Systems and methods for multi-mode adaptive noise cancellation for audio headsets
First Claim
1. An integrated circuit for implementing at least a portion of a personal audio device, comprising:
- an output for providing an output signal to a transducer including both a source audio signal for playback to a listener and an anti-noise signal for countering the effect of ambient audio sounds in an acoustic output of the transducer; and
a processing circuit that implements an adaptive noise cancellation system that generates the anti-noise signal to reduce the presence of the ambient audio sounds heard by the listener by adapting, based on a presence of the source audio signal, a response of the adaptive noise cancellation system to minimize the ambient audio sounds at the acoustic output of the transducer, wherein;
the adaptive noise cancellation system is configured to adapt both in the presence and the absence of the source audio signal; and
the processing circuit selectively enables and disables adaptation of the response of the adaptive noise cancellation system in the presence of the source audio signal based on at least one of a persistence of the source audio signal and a spectral density of the source audio signal, wherein a persistence of the source audio signal is a measure of a portion of a time interval in which the source audio signal is substantially non-zero.
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Accused Products
Abstract
In accordance with the present disclosure, an integrated circuit for implementing at least a portion of a personal audio device may include an output and a processing circuit. The output may provide an output signal to a transducer including both a source audio signal for playback to a listener and an anti-noise signal for countering the effect of ambient audio sounds in an acoustic output of the transducer. The processing circuit may implement an adaptive noise cancellation system that generates the anti-noise signal to reduce the presence of the ambient audio sounds heard by the listener by adapting, based on a presence of the source audio signal, a response of the adaptive noise cancellation system to minimize the ambient audio sounds at the acoustic output of the transducer, wherein the adaptive noise cancellation system is configured to adapt both in the presence and the absence of the source audio signal.
296 Citations
63 Claims
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1. An integrated circuit for implementing at least a portion of a personal audio device, comprising:
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an output for providing an output signal to a transducer including both a source audio signal for playback to a listener and an anti-noise signal for countering the effect of ambient audio sounds in an acoustic output of the transducer; and a processing circuit that implements an adaptive noise cancellation system that generates the anti-noise signal to reduce the presence of the ambient audio sounds heard by the listener by adapting, based on a presence of the source audio signal, a response of the adaptive noise cancellation system to minimize the ambient audio sounds at the acoustic output of the transducer, wherein; the adaptive noise cancellation system is configured to adapt both in the presence and the absence of the source audio signal; and the processing circuit selectively enables and disables adaptation of the response of the adaptive noise cancellation system in the presence of the source audio signal based on at least one of a persistence of the source audio signal and a spectral density of the source audio signal, wherein a persistence of the source audio signal is a measure of a portion of a time interval in which the source audio signal is substantially non-zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for canceling ambient audio sounds in the proximity of a transducer of a personal audio device, the method comprising:
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generating a source audio signal for playback to a listener; adaptively generating an anti-noise signal to reduce the presence of the ambient audio sounds heard by the listener by adapting, based on a presence of the source audio signal, a response of an adaptive noise cancellation system to minimize the ambient audio sounds at an acoustic output of the transducer, wherein; the adaptive noise cancellation system is configured to adapt both in the presence and the absence of the source audio signal; and selectively enabling and disabling adaptation of the response of the adaptive noise cancellation system in the presence of the source audio signal based on at least one of a persistence of the source audio signal and a spectral density of the source audio signal, wherein a persistence of the source audio signal is a measure of a portion of a time interval in which the source audio signal is substantially non-zero; and combining the anti-noise signal with a source audio signal to generate an audio signal provided to the transducer. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A personal audio device comprising:
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a transducer for reproducing an audio signal including both a source audio signal for playback to a listener and an anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the transducer; and a processing circuit that implements an adaptive noise cancellation system that generates the anti-noise signal to reduce the presence of the ambient audio sounds heard by the listener by adapting, based on a presence of the source audio signal, a response of the adaptive noise cancellation system to minimize the ambient audio sounds at the acoustic output of the transducer, wherein; the adaptive noise cancellation system is configured to adapt both in the presence and the absence of the source audio signal; and the processing circuit selectively enables and disables adaptation of the response of the adaptive noise cancellation system in the presence of the source audio signal based on at least one of a persistence of the source audio signal and a spectral density of the source audio signal, wherein a persistence of the source audio signal is a measure of a portion of a time interval in which the source audio signal is substantially non-zero. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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Specification