Power-adaptive active noise reduction (ANR) headset
AssigneeBose Corporation
InventorPaul G. Yamkovoy
Life of this patent
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Abstract
Various aspects include active noise reduction (ANR) headsets and methods of controlling such headsets. In some implementations, a headset includes: at least one electro-acoustic transducer; a power source for powering the at least one electro-acoustic transducer; and a control circuit configured to apply active noise reduction (ANR) to environmental sound using the at least one electro-acoustic transducer, sample voltage drops across the power source, and adjust a compressor threshold for the ANR based on the sampled voltage drops across the power source.
Claims25
A headset comprising:
- at least one electro-acoustic transducer configured to provide an audio output;
- a power source for powering the at least one electro-acoustic transducer;
- and
- a control circuit configured to
- apply active noise reduction (ANR) to environmental sound using the at least one electro-acoustic transducer,
- sample voltage drops across the power source, and
- adjust a compressor threshold for the ANR based on the sampled voltage drops across the power source,
- wherein the compressor threshold is adjusted using a compressor threshold loop that includes a voltage detector configured to detect a voltage drop across the power source.
A method of controlling an active noise reduction (ANR) headset, the method comprising:
- applying ANR to environmental sound using the headset,
- sampling voltage drops across a power source for the headset, and
- adjusting a compressor threshold for the ANR based on the sampled voltage drops across the power source,
- wherein the compressor threshold is adjusted using a compressor threshold loop in the ANR headset that includes a voltage detector configured to detect a voltage drop across the power source.
A headset comprising:
- at least one electro-acoustic transducer configured to provide an audio output;
- a power source for powering the at least one electro-acoustic transducer;
- and
- a control circuit configured to
- apply active noise reduction (ANR) to environmental sound using the at least one electro-acoustic transducer,
- sample voltage drops across the power source, and
- adjust a compressor threshold for the ANR based on the sampled voltage drops across the power source,
- wherein the control circuit further includes a sampling circuit including a fixed resistor and a control switch to produce a pre-determined load current from the power source, and
- wherein determining the voltage drop includes determining power source impedance based on comparing the voltage at the power source and the voltage drop across the resistor.
Dependencies are inferred from the claim text.