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 configured to be worn by a user, the speaker including:
a housing having an inner side facing the user, the inner side including a first portion that is in contact with the user and a second portion that is not in contact with the user;
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 second portion of the inner side 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 at least one sound guiding hole on the second portion of the inner side faces an ear canal of the user.
3. The method of claim 1 , wherein the housing includes a bottom side and a sidewall, the bottom side facing away from the user and being opposite to the inner side of the housing, the sidewall being located between the inner side and the bottom side.
4. The method of claim 3 , wherein the second portion of the inner side is located between the first portion of the inner side and the sidewall of the housing.
5. The method of claim 3 , further comprising another sound guiding hole located on the bottom side 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 at least one sound guiding hole includes a damping layer, the damping layer adjusting the phase of the guided sound wave in the target region.
8. The method of claim 1 , wherein the guided sound wave includes at least two sound waves having different phases.
9. The method of claim 8 , wherein the at least one sound guiding hole includes two sound guiding holes.
10. The method of claim 9 , 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.
11. 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.
12. The method of claim 11 , 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.
13. 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.
14. The method of claim 13 , 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.
15. A speaker configured to be worn by a user, comprising:
a housing having an inner side facing the user, the inner side of the housing including a first portion that is in contact with the user and a second portion that is not in contact with the user;
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 second portion of the inner side 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.
16. The speaker of claim 15 , wherein the at least one sound guiding hole on the second portion of the inner side faces an ear canal of the user.
17. The speaker of claim 15 , wherein the housing includes a bottom side and a sidewall, the bottom side facing away from the user and being opposite to the inner side of the housing, the sidewall being located between the inner side and the bottom side.
18. The speaker of claim 17 , wherein the second portion of the inner side is located between the first portion of the inner side and the sidewall of the housing.
19. The speaker of claim 17 , further comprising another sound guiding hole located on the bottom side or the sidewall of the housing.
20. The speaker of claim 15 , wherein the at least one sound guiding hole includes a damping layer, the damping layer adjusting the phase of the guided sound wave in the target region.