Systems and methods for suppressing sound leakage
A bone conduction speaker includes a housing, a vibration board and a transducer. The transducer is located in the housing, and the vibration board is configured to contact with skin and pass vibration. At least one sound guiding hole is set on at least one portion of the housing to guide sound wave inside the housing to the outside of the housing. The guided sound wave interfaces with the leaked sound wave, and the interfacing reduces a sound pressure level of at least a portion of the leaked sound wave. A frequency of the at least a portion of the leaked sound wave is lower than 4000 Hz.
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 from a portion of 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 by a first sound pressure level at a first frequency, and reducing the sound pressure level of the leaked sound wave by a second sound pressure level at a second frequency, wherein
the first frequency is lower than the second frequency and the first sound pressure level is larger than the second sound pressure level.
2. The method of claim 1 , wherein:
the first frequency is in a range of 1300 Hz-3000 Hz; and
the second frequency is in a range of 3000 Hz-4000 Hz.
3. The method of claim 1 , wherein the first sound pressure level at the first frequency is larger than 10 dB.
4. 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.
5. The method of claim 1 , wherein the at least one sound guiding hole is arranged on a wall of the housing different from a wall on which the portion of the housing is located.
6. The method of claim 1 , wherein the at least one sound guiding hole and the portion of the housing are located on a same side of a user's ear.
7. The method of claim 6 , wherein a sound path from the at least one sound guiding hole to the user's ear is larger than a sound path from the portion of the housing to the user's ear.
8. The method of claim 1 , wherein a ratio of a distance between the at least one sound guiding hole and a user's ear to a distance between the at least one sound guiding hole and the portion of the housing is less than or equal to 0.3.
9. The method of claim 8 , wherein the distance between the at least one sound guiding hole and the portion of the housing is less than or equal to 12 cm.
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. 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 from a portion of 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 by a first sound pressure level at a first frequency, and reducing the sound pressure level of the leaked sound wave by a second sound pressure level at a second frequency, wherein
the first frequency is lower than the second frequency and the first sound pressure level is larger than the second sound pressure level.
13. The method of claim 12 , wherein:
the first frequency is in a range of 1300 Hz-3000 Hz; and
the second frequency is in a range of 3000 Hz-4000 Hz.
14. The method of claim 12 , wherein the first sound pressure level at the first frequency is larger than 10 dB.
15. The speaker of claim 12 , 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.
16. The speaker of claim 12 , wherein the at least one sound guiding hole is arranged on a wall of the housing different from a wall on which the portion of the housing is located.
17. The speaker of claim 12 , wherein the at least one sound guiding hole and the portion of the housing are located on a same side of a user's ear.
18. The speaker of claim 17 , wherein a sound path from the at least one sound guiding hole to the user's ear is larger than a sound path from the portion of the housing to the user's ear.
19. The speaker of claim 12 , wherein a ratio of a distance between the at least one sound guiding hole and a user's ear to a distance between the at least one sound guiding hole and the portion of the housing is less than or equal to 0.9.
20. The speaker of claim 19 , wherein the distance between the at least one sound guiding hole and the portion of the housing is less than or equal to 12 cm.