Pressure-responsive sensors and related systems and methods
An audio appliance includes a microphone transducer having an acoustically sensitive region to convert incident acoustic energy to a corresponding output signal and a barometric transducer having a pressure-responsive region to convert an ambient pressure to a corresponding output signal. The audio appliance also has an acoustic housing defining a chamber to fluidly couple the microphone transducer with the barometric transducer, together with a processor and a memory containing instructions. The instructions, when executed by the processor, cause the audio appliance to determine a presence or an absence of an ambient impairment to the microphone transducer based at least in part on the output signal from the barometric transducer. Responsive to a determined presence of an ambient impairment to the microphone transducer, the instructions, when executed by the processor, cause the audio appliance to mitigate effects of the ambient impairment.
1. An audio appliance, comprising:
a microphone transducer having an acoustically sensitive region to convert incident acoustic energy to a corresponding output signal;
a barometric transducer having a pressure-responsive region to convert an ambient pressure to a corresponding output signal;
an acoustic housing defining a chamber to fluidly couple the microphone transducer with the barometric transducer;
a processor; and
a memory containing instructions that, when executed by the processor, cause the audio appliance
to determine a presence of an ambient impairment to the microphone transducer based at least in part on the output signal from the barometric transducer, and
responsive to the determined presence of the ambient impairment to the microphone transducer, to estimate an acoustic signal corresponding to the ambient impairment and to subtract the estimated acoustic signal from the output signal from the microphone transducer.
2. The audio appliance according to claim 1 , wherein the instructions that, when executed by the processor, cause the audio appliance to determine the presence of the ambient impairment to the microphone transducer comprise instructions that, when executed by the processor, cause the audio appliance to determine the presence of the ambient impairment based on a comparison of the output signal from the barometric transducer with a threshold signal.
3. The audio appliance according to claim 2 , wherein the threshold signal comprises the output signal from the microphone transducer.
4. The audio appliance according to claim 1 , wherein the instructions that, when executed by the processor, cause the audio appliance to estimate the acoustic signal corresponding to the ambient impairment comprise instructions that, when executed by the processor, cause the audio appliance to estimate the acoustic signal based at least on the output signal from the barometric transducer.
5. The audio appliance according to claim 1 , wherein the microphone transducer comprises a first microphone transducer, the audio appliance further comprising a second microphone transducer, wherein the instructions that, when executed by the processor, cause the audio appliance to mitigate effects of the ambient impairment comprise instructions that, when executed by the processor, cause the audio appliance to receive output from the second microphone transducer and to ignore output from the first microphone transducer.
6. The audio appliance according to claim 2 , wherein the instructions that, when executed by the processor, cause the audio application to mitigate effects of the ambient impairment responsive to the determined presence of the ambient impairment to the microphone transducer, comprise further instructions that, when executed by the processor, cause the audio appliance to communicate an output from the barometric pressure transducer to an ambient-impairment processing unit.
7. The audio appliance according to claim 2 , wherein the instructions that, when executed by the processor, cause the audio application to mitigate effects of the ambient impairment responsive to the determined presence of the ambient impairment to the microphone transducer, comprise further instructions that, when executed by the processor, cause the audio appliance to interrupt the output signal from the microphone transducer.
8. A pressure-responsive device, comprising:
an enclosure defining an acoustic chamber, wherein the enclosure further defines a port opening to the acoustic chamber and acoustically coupling the acoustic chamber with an external environment;
a first pressure-responsive region exposed to the acoustic chamber and responsive to a first range of pressure conditions;
a second pressure-responsive region exposed to the acoustic chamber and responsive to a second range of pressure conditions;
output circuitry configured to output a first signal corresponding to a response of the first pressure-responsive region to a pressure condition in the acoustic chamber, wherein the output circuitry is further configured to output a second signal responsive to the pressure condition in the acoustic chamber being outside the first range of pressure conditions.
9. The pressure-responsive device according to claim 8 , wherein the output circuitry is further configured to interrupt the output of the first signal responsive to the pressure condition in the acoustic chamber being outside the first range of pressure conditions.
10. The pressure-responsive device according to claim 8 , wherein the second signal corresponds to a response of the second pressure-responsive region to the pressure condition in the acoustic chamber.
11. The pressure-responsive device according to claim 8 , further comprising compensation circuitry configured to modify the first signal in correspondence with a response of the second pressure-responsive region to the pressure condition in the acoustic chamber.
12. The pressure-responsive device according to claim 8 , wherein the output circuitry is further configured to interrupt the output of the second signal responsive to the pressure condition in the acoustic chamber being within the first range of pressure conditions.
13. The pressure-responsive device according to claim 8 , wherein the second signal comprises a modified version of the first signal.
14. The pressure-responsive device according to claim 8 , wherein the first range of pressure conditions comprises frequencies up to about 40 kHz and amplitudes between about 25 milli-Pascal (mPa) and about 100 Pascal (Pa) above a reference pressure.
15. The pressure-responsive device according to claim 8 , wherein the first pressure-responsive region is responsive to the first range of pressure conditions without clipping.
16. The pressure-responsive device according to claim 8 , the second pressure-responsive region is responsive to the second range of pressure conditions without clipping.
17. The pressure-responsive device according to claim 16 , wherein the second range of pressure conditions comprises a pressure greater than about 100 Pascal (Pa) above a reference pressure.
18. The pressure-responsive device according to claim 8 , further comprising compensation circuitry configured to modify the first signal responsive to the pressure condition in the acoustic chamber being outside the first range of pressure conditions.
19. The pressure-responsive device according to claim 8 , further comprising compensation circuitry configured to interrupt the first signal responsive to the pressure condition in the acoustic chamber being outside the first range of pressure conditions.
20. The pressure-responsive device according to claim 19 , wherein the circuitry is further configured, responsive to the determined presence of the ambient impairment to the port, to mitigate effects of the ambient impairment.
21. The pressure-responsive device according to claim 19 , wherein the circuitry configured to determine the presence or the absence of the ambient impairment is further configured to make the determination based on a comparison of the output signal from the second sensitive region with a threshold.
22. The pressure-responsive device according to claim 21 , wherein the threshold comprises an upper threshold of the first range of pressure conditions.
23. An audio appliance, comprising:
a housing having a housing wall defining a port open to a region external of the housing;
an acoustic chamber positioned within the housing, wherein the port opens to the acoustic chamber and acoustically couples the acoustic chamber with the region external of the housing;
a pressure-responsive transducer having a first pressure-responsive region responsive to a first range of pressure conditions and a second pressure-responsive region responsive to a second range of pressure conditions, wherein the first pressure-responsive region is acoustically coupled with the acoustic chamber and the second pressure-responsive region is acoustically coupled with the acoustic chamber, wherein the pressure-responsive transducer is configured to output a signal corresponding to one or both of a response of the first pressure-responsive region to a pressure condition in the acoustic chamber and a response of the second pressure-responsive region to a pressure condition in the acoustic chamber; and
circuitry configured to modify an output from the pressure-responsive transducer responsive to and in correspondence with a pressure condition in the acoustic chamber being outside the first range of pressure conditions.