 System for detecting leaks from liquid-containing reservoirs and conduits |
| In accordance with the present invention, an electrically conductive wire network is placed ... |
|
| Integrator and active filter including integrator with simple phase compensation |
| The present invention has been made in an attempt to solve the above-described conventional ... |
|
| Boomerang |
| It is an object of the instant invention to provide a boomerang having a novel means for ... |
|
| Antenna having electrically positionable phase center |
| An antenna is disclosed herein which includes a central receiving element and a number of variable ... |
|
| Apparatus for scanning and measuring the near-field radiation of an antenna |
| The apparatus described and claimed herein utilizes a radiation sensing probe mounted on a Foucault ... |
|
| Process for carrying out an inspection round of nuclear installations |
| OF THE PREFERRED EMBODIMENTS This industrial site 5 has not shown automatic installations, whose ... |
|
| BCD-to-Binary converter |
| The present invention is directed to improvements in the above described Beougher BCD-to-binary ... |
|
| Decorative waterfall |
| It is noted that the reasons for the acoustics created by a natural waterfall is the open spaces or ... |
|
| Oil-water interfacial detector |
| I claim: 1. An oil-water interfacial detector, comprising in combination, an instrument including a ... |
|
| In-line optical fiber polarizer |
| Briefly, the above and other objects are achieved by reducing the fiber core diameter in a selected ... |
|
|
Encoder and decoder microchips and remote control devices for secure unidirectional communication
| Details |
Inventors: Bruwer, Frederick Johannes; Smit, Willem; Kuhn, Gideon Jacobus;
Assignee: Microchip Technology Incorporated (Chandler, AZ)
Primary Examiner: Holloway, III; Edwin C.
Assistant Examiner:
Attorney, Agent or Firm: Baker Botts L.L.P.
Encoder and decoder microchips suitable for use in secure unidirectional remote control devices. The encoder microchip includes circuits for performing and encoding function on an identification number embedded in the microchip and a combination of a characterization number and a stepping counter value, so as to generate a transmission value which is only decidable by a related decoding function having access to the same identification number. The decoder microchip includes circuits for decoding the transmission value into a decoded characterization number and a decoded counter value and circuits for comparing the decoded counter value with a decoded counter value range. The encoder and decoder microchips are also provided with means for synchronizing the decoder microchip with a particular encoder microchip which has generated a synchronization command. |
|
DETAILED DESCRIPTION It is an object of the present invention to provide encoder and decoder microchips for use in a remote control system of increased security, of which the user friendliness has not been unduly sacrificed, comprising a transmitter remote control device and a receiver remote control device, wherein the transmitter remote control device comprises the encoder microchip, the encoder microchip forming part of an electronic circuit adapted to transmit a coded transmission value decidable by the decoder microchip, and wherein the receiver remote control device comprises the decoder microchip, the decoder microchip forming part of an electronic circuit adapted to receive and to decode the coded transmission.
The higher security remote control systems can be used for control of garage doors, security gates, vehicle alarm systems or any other remotely control device with a requirement for security.
It is a further object of the invention to provide a security system in which synchronization of the transmitter and receiver remote control devices can be achieved by a simple yet reliable and secure manner.
According to one aspect of the present invention, there is provided an encoder microchip comprising: means for storing an identification number; means for storing a characterization number comprising information selected from a group consisting of information identifying a status of the encoder microchip, information identifying a mode of operation of the encoder microchip, information representing a command, and information identifying a unit number of the encoder microchip; means for storing a stepping counter value; means for increasing the value of said stepping counter value each time the encoder microchip is operated; means for combining said identification number with said characterization number and said stepping counter value to yield a combined number; and encoding means for performing a non-linear encoding function on said combined number, so as to generate a transmission value which, upon application thereof of a related decoding function by decoding means forming part of a matched decoder microchip which further comprises means for storing said identification number, is decoded to said characterization number and said stepping counter value
|
|
Communications 
