Wearable audio device with feedback instability control
AssigneeBose Corporation
InventorBenjamin Jason Krosner
Life of this patent
Estimating the term…
Abstract
Aspects include approaches for feedback instability control in wearable audio devices. In certain cases, a method of controlling feedback instability in a wearable audio device with an active noise reduction (ANR) system includes: determining a current feedback instability by combining outputs from multiple instability detectors, applying latch logic to the current feedback instability to determine a current mitigation value, and adjusting a driver command signal based on the current mitigation value to mitigate feedback instability.
Claims20
A method of controlling feedback instability in a wearable audio device with an active noise reduction (ANR) system, the method comprising:
- determining a current feedback instability by combining outputs from multiple instability detectors,
- applying latch logic to the current feedback instability to determine a current mitigation value,
- wherein applying the latch logic comprises:
- applying a baseline mitigation value associated with a baseline instability as the current mitigation value, and
- modifying the current mitigation value in response to determining that the current feedback instability exceeds the baseline instability as controlled by a latch mechanism;
- and
- adjusting a driver command signal based on the current mitigation value to mitigate feedback instability, wherein the baseline mitigation value is a lowest available multiplier that can be applied to the driver command signal.
A wearable audio device comprising:
- an electro-acoustic transducer for providing an audio output,
- at least one microphone configured to detect noise;
- and
- a controller coupled with the electro-acoustic transducer and the at least one microphone, the controller including an active noise reduction (ANR) system for controlling noise in the audio output, wherein the controller is configured to:
- determine a current feedback instability by combining outputs from multiple instability detectors,
- apply latch logic to the current feedback instability to determine a current mitigation value, wherein applying the latch logic comprises:
- applying a baseline mitigation value associated with a baseline instability as the current mitigation value, after detecting the baseline instability value exceeds a nominal instability value associated with a nominal instability mitigation value, and
- modifying the current mitigation value in response to determining that the current feedback instability exceeds the baseline instability as controlled by a latch mechanism, and
- adjust a driver command signal based on the current mitigation value to mitigate feedback instability.
A wearable audio device comprising:
- an electro-acoustic transducer for providing an audio output,
- at least one microphone configured to detect noise;
- and
- a controller coupled with the electro-acoustic transducer and the at least one microphone, the controller including an active noise reduction (ANR) system for controlling noise in the audio output, wherein the controller is configured to:
- determine a current feedback instability by combining outputs from multiple instability detectors,
- apply latch logic to the current feedback instability to determine a current mitigation value,
- feed the current mitigation value into an integrator to control a baseline mitigation value, and
- adjust a driver command signal based on the current mitigation value to mitigate feedback instability.
Dependencies are inferred from the claim text.