Pulse or digital communications – Repeaters – Testing
Patent
1986-09-22
1989-04-11
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
34082573, 455 57, 358144, H04L 2700, H04L 2718
Patent
active
048212911
ABSTRACT:
The invention comprises a low power broadcast system that is applicable especially to the so-called "electronic shelf" for retail stores, wherein the shelf edge carries price displaying modules that can be addressed and controlled from a central computer operated station. The system also permits the modules to broadcast back to the central station to confirm safe receipt of data and to give information as to stock levels, etc. A broadcast system avoids the need for wiring so that location changes are facilitated. To overcome the extremely noisy environment and to conserve power consumption, and hence battery life, the system employs a low frequency (132 kHz) reference carrier transmitted by the base station in discrete segmented packages, each of which frames a base data word transmitted by the base station and a corresponding module data word transmitted by the module a fixed period after the end of the base word; the base receiver then has precise time information for receipt of the module word and can "look" for it among the noise. The carrier received by the module is divided and the lower frequency used to demodulate the information-carrying transmission from the base station of the same frequency, avoiding the need for a phase locked loop detector; this lower frequency is also used for the module transmission. The module employs an air-cored loop antenna coil for the lower frequency and a ferrite-cored loop antenna for the higher reference frequency, while the store antenna is segmented for selection of the group of modules to be addressed; the antenna contacts the metal shelving to provide electromagnetic coupling thereto. Each module contains a microprocessor which controls the operation. Each module has "concealed" buttons which can be enabled and used to insert data to be transmitted therefrom. A charging circuit can be used as the power source employing the received RF carrier energy.
REFERENCES:
patent: 1790486 (1927-09-01), Roberts
patent: 1818669 (1931-08-01), Beckmann
patent: 2028212 (1936-01-01), Heising
patent: 2154923 (1939-04-01), Walter
patent: 2719284 (1955-09-01), Roberts et al.
patent: 3040315 (1962-06-01), Kramer
patent: 4002886 (1977-01-01), Sundelin
patent: 4028537 (1977-06-01), Snow
patent: 4339772 (1982-01-01), Eilers et al.
patent: 4500880 (1985-02-01), Gomersall et al.
patent: 4521677 (1985-06-01), Sarwin
Stevens John K.
Waterhouse Paul I.
Griffin Robert L.
Huseman Marianne
LandOfFree
Improvements in or relating to signal communication systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Improvements in or relating to signal communication systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improvements in or relating to signal communication systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-672137