Microchips and remote control devices comprising same

Details Microchips and remote control devices comprising same Microchips and remote control devices comprising same

1997-05-08

2000-08-22

Zimmerman, Brian

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

34082531, H04Q 100

Patent

active

061083267

ABSTRACT:
Encoder and decoder microchips suitable for use in remote control devices. The encoder microchip performs an encoding function on an identification number embedded in the said microchip and a combination of a unit number and a stepping counter value, so as to generate a transmission value which is only decodable by a related decoding function having access to the same identification number. The decoder microchip decodes the transmission value into a decoded unit number and a decoded counter value and means for comparing the decoded counter value with a decoder counter value range. The encoder and decoder microchips are provided with means for changing, e.g. in a preferred mode incrementing, the counter values by a number greater than one after a period of time, subsequent to the encoder microchip being activated or the decoder microchip receiving a transmission value. 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.

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