Coordinated gain control in adaptive noise cancellation (ANC) for earspeakers
First Claim
1. A personal audio system, comprising:
- a first earspeaker for reproducing a first audio signal including both first source audio for playback to a listener and a first anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the first earspeaker;
a second earspeaker for reproducing a second audio signal including both second source audio for playback to a listener and a second anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the second earspeaker;
at least one microphone for providing at least one microphone signal indicative of the ambient audio sounds; and
a processing circuit that generates the first anti-noise signal from the at least one microphone signal using a first adaptive filter to reduce the presence of the ambient audio sounds at the first earspeaker in conformity with the at least one microphone signal, wherein the processing circuit generates the second anti-noise signal from the at least one microphone signal using a second adaptive filter to reduce the presence of the ambient audio sounds at the second earspeaker in conformity with the at least one microphone signal, wherein the processing circuit determines a first degree of coupling between the first earspeaker and an ear of the listener and determines a second degree of coupling between the second earspeaker and another ear of the listener, and wherein the processing circuit reduces a gain of both the first adaptive filter and the second adaptive filter in response to detecting that the first degree of coupling indicates that the first earspeaker is loosely coupled to the ear of the listener or that the second degree of coupling indicates that the second earspeaker is loosely coupled to the other ear of the listener.
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Abstract
A personal audio device including earspeakers, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal for each earspeaker from at least one microphone signal that measures the ambient audio, and the anti-noise signals are combined with source audio to provide outputs for the earspeakers. The anti-noise signals cause cancellation of ambient audio sounds at the respective earspeakers. A processing circuit uses the microphone signal(s) to generate the anti-noise signals, which can be generated by adaptive filters. The processing circuit controls adaptation of the adaptive filters such that when the processing circuit detects that either of the earspeakers are off-ear, a gain applied to the anti-noise signals is reduced.
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Citations
27 Claims
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1. A personal audio system, comprising:
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a first earspeaker for reproducing a first audio signal including both first source audio for playback to a listener and a first anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the first earspeaker; a second earspeaker for reproducing a second audio signal including both second source audio for playback to a listener and a second anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the second earspeaker; at least one microphone for providing at least one microphone signal indicative of the ambient audio sounds; and a processing circuit that generates the first anti-noise signal from the at least one microphone signal using a first adaptive filter to reduce the presence of the ambient audio sounds at the first earspeaker in conformity with the at least one microphone signal, wherein the processing circuit generates the second anti-noise signal from the at least one microphone signal using a second adaptive filter to reduce the presence of the ambient audio sounds at the second earspeaker in conformity with the at least one microphone signal, wherein the processing circuit determines a first degree of coupling between the first earspeaker and an ear of the listener and determines a second degree of coupling between the second earspeaker and another ear of the listener, and wherein the processing circuit reduces a gain of both the first adaptive filter and the second adaptive filter in response to detecting that the first degree of coupling indicates that the first earspeaker is loosely coupled to the ear of the listener or that the second degree of coupling indicates that the second earspeaker is loosely coupled to the other ear of the listener. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of countering effects of ambient audio sounds by a personal audio system, the method comprising:
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first generating a first anti-noise signal from at least one microphone signal using a first adaptive filter to reduce the presence of the ambient audio sounds at a first earspeaker in conformity with the at least one microphone signal; second generating a second anti-noise signal from the at least one microphone signal using a second adaptive filter to reduce the presence of the ambient audio sounds at a second earspeaker in conformity with the at least one microphone signal; determining a first degree of coupling between the first earspeaker and an ear of the listener; determining a second degree of coupling between the second earspeaker and another ear of the listener; and responsive to detecting that the first degree of coupling indicates that the first earspeaker is loosely coupled to the ear of the listener or that the second degree of coupling indicates that the second earspeaker is loosely coupled to the other ear of the listener, reducing a gain of both the first adaptive filter and the second adaptive filter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An integrated circuit for implementing at least a portion of a personal audio system, comprising:
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a first output for providing a first output signal to a first earspeaker including both first source audio for playback to a listener and a first anti-noise signal for countering the effects of ambient audio sounds in a first acoustic output of the first earspeaker; a second output for providing a second output signal to a second earspeaker including both second source audio for playback to a listener and a second anti-noise signal for countering the effects of the ambient audio sounds in a second acoustic output of the second earspeaker; at least one microphone input for receiving at least one microphone signal indicative of the ambient audio sounds; and a processing circuit that generates the first anti-noise signal from the at least one microphone signal using a first adaptive filter to reduce the presence of the ambient audio sounds at the first earspeaker in conformity with the at least one microphone signal, wherein the processing circuit generates the second anti-noise signal from the at least one microphone signal using a second adaptive filter to reduce the presence of the ambient audio sounds at the second earspeaker in conformity with the at least one microphone signal, wherein the processing circuit determines a first degree of coupling between the first earspeaker and an ear of the listener and determines a second degree of coupling between the second earspeaker and another ear of the listener, and wherein the processing circuit reduces a gain of both the first adaptive filter and the second adaptive filter in response to detecting that the first degree of coupling indicates that the first earspeaker is loosely coupled to the ear of the listener or that the second degree of coupling indicates that the second earspeaker is loosely coupled to the other ear of the listener. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification