Radio frequency shielding for receivers within hearing aids and listening devices
First Claim
1. A receiver for a listening device, comprising:
- audio signal processing circuitry configured to convert an audio signal into an acoustic signal;
a housing enclosing said audio signal processing circuitry; and
an electrically conductive shield surrounding a substantial portion of said housing, said electrically conductive shield electrically connected to said audio signal processing circuitry for suppressing electromagnetic emissions from said receiver in a passive manner.
6 Assignments
0 Petitions
Accused Products
Abstract
Method and apparatus are disclosed for reducing or eliminating the interference produced by a receiver in a listening device, such as a hearing aid. The method and apparatus of the invention involves placing an electrically conductive shield around the receiver. Such a shield helps suppress the electromagnetic signals emitted by the receiver, thereby reducing or eliminating the interference from the receiver. The shield is a passive shield and may be one or more wires that are wound around the receiver and shorted together, or it may be an electrically conductive mesh, jacket, sleeve, or the like, that is placed around the receiver. The shield is then connected either to one of the input terminals of the receiver, or to a system ground of the receiver.
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Citations
21 Claims
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1. A receiver for a listening device, comprising:
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audio signal processing circuitry configured to convert an audio signal into an acoustic signal;
a housing enclosing said audio signal processing circuitry; and
an electrically conductive shield surrounding a substantial portion of said housing, said electrically conductive shield electrically connected to said audio signal processing circuitry for suppressing electromagnetic emissions from said receiver in a passive manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of suppressing electromagnetic emissions from a receiver in a listening device, comprising:
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forming an electrically conductive shield around a substantial portion of said receiver; and
electrically connecting said electrically conductive shield to audio signal processing circuitry within said receiver;
wherein said electrically conductive shield suppresses said electromagnetic emissions in a passive manner. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An electromagnetic shield for a receiver in a listening device, comprising:
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at least one electrically conductive wire wound into a coil substantially surrounding said receiver; and
means for forming said coil into a closed electrical loop, said coil having substantially no current supplied thereto. - View Dependent Claims (20)
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21. A receiver for a listening device, comprising:
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a switching amplifier;
audio signal processing circuitry connected to said switching amplifier and configured to convert an audio signal into an acoustic signal;
a housing enclosing said audio signal processing circuitry and said switching amplifier; and
an electrically conductive coil surrounding a substantial portion of said housing for suppressing electromagnetic emissions from said switching amplifier in a passive manner, said electrically conductive coil forming a closed electrical circuit and electrically connected to a system ground of said audio signal processing circuitry, said electrically conductive coil having a predetermined number of turns based on a frequency of said electromagnetic emissions to be suppressed.
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Specification