Thomson Multimedia S.a.

Thomson-csf

Thomson Consumer Electronics Inc.

Mario De Vito

Joseph Colineau

Michel Audoin

Louis Gregoire

Jean-Bernard Fischer

Charaf Hanna

Jacques Stern

Helmut Burklin

Process for reading information

The present invention relates to a method of processing a digital signal of dimension k, in a so-called secure communication system, such that the digital signal (y) at output cannot be deduced from the digital signal (x) at input, consisting in dispatching the digital signal (x) to a device effecting a one-way function. The method includes the following steps:

Method for processing a digital signal in a so-called secure

For the selection of the columns of elementary heads of a multitrack recording head, the method makes use of a bipolar pulse with amplitudes +2I/3 and -2I/3. For the selection of lines of elementary heads, it makes use of pulses with an amplitude of +I/3 or -I/3. And for the non-selected lines, it uses a bipolar pulse that is in phase opposition with respect to the column selection pulse and has amplitudes of +I/3 and -I/3.

Method for the addressing of elementary heads of a multipack head for

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Strasbourg, France

Mario De Vito