Systems and methods for suppressing sound leakage
A speaker comprises a housing, a transducer residing inside the housing, and at least one sound guiding hole located on the housing. The transducer generates vibrations. The vibrations produce a sound wave inside the housing and cause a leaked sound wave spreading outside the housing from a portion of the housing. The at least one sound guiding hole guides the sound wave inside the housing through the at least one sound guiding hole to an outside of the housing. The guided sound wave interferes with the leaked sound wave in a target region. The interference at a specific frequency relates to a distance between the at least one sound guiding hole and the portion of the housing.
1. A method, comprising:
providing a speaker including:
a housing;
a transducer residing inside the housing and including compound vibration parts configured to generate vibrations, the vibrations producing a sound wave inside the housing and causing a leaked sound wave spreading outside the housing, wherein
the compound vibration parts include two or more vibration parts at least partially attach to each other, at least two of the two or more vibration parts having different stiffness coefficients; and
at least one sound guiding hole located on the housing and configured to guide the 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, the guided sound wave interfering with the leaked sound wave in a target region, and the interference reducing a sound pressure level of the leaked sound wave in the target region.
2. The method of claim 1 , wherein the two or more vibration parts at least include a vibration conductive plate and a vibration board.
3. The method of claim 2 , wherein the stiffness coefficient of the vibration board is larger than the stiffness coefficient of the vibration conductive plate.
4. The method of claim 2 , wherein a thickness of the vibration conductive plate is not less than 0.005 mm.
5. The method of claim 2 , wherein a material of the vibration conductive plate includes at least one of: beryllium copper, titanium alloy, polyethylene.
6. The method of claim 2 , wherein a material of the vibration conductive plate includes at least one of: single material or a composite material, the composite material including at least one of: glass fiber, carbon fiber, boron fiber, graphite fiber, graphene fiber, silicon carbide fiber, aramid fiber, glass fiber reinforced by unsaturated polyester and epoxy, or fiberglass comprising phenolic resin matrix.
7. The method of claim 1 , wherein the vibrations have at least two resonance peaks, a frequency of at least one of the at least two resonance peaks being catchable with human ears.
8. The method of claim 7 , wherein the frequency of the at least one of the at least two resonance peaks is in a range of 80 Hz-18000 Hz.
9. 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.
10. 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, the target region, or a frequency range within which the sound pressure level of the leaked sound wave is to be reduced.
11. The method of claim 1 , wherein the at least one sound guiding hole includes a damping layer, the damping layer being configured to adjust the phase of the guided sound wave in the target region.
12. The method of claim 1 , wherein the guided sound wave includes at least two sound waves having different phases.
13. The method of claim 12 , wherein the at least one sound guiding hole includes two sound guiding holes located on the housing.
14. The method of claim 13 , wherein the two sound guiding holes are arranged to generate the at least two sound waves having different phases to reduce the sound pressure level of the leaked sound wave having different wavelengths.
15. The method of claim 1 , wherein at least a portion of the leaked sound wave whose sound pressure level is reduced is within a range of 1500 Hz to 3000 Hz.
16. The method of claim 15 , wherein the sound pressure level of the at least a portion of the leaked sound wave is reduced by more than 10 dB on average.
17. A speaker, comprising:
a housing;
a transducer residing inside the housing and including compound vibration parts configured to generate vibrations,
the vibrations producing a sound wave inside the housing and causing a leaked sound wave spreading outside the housing, wherein
the compound vibration parts include two or more vibration parts at least partially attach to each other, at least two of the two or more vibration parts having different stiffness coefficients; and
at least one sound guiding hole located on the housing and configured to guide the 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, the guided sound wave interfering with the leaked sound wave in a target region, and the interference reducing a sound pressure level of the leaked sound wave in the target region.
18. The speaker of claim 17 , wherein the two or more vibration parts at least include a vibration conductive plate and a vibration board.
19. The speaker of claim 18 , wherein the stiffness coefficient of the vibration board is larger than the stiffness coefficient of the vibration conductive plate.
20. The speaker of claim 17 , wherein a thickness of the vibration conductive plate is not less than 0.005 mm.