METHOD FOR RECORDING A NEW CODE MESSAGE, IN PLACE OF AN ANCIENT CODE MESSAGE RECORDED ON A MAGNETIC TRACK RIDED BY A SUPPORT DOCUMENT, BY MANUAL MOVEMENT OF SAID DOCUMENT AND SYSTEM FOR IMPLEMENTING THE METHOD.

摘要

P The method consists in that the message is broken down into a first part M1 and a second part M2 separated by an interval I and that for writing the first part M1 of the new message, it is used as a signal clock, the clock signal extracted from the reading of the second part M2 of the previous message and for the writing of the second part M2 of the new message, is used as clock signal, the clock signal extracted from reading the first part M1, newly registered, of the new message. The system comprises a writing head (9) framed by two synchronization heads (8, 10) and an electronic circuit (15) which generates, from the signals of the two synchronization heads (8 and 10), a signal of clock (14) slaved to the scroll speed of the support document (1). This clock signal (14) is sent to a write generator (12) connected to the write head (9). The write generator further receives the data (13) to be recorded. / P