COORDINATED CONTROL OF ADAPTIVE NOISE CANCELLATION (ANC) AMONG EARSPEAKER CHANNELS
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, and wherein the processing circuit manages adaptation of the first adaptive filter and the second adaptive filter such that action is further taken on adaptation of the second adaptive filter in response to detecting an event requiring action on adaptation of the first adaptive filter.
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Accused Products
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 an event requiring action on the adaptation of one of the adaptive filters is detected, action is taken on the other one of the adaptive filters. Another feature of the ANC system uses microphone signals provided at both of the earspeakers to perform processing on a voice microphone signal that receives speech of the user.
83 Citations
36 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, and wherein the processing circuit manages adaptation of the first adaptive filter and the second adaptive filter such that action is further taken on adaptation of the second adaptive filter in response to detecting an event requiring action on adaptation of the first adaptive filter. - 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; and responsive to detecting an event requiring action on adaptation of the first adaptive filter, taking action on adaptation of 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, and wherein the processing circuit manages adaptation of the first adaptive filter and the second adaptive filter such that action is further taken on adaptation of the second adaptive filter in response to detecting an event requiring action on adaptation of the first adaptive filter. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. 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, wherein the first earspeaker includes a first microphone mounted on a housing of the first earspeaker for generating a first microphone signal; 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, wherein the second earspeaker includes a second microphone mounted on a housing of the second earspeaker for generating a second microphone signal; a voice microphone for generating a voice microphone signal indicative of a voice of the listener; and a processing circuit that generates the first anti-noise signal from the first microphone signal using a first adaptive filter to reduce the presence of the ambient audio sounds at the first earspeaker in conformity with the first microphone signal, wherein the processing circuit generates the second anti-noise signal from the second microphone signal using a second adaptive filter to reduce the presence of the ambient audio sounds at the second earspeaker in conformity with the second microphone signal, and wherein the processing circuit further uses the first microphone signal and the second microphone signal to perform further processing with respect to the voice microphone signal. - View Dependent Claims (29, 30)
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31. 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; measuring near speech with a near speech microphone that generates a voice microphone signal; and using the first microphone signal and the second microphone signal to perform further processing with respect to the voice microphone signal. - View Dependent Claims (32, 33)
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34. An integrated circuit for implementing at least a portion of a personal audio system, comprising:
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an 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 an acoustic output of the first earspeaker, wherein the first earspeaker includes a first microphone mounted on a housing of the first earspeaker for generating a first microphone signal; an 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 ambient audio sounds in an acoustic output of the second earspeaker, wherein the second earspeaker includes a second microphone mounted on a housing of the second earspeaker for generating a second microphone signal; a voice microphone input for receiving a voice microphone signal indicative of a voice of the listener; and a processing circuit that adaptively generates the first anti-noise signal from the first microphone signal using a first adaptive filter to reduce the presence of the ambient audio sounds at the first earspeaker in conformity with the first microphone signal, wherein the processing circuit generates the second anti-noise signal from the second microphone signal using a second adaptive filter to reduce the presence of the ambient audio sounds at the second earspeaker in conformity with the second microphone signal, and wherein the processing circuit further uses the first microphone signal and the second microphone signal to perform further processing with respect to the voice microphone signal. - View Dependent Claims (35, 36)
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Specification