Methods and apparatus for improved noise reduction for hearing assistance devices
First Claim
1. A hearing assistance device, comprising:
- a microphone; and
a processor configured to receive signals from the microphone; and
wherein the processor is configured to perform noise reduction which adjusts maximum gain reduction as a function of signal-to-noise ratio (SNR), and which reduces the strength of its maximum gain reduction for signal-to-noise ratio levels indicative of a signal of interest to reduce speech distortion,wherein the signal-to-noise ratio includes a time-varying coefficient of constancy (TVCC) to provide an estimate of the signal of interest compared to noise, and wherein the maximum gain reduction is minimized when the TVCC equals 0.
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Accused Products
Abstract
Disclosed herein, among other things, are methods and apparatus for improved noise reduction for hearing assistance devices. In various embodiments, a hearing assistance device includes a microphone and a processor configured to receive signals from the microphone. The processor is configured to perform noise reduction which adjusts maximum gain reduction as a function of signal-to-noise ratio (SNR), and which reduces the strength of its maximum gain reduction for intermediate signal-to-noise ratio levels to reduce speech distortion. In various embodiments, the hearing assistance device includes a memory configured to log noise reduction data for user environments. Also provided are methods to further adjust the noise reduction based on the logged information.
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Citations
20 Claims
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1. A hearing assistance device, comprising:
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a microphone; and a processor configured to receive signals from the microphone; and wherein the processor is configured to perform noise reduction which adjusts maximum gain reduction as a function of signal-to-noise ratio (SNR), and which reduces the strength of its maximum gain reduction for signal-to-noise ratio levels indicative of a signal of interest to reduce speech distortion, wherein the signal-to-noise ratio includes a time-varying coefficient of constancy (TVCC) to provide an estimate of the signal of interest compared to noise, and wherein the maximum gain reduction is minimized when the TVCC equals 0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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receiving signals from a hearing assistance device microphone in user environments; adjusting maximum gain reduction as a function of signal-to-noise ratio to perform noise reduction; and reducing the strength of the maximum gain reduction for signal-to-noise ratio levels indicative of a signal of interest to reduce speech distortion, wherein the signal-to-noise ratio includes a time-varying coefficient of constancy (TVCC) to provide an estimate of the signal of interest compared to noise, and wherein the maximum gain reduction is increased when the TVCC is greater than or less than 0. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification