Communications: electrical – Continuously variable indicating – With meter reading
Patent
1981-03-09
1984-01-17
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082569, H04Q 900, H04B 700
Patent
active
044266375
ABSTRACT:
A dual purpose integrated circuit device which can be utilized both as an encoder for providing digital signals according to a preselected code and as a decoder for comparing a received signal with an internally generated digitally coded signal. The device includes a plurality of input/output ports for making an electrical connection between external circuitry and functional portions of the device. The device includes a pulse generator for providing digital signals at its output according to a preselected code. The output of the generator is coupled to an output port for supplying the digital signals to a transmitter when used in the encoding mode, and provides the internally generated comparison code in the decoder mode. Improved circuitry is provided for selectively adjusting the level of security for a system utilizing the device in a transmitter-receiver system for activating a load such as a garage door opener, as well as for accommodating noise levels which may be encountered in authorized use.
REFERENCES:
patent: 4114141 (1978-09-01), Travis
patent: 4141010 (1979-02-01), Umpleby et al.
patent: 4272766 (1981-06-01), Stucker et al.
patent: 4305060 (1981-12-01), Apple et al.
Apple William C.
Jacob Keith D.
Multi-Elmac Company
Yusko Donald J.
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