Abstract: An active electrode has an electrode for sensing an electric potential and generating an input signal, and a shield placed near the electrode but being electric insulated from the electrode. An integrated amplifier (10) has an input connected to the at least one electrode for receiving the input signal, and providing a buffered path outputting a buffered output signal. The shield being connected to the output of the integrated amplifier to actively drive the electrical potential of the shield, thereby providing an active shielding of the electrode. The buffered path includes a first mixer (11) in front of the integrated amplifier for frequency shifting the input signal from a basic frequency range to a higher frequency range, and a second mixer (12) on the output of the integrated amplifier for frequency shifting the amplified signal from the higher frequency range back to the basic frequency range. The active electrode may be used for recording EEG signals.

Abstract: A wearable EEG monitor for continuously monitoring the EEG of a user through capacitive coupling to an ear canal of a user includes an ear insert (1) for positioning within the human ear canal, having at least two capacitive electrodes (16) for recording a signal. The electrodes are coated with a dielectricum for electrical insulation. The electrodes are connected to an amplifier (17). The amplifier has an input impedance matched to the impedance of the electrodes. The invention further provides a method of monitoring brain waves.

Abstract: A personal wearable EEG monitor comprising an implantable electrode part with at least two electrodes (2,3) for measuring an EEG signal of a person. The electrode part comprises an electronic circuit arranged in a housing (1) with each electrode arranged external to the housing. The electrode part comprises a testing circuit for testing functionality of the electrode part. The testing circuit comprises a capacitor (9) coupled in serial connection to at least one of the electrodes, and a test signal generator for providing a test signal. The EEG monitor is adapted for analyzing the signal resulting from the signal generator for identification of faults in the electrode part. The invention further provides a method for detecting a leak current in an implanted EEG monitor part.

Abstract: A wearable EEG monitor for continuously monitoring the EEG of a user through capacitive coupling to an ear canal of a user includes an ear insert (1) for positioning within the human ear canal, having at least two capacitive electrodes (16) for recording a signal. The electrodes are coated with a dielectricum for electrical insulation. The electrodes are connected to an amplifier (17). The amplifier has an input impedance matched to the impedance of the electrodes. The invention further provides a method of monitoring brain waves.

Abstract: A wearable EEG monitor for continuously monitoring the EEG of a user through capacitive coupling to an ear canal of a user comprises an ear insert (1) for positioning within the human ear canal, comprising at least two capacitive electrodes (16) for recording a signal. The electrodes are coated with a dielectricum for electrical insulation. The electrodes are connected to an amplifier (17). The amplifier has an input impedance matched to the impedance of the electrodes. The invention further provides a method of monitoring brain waves.

Abstract: A personal wearable EEG monitor comprises a base part (1) having signal processing means (23), and an electrode part (2) with at least two electrodes (11, 12) for measuring an EEG signal of a person. The electrode part (2) comprises means for converting the EEG signal into a digital signal. The EEG monitor comprises a databus for transferring data between the base part (1) and the electrode part (2) and for providing power from one part to the other. The databus is adapted for application of two electrical wires. The invention further provides a method for communicating between two parts of an EEG monitor.

Abstract: An active electrode has an electrode for sensing an electric potential and generating an input signal, and a shield placed near the electrode but being electric insulated from the electrode. An integrated amplifier (10) has an input connected to the at least one electrode for receiving the input signal, and providing a buffered path outputting a buffered output signal. The shield being connected to the output of the integrated amplifier to actively drive the electrical potential of the shield, thereby providing an active shielding of the electrode. The buffered path includes a first mixer (11) in front of the integrated amplifier for frequency shifting the input signal from a basic frequency range to a higher frequency range, and a second mixer (12) on the output of the integrated amplifier for frequency shifting the amplified signal from the higher frequency range back to the basic frequency range. The active electrode may be used for recording EEG signals.

Abstract: A personal wearable monitor for monitoring a bio-electrical signal from a person. The monitor is adapted for detecting an upcoming seizure, and for providing an acoustical information signal. The monitor is provided with a first speaker (13) for providing the information signal, and a second speaker (14) is adapted for functioning as a microphone in testing if said first speaker is capable of providing a sound. The second speaker is also a back-up speaker. The monitor is adapted for providing a notification in the event that the second speaker (14) does not detect the generated sound from the first speaker (13).

Abstract: In a monitoring device including a reader and a data carrier, the data carrier includes a receiver coil (201), a resonator capacitor (202), rectifier means (203), a modulation capacitor (206), an energy storage capacitor (204), three modulation switches (209, 210, 211) and data processing means. The modulation capacitor (206), the energy storage capacitor (204), the data processing means and the three modulation switches (209, 210, 211) are arranged such that, in a first configuration, the modulation capacitor (206) and the energy storage capacitor (204) are coupled in parallel and, in a second configuration, the modulation capacitor (206) and the energy storage capacitor (204) are coupled in series. The invention further provides a method of operating a data carrier in such a monitoring device.

Abstract: A personal wearable EEG monitor comprising an implantable electrode part with at least two electrodes (2,3) for measuring an EEG signal of a person. The electrode part comprises an electronic circuit arranged in a housing (1) with each electrode arranged external to the housing. The electrode part comprises a testing circuit for testing functionality of the electrode part. The testing circuit comprises a capacitor (9) coupled in serial connection to at least one of the electrodes, and a test signal generator for providing a test signal. The EEG monitor is adapted for analyzing the signal resulting from the signal generator for identification of faults in the electrode part. The invention further provides a method for detecting a leak current in an implanted EEG monitor part.

Abstract: A hearing aid comprising a wireless transceiver (100) having an inductive antenna (101) and a trimming capacitor (104, 105, 300, 404) with at least two parallel signal paths, wherein at least one of said signal paths comprises a first capacitor (309, 310, 311, 312), a second capacitor (301, 302, 303, 304) and a switching transistor (305, 306, 307, 308) arranged such that the switching transistor (305, 306, 307, 308) is coupled in parallel with said first capacitor (309, 310, 311, 312) and coupled in series with said second capacitor (301, 302, 303, 304), whereby the voltage drop across the switching transistor (305, 306, 307, 308), when the switching transistor is set to off, will be lower than the voltage applied across the trimming capacitor (104, 105, 300, 404) due to voltage division between said first capacitor (309, 310, 311, 312) and said second capacitor (301, 302, 303, 304). The invention also provides a method of fitting a wireless transceiver (100) for a hearing aid.

Abstract: In a monitoring device consisting of a reader and a data carrier, the reader (100) comprises a control unit (101), a memory (102), a digital signal generator (103), an output driver (104), resonance capacitors (105, 107) and a transmitter coil (106). The digital signal generator (103) is adapted for supplying a digital bit sequence selected among, at least two, bit sequences stored in the memory (102) whereby the strength of the magnetic field generated by the transmitter coil (106) can be varied dependent on the bit sequence selected by the control unit (101). The invention further provides a method of controlling the strength of a magnetic field generated by the reader of the monitoring device.

Abstract: A hearing aid comprises a power supply, a microphone and a base part to be arranged outside the ear canal of a hearing aid user, and an ear plug part to be arranged in the ear canal of a hearing aid user. The ear plug part comprises a receiver for transmitting sound into the ear canal, and a transducer generating a signal to be transferred to said base part. A databus connects the ear plug part with the base part. The databus comprises two electrical wires adapted for transmission of signal to the receiver, and for transmission of signal from the transducer to the base part. The databus provides power supply either from the base part to the ear plug part, or, from the ear plug part to the base part. The invention further provides a method for communicating between two parts of a hearing aid.

Abstract: In order to minimize noise and current consumption in an EEG monitoring system (40) which can be continuously carried by a person to be monitored, an input converter (44) for an EEG monitoring system is devised. The analog-to-digital converter of the input converter has an input stage, an output stage, and a feedback loop, and the input stage comprises an amplifier (QA) and an integrator (RLF). A voltage transformer (IT) is placed in the input converter upstream of input stage. The transformation ratio of the voltage transformer (IT) has a transformation ratio such that it provides an output voltage larger than the input voltage, thereby multiplying the signal voltage for the input stage by a fixed factor. The voltage transformer (IT) is a switched-capacitor voltage transformer having at least two capacitors (Cx, Cy, Cz). The invention further provides a method of converting an analog signal, and an EEG monitoring system comprising the input converter (44).

Abstract: A two part hearing aid includes a base part (1) to be arranged outside the ear canal of a hearing aid user, the base part including microphone (3, 4), signal processor (23) and a power supply (8). The hearing aid also includes an ear plug part (2) having acoustic transmitter (5, 10) for transmitting sound into the ear canal, an ear canal microphone (11), and an electronic module (7) connected to said ear canal microphone (11). The hearing aid further includes an elongated member (40) having electrical wires (15, 17, 42, 43) for connecting the ear plug part (2) with the base part (1), using a serial databus. The invention further provides a method for communicating between two parts of a hearing aid.

Abstract: A wearable EEG monitor for continuously monitoring the EEG of a user through capacitive coupling to an ear canal of a user comprises an ear insert (1) for positioning within the human ear canal, comprising at least two capacitive electrodes (16) for recording a signal. The electrodes are coated with a dielectricum for electrical insulation. The electrodes are connected to an amplifier (17). The amplifier has an input impedance matched to the impedance of the electrodes. The invention further provides a method of monitoring brain waves.

Abstract: A hearing aid comprising a wireless transceiver (100) having an inductive antenna (101) and a trimming capacitor (104, 105, 300, 404) with at least two parallel signal paths, wherein at least one of said signal paths comprises a first capacitor (309, 310, 311, 312), a second capacitor (301, 302, 303, 304) and a switching transistor (305, 306, 307, 308) arranged such that the switching transistor (305, 306, 307, 308) is coupled in parallel with said first capacitor (309, 310, 311, 312) and coupled in series with said second capacitor (301, 302, 303, 304), whereby the voltage drop across the switching transistor (305, 306, 307, 308), when the switching transistor is set to off, will be lower than the voltage applied across the trimming capacitor (104, 105, 300, 404) due to voltage division between said first capacitor (309, 310, 311, 312) and said second capacitor (301, 302, 303, 304). The invention also provides a method of fitting a wireless transceiver (100) for a hearing aid.

Abstract: A hearing aid comprises a wireless Frequency-Shift-Keying (FSK) receiver. The receiver has an antenna receiving an FSK signal, a first amplifier stage amplifying the FSK signal, a limiter stage limiting the amplified FSK signal, a plurality of parallel phase detection stages and a lookup table block. Each phase detection stage comprises a local oscillator, a mixer stage, a filter stage, and a comparator stage. The output of each of the respective comparator stages is provided to the input of the look-up table block. The invention also relates to a method for processing a wireless FSK signal for providing a signal for a hearing aid, and a wireless FSK receiver.

Abstract: A programmable hearing aid including means for receiving and transmitting data wirelessly from and to a portable module being in proximity to said hearing aid. Said portable module has means for transmitting audio signals, fitting data or special instructions to the hearing aid processor and including means for receiving data transmitted from said hearing aid, including data representing a monitoring of real-time signal processing parameters in the hearing aid. A preferred embodiment of the hearing aid/portable module combination utilizes Miller-coded direct sequence spread-spectrum radio signal transmitters and receivers for transmitting and receiving data between the heading aid and the portable module. This enables remote controlling or monitoring of, transmitting audio to, or programming of a hearing aid without the need for external connectors.

Abstract: A hearing aid comprises a power supply, a microphone and a base part to be arranged outside the ear canal of a hearing aid user, and an ear plug part to be arranged in the ear canal of a hearing aid user. The ear plug part comprises a receiver for transmitting sound into the ear canal, and a transducer generating a signal to be transferred to said base part. A databus connects the ear plug part with the base part. The databus comprises two electrical wires adapted for transmission of signal to the receiver, and for transmission of signal from the transducer to the base part. The databus provides power supply either from the base part to the ear plug part, or, from the ear plug part to the base part. The invention further provides a method for communicating between two parts of a hearing aid.