Hearing apparatus and method for reducing an interference noise for a hearing apparatus
First Claim
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1. A hearing apparatus, comprising:
- a first reduction unit for reducing stationary interference noises of an input signal;
a second reduction unit for reducing non-stationary interference noises oriented spatially in respect of the hearing apparatus; and
a selection facility for selecting at least one of said first or second reduction units for an output signal to be formed from the input signal, said selection facility making a selection in dependence on a criterion for a stationarity of the input signal, said selection facility, as a criterion for the stationarity, selects one of a value of an attenuation factor of said first reduction unit or an estimated value for a signal-to-noise ratio of said first reduction unit, wherein the attenuation factor of said first reduction unit is restricted to small values by means of an anchor gain value and in which an attenuation can be generated by means of said second reduction unit, the attenuation corresponding to a value for the attenuation factor smaller than the anchor gain value.
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Abstract
A noise reduction is provided for a hearing apparatus, with which both stationary and also non-stationary interference noises can be attenuated in an input signal. An output signal is in this way to convey a quite sound impression. A signal processing is provided, which effects a noise reduction on the basis of two different methods. Provision is made on the one hand for a noise reduction for stationary interference noises and on the other hand for a noise reduction for spatially oriented interference noises. A selection facility selects between the two noise reductions.
16 Citations
6 Claims
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1. A hearing apparatus, comprising:
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a first reduction unit for reducing stationary interference noises of an input signal; a second reduction unit for reducing non-stationary interference noises oriented spatially in respect of the hearing apparatus; and a selection facility for selecting at least one of said first or second reduction units for an output signal to be formed from the input signal, said selection facility making a selection in dependence on a criterion for a stationarity of the input signal, said selection facility, as a criterion for the stationarity, selects one of a value of an attenuation factor of said first reduction unit or an estimated value for a signal-to-noise ratio of said first reduction unit, wherein the attenuation factor of said first reduction unit is restricted to small values by means of an anchor gain value and in which an attenuation can be generated by means of said second reduction unit, the attenuation corresponding to a value for the attenuation factor smaller than the anchor gain value. - View Dependent Claims (2, 3, 4)
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5. A method for reducing an interference noise for a hearing apparatus, which comprises the steps of:
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analyzing an input signal in respect of stationarity, as a criterion for the stationarity, selecting one of a value of an attenuation factor of a first reduction unit or an estimated value for a signal-to-noise ratio of the first reduction unit, wherein the attenuation factor of the first reduction unit is restricted to small values by means of an anchor gain value and in which an attenuation can be generated by means of a second reduction unit, the attenuation corresponding to a value for the attenuation factor smaller than the anchor gain value; combining a noise reduction for stationary interference noises and a noise reduction for non-stationary spatially oriented interference noises in dependence on a result of the analyzing; and generating an output signal from the input signal by means of the combined noise reductions. - View Dependent Claims (6)
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Specification