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 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 interfacing with the leaked sound wave, the interfacing reducing 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.
2. The method of claim 1 , wherein the frequency of the at least a portion of the leaked sound wave is within a range of 1000 Hz to 4000 Hz.
3. The method of claim 1 , wherein the frequency of the at least a portion of the leaked sound wave is within a range of 1500 Hz to 3000 Hz.
4. The method of claim 3 , wherein the sound pressure level of the at least a portion of the leaked sound wave is reduced by 10 dB or more than 10 dB on average.
5. The method of claim 1 , wherein the frequency of the at least a portion of the leaked sound wave is within a range of 2000 Hz to 2500 Hz.
6. The method of claim 5 , wherein the sound pressure level of the at least a portion of the leaked sound wave is reduced by 20 dB or more than 20 dB on average.
7. The method of claim 1 , 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.
8. 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, a target region where the sound pressure level of the at least a portion of the leaked sound wave is to be reduced, or a frequency range of the at least a portion of the leaked sound wave.
9. The method of claim 1 , wherein the at least one sound guiding hole includes a damping layer, the damping layer being configured to adjust a phase and an amplitude of the guided sound wave.
10. The method of claim 1 , 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 change the sound pressure level of the leaked sound wave having a same wavelength.
11. The method of claim 1 , 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 change the sound pressure level of the leaked sound wave having different wavelengths.
12. 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 interfacing with the leaked sound wave, the interfacing reducing 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.
13. The bone conduction speaker of claim 12 , wherein the frequency of the at least a portion of the leaked sound wave is within a range of 1000 Hz to 4000 Hz.
14. The bone conduction speaker of claim 12 , wherein the frequency of the at least a portion of the leaked sound wave is within a range of 1500 Hz to 3000 Hz.
15. The bone conduction speaker of claim 14 , wherein the sound pressure level of the at least a portion of the leaked sound wave is reduced by 10 dB or more than 10 dB on average.
16. The bone conduction speaker of claim 12 , wherein the frequency of the at least a portion of the leaked sound wave is within a range of 2000 Hz to 2500 Hz.
17. The method of claim 16 , wherein the sound pressure level of the at least a portion of the leaked sound wave is reduced by 20 dB or more than 20 dB on average.
18. The bone conduction speaker of claim 12 , 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.
19. The bone conduction speaker of claim 12 , wherein the housing includes a cylindrical sidewall, and the at least one sound guiding hole is located on the cylindrical sidewall.
20. The bone conduction speaker of claim 12 , wherein the at least one sound guiding hole includes a damping layer, the damping layer being configured to adjust a phase and an amplitude of the guided sound wave.