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 configured to generate vibrations, the vibrations producing a sound wave inside the housing and causing a leaked sound wave spreading outside the housing;
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; and
at least one acoustic route coupled to the at least one sound guiding hole, wherein the guided sound wave is propagated to the at least one sound guiding hole along the acoustic route, the at least one acoustic route being configured to adjust a frequency of the guided sound wave.
2. The method of claim 1 , wherein the acoustic route is configured to adjust the frequency of the guided sound wave by filtering sound waves in target frequencies.
3. The method of claim 1 , wherein the acoustic route includes one or more lumen structures.
4. The method of claim 3 , wherein at least one of the one or more lumen structures includes an acoustic resistance material for adjusting acoustic impedance of the acoustic route.
5. The method of claim 4 , wherein the acoustic impedance of the acoustic route is in a range of 5MKS Rayleigh to 500MKS Rayleigh.
6. The method of claim 4 , wherein the acoustic resistance material includes at least one of: plastic, textile, metal, permeable material, woven material, screen material or mesh material, porous material, particulate material, or polymer material.
7. The method of claim 1 , wherein the acoustic route includes one or more resonance cavities.
8. The method of claim 7 , wherein at least one of the one or more resonance cavities includes a Helmholtz cavity.
9. The method of claim 7 , wherein at least one of the one or more resonance cavities includes an acoustic resistance material.
10. The method of claim 1 , wherein the acoustic route includes at least one lumen structure and at least one resonance cavity.
11. The method of claim 1 , wherein:
the housing includes a bottom or a sidewall; and
at least one of the at least one sound guiding hole is located on the bottom or the sidewall of the housing.
12. 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.
13. 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.
14. 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.
15. The method of claim 14 , 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.
16. A speaker, comprising:
a housing;
a transducer residing inside the housing and configured to generate vibrations, the vibrations producing a sound wave inside the housing and causing a leaked sound wave spreading outside the housing;
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; and
at least one acoustic route coupled to the at least one sound guiding hole, wherein the guided sound wave is propagated to the at least one sound guiding hole along the acoustic route, the at least one acoustic route being configured to adjust a frequency of the guided sound wave.
17. The speaker of claim 16 , wherein the acoustic route is configured to adjust the frequency of the guided sound wave by filtering sound waves in target frequencies.
18. The speaker of claim 16 , wherein the acoustic route includes one or more lumen structures.
19. The speaker of claim 16 , wherein the acoustic route includes one or more resonance cavities.
20. The speaker of claim 16 , wherein the acoustic route includes at least one lumen structure and at least one resonance cavity.