Noise reduction method and system
AssigneeOticon A/S
InventorsMichael Syskind PEDERSEN, Jan M. DE HAAN, Andreas Thelander BERTELSEN, Matias Tofteby BACH, Rasmus Glarborg JENSEN, Franz TREUE, Kåre Tais CHRISTENSEN
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Abstract
The present disclosure provides methods and systems for reducing noise induced in one or more components in a hearing aid. The present disclosure provides methods for reducing noise induced in telecoils.
Claims20
A signal processing method for reducing noise induced in a component of a hearing aid, wherein the hearing aid comprises a battery, an active component powered by the battery, a noise sensitive component providing an output signal, and a processor powered by the battery, when the active component is operated so as to cause a power drain from the battery, the method comprising:
- initiating, upon detection of the active component transitioning from an inactive state to an active state, a noise reduction processing in the processor, which is performed on the output signal from the noise sensitive component, to reduce electromagnetic noise induced by the active component, by:
- obtaining a noise reduced signal by subtracting a scaled noise estimate b*N from a noisy signal S, based on the output signal, where the scaling factor b is given by E(SN*)/E(|N|{circumflex over ( )}2), where * denotes the complex conjugation and E( ) denotes the expectation.
A hearing aid comprising a battery, an active component powered by the battery, a noise sensitive component and a processor powered by the battery, the processor configured to obtain a measure of power drain from the battery, wherein the active component is configured to be operated so as to cause a power drain from the battery,
- the processor is configured to subtract a scaled noise estimate from an audio input signal from the noise sensitive component based on power usage.
Dependencies are inferred from the claim text.