Transmit-receive switching in wireless hearing aids
First Claim
1. An apparatus for use within a communication system having an antenna circuit with an inductive coil and a tuning capacitor connected to the inductive coil at a node, wherein the communication system further includes an amplifier connected to the node through a DC blocking capacitor to receive an induced signal in the inductive coil in a receive mode, and a driver connected to the antenna circuit to energize the inductive coil with a driven signal in a transmit mode, the apparatus comprising:
- means to transform the inductive coil, the tuning capacitor and the DC blocking capacitor into a series resonant circuit to reduce an inductive load in the transmit mode; and
means to transform the inductive coil, the tuning capacitor and the DC blocking capacitor into a parallel resonant circuit to increase an inductive load in the receive mode.
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Accused Products
Abstract
Systems, devices and methods are provided to switch between transmit and receive modes in wireless hearing aids. One aspect relates to an apparatus for use within a communication system that has an inductive coil connected to a tuning capacitor at a node. An amplifier is connected to the node through a DC blocking capacitor to receive an induced signal in the inductive coil in a receive mode. A driver energizes the inductive coil with a driven signal in a transmit mode. According to various embodiments, the apparatus transforms the inductive coil, the tuning capacitor and the DC blocking capacitor into an equivalent series resonant circuit to reduce an inductive load in the transmit mode, and transforms the inductive coil, the tuning capacitor and the DC blocking capacitor into an equivalent parallel resonant circuit to increase an inductive load in the receive mode.
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Citations
26 Claims
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1. An apparatus for use within a communication system having an antenna circuit with an inductive coil and a tuning capacitor connected to the inductive coil at a node, wherein the communication system further includes an amplifier connected to the node through a DC blocking capacitor to receive an induced signal in the inductive coil in a receive mode, and a driver connected to the antenna circuit to energize the inductive coil with a driven signal in a transmit mode, the apparatus comprising:
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means to transform the inductive coil, the tuning capacitor and the DC blocking capacitor into a series resonant circuit to reduce an inductive load in the transmit mode; and means to transform the inductive coil, the tuning capacitor and the DC blocking capacitor into a parallel resonant circuit to increase an inductive load in the receive mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for use within a communication system having an antenna circuit with a first terminal, a second terminal, a node, an inductive coil connected between the first terminal and the node, and a tuning capacitor connected between the second terminal and the node, the communication system further including an amplifier connected to the node through a DC blocking capacitor to receive an induced signal in the inductive coil in a receive mode, and a driver connected to the antenna circuit to energize the inductive coil with a driven signal in a transmit mode, the apparatus comprising:
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a first switch to; connect the first terminal and the second terminal of the antenna circuit to a reference potential in the receive mode such that the inductive coil is connected in parallel across the tuning capacitor; and connect the antenna circuit to the driver in the transmit mode; and a second switch connected to a node between the DC blocking capacitor and the amplifier to shunt an integrated circuit (IC) capacitance in the transmit mode to protect the amplifier from high voltages generated at the node in the transmit mode. - View Dependent Claims (8, 9)
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10. A communication system, comprising:
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an antenna element having a first terminal, a second terminal and a node, the antenna element including an inductive coil connected between the first terminal and the node and a tuning capacitor connected between the second terminal and the node; a DC blocking capacitor connected to the node of the antenna element; integrated circuitry, including; an amplifier connected to the node of the antenna through the DC blocking capacitor to receive a first communication signal induced in the inductive coil in a receive mode; a driver to energize the inductive coil with a second communication signal in a transmit mode; and a transmit-receive switch (TR switch) responsive to a control signal to; pull the first and second terminals of the antenna element to a reference potential during the receive mode; and operably connect the driver to at least one of the first and second terminals of the antenna element, and energize the inductive coil during the transmit mode. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A hearing aid, comprising:
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a hearing aid receiver to present sound to an ear; a microphone system to receive acoustic signals; an antenna element to transmit and receive inductive signals, the antenna element including; a first terminal, a second terminal and a node; an inductive coil connected between the first terminal and the node; and a tuning capacitor connected between the second terminal and the node; a DC blocking capacitor connected to the node of the antenna element; and signal processing circuitry connected to the microphone system to process received acoustic signals and present the processed signals to the hearing aid receiver, and connected to the antenna element to process the received inductive signals, the signal processing circuitry including a transmit-receive switch responsive to a control signal to configure the antenna element in a parallel resonant circuit in a receive mode, and to configure the antenna element in a series resonant circuit in a transmit mode. - View Dependent Claims (17, 18)
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19. A method for switching between a transmit mode and a receive mode in a wireless communication system having a single antenna element with a single resonant circuit and a DC blocking capacitor connected between an amplifier and a node of the antenna element, the method comprising:
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determining a mode of operation for the communication system; transforming the single resonant circuit of the antenna element into a high-impedance parallel resonant circuit in a receive mode; and transforming the single resonant circuit of the antenna element into a low-impedance series resonant circuit in a transmit mode. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification