Abstract:
Un sistema y método que comunican señales entre una unidad portátil y un sistema de comunicaciones. El dispositivo portátil se comunica con una unidad base usando un acoplamiento inductivo. La unidad base se comunica con un sistema más amplio de comunicaciones tales como una red telefonica. los transductores multiples ortogonalmente dispuestos son usados en la unidad base para proporcionar un campo magnético más completo y para prevenir los nulos de inductancia mutua que están presentes en un campo magnético. El uso de acoplamientos inductivos de corto alcance reduce los requisitos de alimentacion y limita la interferencia con otras fuentes. El acoplamiento inductivo también puede ser usado para recargar una batería en el dispositivo portátil.
Abstract:
A system and method communicate signals between a portable unit and a communications system. The portable device communicates with a base unit using inductive coupling. The base unit is further connected to a wider communication system such as a telephone network. Multiple, orthogonally arranged transducers are used in the base unit to provide a more complete magnetic field and to prevent mutual inductance nulls which are otherwise present in a magnetic field. The use of short-range inductive coupling minimizes the power requirements and limits interference with other sources. The inductive coupling may also be used to recharge a battery in the portable device.
Abstract:
An integrated circuit module (501), with enclosed semiconductor devices (107, 115), includes a housing (101) with an electromagnetic wave reflective interior surface (103). A transmitter (105), mounted on a semiconductor device (107), transmits signals derived from a semiconductor device (107). An electromagnetic wave receiver (113), is positioned in the housing (101) such that it receives a transmitted wave via a reflective surface (103) along an electromagnetic wave path (117) from the transmitter (105).
Abstract:
A communication link includes a base unit and a remote unit that each include a transmit aerial and a receive aerial. These units communicate via magnetic inductive fields. The transmit aerial may be an array that shapes the field to transmit in front of the base unit to minimize interference between adjacent base units. Transmission from the base unit to the remote unit preferably uses magnetic inductive fields that are orthogonal to the magnetic inductive fields that transmit from the remote unit to the base unit. Accordingly, the aerials include aerials for receiving and transmitting in such orientations. A tri-axial array includes three aerials that are orthogonal to each other to allow the aerials to be driven by currents that are phase shifted and amplitude modulated so that the plane of the field is selectively tilted to maximize coupling between the base unit and remote unit. Such tilting allows the user of the remote unit to move relative to the base unit and maintain maximum coupling.
Abstract:
The present invention relates to a remote-readable transponder arrangement, which is located in connection with the object (10) that one wants to identify and which can be identified by a separate reading device by means of mutual induction. The transponder arrangement comprises a transponder section (7), which comprises a transceiver unit (3) and a coupling means (4) connected to the transceiver unit; the transponder arrangement further comprising a means (8) which increases the reading area and which is inductively connected to the coupling means; and furthermore, a support structure (6) for the transponder section (7) and for the means (8) for increasing the reading area, which means for increasing the reading area has been arranged in the support structure so as to run along the support structure. The transponder arrangement (B) comprises means (9, 19, 29, 20) for placing the circular support structure (6) provided with the means (8) which increases the reading area on an object in such a manner that this support structure is open, and means (11a-11b, 20) for closing the circular support structure (6) after it has been mounted on the object.
Abstract:
The invention relates to a data transmission equipment comprising a first transceiver (A) comprising first means for generating alternating current; a second transceiver (B) comprising second means for generating alternating current and positioned apart from the first transceiver (A); and coupling means (1, 2) positioned in the first and the second transceiver (A, B) for connecting the transceivers together by means of mutual inductance for transmission of data between said transceivers (A, B). To alter the functional properties of the equipment in a manner considerably simpler than previously in view of the manufacturing technique, a flux transformer (C) is provided between said coupling means (1, 2) in connection with at least one transceiver (A, B), the flux transformer (C) comprising a primary coil and a secondary coil (3, 4) with unequal diameters, and one of the coils (3, 4) of the flux transformer (C) is positioned closed to the coupling means (1, 2) of said transceiver (A, B).
Abstract:
The present invention relates to a receiver and transmitter arrangement for a price information system which includes a plurality of price information units in a shop or store, for instance. Each price information unit includes a loop (20) for receiving a signal (f1) from the control unit. When there is no communication with the price information unit, a voltage-controlled oscillator (50) is controlled by an incorporated crystal (46) via a phase locked loop. When communication is effected with the price information units, the voltage-controlled oscillator (50) is controlled in a manner such that the frequency and phase position of the oscillators in the control unit and the price information unit will coincide. This is achieved by activating a phase comparator (58) (with switch 60) which then receives the following input signals: a real value signal (f6) from the voltage-controlled oscillator (50), and two control value signals [(f3a), (f4a)] obtained by passing the signal (f) through two filter and demodulator circuits (30) and (32) and two comparators (34) and (36). The output signal obtained from the voltage-controlled oscillator (50) is passed directly to the filter and demodulator circuit (32) and indirectly to the filter and demodulator circuit (30), via a phase shift circuit (42).