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1. (WO2019027533) ACOUSTIC NOISE REDUCTION AUDIO SYSTEM HAVING TAP CONTROL
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CLAIMS

What is claimed is:

1. A method for controlling an audio system, the method comprising:

tapping at least one of an ear or a head of a user one or more times to cause one or more acoustic pressure changes in an ear canal of a user, the ear canal being substantially sealed by a first acoustic noise reduction (ANR) headphone having a first ANR module;

sensing a first supply current provided to the first ANR module, the first supply current being responsive to a pressure change in the ear canal;

determining from the sensed first supply current that a tap event occurred, the tap event having a tap sequence that comprises one or more taps; and

changing at least one of a mode of operation of the audio system and an attribute of an audio input signal in response to the tap sequence of the tap event.

2. The method of claim 1 wherein the sensing of the first supply current comprises sensing at least one of an amplitude of the first supply current, a waveform representing the first supply current and a duration of the first supply current.

3. The method of claim 1 further comprising determining a state of an error condition by sensing a second supply current provided to a second ANR module and determining from the sensed first and second supply currents if the error condition exists.

4. The method of claim 1 further comprising determining a state of an error condition by comparing a power supply voltage relative to a threshold voltage and determining from the comparison if the error condition exists.

5. The method of claim 1 further comprising determining a state of an error condition by sensing a peak voltage of an audio signal, comparing the sensed peak voltage to a threshold voltage and determining from the comparison if the error condition exists.

6. The method of claim 1 wherein tapping comprises at least one of touching, tugging or pulling of skin and/or cartilage of the ear, face or a portion of the head near the first ANR headphone.

7. The method of claim 6, wherein tapping comprises at least one of touching, tugging or pulling of skin and/or cartilage of the tragus of the ear.

8. The method of claim 6, wherein tapping comprises at least one of touching, tugging or pulling of skin and/or cartilage of the helix of the ear.

9. A headphone comprising:

a first microphone for detecting a pressure change in a substantially sealed first cavity of the headphone, the first cavity comprising an ear canal of a wearer of the headphone;

a first acoustic noise reduction (A R) module coupled to the first microphone for generating a noise cancellation signal to cancel noise detected by the first microphone; and

a processor configured to:

detect a user tapping at least one of an ear or a head of the user one or more times to cause one or more acoustic pressure changes in an ear canal of the user;

sense a first supply current provided to the first ANR module, the first supply current being responsive to a pressure change in the ear canal;

determine from the sensed first supply current that a tap event occurred, the tap event having a tap sequence that comprises one or more taps; and

change at least one of a mode of operation of the headphone and an attribute of an audio input signal in response to the tap sequence of the tap event.

10. The headphone of claim 9 wherein the sensing of the first supply current comprises sensing at least one of an amplitude of the first supply current, a waveform representing the first supply current and a duration of the first supply current.

11. The headphone of claim 9 wherein the processor is further configured to determine a state of an error condition by sensing a second supply current provided to a second ANR module and determining from the sensed first and second supply currents if the error condition exists.

12. The headphone of claim 9 wherein the processor is further configured to determine a state of an error condition by comparing a power supply voltage relative to a threshold voltage and determining from the comparison if the error condition exists.

13. The headphone of claim 9 wherein the processor is further configured to determine a state of an error condition by sensing a peak voltage of an audio signal, comparing the sensed peak voltage to a threshold voltage and determining from the comparison if the error

condition exists.

14. The headphone of claim 9 wherein tapping comprises at least one of touching, tugging or pulling of skin and/or cartilage of the ear, face or a portion of the head near the headphone.

15. The headphone of claim 14, wherein tapping comprises at least one of touching, tugging or pulling of skin and/or cartilage of the tragus of the ear.

16. The headphone of claim 14, wherein tapping comprises at least one of touching, tugging, or pulling of skin and/or cartilage of the helix of the ear.