Back to results
US 12,706,077 B2Granted
Audio limiter
AssigneeBose Corporation
InventorsEmery Ku, Benjamin Isaac Raubvogel, Michael S. D'Agostino
Life of this patent
Estimating the term…
Abstract
A method is performed by active noise reduction (ANR) headphones. The method includes comparing a feedback microphone signal to a predicted feedback microphone signal representing what the feedback microphone signal would be expected to look like if there were no leak between the headphones and a user wearing the headphones. An audio limiter is adaptively adjusted based, at least in part, on the comparison.
Claims11
A method performed by active noise reduction (ANR) headphones comprising:
- comparing a feedback microphone signal to a predicted feedback microphone signal representing what the feedback microphone signal would be expected to look like if there were no leak between the headphones and a user wearing the headphones;
- and
- adaptively adjusting an audio limiter based, at least in part, on the comparison, wherein comparing the feedback microphone signal to the predicted feedback microphone signal comprises providing the feedback microphone signal and the predicted feedback microphone signal as inputs to a leak detector,
- wherein the leak detector comprises a high-pass filter and wherein comparing the feedback microphone signal to the predicted feedback microphone signal comprises filtering the predicted feedback microphone signal with the high-pass filter to provide a high-pass filtered signal, and
- wherein comparing the feedback microphone signal to the predicted feedback microphone signal comprises determining an error signal corresponding to a difference between the feedback microphone signal and the high-pass filtered signal, and the method further comprises:
- providing the error signal to an adaptive algorithm, and
- using output of the adaptive algorithm to update a transfer function of the high-filter.
4 more elements
A method performed by active noise reduction (ANR) headphones comprising:
- comparing a feedback microphone signal to a predicted feedback microphone signal representing what the feedback microphone signal would be expected to look like if there were no leak between the headphones and a user wearing the headphones;
- and
- adaptively adjusting an audio limiter based, at least in part, on the comparison, wherein comparing the feedback microphone signal to the predicted feedback microphone signal comprises providing the feedback microphone signal and the predicted feedback microphone signal as inputs to a leak detector,
- wherein the leak detector comprises a high-pass filter and wherein comparing the feedback microphone signal to the predicted feedback microphone signal comprises filtering the predicted feedback microphone signal with the high-pass filter to provide a high-pass filtered signal, and
- wherein the audio limiter is adjusted based on a center frequency value of the high-pass filter.
2 more elements
An active noise reduction (ANR) audio output device, comprising:
- a memory comprising computer-executable instructions;
- and
- a processor configured to execute the executable instructions and cause the audio output device to:
- compare a feedback microphone signal to a predicted feedback microphone signal representing what the feedback microphone signal would be expected to look like if there were no leak between the ANR audio output device and a user wearing the ANR audio output device;
- and
- adaptively adjust an audio limiter based, at least in part, on the comparison,
- wherein the computer-executable instructions for comparing the feedback microphone signal to the predicted feedback microphone signal comprise instructions for providing the feedback microphone signal and the predicted feedback microphone signal as inputs to a leak detector,
- wherein the leak detector comprises a high-pass filter and wherein comparing the feedback microphone signal to the predicted feedback microphone signal comprises filtering the predicted feedback microphone signal with the high-pass filter to provide a high-pass filtered signal, and
- wherein the computer-executable instructions for comparing the feedback microphone signal to the predicted feedback microphone signal comprise instructions for:
- determining an error signal corresponding to a difference between the feedback microphone signal and the high-pass filtered signal and providing the error signal to an adaptive algorithm, and
- using output of the adaptive algorithm to update a transfer function of the high-pass filter.
8 more elements
A method performed by active noise reduction (ANR) headphones comprising:
- adaptively adjusting a gain applied to an audio signal to provide a gain adjusted audio signal;
- providing the audio signal and the gain adjusted audio signal to an audio limiter;
- and
- limiting the audio signal based on the gain adjusted audio signal to provide an adjusted audio signal,
- wherein adaptively adjusting the gain applied to the audio signal comprises adjusting the gain based on an output received from a leak detector, and
- wherein the leak detector comprises a high-pass filter and an adaptive algorithm configured to update a transfer function of the high-pass filter, and wherein the output of the leak detector corresponds to a center frequency value of the high-pass filter.
3 more elements
Dependencies are inferred from the claim text.