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; 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 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
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 damping layer is attached on an inner wall of the at least one sound guiding hole.
4. The method of claim 1 , wherein the damping layer shields the at least one sound guiding hole from an outside of the at least one sound guiding hole.
5. 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.
6. 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.
7. The method of claim 1 , wherein the guided sound wave includes at least two sound waves having different phases.
8. The method of claim 7 , wherein the at least one sound guiding hole includes two sound guiding holes located on the housing.
9. The method of claim 8 , 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.
10. 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.
11. The method of claim 10 , 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.
12. 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 2000 Hz to 2500 Hz.
13. The method of claim 12 , wherein the sound pressure level of the at least a portion of the leaked sound wave is reduced by more than 20 dB on average.
14. 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; 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 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
the damping layer is configured to adjust a phase and amplitude of the guided sound wave.
15. The speaker of claim 14 , 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.
16. The speaker of claim 14 , wherein the damping layer is attached on an inner wall of the at least one sound guiding hole.
17. The speaker of claim 14 , wherein the damping layer shields the at least one sound guiding hole from an outside of the at least one sound guiding hole.
18. The speaker of claim 14 , 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 speaker of claim 14 , 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.
20. The speaker of claim 19 , 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.