Asymmetric microphone position for beamforming on wearables form factor
A wearable audio device is provided. The wearable audio device may include a first array of microphones linearly arranged on the wearable audio device at a positive angle relative to a horizontal axis of the wearable audio device. The microphones of the first array may be configured to capture far-field audio. The wearable audio device may include a second array of microphones linearly arranged on the wearable audio device at a negative angle relative to the horizontal axis. The microphones of the second array may be configured to capture near-field audio. The wearable audio device may include circuitry arranged to (1) generate a user voice audio signal based on the captured near-field audio, (2) generate a desired audio signal based on the captured far-field audio, and (3) generate a differentiated signal based on the desired audio signal and the user voice audio signal.
1. A wearable audio device, comprising:
a first array of microphones linearly arranged on the wearable audio device at a positive angle relative to a horizontal axis of the wearable audio device, wherein the first array of microphones are configured to capture, relative to the wearable audio device, far-field audio, wherein the horizontal axis follows a temple of the wearable audio device; and
a second array of microphones linearly arranged on the wearable audio device at a negative angle relative to the horizontal axis of the wearable audio device, wherein the second array of microphones are configured to capture, relative to the wearable audio device, near-field audio.
2. The wearable audio device of claim 1 , further comprising circuitry arranged to: generate a user voice audio signal based on the captured near-field audio; generate a far-field audio signal based on the captured far-field audio; and generate a differentiated signal based on the far-field audio signal and the user voice audio signal.
3. The wearable audio device of claim 2 , wherein the differentiated signal is generated by subtracting the user voice audio signal from the far-field audio signal.
4. The wearable audio device of claim 1 , wherein the first array of microphones comprise a noise-capturing subset of microphones proximate to a first distal end of the wearable audio device, wherein the noise-capturing subset of microphones are configured to capture rear-field audio.
5. The wearable audio device of claim 4 , further comprising circuitry arranged to:
generate a rear noise audio signal based on the captured rear-field audio;
generate a far-field audio signal based on the captured far-field audio; and
generate a noise-rejected signal based on the far-field audio signal and the rear noise audio signal.
6. The wearable audio device of claim 5 , wherein the noise-rejected audio signal is generated by subtracting the rear noise audio signal from the far-field audio signal.
7. The wearable audio device of claim 4 , wherein the second array of microphones comprise a noise-capturing subset of microphones proximate to a second distal end of the wearable audio device, wherein the noise-capturing subset of microphones are configured to capture rear-field audio.
8. The wearable audio device of claim 1 , wherein the first array of microphones consists of two microphones.
9. The wearable audio device of claim 1 , wherein the microphones of the first and second array of microphones are omnidirectional.
10. The wearable audio device of claim 1 , wherein the wearable audio device is a set of audio eyeglasses.
11. The wearable audio device of claim 1 , wherein the first array of microphones are arranged proximate to the temple of the wearable audio device.
12. The wearable audio device of claim 1 , wherein the second array of microphones is configured to capture sound audible within 60 centimeters of the wearable audio device.
13. The wearable audio device of claim 1 , wherein the first array of microphones is configured to capture sound audible beyond 60 centimeters from the wearable audio device.
14. The wearable audio device of claim 1 , wherein the positive angle of the first array of microphones is less than the negative angle of the second array of microphones.
15. The wearable audio device of claim 1 , wherein the positive angle is 30 degrees.
16. The wearable audio device of claim 1 , wherein the negative angle is 45 degrees.
17. A method for capturing and processing audio with a wearable audio device, comprising:
capturing, via a first array of microphones linearly arranged on a wearable audio device at a positive angle relative to a horizontal axis of the wearable audio device, far-field audio, wherein the horizontal axis follows a temple of the wearable audio device; and
capturing, via a second array of microphones linearly arranged on a wearable audio device at a negative angle relative to the horizontal axis of the wearable audio device, near-field audio.
18. The method of claim 17 , further comprising:
generating, via circuitry of the wearable audio device, a user voice audio signal based on the captured near-field audio;
generating, via circuitry of the wearable audio device, a far-field audio signal based on the captured far-field audio; and
generating, via circuitry of the wearable audio device, a differentiated signal based on the far-field audio signal and the user voice audio signal.
19. The method of claim 17 , further comprising capturing, via a noise capturing subset of the first array of microphones wherein the microphones of the noise capturing subset are proximate to a distal end of the wearable audio device, rear-field audio.
20. The method of claim 19 , further comprising: generating, via circuitry of the wearable audio device, a rear noise audio signal based on the captured rear-field audio; generating, via circuitry of the wearable audio device, a far-field audio signal based on the captured far-field audio; and generating, via circuitry of the wearable audio device, a noise-rejected signal based on the far-field audio signal and the rear noise audio signal.