H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/59 (2006.01) G01S 13/75 (2006.01) G01S 13/76 (2006.01) G06K 7/08 (2006.01) G06K 19/077 (2006.01) H04L 7/04 (2006.01)
Patent
CA 2126874
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.
Assa Abloy Ab
Indala Corporation
Macera John Stephen
LandOfFree
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