Providing Audio and Ambient Sound simultaneously in ANR Headphones
First Claim
1. An active noise reducing headphone comprising:
- an ear piece configured to couple to a wearer'"'"'s ear to define an acoustic volume comprising the volume of air within the wearer'"'"'s ear canal and a volume within the ear piece;
a feed-forward microphone acoustically coupled to an external environment and electrically coupled to a feed-forward active noise cancellation signal path;
a feedback microphone acoustically coupled to the acoustic volume and electrically coupled to a feedback active noise cancellation signal path;
a signal input for receiving an input electronic audio signal and electrically coupled to an audio playback signal path;
an output transducer acoustically coupled to the acoustic volume via the volume within the ear piece and electrically coupled to the feed-forward and feedback active noise cancellation signal paths and the audio playback signal path; and
a signal processor configured to apply filters and control gains of both the feed-forward and feedback active noise cancellation signal paths;
wherein 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;
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; and
provide the input electronic audio signal to the output transducer via the audio playback signal path during both the first and second operating modes.
1 Assignment
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Accused Products
Abstract
In an active noise reducing headphone, a signal processor applies filters and control gains of 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, 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, and provide an input electronic audio signal to an output transducer via an audio playback signal path during both the first and second operating modes.
46 Citations
17 Claims
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1. An active noise reducing headphone comprising:
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an ear piece configured to couple to a wearer'"'"'s ear to define an acoustic volume comprising the volume of air within the wearer'"'"'s ear canal and a volume within the ear piece; a feed-forward microphone acoustically coupled to an external environment and electrically coupled to a feed-forward active noise cancellation signal path; a feedback microphone acoustically coupled to the acoustic volume and electrically coupled to a feedback active noise cancellation signal path; a signal input for receiving an input electronic audio signal and electrically coupled to an audio playback signal path; an output transducer acoustically coupled to the acoustic volume via the volume within the ear piece and electrically coupled to the feed-forward and feedback active noise cancellation signal paths and the audio playback signal path; and a signal processor configured to apply filters and control gains of both the feed-forward and feedback active noise cancellation signal paths; wherein 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; 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; and provide the input electronic audio signal to the output transducer via the audio playback signal path during both the first and second operating modes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of operating an active noise reducing headphone comprising
an ear piece configured to couple to a wearer'"'"'s ear to define an acoustic volume comprising the volume of air within the wearer'"'"'s ear canal and a volume within the ear piece; -
a feed-forward microphone acoustically coupled to an external environment and electrically coupled to a feed-forward active noise cancellation signal path; a feedback microphone acoustically coupled to the acoustic volume and electrically coupled to a feedback active noise cancellation signal path; a signal input for receiving an input electronic audio signal and electrically coupled to an audio playback signal path; an output transducer acoustically coupled to the acoustic volume via the volume within the ear piece and electrically coupled to the feed-forward and feedback active noise cancellation signal paths and the audio playback signal path; and a signal processor configured to apply filters and control gains of both the feed-forward and feedback active noise cancellation signal paths; the method comprising, in the signal processor; applying first feed-forward filters to the feed-forward signal path and applying first feedback filters to the feedback signal path during a first operating mode to provide effective cancellation of ambient sound; applying second feed-forward filters to the feed-forward signal path during a second operating mode to provide active hear-through of ambient sounds with ambient naturalness; and providing the input electronic audio signal to the output transducer via the audio playback signal path during both the first and second operating modes.
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Specification