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 sound wave interfaces with the leaked sound wave, and the interfacing reduces a sound pressure level of at least a portion of the leaked sound wave. A frequency of the at least a portion of the leaked sound wave is lower than 4000 Hz.
1. A 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 including a damping layer, wherein:
the at least one sound guiding hole is configured to guide a sound wave inside the housing through the at least one sound guiding hole and the damping layer to an outside of the housing, the guided sound wave interfacing with the leaked sound wave, and
the damping layer is configured to adjust a phase and amplitude of the guided sound wave.
2. The method of claim 1 , wherein the damping layer includes at least one of a tuning paper, a tuning cotton, a nonwoven fabric, a silk, a cotton, a sponge, or a rubber.
3. The method of claim 1 , wherein the interference between the guided sound wave and the leaked sound wave reduces an amplitude of the leaked sound wave.
4. The method of claim 3 , 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, a target region where the amplitude of the leaked sound wave is to be reduced, or a frequency range within which the amplitude of the leaked sound wave is to be reduced.
5. The method of claim 3 , wherein the at least one sound guiding hole includes at least two portions, the at least two portions of the at least one sound guiding hole being configured to generate at least two guided sound waves having a same phase, the at least two guided sound waves being configured to reduce an amplitude of the leaked sound wave having a same wavelength.
6. The method of claim 3 , wherein the at least one sound guiding hole includes at least two different portions, the two different portions of the at least one sound guiding hole being configured to generate at least two guided sound waves having different phases, the at least two guided sound waves being configured to reduce an amplitude of the leaked sound wave having different wavelengths.
7. The method of claim 1 , wherein the interference between the guided sound wave and the leaked sound wave reduces a sound pressure level of at least a portion of the leaked sound wave, a frequency of the at least a portion of the leaked sound wave being lower than 4000 Hz.
8. The method of claim 1 , wherein:
the housing includes an opening, and the vibration board stretches out from the opening of the housing.
9. The method of claim 1 , wherein the bone conduction speaker further comprises a linking component residing between the transducer and the housing, the linking component being configured to fix the transducer inside the housing.
10. A bone conduction speaker comprising:
a vibration board;
a transducer configured to cause the vibration board to vibrate;
a housing enclosing the vibration board and 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 including a damping layer, wherein:
the at least one sound guiding hole is configured to guide a sound wave inside the housing through the at least one sound guiding hole and the damping layer to an outside of the housing, the guided sound wave interfacing with the leaked sound wave, and
the damping layer is configured to adjust a phase and amplitude of the guided sound wave.
11. The bone conduction speaker of claim 10 , wherein the damping layer includes at least one of a tuning paper, a tuning cotton, a nonwoven fabric, a silk, a cotton, a sponge, or a rubber.
12. The bone conduction speaker of claim 10 , wherein the interference between the guided sound wave and the leaked sound wave reduces an amplitude of the leaked sound wave.
13. The bone conduction speaker of claim 12 , 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, a target region where the amplitude of the leaked sound wave is to be reduced, or a frequency range within which the amplitude of the leaked sound wave is to be reduced.
14. The bone conduction speaker of claim 12 , wherein the at least one sound guiding hole includes at least two portions, the at least two portions of the at least one sound guiding hole being configured to generate at least two guided sound waves having a same phase, the at least two guided sound waves being configured to reduce an amplitude of the leaked sound wave having a same wavelength.
15. The bone conduction speaker of claim 12 , wherein the at least one sound guiding hole includes at least two different portions, the two different portions of the at least one sound guiding hole being configured to generate at least two guided sound waves having different phases, the at least two guided sound waves being configured to reduce an amplitude of the leaked sound wave having different wavelengths.
16. The bone conduction speaker of claim 10 , wherein the interference between the guided sound wave and the leaked sound wave reduces a sound pressure level of at least a portion of the leaked sound wave, a frequency of the at least a portion of the leaked sound wave being lower than 4000 Hz.
17. The bone conduction speaker of claim 10 , wherein:
the housing includes an opening, and the vibration board stretches out from the opening of the housing.
18. The bone conduction speaker of claim 10 , wherein the bone conduction speaker further comprises a linking component residing between the transducer and the housing, the linking component being configured to fix the transducer inside the housing.
19. The bone conduction speaker of claim 10 , wherein:
the housing includes a bottom or a sidewall; and
the at least one sound guiding hole is located on the bottom or the sidewall of the housing.
20. The bone conduction speaker of claim 10 , wherein the at least one sound guiding hole includes a perforative hole.