System and method for reducing wind noise in an electronic hearing protector
Systems and methods for reducing wind noise in an electronic hearing protector are provided. The electronic hearing protector includes a housing and a windscreen. The housing includes a cut-out portion having at least one acoustic inlet. The windscreen covers the cut-out portion and includes an outer surface. An acoustic path within the cut-out portion from an effective center of the acoustic inlet(s) to the windscreen is at least 100 degrees. A minimum distance from the effective center of the acoustic inlet(s) to the outer surface of the windscreen is at least 2.5 millimeters. In various embodiments, the electronic hearing protector may include a high-level limiter disposed in the housing. The high-level limiter selectively attenuates a frequency below a voice range more than a frequency in the voice range of a microphone input signal to provide a signal output with noise reduction at frequencies outside of the voice range.
1. An in-the-ear electronic earplug comprising:
a variable spectrum attenuator configured to receive a microphone input signal and output a signal output and a sensing output;
an amplifier configured to amplify the signal output received from the variable spectrum attenuator to generate an amplifier output;
a control signal generator configured to receive one or both of the sensing output from the variable spectrum attenuator and the amplifier output from the amplifier, the control signal generator responsively generating an attenuator control signal that is provided to the variable spectrum attenuator,
wherein the attenuator control signal directs the variable spectrum attenuator to selectively attenuate a frequency below a voice range more than a frequency in the voice range of the microphone input signal to provide the signal output when one or both of the sensing output and the amplifier output exceeds a threshold.
2. The in-the-ear electronic earplug of claim 1 , wherein the attenuator control signal directs the variable spectrum attenuator to maintain the signal output when the sensing output and the amplifier output do not exceed the threshold.
3. The in-the-ear electronic earplug of claim 1 , wherein the control signal generator is configured to receive the sensing output from the variable spectrum attenuator and responsively generate the attenuator control signal based on the sensing output.
4. The in-the-ear electronic earplug of claim 1 , wherein the control signal generator is configured to receive the amplifier output from the amplifier and responsively generate the attenuator control signal based on the amplifier output.
5. The in-the-ear electronic earplug of claim 1 , wherein the variable spectrum attenuator comprises a high pass filter and a low pass filter operable in response to the attenuator control signal when the one or both of the sensing output and the amplifier output exceeds the threshold.
6. The in-the-ear electronic earplug of claim 5 , wherein the variable spectrum attenuator comprises a voltage control controlled resistor, wherein the high pass filter and the low pass filter are operable based on the voltage controlled resistor responsive to the attenuator control signal.
7. The in-the-ear electronic earplug of claim 6 , wherein the variable spectrum attenuator comprises a feedback filter configured to provide negative signal feedback to the voltage controlled resistor to cancel even harmonic distortion.
8. The in-the-ear electronic earplug of claim 1 , wherein the variable spectrum attenuator comprises at least one diode configured to clamp instantaneous peaks in the microphone input signal.
9. The in-the-ear electronic earplug of claim 1 , comprising a receiver configured to convert the amplifier output to sound.
10. The in-the-ear electronic earplug of claim 1 , comprising:
a housing comprising a cut-out portion having at least one acoustic inlet, wherein the variable spectrum attenuator, the control signal generator, and the amplifier are disposed within the housing; and
a windscreen covering the cut-out portion of the housing, the windscreen having an outer surface,
wherein an acoustic path within the cut-out portion of the housing from an effective center of the at least one acoustic inlet to the windscreen is at least 100 degrees, and
wherein a minimum distance from the effective center of the at least one acoustic inlet to the outer surface of the windscreen is at least 2.5 millimeters.