Systems devices, components and methods for providing acoustic isolation between microphones and transducers in bone conduction magnetic hearing aids
Disclosed are various embodiments of systems, devices, components and methods for reducing feedback between a transducer and a microphone in a magnetic bone conduction hearing aid. Such systems, devices, components and methods include providing encapsulation compartments for the transducer and/or the microphone, and providing an acoustically-isolating housing for the microphone that is separate and apart from the main housing of the hearing aid.
1. A bone conduction magnetic hearing aid, comprising:
an electromagnetic (“EM”) transducer configured to generate sound waves, the EM transducer being disposed in a first housing;
at least one microphone disposed in, on or near the first housing, the at least one microphone being configured to detect external ambient sounds in a vicinity of the hearing aid, the EM transducer being configured to generate the sound waves in response to the external ambient sounds detected by the at least one microphone, and
a transducer encapsulation second housing or compartment disposed inside the first the second housing or compartment being disposed around at least portions of the EM transducer, the second housing or compartment being configured to block, absorb or attenuate sound waves generated by the EM transducer that propagate in the direction of the at least one microphone, the second housing or compartment having portions disposed directly between the at least one microphone and the transducer;
wherein the second housing or compartment is configured to reduce or minimize undesired feedback between the EM transducer and the at least one microphone, the second transducer encapsulation housing or compartment comprises inner and outer transducer encapsulation compartments having a volume disposed therebetween, and the volume is filled or partially filled with at least one sound attenuating or absorbing material, liquid, gas or gel, or has been evacuated of gas or air.
2. The hearing aid of claim 1 , wherein the second transducer encapsulation housing or compartment comprises or is formed of one or more of a poro-elastic material, a porous material, a foam, a polyurethane foam, polymer microparticles, an inorganic polymeric foam, a polyurethane foam, a smart foam, a cellular porous sound absorbing material, cellular melamine, a granular porous sound absorbing material, a fibrous porous sound absorbing material, a closed-cell metal foam, a metal foam, a gel, and an aerogel.
3. The hearing aid of claim 1 , wherein the second transducer encapsulation housing or compartment comprises one of a flexural sound absorbing material and a resonant sound absorbing material configured to dampen or reflect sound waves incident thereon.
4. The hearing aid of claim 1 , wherein the second transducer encapsulation housing or compartment is dimensioned, configured and formed of appropriate materials such that such the transducer encapsulation compartment is tuned to resonate at peak frequencies associated with noise generated by the transducer.
5. The hearing aid of claim 1 , wherein the at least one microphone is surrounded by at least a third microphone encapsulation housing or compartment.
6. The hearing aid of claim 5 , wherein the third microphone encapsulation housing or compartment further comprises at least one of a sound attenuating or absorbing material, a flexural sound absorbing material, and a resonant sound absorbing material.
7. The hearing aid of claim 5 , wherein the third microphone encapsulation housing or compartment comprises inner and outer microphone encapsulation compartments having a volume disposed therebetween.
8. The hearing aid of claim 7 , wherein the volume is filled or partially filled with at least one sound attenuating or absorbing material, liquid, gas or gel, or has been evacuated of gas or air.
9. The hearing aid of claim 5 , wherein the third microphone encapsulation compartment is dimensioned, configured and formed of appropriate materials such that such the microphone encapsulation compartment is tuned to resonate at peak frequencies associated with noise generated by the transducer.
10. The hearing aid of claim 1 , wherein the at least one microphone is potted in or surrounded by a sound attenuating or absorbing material.
11. The hearing aid of claim 1 , wherein the at least one microphone is a directional microphone.
12. The hearing aid of claim 1 , wherein one or more noise cancellation microphones are provided inside the hearing aid.
13. The hearing aid of claim 1 , further comprising a sealing membrane disposed between a disk and the EM transducer, the disk being operably connected to a magnetic spacer disposed therebeneath.
14. A bone conduction magnetic hearing aid, comprising:
an electromagnetic (“EM”) transducer configured to generate sound waves, the EM transducer being disposed in a first housing;
at least one microphone disposed in, on or near the first housing, at least one the microphone being configured to detect ambient sounds in a vicinity of the hearing aid, the EM transducer being configured to generate the sound waves in response to the external ambient sounds detected by the at least one microphone, and
a microphone encapsulation second housing or compartment disposed around at least portions of the at least one microphone, the second housing or compartment being configured to block, absorb or attenuate sound waves generated by the EM transducer that propagate in the direction of the at least one microphone, the second housing or compartment having portions disposed directly between the transducer and the at least one microphone;
wherein the second housing or compartment is configured to reduce or minimize undesired feedback between the EM transducer and the at least one microphone, the microphone encapsulation second housing or compartment comprises inner and outer microphone encapsulation compartments having a volume disposed therebetween, and the volume is filled or partially filled with at least one sound attenuating or absorbing material, liquid, gas or gel, or has been evacuated of gas or air.
15. The hearing aid of claim 14 , wherein the microphone encapsulation second housing or compartment comprises or is formed of one or more of a poro-elastic material, a porous material, a foam, a polyurethane foam, polymer microparticles, an inorganic polymeric foam, a polyurethane foam, a smart foam, a cellular porous sound absorbing material, cellular melamine, a granular porous sound absorbing material, a fibrous porous sound absorbing material, a closed-cell metal foam, a metal foam, a gel, and an aerogel.
16. The hearing aid of claim 14 , wherein the microphone encapsulation second housing or compartment comprises one of a flexural sound absorbing material and a resonant sound absorbing material configured to dampen or reflect sound waves incident thereon.
17. The hearing aid of claim 14 , wherein the microphone encapsulation second housing or compartment is dimensioned, configured and formed of appropriate materials such that such the microphone encapsulation compartment is tuned to resonate at peak frequencies associated with noise generated by the transducer.
18. The hearing aid of claim 14 , wherein the at least one microphone is a directional microphone.
19. The hearing aid of claim 14 , further comprising a sealing membrane disposed between a disk and the EM transducer, the disk being operably connected to a magnetic spacer disposed therebeneath.
20. A method of reducing feedback between an electromagnetic (“EM”) transducer and at least one microphone in a bone conduction magnetic hearing aid, the EM transducer being configured to generate sound waves, the EM transducer being disposed in a first housing, the at least one microphone being disposed in, on or near the first housing, the at least one microphone being configured to detect external ambient sounds in a vicinity of the hearing aid, the EM transducer being configured to generate the sound waves in response to the external ambient sounds detected by the at least one microphone, a transducer encapsulation second housing or compartment being disposed inside the first housing, the second housing or compartment being disposed around at least portions of the EM transducer, the second housing or compartment being configured to block, absorb or attenuate sound waves generated by the EM transducer that propagate in the direction of the at least one microphone, the second housing or compartment having portions disposed directly between the at least one microphone and the transducer, wherein the second housing or compartment is configured to reduce or minimize undesired feedback between the EM transducer and the microphone, the second transducer encapsulation housing or compartment comprises inner and outer transducer encapsulation compartments having a volume disposed therebetween, and the volume is filled or partially filled with at least one sound attenuating or absorbing material, liquid, gas or gel, or has been evacuated of gas or air, the method comprising:
providing the transducer encapsulation second housing or compartment in the hearing aid.
21. A method of reducing feedback between an electromagnetic (“EM”) transducer and at least one microphone in a bone conduction magnetic hearing aid, the electromagnetic (“EM”) transducer being configured to generate sound waves, the EM transducer being disposed in a first housing, the at least one microphone being disposed in, on or near the first housing, the at least one microphone being configured to detect ambient sounds in a vicinity of the hearing aid, the EM transducer being configured to generate the sound waves in response to the external ambient sounds detected by the at least one microphone, and a microphone encapsulation second housing or compartment disposed around at least portions of the at least one microphone, the second housing or compartment being configured to block, absorb or attenuate sound waves generated by the EM transducer that propagate in the direction of the at least one microphone, the second housing or compartment having portions disposed directly between the transducer and the at least one microphone, wherein the second housing or compartment is configured to reduce or minimize undesired feedback between the EM transducer and the microphone, the microphone encapsulation second housing or compartment comprises inner and outer microphone encapsulation compartments having a volume disposed therebetween, and the volume is filled or partially filled with at least one sound attenuating or absorbing material, liquid, gas or gel, or has been evacuated of gas or air, the method comprising:
providing the microphone encapsulation second housing or compartment in the hearing aid.