions and the measured transfer functions of the respective microphone channels by suitably controlling the adaptive matching means.
A method for matching two or more microphones in a hearing aid, including the steps of generating a model of the transfer function of a predetermined signal path, measuring the power function of the actual signal path of the individual microphones, comparing the measured transfer function to the modeled transfer function, deriving a set of parameters based on the comparison, and using the derived set of parameters to match the microphone signal paths according to the generated model.
A method for matching two microphone channels in a hearing aid, each microphone channel being adapted to convert an acoustic input into a processor input signal, the method comprising
Dependencies are inferred from the claim text.