Communications: electrical – Continuously variable indicating – With meter reading
Patent
1992-01-22
1995-01-17
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082531, 340572, 235440, G06K 700
Patent
active
053829522
ABSTRACT:
A transponder for use in an object identification system including an interrogator which transmits a continuous interrogation signal and detects a responsive identification signal transmitted by the transponder. The transponder receives and detects the interrogation signal and, in response to receipt of the interrogation signal, produces a repeating identification signal having a fixed number of binary bits consisting of an identification data portion of a specified number of consecutive bits less than one half of the fixed number of bits, and a synchronization pattern of consecutive bits consisting of first, second and third bits of alternating binary values, a consecutive sequence of a plurality of bits which are all of the same binary value as the second bit, and a single bit of the same binary value as the first and third bits. The identification signal is modulated onto a carrier signal and transmitted. Preferably, the first, second and third bits and the sequence of a plurality of bits constitute one half of the fixed number of binary bits of the identification signal, with the binary value of the first bit being a binary 1.
REFERENCES:
patent: 4353064 (1982-10-01), Stamm
patent: 4818855 (1989-04-01), Mongeon et al.
patent: 5028918 (1991-07-01), Giles et al.
patent: 5175418 (1992-12-01), Tanaka
Indala Corporation
Merz Edward
Yusko Donald J.
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