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 from a portion of the housing, the transducer including a magnetic system for generating a first magnetic field, wherein the magnetic system includes
a first magnetic component for generating a second magnetic field;
at least one second magnetic component surrounding the first magnetic component, wherein a magnetic gap is formed between the first magnetic component and the at least one second magnetic component, and a magnetic field intensity of the first magnetic field in the magnetic gap is greater than that of the second magnetic field in the magnetic gap;
a first magnetic conductive component mechanically connected to a first surface of the first magnetic component; and
a second magnetic conductive component mechanically connected to a second surface of the first magnetic component; 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.
2. The speaker of claim 1 , wherein the second surface is opposite to the first surface of the first magnetic component.
3. The speaker of claim 2 , wherein the magnetic system further comprises:
at least one third magnetic component, wherein the at least one third magnetic component is mechanically connected to each of the second magnetic conductive component and the at least one second magnetic component.
4. The speaker of claim 3 , wherein the magnetic system further comprises at least one fourth magnetic component placed within the magnetic gap and mechanically connected to each of the first magnetic component and the second magnetic conductive component.
5. The speaker of claim 3 , wherein the magnetic system further comprises at least one electric conductive component mechanically connected to at least one of the first magnetic component, the first magnetic conductive component, or the second magnetic conductive component.
6. The speaker of claim 1 , wherein the magnetic system further comprises at least one of fifth magnetic component mechanically connected to the first magnetic conductive component, wherein the at least one fifth magnetic component and the first magnetic component are located at opposite sides of the first magnetic conductive component.
7. The speaker of claim 6 , wherein the magnetic system further comprises a third magnetic conductive component for suppressing a magnetic field leakage of the first magnetic field, wherein
the third magnetic conductive component is mechanically connected to the fifth magnetic component, and
the third magnetic conductive component and the first magnetic conductive component are located at opposite sides of the fifth magnetic component.
8. The speaker of claim 1 , wherein
the housing includes a bottom or a sidewall; and
the portion of the housing includes the bottom or the sidewall of the housing.
9. The speaker 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.
10. The speaker of claim 9 , wherein the damping layer includes tuning paper, tuning cotton, nonwoven fabric, silk, cotton, sponge, or rubber.
11. The speaker of claim 1 , wherein the guided sound wave includes at least two sound waves having different phases.
12. The speaker of claim 11 , wherein the at least one sound guiding hole includes two sound guiding holes located on the housing.
13. The speaker of claim 12 , 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.
14. The speaker 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 speaker 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 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, the transducer including a magnetic system for generating a first magnetic field, wherein the magnetic system includes
a first magnetic component for generating a second magnetic field;
at least one second magnetic component surrounding the first magnetic component, wherein a magnetic gap is formed between the first magnetic component and the at least one second magnetic component, and a magnetic field intensity of the first magnetic field in the magnetic gap is greater than that of the second magnetic field in the magnetic gap;
a first magnetic conductive component mechanically connected to a first surface of the first magnetic component; and
a second magnetic conductive component mechanically connected to a second surface of the first magnetic component; 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.
17. The method of claim 16 , wherein the second surface is opposite to the first surface of the first magnetic component.
18. The method of claim 17 , wherein the magnetic system further comprises:
at least one third magnetic component, wherein the at least one third magnetic component is mechanically connected to each of the second magnetic conductive component and the at least one second magnetic component.
19. The method of claim 18 , wherein the magnetic system further comprises at least one fourth magnetic component placed within the magnetic gap and mechanically connected to each of the first magnetic component and the second magnetic conductive component.
20. The method of claim 18 , wherein the magnetic system further comprises at least one electric conductive component mechanically connected to at least one of the first magnetic component, the first magnetic conductive component, or the second magnetic conductive component.