U.S. Philips Corporation

Koninklijke Philips Corporation N.V.

Philippe Decotignie

Sabine V Giorgi

Sabine Jourdan

A mobile radiotelephony device intended for accommodating a linked user identification module offers protection against theft. The device prevents a normal operation of the device with an unlinked identification module, and permits the normal operation of the device with the linked identification module until such time the device has been inactive for a defined period of time. A debugging code can be supplied to the device subsequent to a detection of the defined period of time to again permit the normal operation of the device with linked identification module.

Anti-theft protection for a radiotelephony device

A telephone includes circuits that enable a user of the telephone to receive incoming calls and set up outgoing calls. A controller puts the telephone interface in a blocking state to prevent normal use of the telephone when the interface receives a block signal, and puts the interface in a service state to make the telephone accessible. The telephone has a timing circuit that supplies the block signal to the controller after a given period of inactivity of the telephone to place the telephone in the blocking state. An erroneous unblocking code used a predetermined number of times puts the telephone in a state of total block which includes a power cut of the telephone. Turning on the telephone allows leaving the total block state.

Method for avoiding fraudulent use of a mobile radiotelephone by blocking an interface after a certain inactive period of time and mobile radiotelephone performing the same

Device for processing digital signals constituted by image blocks and hierarchically arranged types of data. This device comprises an addressable memory (40) for storing said signals, a circuit (10) for counting, per section, the number of bits corresponding in these signals to each type of data, a circuit (20) for assigning, to each of the image sections and in accordance with a given proportion, the number of bits to be transmitted in channels of different priorities, and at the output of said circuits a control circuit (30) for redistributing the bits for each of the sections and in packets of given lengths comprising at least the first bits of a block and possibly the leftover bits of the other blocks. The invention also relates to the device for inverse processing at the receiver end.

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Le Mans, France

Philippe Decotignie