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 plurality of transducers residing inside the housing and a first portion of the plurality of transducers is 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;
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,
wherein a second portion of the plurality of transducers includes:
a first acoustic-electric transducer having a first frequency response and a second acoustic-electric transducer having a second frequency response, the second frequency response being different from the first frequency response, wherein
the first acoustic-electric transducer is configured to detect an audio signal, and generate a first sub-band signal according to the detected audio signal by the first acoustic-electric transducer; and
the second acoustic-electric transducer is configured to detect the audio signal, and generate a second sub-band signal according to the detected audio signal by the second acoustic-electric transducer.
2. The speaker of claim 1 , wherein the first acoustic-electric transducer has a first frequency width, and the second acoustic-electric transducer has a second frequency width different from the first frequency width.
3. The speaker of claim 2 , wherein the second frequency width is larger than the first frequency width, and a second center frequency of the second acoustic-electric transducer is higher than a first center frequency of the first acoustic-electric transducer.
4. The speaker of claim 2 , wherein the first frequency response and the second frequency response intersect at a point near a half-power point of the first frequency response and a half-power point of the second frequency response.
5. The speaker of claim 1 , further comprising:
a first sampling module connected to the first acoustic-electric transducer and configured to sample the first sub-band signal to generate a first sampled sub-band signal; and
a second sampling module connected to the second acoustic-electric transducer and configured to sample the second sub-band signal to generate a second sampled sub-band signal.
6. The speaker of claim 5 , further comprising a feedback module configured to adjust at least one of the first acoustic-electric transducer or the second acoustic-electric transducer.
7. The speaker of claim 6 , wherein the feedback module is configured to adjust the at least one of the first acoustic-electric transducer or the second acoustic-electric transducer according to at least one of the first sampled sub-band signal or the second sampled sub-band signal.
8. The speaker of claim 6 , further comprising a processing module configured to process the first sampled sub-band signal and the second sampled sub-band signal to generate a first processed sub-band signal and a second processed sub-band signal, respectively, wherein the feedback module is configured to adjust the at least one of the first acoustic-electric transducer or the second acoustic-electric transducer according to the first processed sub-band signal or the second processed sub-band signal.
9. The speaker of claim 1 , wherein the first acoustic-electric transducer includes:
a sound sensitive component configured to generate an electric signal according to the audio signal, and
an acoustic channel component.
10. The speaker of claim 9 , wherein:
the acoustic channel component includes a second-order component; and
the sound sensitive component includes a multi-order bandpass diaphragm.
11. The speaker of claim 1 , wherein the first acoustic-electric transducer includes a first-order bandpass filter or a multi-order bandpass filter.
12. The speaker of claim 1 , wherein the second portion of the plurality of transducers includes at least one of:
no more than 10 first-order acoustic-electric transducers, wherein each first-order acoustic-electric transducer corresponds to a frequency band whose width is no larger than 20 kHz;
no more than 20 second-order acoustic-electric transducers, wherein each second-order acoustic-electric transducer corresponds to a frequency band whose width is no larger than 20 kHz;
no more than 30 third-order acoustic-electric transducers, wherein each third-order acoustic-electric transducer corresponds to a frequency band whose width is no larger than 20 kHz; or
no more than 40 fourth-order acoustic-electric transducers, wherein each fourth-order acoustic-electric transducer corresponds to a frequency band whose width is no larger than 20 kHz.
13. The speaker of claim 1 , wherein the second portion of the plurality of transducers includes at least one of:
no more than 8 first-order acoustic-electric transducers, wherein each first-order acoustic-electric transducer corresponds to a frequency band whose width is no larger than 8 kHz;
no more than 13 second-order acoustic-electric transducers, wherein each second-order acoustic-electric transducer corresponds to a frequency band whose width is no larger than 8 kHz;
no more than 19 third-order acoustic-electric transducers, wherein each third-order acoustic-electric transducer corresponds to a frequency band whose width is no larger than 8 kHz; or
no more than 26 fourth-order acoustic-electric transducers, wherein each fourth-order acoustic-electric transducer corresponds to a frequency band whose width is no larger than 8 kHz.
14. The speaker of claim 1 , wherein the first acoustic-electric transducer is a high-order wideband acoustic-electric transducer, and the second acoustic-electric transducer is a high-order narrow-band acoustic-electric transducer.
15. The speaker of claim 14 , wherein the high-order wideband acoustic-electric transducer includes a plurality of underdamping sound sensitive components connected in parallel, and the high-order narrow-band acoustic-electric transducer includes a plurality of underdamping sound sensitive components connected in series.
16. The speaker of claim 15 , wherein the plurality of underdamping sound sensitive components include a first underdamping sound sensitive component having a fourth frequency response, a second underdamping sound sensitive component having a fifth frequency response, and a third underdamping sound sensitive component having a sixth frequency response, wherein:
a fifth center frequency of the second underdamping sound sensitive component is higher than a fourth center frequency of the first underdamping sound sensitive, and a sixth center frequency of the third underdamping sound sensitive component is higher than the fifth center frequency of the second underdamping sound sensitive, and
the fourth frequency response and the fifth frequency response intersect at a point near a half-power point of the fourth frequency response and a half-power point of the fifth frequency response.
17. The speaker of claim 15 , wherein the plurality of underdamping sound sensitive components include a first underdamping sound sensitive component having a fourth frequency response, and a second underdamping sound sensitive component having a fifth frequency response, wherein:
the fourth frequency response and the fifth frequency response intersect at a point near a half-power point of the fourth frequency response and a half-power point of the fifth frequency response.
18. 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.
19. The speaker of claim 18 , 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.
20. The speaker of claim 1 , wherein the guided sound wave includes at least two sound waves having different phases.