Method of providing a synchronized data stream suitable for use in a combined FDX and HDX RF-ID system
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United States of America Patent
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Aug 6, 1996
Grant Date -
N/A
app pub date -
May 12, 1994
filing date -
May 19, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method for transmitting a data message comprising a synchronization section and a data section stored in a transponder device (10) to an interrogating device (12) in full duplex mode. The interrogating device (12) continuously emits an interrogating command, the receipt of which in the transponder device (10) prompts output of the data message. Both the sync section and the data section of the data message each comprise a predetermined number of bits in accordance with a given transmission protocol. In the sync section, a predetermined number N of sequential bits of duration .tau. is replaced by a lesser number n of sequential bits of longer duration T, where: T=.tau. N/n. The interrogating device (12) determines the location of the sync section and thus the start of the data section in the received data message by identifying the bits having the longer duration T. For the ratio N/n a value is selected which is smaller than 1.5.
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