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, the transducer including a magnetic system, wherein the magnetic system includes
a first magnetic component that has a first magnetization direction;
a second magnetic component that has a second magnetization direction; and
a first magnetic conductive component disposed between the first magnetic component and the second 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, 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.
2 . The speaker of claim 1 , wherein an angle between the second magnetization direction of the second magnetic component and the first magnetization direction of the first magnetic component is in a range from 90 degrees to 180 degrees.
3 . The speaker of claim 2 , wherein the second magnetization direction of the second magnetic component is opposite to the first magnetization direction of the first magnetic component.
4 . The speaker of claim 1 , wherein the first magnetic conductive component is mechanically connected to an upper surface of the first magnetic component.
5 . The speaker of claim 4 , wherein the first magnetic conductive component is mechanically connected to a lower surface of the second magnetic component.
6 . The speaker of claim 4 , wherein the first magnetic component, the first magnetic conductive component, or the second magnetic component have an axisymmetric structure.
7 . The speaker of claim 4 , wherein the magnetic system further comprises:
a second magnetic conductive component mechanically connected to a lower surface of the first magnetic component, the lower surface being opposite to the upper surface of the first magnetic component.
8 . The speaker of claim 7 , wherein a magnetic gap is formed between the first magnetic component, the first magnetic conductive component, the second magnetic component, and a sidewall of the second magnetic conductive component.
9 . The speaker of claim 8 , wherein a voice coil is disposed in the magnetic gap.
10 . The speaker of claim 9 , wherein the first magnetic component, the first magnetic conductive component, the second magnetic conductive component, and the second magnetic component form a magnetic field loop.
11 . The speaker of claim 8 , wherein the magnetic system generates a first magnetic field, and the first magnetic component generates a second magnetic field.
12 . The speaker of claim 11 , wherein an intensity of the first magnetic field in the magnetic gap is greater than an intensity of the second magnetic field in the magnetic gap.
13 . The speaker of claim 12 , wherein the second magnetic component generates a third magnetic field, the third magnetic field increasing an intensity of the second magnetic field in the magnetic gap.
14 . 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.
15 . The speaker of claim 1 , wherein the guided sound wave includes at least two sound waves having different phases.
16 . The speaker of claim 15 , wherein the at least one sound guiding hole includes two sound guiding holes located on the housing.
17 . The speaker of claim 16 , 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.
18 . 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.
19 . The speaker of claim 18 , 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.
20 . The speaker of claim 15 , wherein different portions of the at least one sound guiding hole are configured to generate the at least two sound waves having different phases.