Hearing protection devices, speakers and noise exposure sensors therefore, and sensor housings and associated methods for the same
A noise sensor is disposed adjacent a speaker within an ear cup of a hearing protection device. The speaker is disposed within a speaker housing and the noise sensor is disposed within a sensor housing, the sensor housing coupled to the speaker housing such that the noise sensor and speaker remain adjacent one another. The noise sensor includes at least a microphone operably coupled to a printed circuit board. The sensor housing defines an axial bore such that the noise sensor can receive acoustic signals via the axial bore. The sensor housing can be coupled to the speaker housing such that the noise sensor is sealed therebetween and receives acoustic signals via a distal end of the axial bore opposite the speaker. A calibration tool can be disposed to the axial bore via the distal end for airtight calibration of the noise sensor.
1. A speaker and noise sensor assembly for a hearing protection device, the speaker and noise sensor assembly comprising:
a speaker dimensioned and configured to be disposed within an ear cup of the hearing protection device;
a sensor housing defining an axial bore having a proximal end and a distal end, the sensor housing disposed along a center axis of the speaker;
a noise sensor comprising a first microphone acoustically coupled with an inner volume of the earcup; and
an external noise sensor assembly comprising a second microphone acoustically coupled with an exterior of the hearing protection device,
wherein the speaker and noise sensor assembly is configured to compare a magnitude of noise exposure measured by the first microphone and a magnitude of noise exposure measured by the second microphone to identify when the noise sensor is in need of calibration, and
wherein the axial bore of the sensor housing is dimensioned and configured to slidably receive, via the distal end, a calibration tool to form an airtight seal with an inner surface of the sensor housing, such that the first microphone is configured to be disposed within a closed system during calibration.
2. The speaker and noise sensor assembly of claim 1 , wherein the noise sensor is sealingly disposed against a surface of the sensor housing such that the first microphone is positioned at the proximal end of the axial bore in acoustic communication with the distal end of the axial bore.
3. The speaker and noise sensor assembly of claim 1 , wherein the microphone is electrically coupled to a printed circuit board (PCB).
4. The speaker and noise sensor assembly of claim 1 , further comprising:
a speaker housing disposed proximate the speaker, wherein the sensor housing is engaged with the speaker housing.
5. The speaker and noise sensor assembly of claim 4 , wherein the sensor housing is engaged with a side of the speaker housing that is opposite the speaker.
6. The speaker and noise sensor assembly of claim 4 , wherein the speaker housing at least partially defines a cavity in which the noise sensor is disposed.
7. The speaker and noise sensor assembly of claim 1 , wherein the axial bore is open on the distal end and sealed at or proximate the proximal end by the noise sensor, and wherein the axial bore is oriented away from the speaker.
8. The speaker and noise sensor assembly of claim 7 , wherein the sensor housing is configured to be securely disposed against a surface of the speaker housing, wherein the noise sensor is configured to be disposed in a cavity defined at least partially between the sensor housing and the speaker housing.
9. The speaker and noise sensor assembly of claim 7 , wherein the sensor housing further defines one or more securing apertures extending through the sensor housing in a direction substantially parallel to the axial bore, wherein the one or more securing apertures are adapted to contact and secure the sensor housing with respect to the speaker housing.
10. The speaker and noise sensor assembly of claim 1 , further comprising:
a securing member comprising one or more securing ridges, the securing member configured such that the sensor housing can be securely coupled to the securing member by slidably disposing the one or more securing ridges of the securing member into the one or more securing apertures of the sensor housing.
11. The speaker and noise sensor assembly of claim 1 , wherein the axial bore of the sensor housing comprises a first portion having a first inner diameter and a second portion distal the first portion having a second inner diameter less than the first inner diameter.
12. A method of calibrating the noise sensor of the speaker and noise sensor assembly of claim 1 , the method comprising:
disposing at least a portion of a calibration tool into the axial bore of the sensor housing via the distal end;
emitting a calibrating sound from the at least the portion of the calibration tool;
receiving, using the first microphone, one or more detected sound characteristics of the calibrating sound emitted from the calibration tool; and
in an instance in which a comparison of the one or more detected sound characteristics of the calibrating sound received by the first microphone and the sound characteristics of the calibrating sound is indicative of a calibration error, calibrating the noise sensor relative to the calibrating sound.
13. The method of claim 12 , further comprising:
disposing the at least the portion of the calibration tool into an axial bore of an external sensor housing;
emitting the calibrating sound from the at least the portion of the calibration tool;
receiving, using the second microphone, the one or more detected sound characteristics of the calibrating sound; and
in an instance in which the comparison of the one or more detected sound characteristics of the calibrating sound received by the second microphone and the sound characteristics of the calibrating sound is indicative of the calibration error, calibrating the external noise sensor relative to the calibrating sound.
14. A hearing protection device comprising:
an ear cup comprising an external casing, an inside surface, and a cushioning material disposed about the inside surface between the inside surface and the external casing, wherein, in an instance in which the cushioning material is sealably disposed against a user's head about the user's ear, an inner volume of the ear cup is substantially airtight;
a speaker dimensioned and configured to be disposed within the ear cup;
a sensor housing defining an axial bore having a proximal end and a distal end, the sensor housing disposed along a center axis of the speaker;
a noise sensor comprising a first microphone acoustically coupled with an inner volume of the earcup; and
an external noise sensor assembly comprising a second microphone acoustically coupled with an exterior of the hearing protection device,
wherein the speaker and noise sensor assembly is configured to compare a magnitude of noise exposure measured by the first microphone and a magnitude of noise exposure measured by the second microphone to identify when the noise sensor is in need of calibration, and
wherein the axial bore of the sensor housing is dimensioned and configured to slidably receive, via the distal end, a calibration tool to form an airtight seal with an inner surface of the sensor housing, such that the first microphone is configured to be disposed within a closed system during calibration.
15. The hearing protection device of claim 14 , wherein the noise sensor is sealingly disposed against a surface of the sensor housing such that the first microphone is positioned at the proximal end of the axial bore in acoustic communication with the distal end of the axial bore.
16. The hearing protection device of claim 14 , further comprising:
a speaker housing disposed proximate the speaker, wherein the sensor housing is engaged with a side of the speaker housing that is opposite the speaker.
17. The hearing protection device of claim 16 , wherein the speaker housing at least partially defines a cavity in which the noise sensor is disposed.
18. The hearing protection device of claim 14 , wherein the axial bore is open on the distal end and sealed at or proximate the proximal end by the noise sensor, and wherein the axial bore is oriented away from the speaker.
19. The hearing protection device of claim 18 , wherein the sensor housing is configured to be securely disposed against a surface of the speaker housing, wherein the noise sensor is configured to be disposed in a cavity defined at least partially between the sensor housing and the speaker housing.
20. The hearing protection device of claim 18 , wherein the sensor housing further defines one or more securing apertures extending through the sensor housing in a direction substantially parallel to the axial bore, wherein the one or more securing apertures are adapted to contact and secure the sensor housing with respect to the speaker housing.