Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-12-10
1985-11-19
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
455 36, 34082577, H04B 116, H04Q 138
Patent
active
045545421
ABSTRACT:
A decoder for receiving and decoding a coded signal includes a particular frequency f.sub.o with a first and second amplitude. The first amplitude of the frequency f.sub.o is associated with the end of a first coded message while the second amplitude of the frequency f.sub.o is associated with the beginning of a second coded message. The decoder includes a receiver for receiving the coded signal, a tone detector circuit for detecting the frequency f.sub.o, a level sensor responsive to the receiver output, a function block for performing a command and a control unit responsive to the tone detector circuit and the sensor means. The tone detector and control unit operate in one of at least two possible states. In the first state the control unit causes the tone detector to respond to the first amplitude of the frequency f.sub.o. When the level sensor senses the second amplitude of the frequency f.sub.o the control unit responds by placing the tone detector circuit into its second state. In its second state, the tone detector circuit detects whether the level sensor was tripped by the frequency f.sub.o or by some other frequency. If the tone detector circuit detects the frequency f.sub.o, the control unit causes the decoder to end its decoding of the first message and begin the decoding of a second message. If the tone detector circuit in its second state fails to detect the frequency f.sub.o, the control unit returns the tone detector circuit to its first state so it may continue to decode the first amplitude of the frequency f.sub.o associated with the first coded message.
REFERENCES:
patent: 3341816 (1967-09-01), Davis et al.
patent: 3506967 (1970-04-01), Foley
patent: 3544983 (1970-12-01), Wallace, Jr. et al.
patent: 3577080 (1971-05-01), Cannahe
patent: 3704447 (1972-11-01), Reader et al.
patent: 4385398 (1983-05-01), Wycoff et al.
Motorola Inc.
Roney Edward M.
Southard Donald B.
Yusko Donald J.
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