Multipurpose microphone in acoustic devices

1. A method comprising:

receiving an input signal representing audio captured by a sensor disposed in an active noise reduction (ANR) device;

determining, by one or more processing devices, that the ANR device is operating in a first operational mode;

responsive to determining that the ANR device is operating in the first operational mode,

applying a first gain to the input signal to generate a first amplified input signal and

providing the first amplified input signal to a first processor corresponding to the first operational mode;

determining, by the one or more processing devices, that the ANR device is operating in a second operational mode different from the first operational mode;

responsive to determining that the ANR device is operating in the second operational mode,

applying a second gain to the input signal to generate a second amplified input signal, wherein the second gain is different from the first gain, and

providing the second amplified input signal to a second processor, separate from the first processor, corresponding to the second operational mode;

processing the first or second amplified input signal to generate an output signal; and

generating, by an acoustic transducer, an audio output based on the output signal.

2. The method of claim 1 , wherein the first operational mode of the ANR device comprises a voice communications mode.

3. The method of claim 1 , wherein the second operational mode of the ANR device comprises a noise reduction mode.

4. The method of claim 1 , wherein the sensor comprises a microphone of the ANR device.

5. The method of claim 1 , wherein the output signal comprises a drive signal for the acoustic transducer.

6. The method of claim 5 , comprising:

processing the first or second amplified input signal using at least one compensator to generate the drive signal for the acoustic transducer, the drive signal including an anti-noise signal.

7. The method of claim 1 , comprising:

receiving a second input signal representing audio captured by a second sensor disposed in the ANR device;

combining the first or second amplified input signal and the second input signal to produce a combined input signal; and

processing the combined input signal using at least one compensator to generate the output signal for the ANR device, the output signal including an anti-noise signal.

8. The method of claim 1 , comprising:

receiving a second input signal representing audio captured by a second sensor disposed in the ANR device;

processing the first or second amplified input signal and the second input signal to steer a beam toward the mouth of a user of the ANR device to generate a primary signal;

processing the corresponding amplified input signal and the second input signal to steer a null toward the mouth of the user of the ANR device to generate a reference signal; and

processing the primary signal using the reference signal as a noise reference to generate the output signal for the ANR device.

9. The method of claim 8 , wherein the beam or null is steered using one of: a near field beamforming technique or a delay-and-sum beamforming technique.

10. The method of claim 1 , comprising, responsive to determining that the ANR device is operating in the second operational mode, decoupling the first amplified input signal from the first processor.

11. An active noise reduction (ANR) device comprising:

one or more sensors for capturing audio;

at least one amplifier that amplifies an input signal representative of the audio captured by the one or more sensors;

a controller comprising one or more processing devices, wherein the controller is configured to:

determine that the ANR device is operating in a first operational mode,

responsive to determining that the ANR device is operating in the first operational mode, apply a first gain to the input signal to generate a first amplified input signal and provide the first amplified input signal to a first processor corresponding to the first operational mode,

determine that the ANR device is operating in a second operational mode different from the first operational mode,

responsive to determining that the ANR device is operating in the second operational mode, apply a second gain to the input signal to generate a second amplified input signal, wherein the second gain is different from the first gain, and provide the second amplified input signal to a second processor, separate from the first processor, corresponding to the second operational mode, and

process the first or second amplified input signal to generate an output signal; and

an acoustic transducer for generating an audio output based on the output signal.

12. The device of claim 11 , wherein the first operational mode of the ANR device comprises a voice communications mode.

13. The device of claim 11 , wherein the second operational mode of the ANR device comprises a noise reduction mode.

14. The device of claim 11 , wherein the sensor comprises a microphone of the ANR device.

15. The device of claim 11 , wherein the output signal comprises a drive signal for the acoustic transducer.

16. The device of claim 15 , wherein the controller comprises at least one compensator that processes the first or second amplified input signal to generate the drive signal for the acoustic transducer, the drive signal including an anti-noise signal.

17. The device of claim 11 , wherein the controller is configured to:

receive a second input signal representing audio captured by a second sensor disposed in the ANR device;

combine the first or second amplified input signal and the second input signal to produce a combined input signal; and

process the combined input signal using at least one compensator to generate the output signal for the ANR device, the output signal including an anti-noise signal.

18. The device of claim 11 , wherein the controller is configured to:

receive a second input signal representing audio captured by a second sensor disposed in the ANR device;

process the first or second amplified input signal and the second input signal to steer a beam toward the mouth of a user of the ANR device to generate a primary signal;

process the corresponding amplified input signal and the second input signal to steer a null toward the mouth of the user of the ANR device to generate a reference signal; and

process the primary signal using the reference signal as a noise reference to generate the output signal for the ANR device.

19. The device of claim 18 , wherein the beam or null is steered using one of: a near field beamforming technique or a delay-and-sum beamforming technique.

20. The device of claim 11 , wherein the controller configured to, responsive to determining that the ANR device is operating in the second operational mode, decouple the first amplified input signal from the first processor.

21. One or more non-transitory machine-readable storage devices storing machine-readable instructions that cause one or more processing devices to execute operations comprising:

receiving an input signal representing audio captured by a sensor disposed in an active noise reduction (ANR) device;

determining that the ANR device is operating in a first operational mode;

responsive to determining that the ANR device is operating in the first operational mode,

applying a first gain to the input signal to generate a first amplified input signal and

providing the first amplified input signal to a first processor corresponding to the first operational mode;

determining that the ANR device is operating in a second operational mode different from the first operational mode;

responsive to determining that the ANR device is operating in the second operational mode,

applying a second gain to the input signal to generate a second amplified input signal, wherein the second gain is different from the first gain, and

providing the second amplified input signal to a second processor, separate from the first processor, corresponding to the second operational mode;

processing the first or second amplified input signal to generate an output signal; and

causing an acoustic transducer to generate an audio output based on the output signal.

22. The one or more non-transitory machine-readable storage devices of claim 21 , wherein the first operational mode of the ANR device comprises a voice communications mode, and wherein the second operational mode of the ANR device comprises a noise reduction mode.