Active noise cancellation
First Claim
1. A system for providing active noise cancellation (ANC), comprising:
- a digital ANC circuit configured to receive first audio information from a first microphone, to receive an intended audio signal, and to attenuate noise in the intended audio signal using the first audio information and provide a composite audio signal;
an analog ANC circuit configured to receive second audio information from a second microphone, to receive the composite audio signal from the digital ANC circuit, and to attenuate noise in the composite audio signal using the second audio information; and
wherein the system is configured provide an output signal for a speaker using the digital ANC circuit and the analog ANC circuit.
7 Assignments
0 Petitions
Accused Products
Abstract
This document discusses, among other things, systems and methods for active noise cancellation. One example system includes a digital ANC circuit configured to receive first audio information from a first microphone and to produce an a digital anti-noise signal configured to attenuate noise sensed by the first microphone; an analog ANC circuit configured to receive second audio information from a second microphone and to produce an analog anti-noise signal configured to attenuate noise sensed by the second microphone; and wherein the system is configured to receive an intended audio signal and to provide an output signal for a speaker using the intended audio signal, the analog anti-noise signal, and the digital anti-noise signal.
8 Citations
22 Claims
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1. A system for providing active noise cancellation (ANC), comprising:
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a digital ANC circuit configured to receive first audio information from a first microphone, to receive an intended audio signal, and to attenuate noise in the intended audio signal using the first audio information and provide a composite audio signal; an analog ANC circuit configured to receive second audio information from a second microphone, to receive the composite audio signal from the digital ANC circuit, and to attenuate noise in the composite audio signal using the second audio information; and wherein the system is configured provide an output signal for a speaker using the digital ANC circuit and the analog ANC circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for providing active noise cancellation (ANC), comprising:
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receiving first audio information from a first microphone and an intended audio signal attenuating noise in the intended audio signal, and providing a composite audio signal using a digital ANC circuit; receiving second audio information from a second microphone and attenuating noise in the composite audio signal using an analog ANC circuit; and providing and output signal for a speaker using the digital ANC circuit and the analog ANC circuit. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A system for providing active noise cancellation (ANC), comprising:
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a digital ANC circuit configured to receive first audio information from a first microphone and to produce an anti-noise signal configured to attenuate noise sensed by the first audio information, wherein the digital ANC circuit includes; a summation circuit configured to combine the anti-noise signal from the digital ANC circuit with an intended audio signal to form a composite audio signal; and an analog ANC circuit including an amplifier configured to receive second audio information from a second microphone and the composite audio signal, to attenuate noise in the second audio information, and to produce an output signal for a speaker based on the second audio information and the composite audio signal. - View Dependent Claims (21, 22)
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Specification