Jamming apparatus and method for jamming a target signal

Jamming device for mobile communication

Jamming process and system

Key allocation in public communications systems taking...

Key distribution system for distributing a cipher key...

Local orderwire facility for fiber optic communication system

Log-in security device

Masking sound generator

Matched filter communication systems

Method and apparatus for a rolling code learning transmitter

Method and apparatus for coherent communication in a...

Method and apparatus for combining space-frequency block...

Method and apparatus for continuous cross-channel interleaving

Method and apparatus for data encryption and transmission

Method and apparatus for decryption of an information packet...

Method and apparatus for distorting a speech signal

Method and apparatus for enciphering and deciphering audio...

Method and apparatus for encryption of wireless communication

Method and apparatus for establishing usage rights for...

Method and apparatus for handoff within a communication system