Apparatus, system, and method for tragus conduction hearable device

1. A wearable apparatus comprising:

a sound transducer positionable against a tragus of a user's ear to convert an electrical signal to a vibration such that the tragus of the user's ear acts as a diaphragm for the sound transducer;

a microphone positionable at an opening of a canal of the user's ear to detect sound pressure of a sound wave produced by the tragus; and

a computing system communicatively coupled to the sound transducer and the microphone and programmed to:

compare an expected sound pressure to sound pressure detected by the microphone; and

calibrate, based on the comparison of the expected sound pressure to the detected sound pressure, a vibration of the sound transducer.

2. The wearable apparatus of claim 1 , wherein:

the microphone is configured to continuously provide feedback produced by the sound transducer during operation of the wearable apparatus; and

the computing system is programmed to calibrate the vibration of the sound transducer during the operation of the wearable apparatus.

3. The wearable apparatus of claim 2 , wherein the computing system is programmed to use an initial calibration to detect whether sound waves detected by the microphone during the operation of the wearable apparatus are an appropriate volume for a user.

4. The wearable apparatus of claim 2 , wherein the computing system is programmed to use an initial calibration to detect whether sound waves detected by the microphone during the operation of the wearable apparatus comprise an appropriate frequency response for a user.

5. The wearable apparatus of claim 1 , wherein the computing system is further programmed to detect, via the microphone, speech from a user.

6. The wearable apparatus of claim 5 , wherein:

the speech from the user comprises a command; and

the computing system is further programmed to direct the sound transducer to provide a response to the command.

7. The wearable apparatus of claim 6 , wherein the computing system comprises an artificial-reality personal assistant.

8. The wearable apparatus of claim 1 , wherein the sound transducer comprises:

a right sound transducer positionable against a tragus of a user's right ear to convert an electrical signal to a vibration such that the tragus of the user's right ear; and

a left sound transducer positionable against a tragus of a user's left ear to convert an electrical signal to a vibration such that the tragus of the user's right left ear.

9. The wearable apparatus of claim 8 , wherein the computing system is configured to calibrate the vibration of the sound transducer by improving a sound balance between the right sound transducer and the left sound transducer.

10. The wearable apparatus of claim 9 , wherein the computing system is configured to improve the sound balance by using a head-related transfer function for the user's right and left ears to adjust sound waves to deliver spatial audio by simulating sound in a three-dimensional space through binaural audio reproduction.

11. The wearable apparatus of claim 10 , wherein:

the head-related transfer function comprises a left head-related transfer function and a right head-related transfer function; and

the computing system is configured to deliver the spatial audio by:

filtering a left signal by driving the left sound transducer with a left head-related transfer function; and

filtering a right signal by driving the right sound transducer with a right head-related transfer function.

12. The wearable apparatus of claim 1 , wherein the computing system is configured to calibrate the vibration of the sound transducer by calibrating the sound transducer to represent sound originating from at least one of varying distances or varying directions.

13. A wearable apparatus comprising:

a left sound transducer positionable against a tragus of a user's left ear to convert a left electrical signal to a left vibration such that the tragus of the user's left ear acts as a left diaphragm for the left sound transducer to produce a left sound wave;

a right sound transducer positionable against a tragus of a user's right ear to convert a right electrical signal to a right vibration such that the tragus of the user's right ear acts as a right diaphragm for the right sound transducer to produce a right sound wave; and

a computing system communicatively coupled to the left and right sound transducers and programmed to calibrate the left vibration of the left sound transducer and the right vibration of the right sound transducer to improve a sound balance between the left sound transducer and the right sound transducer.

14. The wearable apparatus of claim 13 , further comprising:

a left microphone positionable at an opening of a left canal of the user's left ear to detect the left sound wave produced by the tragus of the user's left ear; and

a right microphone positionable at an opening of a right canal of the user's right ear to detect the right sound wave produced by the tragus of the user's right ear.

15. The wearable apparatus of claim 14 , wherein the computing system is programmed to:

compare an expected left sound pressure to left sound pressure detected by the left microphone;

calibrate, based on the comparison of the left expected sound pressure to the left detected sound pressure, a vibration of the left sound transducer;

compare an expected right sound pressure to right sound pressure detected by the right microphone; and

calibrate, based on the comparison of the left expected sound pressure to the right detected sound pressure, a vibration of the right sound transducer.

16. The wearable apparatus of claim 13 , wherein the computing system is configured to improve the sound balance by using a head-related transfer function for the user's right and left ears to adjust sound waves to deliver spatial audio by simulating sound in a three-dimensional space through binaural audio reproduction.

17. The wearable apparatus of claim 16 , wherein:

the head-related transfer function comprises a left head-related transfer function and a right head-related transfer function; and

the computing system is configured to deliver the spatial audio by:

filtering a left signal driving the left sound transducer with a left head-related transfer function; and

filtering a right signal driving the right sound transducer with a right head-related transfer function.

18. A method comprising:

directing a sound transducer positioned against a tragus of a user's ear to convert an electrical signal to a vibration such that the tragus of the user's ear acts as a diaphragm for the sound transducer;

directing a microphone positioned at an opening of a canal of the user's ear to detect sound pressure of a sound wave produced by the tragus; and

comparing an expected sound pressure to sound pressure detected by the microphone;

calibrating, based on the comparison of the expected sound pressure to the detected sound pressure, a vibration of the sound transducer.

19. The method of claim 18 , wherein:

the electrical signal comprises an audio signal associated with an artificial-reality video signal that is synchronized with the audio signal and displayed to a user via a display device of an artificial-reality headset; and

the artificial-reality headset comprises the sound transducer and the microphone.

20. The method of claim 18 , wherein:

the sound transducer comprises:

a right sound transducer positionable against a tragus of a user's right ear to convert an electrical signal to a vibration such that the tragus of the user's right ear acts as a right diaphragm for the right sound transducer; and

a left sound transducer positionable against a tragus of a user's left ear to convert an electrical signal to a vibration such that the tragus of the user's left ear acts as a left diaphragm for the left sound transducer; and

calibrating the vibration of the sound transducer comprises improving a sound balance between the right sound transducer and the left sound transducer.