Audio signal processing for noise reduction
First Claim
1. A headphone system, comprising:
- a plurality of left microphones coupled to a left earpiece to provide a plurality of left signals;
a plurality of right microphones coupled to a right earpiece to provide a plurality of right signals;
one or more processors configured to;
combine one or more of the plurality of left signals or the plurality of right signals to provide a primary signal having enhanced acoustic response in a direction of a selected location,combine the plurality of left signals to provide a left reference signal having reduced acoustic response from the selected location, andcombine the plurality of right signals to provide a right reference signal having reduced acoustic response from the selected location;
a left filter configured to filter the left reference signal to provide a left estimated noise signal;
a right filter configured to filter the right reference signal to provide a right estimated noise signal; and
a combiner configured to subtract the left estimated noise signal and the right estimated noise signal from the primary signal.
1 Assignment
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Accused Products
Abstract
Audio device systems and methods are provided to enhance speech pick-up from a user. The systems and methods include a plurality of left signals and right signals from microphones coupled to left and right earpieces. Various of the signals are combined to provide a primary signal having enhanced acoustic response in the direction of a selected location, such as the user'"'"'s mouth. Additionally, the left signals are combined to provide a left reference signal having reduced acoustic response from the selected location, and the right signals are combined to provide a right reference signal also having reduced acoustic response from the selected location. Each of the left and right reference signals are filtered to provide left and right noise estimates, respectively, and the left and right noise estimates are subtracted from the primary signal.
66 Citations
20 Claims
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1. A headphone system, comprising:
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a plurality of left microphones coupled to a left earpiece to provide a plurality of left signals; a plurality of right microphones coupled to a right earpiece to provide a plurality of right signals; one or more processors configured to; combine one or more of the plurality of left signals or the plurality of right signals to provide a primary signal having enhanced acoustic response in a direction of a selected location, combine the plurality of left signals to provide a left reference signal having reduced acoustic response from the selected location, and combine the plurality of right signals to provide a right reference signal having reduced acoustic response from the selected location; a left filter configured to filter the left reference signal to provide a left estimated noise signal; a right filter configured to filter the right reference signal to provide a right estimated noise signal; and a combiner configured to subtract the left estimated noise signal and the right estimated noise signal from the primary signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of enhancing speech of a headphone user, the method comprising:
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receiving a plurality of left microphone signals; receiving a plurality of right microphone signals; combining one or more of the plurality of left and right microphone signals to provide a primary signal having enhanced acoustic response in a direction of a selected location; combining the plurality of left microphone signals to provide a left reference signal having reduced acoustic response from the selected location; combining the plurality of right microphone signals to provide a right reference signal having reduced acoustic response from the selected location; filtering the left reference signal to provide a left estimated noise signal; filtering the right reference signal to provide a right estimated noise signal; and subtracting the left estimated noise signal and the right estimated noise signal from the primary signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A headphone system, comprising:
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a plurality of left microphones to provide a plurality of left signals; a plurality of right microphones to provide a plurality of right signals; one or more processors configured to; combine the plurality of left signals to provide a left primary signal having enhanced acoustic response in a direction of a user'"'"'s mouth, combine the plurality of right signals to provide a right primary signal having enhanced acoustic response in the direction of the user'"'"'s mouth, combine the left primary signal and the right primary signal to provide a voice estimate signal, combine the plurality of left signals to provide a left reference signal having reduced acoustic response in the direction of the user'"'"'s mouth, and combine the plurality of right signals to provide a right reference signal having reduced acoustic response in the direction of the user'"'"'s mouth; a left filter configured to filter the left reference signal to provide a left estimated noise signal; a right filter configured to filter the right reference signal to provide a right estimated noise signal; and a combiner configured to subtract the left estimated noise signal and the right estimated noise signal from the voice estimate signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification