Radiotelephone filtering apparatus
First Claim
Patent Images
1. An apparatus for at least partially neutralizing transmission and reception of a radiotelephone in a predetermined interior space, comprising:
- a radiotelephony jammer including at least one transmitter capable of transmitting signals of the same frequencies used for communication between radiotelephones in said space and respective base stations and including means for modifying information transmitted between said radiotelephones and said base stations so as to inhibit use of the radiotelephones in said space; and
means for forming a radio link between said jammer and said base stations and responsive to active radiotelephones for forewarning a respective base station of jamming of communication between the active radiotelephone and the respective base station.
0 Assignments
0 Petitions
Accused Products
Abstract
The apparatus makes it possible to neutralize radio telephones, in spaces to be protected, by jamming the call signals or by modifying the communication signals. The variant embodiments of the apparatus are adapted so as to restrict the volume to be filtered and so as to select the filtering communications.
-
Citations
16 Claims
-
1. An apparatus for at least partially neutralizing transmission and reception of a radiotelephone in a predetermined interior space, comprising:
-
a radiotelephony jammer including at least one transmitter capable of transmitting signals of the same frequencies used for communication between radiotelephones in said space and respective base stations and including means for modifying information transmitted between said radiotelephones and said base stations so as to inhibit use of the radiotelephones in said space; and
means for forming a radio link between said jammer and said base stations and responsive to active radiotelephones for forewarning a respective base station of jamming of communication between the active radiotelephone and the respective base station.
-
-
2. An apparatus for at least partially neutralizing transmission and reception of a radiotelephone in a predetermined interior space, comprising:
-
a radiotelephony jammer including at least one transmitter capable of transmitting signals of the same frequencies used for communication between radiotelephones in said space and respective base stations and including means for modifying information transmitted between said radiotelephones and said base stations so as to inhibit use of the radiotelephones in said space; and
means for detecting a locally active mobile radiotelephone and transmitting to a respective one of said base stations a code requesting filtering by the respective base station without transmitting to the locally active mobile radiotelephone. - View Dependent Claims (3)
-
- 4. An apparatus, located in a predetermined space, working without location determining means incorporated or associated with each radio telephone, making it possible to partially or completely neutralize in that predetermined space transmission and reception capabilities of radio telephones, comprising at least one transmitter for transmitting signals of the same frequencies as the frequencies used for communications between said radio telephones and respective base stations with which they can communicate and for regulating power and radio coverage as a function of the volume of the space, said transmitter comprising means for modifying information contained in signals transmitted or received by said radio telephones or by the base stations.
Specification