Liquid detection for an acoustic module
First Claim
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1. An electronic device, comprising:
- a housing;
an acoustic passage internal to the housing;
an acoustic transducer coupled to the acoustic passage; and
circuitry electrically coupled to the acoustic transducer and operable to;
measure an impedance of the acoustic transducer at approximately a reference frequency of the acoustic transducer; and
detect a presence of liquid based on the measured impedance;
wherein;
the reference frequency corresponds to a resonant frequency of the acoustic transducer in an unobstructed condition; and
the presence of liquid is detected based on a reduction of impedance over a range of frequencies that includes the resonant frequency as compared to a reference value.
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Abstract
An acoustic module is coupled to an acoustic passage. The acoustic module includes an acoustic transducer coupled to a diaphragm. A controller or other circuitry measures an impedance of the acoustic transducer. Based on the impedance, the controller determines whether the impedance indicates that the acoustic passage is blocked. The controller may determine that the acoustic passage is blocked by liquid that is present in the acoustic passage. When the controller determines based on the impedance that liquid is present in the acoustic passage, the controller may drive out, purge, and/or otherwise remove the liquid, such as by using the acoustic transducer to vibrate the diaphragm.
100 Citations
20 Claims
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1. An electronic device, comprising:
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a housing; an acoustic passage internal to the housing; an acoustic transducer coupled to the acoustic passage; and circuitry electrically coupled to the acoustic transducer and operable to; measure an impedance of the acoustic transducer at approximately a reference frequency of the acoustic transducer; and detect a presence of liquid based on the measured impedance;
wherein;the reference frequency corresponds to a resonant frequency of the acoustic transducer in an unobstructed condition; and the presence of liquid is detected based on a reduction of impedance over a range of frequencies that includes the resonant frequency as compared to a reference value. - View Dependent Claims (2, 3)
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4. An electronic device, comprising:
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a housing; an acoustic passage internal to the housing; an acoustic transducer coupled to the acoustic passage; and circuitry electrically coupled to the acoustic transducer and operable to; measure an impedance of the acoustic transducer at approximately a reference frequency of the acoustic transducer; detect a presence of liquid based on the measured impedance; and apply a drive signal to a transducer, the drive signal is configured to purge the liquid from the acoustic passage. - View Dependent Claims (5, 6, 7)
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8. An electronic device, comprising:
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a housing; a port defined in the housing; an acoustic module coupled to the port, the acoustic module including an acoustic transducer; and a controller coupled to the acoustic module and operable to; measure an impedance of the acoustic transducer at approximately a resonant frequency of the acoustic transducer; determine a blockage condition based on the measured impedance; and distinguish if the blockage condition is due to a blockage of the port or a foreign material within the housing. - View Dependent Claims (9, 10, 11)
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12. An electronic device, comprising:
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a housing; a port defined in the housing; an acoustic module coupled to the port, the acoustic module including an acoustic transducer; a microphone; and a controller coupled to the acoustic module and the microphone, the controller operable to; measure an impedance of the acoustic transducer at approximately a resonant frequency of the acoustic transducer; determine a blockage condition based on the measured impedance; measure an ambient acoustic level; and in response to the measured ambient acoustic level exceeding a threshold, drive the acoustic transducer at the resonant frequency and measure the impedance of the acoustic transducer. - View Dependent Claims (13, 14, 15)
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16. An electronic device, comprising:
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an enclosure; an acoustic module including an acoustic transducer, the acoustic module coupled to a passage within an interior of the enclosure; a detector coupled to the acoustic transducer operable to measure a change in impedance of the acoustic transducer; and a processing unit coupled to the detector operable to determine a blockage condition based on the change in impedance;
wherein the processing unit uses the impedance to determine at least one of an amount of a contaminant or a type of a contaminant. - View Dependent Claims (17, 18, 19, 20)
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Specification