Providing Ambient Naturalness in ANR Headphones
First Claim
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1. A computer-implemented method comprising:
- receiving a first external audio signal from a microphone of a noise-reducing device;
generating a noise-cancellation signal for cancelling the first external audio signal;
causing a speaker of the noise-reducing device to generate audio corresponding to the noise-cancellation signal in an active noise reduction (ANR) mode;
receiving a second external audio signal from the microphone of the noise-reducing device;
determining that at least a first portion of the second external audio signal indicates that the noise-reducing device should transition from the ANR mode to a hear-through mode;
transitioning to the hear-through mode, the transitioning comprises facilitating presentation of at least a second portion of the second external audio signal at the noise-reducing device by modifying noise cancellation for at least the second portion of the second external audio signal.
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Abstract
In an active noise reducing headphone, a signal processor applies filters and control gains of both the feed-forward and feedback active noise cancellation signal paths. The signal processor is configured to apply first feed-forward filters to the feed-forward signal path and apply first feedback filters to the feedback signal path during a first operating mode providing effective cancellation of ambient sound, and to apply second feed-forward filters to the feed-forward signal path during a second operating mode providing active hear-through of ambient sounds with ambient naturalness.
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Citations
29 Claims
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1. A computer-implemented method comprising:
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receiving a first external audio signal from a microphone of a noise-reducing device; generating a noise-cancellation signal for cancelling the first external audio signal; causing a speaker of the noise-reducing device to generate audio corresponding to the noise-cancellation signal in an active noise reduction (ANR) mode; receiving a second external audio signal from the microphone of the noise-reducing device; determining that at least a first portion of the second external audio signal indicates that the noise-reducing device should transition from the ANR mode to a hear-through mode; transitioning to the hear-through mode, the transitioning comprises facilitating presentation of at least a second portion of the second external audio signal at the noise-reducing device by modifying noise cancellation for at least the second portion of the second external audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A noise-reducing device comprising:
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an ear piece configured to couple to a wearer'"'"'s ear, the ear piece providing passive attenuation of ambient sound into the wearer'"'"'s ear; a first microphone acoustically coupled to an external environment and electrically coupled to a first active noise cancellation signal path having a first filter with configurable coefficients; an output transducer acoustically coupled to the wearer'"'"'s ear canal when the ear piece is coupled to the wearer'"'"'s ear and electrically coupled to the first active noise cancellation signal path; and a signal processor configured to apply the coefficients of the first filter, wherein; in an active noise reduction (ANR) mode, the first microphone is configured to receive a first external audio signal, the first active noise cancellation signal path is configured to generate a noise cancellation signal for cancelling the first external audio signal, and the output transducer is configured to generate audio corresponding to the noise cancellation signal; the first microphone is configured to receive a second external audio signal; and the signal processor is configured to; determine that at least a first portion of the second external audio signal indicates that the noise-reducing device should transition from the ANR mode to a hear-through mode; and transition the noise-reducing device to the hear-through mode, the transition comprises facilitating presentation of at least a second portion of the second external audio signal at the noise-reducing device by modifying noise cancellation for at least the second portion of the second external audio signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An active noise reducing headphone comprising:
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an audio input unit configured to receive an external audio signal; a noise cancellation unit configured to perform noise cancellation using a first portion of the external audio signal in an active noise reducing (ANR) mode; and a processor configured to; determine that a second portion of the external audio signal indicates that the active noise reducing headphone should transition from the ANR mode to an active hear-through mode; transition the active noise reducing headphone to the active hear-through mode, the transition comprising facilitating presentation of at least a third portion of the external audio signal at the active noise reducing headphone by modifying noise cancellation for at least the third portion of the external audio signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification