Off-head detection of in-ear headset
First Claim
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1. An off-head detection system for a headset, comprising:
- an input device that receives an audio signal, a feed-forward microphone signal, and a driver output signal;
an expected-output computation circuit that predicts a value of the driver output signal based on a combination of the audio signal, the feed-forward microphone signal, and off-head data; and
a comparison circuit that compares the observed output signal provided to the driver and the computed expected output to determine an off-head state of the in-ear headset; and
a user-interface to display an indication of the off-head state of the headset.
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Abstract
An off-head detection system for an in-ear headset comprises an input device that receives an audio signal, a feed-forward microphone signal, and a driver output signal; an expected-output computation circuit that predicts a value of the driver output signal based on a combination of the audio signal and the feed-forward microphone signal from the signal monitoring circuit, and off-head data from the off-head model; and a comparison circuit that compares the observed output signal provided to the driver and the computed expected output to determine an off-head state of the in-ear headset.
43 Citations
25 Claims
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1. An off-head detection system for a headset, comprising:
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an input device that receives an audio signal, a feed-forward microphone signal, and a driver output signal; an expected-output computation circuit that predicts a value of the driver output signal based on a combination of the audio signal, the feed-forward microphone signal, and off-head data; and a comparison circuit that compares the observed output signal provided to the driver and the computed expected output to determine an off-head state of the in-ear headset; and a user-interface to display an indication of the off-head state of the headset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An off-head detection system for a headset, comprising:
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an input for receiving an audio input signal to be reproduced by an electro-acoustic transducer of the headset; a feed-forward microphone configured to generate a first input signal indicative of an external environment of the headset; a feed-forward compensator configured to apply filters to the first input signal to generate a feed-forward signal; a processor configured to; generate an output signal for the electro-acoustic transducer based on the audio input signal and the feed-forward signal; determine an estimated output signal for the electro-acoustic transducer based on the audio input signal, the feed-forward signal, a model of the driver-to-feedback-microphone transfer function in the off-head state, and measurements of off-head acoustic transfer functions associated with the headset; compare the output signal to the estimated output signal; and determine whether the comparison indicates that the headset is off or on a wearer'"'"'s head based on the comparison. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An off-head detection system for a headset, comprising:
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an input for receiving an audio input signal to be reproduced by an electro-acoustic transducer of the headset; a feed-forward microphone configured to generate a first input signal indicative of an external environment of the headset; a feed-forward compensator configured to apply filters to the first input signal to generate a feed-forward signal having a gain; a processor configured to; detect whether the headset is off or on a wearer'"'"'s head; in response to an off-head state being detected, the off-head state comprising the headset being removed from the wearer'"'"'s head, automatically reducing the gain applied by the feed-forward compensator to the first input signal to generated a reduced-gain feed-forward signal; and generate an output signal for the electro-acoustic transducer based on the audio input signal and the reduced-gain feed-forward signal, wherein the processor is further configured to; automatically reduce the gain applied by the feed-forward compensator to the first input signal by limiting a maximum gain in frequency bands where oscillation tends to occur. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification