Headphone off-ear detection
First Claim
1. A signal processor circuit assembly for off-ear headphone detection comprising:
- an audio generator configured to generate a tone signal at a specified frequency bin, the tone signal included in an audio signal transmitted toward a headphone speaker;
a feedback microphone input to receive a feedback signal from a feedback microphone in a headphone, the feedback signal based in part on the audio signal including the tone signal; and
an off ear detection processor configured to determine a received frequency response from the feedback signal, determine a difference metric between the received frequency response and a modeled off-ear frequency response, and use the difference metric to detect when the headphone is in an off-ear state.
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Abstract
Disclosed is a signal processor for headphone off-ear detection. The signal processor includes an audio output to transmit an audio signal toward a headphone speaker in a headphone cup. The signal processor also includes a feedback (FB) microphone input to receive a FB signal from a FB microphone in the headphone cup. The signal processor also includes an off-ear detection (OED) signal processor to determine an audio frequency response of the FB signal over an OED frame as a received frequency response. The OED processor also determines an audio frequency response of the audio signal times an off-ear transfer function between the headphone speaker and the FB microphone as an ideal off-ear response. A difference metric si generated comparing the received frequency response to the ideal off-ear frequency response. The difference metric is employed to detect when the headphone cup is disengaged from an ear.
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Citations
20 Claims
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1. A signal processor circuit assembly for off-ear headphone detection comprising:
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an audio generator configured to generate a tone signal at a specified frequency bin, the tone signal included in an audio signal transmitted toward a headphone speaker; a feedback microphone input to receive a feedback signal from a feedback microphone in a headphone, the feedback signal based in part on the audio signal including the tone signal; and an off ear detection processor configured to determine a received frequency response from the feedback signal, determine a difference metric between the received frequency response and a modeled off-ear frequency response, and use the difference metric to detect when the headphone is in an off-ear state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of headphone off-ear detection comprising:
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generating a tone signal at a specified frequency; including the generated tone signal in an audio signal transmitted toward a headphone speaker; receiving a feedback signal from a feedback microphone in a headphone, the feedback signal based in part on the audio signal; determining a received frequency response from the feedback signal; determining a difference metric between the received frequency response and a modeled off-ear frequency response, the difference metric based in part on the tone signal; and detecting when the headphone is in an off-ear state using the difference metric. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A headphone system comprising:
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a speaker; an audio generator configured to generate a tone signal at a specified frequency bin, the tone signal included in an audio signal transmitted to the speaker; a feedback microphone positioned in the headphone, the feedback microphone configured to generate a feedback signal based in part on the audio signal; an off ear detection processor coupled to the feedback microphone, the off ear detection processor configured to determine a received frequency response from the feedback signal, determine a difference metric between the received frequency response and a modeled off-ear frequency response, and use the difference metric to detect when the headphone is in an off-ear state. - View Dependent Claims (17, 18, 19, 20)
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Specification