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 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 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, wherein
the sound pressure level of the leaked sound wave within a target frequency range is reduced by 10 dB on average or more than 10 dB on average.
2. The speaker of claim 1 , wherein the target frequency range is within a range of 1500 Hz to 3000 Hz.
3. The speaker of claim 2 , wherein the frequency range is within a range of 2000 Hz to 2700 Hz.
4. The speaker of claim 3 , wherein the sound pressure level of the leaked sound wave within the target frequency range is reduced by 20 dB or more than 20 dB on average.
5. The speaker of claim 3 , wherein the sound pressure level of the leaked sound wave at 2300 Hz is reduced by more than 20 dB.
6. The speaker of claim 1 , further including a damping layer configured to adjust a phase and amplitude of the guided sound wave.
7. The speaker of claim 6 , 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.
8. The speaker of claim 7 , 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.
9. The speaker of claim 1 , wherein the at least one sound guiding hole includes at least two sound guiding holes located on the housing.
10. The speaker of claim 9 , wherein the guided sound wave includes at least two sound waves having a same phase.
11. The speaker of claim 10 , wherein the at least two guided sound waves having the same phase are configured to reduce the sound pressure level of the leaked sound wave.
12. The speaker of claim 11 , wherein the at least two guided sound waves have a same wavelength.
13. The speaker of claim 9 , wherein the guided sound wave includes at least two sound waves having different phases.
14. The speaker of claim 13 , wherein the at least two sound waves are configured to reduce the sound pressure level of the leaked sound wave.
15. The speaker of claim 14 , wherein the at least two sound waves have different wavelengths.
16. The speaker of claim 15 , wherein the at least two sound guiding holes are arranged to generate the at least two sound waves having different phases.
17. The speaker of claim 1 , wherein:
the housing includes an opening and a vibration board, the vibration board stretching out from the opening of the housing and vibrating synchronically with the transducer.
18. The speaker of claim 1 , 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 speaker 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.
20. The speaker of claim 1 , wherein the at least one sound guiding hole includes a perforative hole.