Method of transmitting information between two units each provided with means for sending and/or receiving signals
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United States of America Patent
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Nov 13, 2007
Grant Date -
Sep 25, 2003
app pub date -
Mar 20, 2003
filing date -
Mar 25, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The method is one of wireless transmission of information between two units consisting primarily of a portable object, such as a personalized watch (1), and a computer station (20). Each unit includes signal transmitting and/or receiving means (2, 24, 26) switched alternately to a transmitting mode and into a receiving mode. Information is transmitted by transmitting a plurality of information frames alternately between the two units. Each information frame comprises a synchronization field, which includes a particular number of synchronization bytes, an information packet and filler bytes. On receiving a frame, the receiving unit counts the synchronization bytes. The receiving unit transmits, in a heading of the information packet, a synchronization indication which is a function of the number of synchronization bytes received. The synchronization indication is used to correct the size of the synchronization field of the next frame received by the receiving unit. These synchronization field size correction operations are effected in a similar manner in both units.
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