Ear-plug device with in-ear cartilage conduction transducer

1. An ear-plug device comprising:

a body configured to at least partially fit inside an ear canal of a user;

a cartilage conduction transducer coupled to the body and located within the ear canal, the cartilage conduction transducer configured to vibrate a tissue of the ear canal creating one or more airborne acoustic pressure waves in the ear canal corresponding to and for presentation of audio content to the user; and

an air conduction transducer coupled to the body and located within the ear canal, the air conduction transducer configured to generate airborne acoustic pressure waves in the ear canal based at least in part on sounds from a local area outside of the ear canal.

2. The ear-plug device of claim 1 , wherein the ear-plug device further includes at least one microphone positioned inside the ear canal and configured to detect sounds from within the ear canal generated by at least one of the cartilage conduction transducer and the air conduction transducer.

3. The ear-plug device of claim 2 , wherein the ear-plug device further includes a controller configured to generate vibration instructions for the at least one of the cartilage conduction transducer and the air conduction transducer based at least in part on the detected sounds from within the ear canal.

4. The ear-plug device of claim 1 , wherein the cartilage conduction transducer is configured to vibrate the tissue of the ear canal in a radial direction for creating the one or more airborne acoustic pressure waves, the radial direction pointing along one or more radii orthogonal to a central axis of the ear canal.

5. The ear-plug device of claim 1 , wherein the cartilage conduction transducer is configured to vibrate the tissue of the ear canal in a transverse direction parallel to a central axis of the ear canal for creating the one or more airborne acoustic pressure waves.

6. The ear-plug device of claim 1 , wherein the cartilage conduction transducer includes an outer surface that has a radius of curvature such that the cartilage conduction transducer fits within the ear canal.

7. The ear-plug device of claim 1 , wherein the ear-plug device further includes an outer layer configured to:

couple the cartilage conduction transducer to the tissue of the ear canal; and

reduce an impedance mismatch between the cartilage conduction transducer and the tissue of the ear canal below a threshold level.

8. The ear-plug device of claim 1 , wherein the ear-plug device further includes a waveguide positioned along the body and partially located inside the ear canal.

9. The ear-plug device of claim 8 , wherein the waveguide propagates the airborne acoustic pressure waves into the ear canal.

10. The ear-plug device of claim 8 , wherein the waveguide propagates the sounds from the local area into the ear canal.

11. The ear-plug device of claim 8 , wherein the ear-plug device further includes a controllable block configured to attenuate the sounds from the local area propagating through the waveguide into the ear canal, an amount of attenuation based on a state of the controllable block.

12. The ear-plug device of claim 11 , wherein the controllable block is a mechanical shutter that obstructs the waveguide, and the amount of obstruction is based on the state of the controllable block.

13. The ear-plug device of claim 8 , wherein the air conduction transducer is configured to generate the airborne acoustic pressure waves in the ear canal to attenuate the sounds from the local area propagating through the waveguide into the ear canal.

14. The ear-plug device of claim 1 , wherein the ear-plug device further includes at least one microphone positioned externally from the ear canal and configured to detect the sounds from the local area.

15. The ear-plug device of claim 14 , wherein the at least one microphone is positioned at an entrance to the ear canal.

16. The ear-plug device of claim 14 , wherein the at least one microphone is positioned to detect a speech of the user.

17. A method comprising:

generating vibration instructions using audio content;

instructing, based on the vibration instructions, a cartilage conduction transducer located within an ear canal of a user to vibrate a tissue of the ear canal creating one or more airborne acoustic pressure waves in the ear canal, the one or more airborne acoustic pressure waves corresponding to and for presentation of the audio content to the user; and

instructing, based at least in part on sounds from a local area outside of the ear canal, an air conduction transducer located within the ear canal to generate airborne acoustic pressure waves in the ear canal.

18. The method of claim 17 , further comprising:

detecting, by at least one microphone positioned inside the ear canal, sounds from within the ear canal generated by at least one of the cartilage conduction transducer and the air conduction transducer; and

updating the vibration instructions based at least in part on the detected sounds from within the ear canal.

19. An audio system comprising:

an ear-plug device including:

a body configured to at least partially fit inside an ear canal of a user,

a cartilage conduction transducer coupled to the body and located within the ear canal, the cartilage conduction transducer configured to vibrate a tissue of the ear canal creating one or more airborne acoustic pressure waves in the ear canal corresponding to and for presentation of audio content to the user, and

an air conduction transducer coupled to the body and located within the ear canal, the air conduction transducer configured to generate airborne acoustic pressure waves in the ear canal based at least in part on sounds from a local area outside of the ear canal; and

a controller configured to:

generate vibration instructions, and

provide the vibration instructions to the cartilage conduction transducer and the air conduction transducer for presentation of the audio content to the user.

20. The audio system of claim 19 , wherein:

the ear-plug device further includes at least one microphone positioned inside the ear canal and configured to detect sounds from within the ear canal generated by at least one of the cartilage conduction transducer and the air conduction transducer; and

the controller is further configured to update the vibration instructions based at least in part on the detected sounds from within the ear canal.