Switching structures for hearing aid
First Claim
1. A hearing aid adapted to be worn by a wearer, comprising:
- an input system including;
an acoustic input, such as a microphone; and
a solid state magnetic transducer adapted to detect a magnetic field strength and information modulated on a time varying magnetic field emanating from a source external to the hearing aid;
an acoustic output system;
a signal processing circuit connected to the input system and the output system, the signal processing circuit adapted to process signals from the input system and to present processed signals to the output system; and
a switch circuit adapted to switch the input system from the acoustic input to the solid state magnetic transducer when the magnetic field strength detected is above a threshold, the switch circuit comprising filters to remove a high frequency component from a signal from the solid state magnetic transducer to prevent false triggering of the switch circuit, and adapted to provide a signal including the information modulated on the time varying magnetic field to the signal processing circuit, andwherein the solid state magnetic transducer provides a compact input system for the hearing aid.
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Accused Products
Abstract
An apparatus is provided that includes an input system, an output system, and a sensor for sensing magnetic fields. In one example, a signal processing circuit electrically connects the input system to the output system, and a magnetic sensor adapted to inhibit the acoustic input and function as a magnetic input in the presence of a magnetic field. In one example, the magnetic sensor includes a giant magneto resistive (GMR) sensor. In another example, the magnetic sensor includes an anisotropic magneto resistive (AMR) sensor. The magnetic field can be generated by, among other things, a magnet in a telephone handset. The hearing aid further is programmed based on time-varying characteristics of the magnetic field. Wireless activation or deactivation of the hearing aid is also described. Other examples and options are provided herein.
189 Citations
22 Claims
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1. A hearing aid adapted to be worn by a wearer, comprising:
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an input system including; an acoustic input, such as a microphone; and a solid state magnetic transducer adapted to detect a magnetic field strength and information modulated on a time varying magnetic field emanating from a source external to the hearing aid; an acoustic output system; a signal processing circuit connected to the input system and the output system, the signal processing circuit adapted to process signals from the input system and to present processed signals to the output system; and a switch circuit adapted to switch the input system from the acoustic input to the solid state magnetic transducer when the magnetic field strength detected is above a threshold, the switch circuit comprising filters to remove a high frequency component from a signal from the solid state magnetic transducer to prevent false triggering of the switch circuit, and adapted to provide a signal including the information modulated on the time varying magnetic field to the signal processing circuit, and wherein the solid state magnetic transducer provides a compact input system for the hearing aid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of operating a hearing assistance device, comprising:
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selecting between an acoustic input and a solid state magnetic transducer input using a signal from the solid state magnetic transducer; filtering a high frequency component of the signal to prevent false selection of the solid state magnetic transducer; converting a modulated magnetic signal produced from a source external to the hearing assistance device to an electrical signal using the solid state magnetic transducer in the hearing assistance device; processing the electrical signal to produce a processed electrical signal; and producing an acoustic signal for output by a speaker of the hearing assistance device using the processed electrical signal. - View Dependent Claims (19, 20, 21, 22)
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Specification