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 first side of the housing, the second sound guiding hole is located on a second side different from the first side where the first sound guiding hole is located, and the guided sound wave through the first sound guiding hole and the guided sound wave through the second sound guiding hole have same amplitude and opposite phases;
wherein the second side where the second sound guiding hole is located is connected to the first side where the first sound guiding hole is located;
when in a wearing state, the first sound guiding hole and the second sound guiding hole are configured to simultaneously transmit sound to surrounding environment and an ear canal of a user.
2 . The speaker of claim 1 , wherein the first sound guiding hole includes a perforative hole with at least one damping layer, the at least one damping layer is configured to adjust at least one of a phase and an amplitude of the guided sound wave passing through the perforative hole.
3 . The speaker of claim 2 , wherein the at least one 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.
4 . The speaker of claim 1 , wherein the second sound guiding hole includes one or more damping layers.
5 . The speaker of claim 1 , wherein the first sound guiding hole is located on a lower portion of the first side, the lower portion of the first side ranges from ⅔ height of the first side to a connection between the first side and the second side.
6 . The speaker of claim 1 , further comprising:
an acoustic route coupled to the second sound guiding hole, wherein the guided sound wave of the second sound guiding hole is propagated to the second sound guiding hole along the acoustic route, and the acoustic route is configured to adjust a frequency of the guided sound wave of the second sound guiding hole.
7 . The speaker of claim 6 , wherein the acoustic route is configured to adjust a frequency of the guided sound wave by filtering sound waves in target frequencies.
8 . The speaker of claim 6 , wherein the acoustic route includes one or more lumen structures.
9 . The speaker of claim 6 , wherein the acoustic route includes one or more resonance cavities.
10 . The speaker of claim 1 , wherein the guided sound wave through the first sound guiding hole to the outside and the guided sound wave through the second sound guiding hole to the outside interfere with each to reduce a sound pressure level of a leaked sound wave.
11 . The speaker of claim 10 , 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 speaker 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 speaker of claim 10 , 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 speaker 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 method, comprising:
providing a speaker, the 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 first side of the housing, the second sound guiding hole is located on a second side different from the first side where the first sound guiding hole is located, and the guided sound wave through the first sound guiding hole and the guided sound wave through the second sound guiding hole have same amplitude and opposite phases;
wherein the second side where the second sound guiding hole is located is connected to the first side where the first sound guiding hole is located;
when in a wearing state, the first sound guiding hole and the second sound guiding hole are configured to simultaneously transmit sound to surrounding environment and an ear canal of a user.
16 . The method of claim 15 , wherein the first sound guiding hole is located on a lower portion of the first side, the lower portion of the first side ranges from ⅔ height of the first side to a connection between the first side and the second side.
17 . The method of claim 15 , wherein the first sound guiding hole includes a damping layer, the damping layer being configured to adjust the phase of the guided sound wave through the first sound guiding hole.
18 . The method of claim 15 , wherein the guided sound wave through the first sound guiding hole to the outside and the guided sound wave through the second sound guiding hole to the outside interfere with each to reduce a sound pressure level of a leaked sound wave.