Abstract: There is provided a control device (220) for an induction loop system configured to: generate a calibration signal (202) having a known amplitude and frequency; feed the calibration signal (202) to an induction loop amplifier (106); detect level of electric current at the output of the induction loop amplifier (106); and determine an adjustment model (400) on the basis of the detected level of electric current and the known amplitude and frequency, wherein the adjustment model (400) is for adjusting the amplitude of a to-be-fed output signal (200) based on the frequency of a to-be-received input electrical audio signal (105) such that the level of the electric current at the output of the induction loop amplifier (106) is within predetermined limits.

Abstract: There is provided a control device (220) for an induction loop system configured to: generate a calibration signal (202) having a known amplitude and frequency; feed the calibration signal (202) to an induction loop amplifier (106); detect level of electric current at the output of the induction loop amplifier (106); and determine an adjustment model (400) on the basis of the detected level of electric current and the known amplitude and frequency, wherein the adjustment model (400) is for adjusting the amplitude of a to-be-fed output signal (200) based on the frequency of a to-be-received input electrical audio signal (105) such that the level of the electric current at the output of the induction loop amplifier (106) is within predetermined limits.

Abstract: A portable electric apparatus enabled for light irradiation substantially independent of a supply voltage and a method for controlling the light irradiation is provided. The device comprises a power source with a wide total operating voltage variation range, a voltage sensor adapted for generating one or more switch control signals, a plurality of light irradiating components, and at least one switch operable in accordance with the switch control signals. The voltage sensor is configured to generate the switch control signals in dependence of a current supply voltage provided by the power source and several voltage variation sub-ranges defined in relation to the total operating voltage variation range.

Abstract: A vibrator mechanism is constructed with a permanently magnetized rotor having an eccentrically positioned center of mass and a flat profile. The magnetized rotor is magnetically coupled to a electrically commutated stator having multiple windings. The vibrator mechanism is assembled for compact mounting within the housing of a communication device.

Abstract: A start up charger and a method of providing an initial charge for a significantly depleted battery of a cellular phone is described in which the charging switch is cycled to provide a pulsed charge to the battery until said battery is charged to the operational voltage threshold of the cellular telephone controller.

Abstract: A start up charger and a method of providing an initial charge for a significantly depleted battery of a cellular phone is described in which the charging switch is cycled to provide a pulsed charge to the battery until said battery is charged to the operational voltage threshold of the cellular telephone controller.

Abstract: In a keyboard arrangement and method for identifying a pressed key according to the present invention, conductor lines (4', 6') at each key (B), which may be connected together, are connected to a ground plane (24, 23, 27) as a response to a pressing (P) of a key. The pressed key (B) is identified by detecting the conductor lines that are connected to the ground plane. All the conductor lines may be connected as pulled-up inputs of a detector circuit, and any conductor line or combination of conductor lines may be used to identify a key. A noticeably greater number of keys may be simply identified with the same number of conductor lines than is possible in a solution according to the prior art. In an advantageous embodiment of the present invention, the means for connecting the conductor lines (4', 5', 6', 7') to the ground plane (27) is a conductive plate (23), which essentially covers the whole keyboard. This also provides a good shield against electrostatic discharges and other interference.