A system for sampling and encoding a supported from a document magnetic track in the case of motion of the document by hand.

摘要

System for reading and coding a magnetic track (2) carried by a support document (1), by manually moving the document in front of units for reading and writing, the magnetic track comprising a first part (3) on which a first fixed message characteristic of the document is recorded, the said message being produced in a free-standing system for coding its clock signal, followed by a second part (6) reserved for the inscription of a second variable message, characterised in that the reading-writing device comprises three aligned magnetic heads, the first of which is a reading head (9), the second a writing head (10) and the third a reading head (11), the writing head (10) being connected to a writing-signal generator (12) receiving at input (13), on the one hand, the data of the variable message to be recorded on the second part of the magnetic track, and on the other hand, a clock signal (14) formulated by an electronic circuit (15) receiving at input the signals (16) coming from the third, reading, head, (11), and extracting the clock signal of the said fixed message recorded on the first part (3) of the magnetic track (2), the arrival of the clock signal (14) at the writing-signal generator (12) triggering the said writing. …IMAGE… …IMAGE…