Systems and methods for suppressing sound leakage
A bone conduction speaker includes a housing, a vibration board and a transducer. The transducer is located in the housing, and the vibration board is configured to contact with skin and pass vibration. At least one sound guiding hole is set on at least one portion of the housing to guide sound wave inside the housing to the outside of the housing. The guided wave and the leaked sound wave form interference so that the amplitude of the leaked sound wave is reduced.
1. A method of reducing sound leakage, the method comprising:
providing a bone conduction speaker including:
a vibration board;
a transducer configured to cause the vibration board to vibrate;
a housing connected to the transducer, the transducer causing the housing to vibrate, the vibration of the housing producing a leaked sound wave; and
at least one sound guiding hole located on the housing and configured to guide a sound wave inside the housing through the at least one sound guiding hole to an outside of the housing, the guided sound wave having a phase different from a phase of the leaked sound wave in a target region, the guided sound wave changing an amplitude of the leaked sound wave in the target region.
2. The method of claim 1 , wherein:
the at least one sound guiding hole includes two sound guiding holes located on the housing.
3. The method of claim 1 , wherein:
the housing includes a bottom or a sidewall; and
the at least one sound guiding hole located on the bottom or the sidewall of the housing.
4. The method of claim 1 , wherein a location of the at least one sound guiding hole is determined based on at least one of: a vibration frequency of the transducer, a shape of the at least one sound guiding hole, a number of the at least one sound guiding hole, the target region, or a frequency range within which the amplitude of the leaked sound wave is to be changed.
5. The method of claim 1 , wherein the at least one sound guiding hole includes a damping layer, the damping layer configured to adjust the phase of the guided sound wave in the target region.
6. The method of claim 1 , wherein the guided sound wave includes at least two guided sound waves having a same phase in the target region, the at least two sound waves configured to change the amplitude of the leaked sound wave having a same wavelength.
7. The method of claim 1 , wherein the guided sound wave includes at least two guided sound waves having different phases, the at least two sound waves configured to change the amplitude of the leaked sound wave having different wavelengths.
8. The method of claim 1 , wherein the at least one sound guiding hole includes at least two portions, the at least two portions being configured to generate at least two guided sound waves having a same phase in the target region, the at least two guided sound waves configured to change the amplitude of the leaked sound wave having a same wavelength.
9. The method of claim 1 , wherein the at least one sound guiding hole includes at least two different portions, the two different portions being configured to generate at least two guided sound waves having different phases, the at least two guided sound waves configured to change the amplitude of the leaked sound wave having different wavelengths.
10. A bone conduction speaker comprising:
a transducer configured to cause a vibration board to vibrate;
a housing connected to the transducer, the transducer causing the housing to vibrate, the vibration of the housing producing a leaked sound wave; and
at least one sound guiding hole located on the housing and configured to guide a sound wave inside the housing through the at least one sound guiding hole to an outside of the housing, the guided sound wave having a phase different from a phase of the leaked sound wave in a target region, the guided sound wave changing an amplitude of the leaked sound wave in the target region.
11. The bone conduction speaker of claim 10 , wherein:
the housing includes a bottom or a sidewall; and
the at least one sound guiding hole located on the bottom or the sidewall of the housing.
12. The bone conduction speaker of claim 10 , wherein the housing includes a cylindrical sidewall, the at least one sound guiding hole located on the cylindrical sidewall.
13. The bone conduction speaker of claim 12 , wherein the at least one sound guiding hole includes two sound guiding holes.
14. The bone conduction speaker of claim 13 , wherein the two sound guiding holes locate at different heights along the axial direction of the sidewall.
15. The bone conduction speaker of claim 11 , wherein one of the at least one sound guiding hole locates at the center of the bottom.
16. The bone conduction speaker of claim 10 , wherein the at least one sound guiding hole includes a perforative hole.
17. The bone conduction speaker of claim 10 , wherein the at least one sound guiding hole includes a damping layer, the damping layer configured to adjust the phase of the guided sound wave.
18. The bone conduction speaker of claim 17 , wherein the damping layer is a tuning paper, tuning cotton, a nonwoven fabric, a silk, a cotton, a sponge or a rubber.
19. The bone conduction speaker of claim 10 , wherein the shape of the at least one sound guiding hole is circle, ellipse, quadrangle, or linear.
20. The bone conduction speaker of claim 10 , wherein the transducer includes one of:
a magnetic component and a voice coil, or
a piezoelectric ceramics.