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
at least two sound guiding holes located on the housing and configured to guide the sound wave inside the housing through the at least two sound guiding holes to an outside of the housing, wherein
the at least two sound guiding holes include a first sound guiding hole and a second sound guiding hole, the first sound guiding hole is located on a contact surface of the speaker, the contact surface having a gradient structure and being in contact with a skin of a user, and the second sound guiding hole is located on a side wall of the housing that is different from the contact surface, and the guided sound waves of the first sound guiding hole and the second sound guiding hole have different phases but substantially same amplitude.
2 . The speaker of claim 1 , wherein the gradient structure is located at an edge or center of the contact surface.
3 . The speaker of claim 1 , wherein the housing includes a specific side wall where no sound guiding hole is located, and a distance from the first sound guiding hole to the specific side wall of the housing is different from a distance from the second sound guiding hole to the specific side wall of the housing.
4 . The speaker of claim 1 , wherein the guided sound waves of the first sound guiding hole and the second sound guiding hole have substantially opposite phases.
5 . The speaker of claim 1 , wherein the guided sound waves of the first sound guiding hole and the second sound guiding hole interfere with each other to reduce a sound pressure level of a leaked sound wave of the speaker.
6 . The speaker of claim 5 , 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.
7 . The speaker of claim 6 , 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.
8 . The speaker of claim 5 , 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.
9 . The speaker of claim 8 , 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.
10 . The speaker of claim 1 , wherein the first sound guiding hole or the second sound guiding hole includes a damping layer, the damping layer being configured to adjust the amplitude of the guided sound wave of the first sound guiding hole or the second sound guiding hole.
11 . The speaker of claim 10 , 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.
12 . The speaker of claim 1 , wherein a shape of the first sound guiding hole or the second sound guiding hole includes circle, ellipse, quadrangle, rectangle, or linear.
13 . The speaker of claim 1 , wherein the speaker further includes:
at least one acoustic route coupled to at least one sound guiding hole of the at least two sound guiding holes, wherein a guided sound wave of the at least one sound guiding hole is propagated to the at least one sound guiding hole along the acoustic route, and the at least one acoustic route is configured to adjust a frequency of the guided sound wave.
14 . The speaker of claim 13 , wherein the acoustic route is configured to adjust a frequency of the guided sound wave by filtering sound waves in target frequencies.
15 . The speaker of claim 13 , wherein the acoustic route includes one or more lumen structures.
16 . The speaker of claim 13 , wherein the acoustic route includes one or more resonance cavities.
17 . 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
at least two sound guiding holes located on the housing and configured to guide the sound wave inside the housing through the at least two sound guiding holes to an outside of the housing, wherein
the at least two sound guiding holes include a first sound guiding hole and a second sound guiding hole, the first sound guiding hole is located on a contact surface of the speaker, the contact surface having a gradient structure and being in contact with a skin of a user, and the second sound guiding hole is located on a side wall of the housing that is different from the contact surface, and the guided sound waves of the first sound guiding hole and the second sound guiding hole have different phases but substantially same amplitude.
18 . The method of claim 17 , wherein the gradient structure is located at an edge or center of the contact surface.
19 . The method of claim 17 , wherein the guided sound waves of the first sound guiding hole and the second sound guiding hole have substantially opposite phases.
20 . The method of claim 17 , wherein the guided sound waves of the first sound guiding hole and the second sound guiding hole interfere with each other to reduce a sound pressure level of a leaked sound wave of the speaker.