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US 10,375,487 B2Granted
Method and device for filtering signals to match preferred speech levels
AssigneeStarkey Laboratories, Inc.
InventorsWilliam S. Woods, Tarun Pruthi
Life of this patent
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Abstract
Described herein are methods and devices for mixing input signals from multiple audio input sources in a hearing device such as a hearing aid. In one embodiment, a gain is applied to a telecoil signal where the gain is computed so as to depend on the level of a microphone signal. The technique does not depend on the user's audiogram and allows control of the gain for all environments with one adjustment.
Claims18
A hearing device, comprising:
- a first audio source component to produce a first input signal;
- a second audio source component to produce a second input signal;
- processing circuitry to process a combination of the first input signal and the second input signal into an output signal;
- a speaker to convert the output signal into an audio output;
- and,
- wherein the processing circuitry is further to:
- measure levels of the first and second input signals;
- derive a signal-to-noise ratio (SNR) as a ratio between the measured levels of the first and second input signals, respectively, the first input signal being regarded as signal (S) and the second input signal being regarded as noise (N);
- calculate a target value SNRpreferred for the SNR, either explicitly or by using a look-up table, as a function of the measured level of the second input signal;
- and,
- apply a gain G to the first input signal in a manner that attempts to maintain the SNR at the target value SNRpreferred where:
- G=SNRpreferred−S+N
- and where S is the measured level of the first input signal regarded as signal and N is the measured level of the second input signal regarded as noise.
10 more elements
A method for operating a hearing device, comprising:
- producing a first input signal from a first audio source component;
- producing a second input signal from a second audio source component;
- measuring levels of the first and second input signals;
- deriving a signal-to-noise ratio (SNR) as a ratio between the measured levels of the first and second input signals, respectively, the first input signal being regarded as signal (S) and the second input signal being regarded as noise (N);
- calculating a target value SNRpreferred for the SNR, either explicitly or by using a look-up table, as a function of the measured level of the second input signal;
- and,
- applying a gain G to the first input signal in a manner that attempts to maintain the SNR at the target value SNRpreferred;
- apply a gain G to the first input signal in a manner that attempts to maintain the SNR at the target value SNRpreferred where:
- G=SNRpreferred−S+N
- and where S is the measured level of the first input signal regarded as signal and N is the measured level of the second input signal regarded as noise;
- processing a combination of the first input signal and the second input signal into an output signal;
- and,
- converting the output signal into an audio output.
10 more elements
Dependencies are inferred from the claim text.