Communications: electrical – Continuously variable indicating – With meter reading
Patent
1996-02-01
1999-03-02
Zimmerman, Brian
Communications: electrical
Continuously variable indicating
With meter reading
34028601, 34082536, 340692, G05B 100, G05B 2508, G05B 522, G06F 704
Patent
active
058776982
ABSTRACT:
A system having several transmitters at fixed locations, such as in a supermarket, and a mobile receiver installed in each push-cart. Whenever a push-cart comes within the range of a transmitter, an exclusive link is set up therebetween for relaying to the receiver an audio message prerecorded in the transmitter for the push-cart user to hear. The receivers beam each "listening" control signals within a predetermined range, in response to which a transmitter within the range of one such receiver relays back a "sending" control signal and sends its prerecorded message which the receiver tunes into. The control signals are single-frequency signals modulating infrared carriers. The message signals are recorded preferably in analog solid-state memories and frequency-modulating radio or infrared carriers in different embodiments. Other uses include public galleries and museums, where one such receiver may be carried by the user instead of installing in a cart.
REFERENCES:
patent: 5264822 (1993-11-01), Vogelman et al.
patent: 5406271 (1995-04-01), Sonnendorfer et al.
Kulesz Jose
Kusnier Jaime Hector
Machado Alberto Jose
Jeanglaude Jean B.
Zimmerman Brian
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