Synchronous universal binary scrambler

System and method for encrypting a voice signal

System and method for extracting timing information from a modul

System for authenticating users and devices in on-line transacti

System for detecting a marker signal inserted in an information

System for enciphering and deciphering data

System for inputting a security code to a computer

System for locally enciphering prime data

System for phase division multiplex duplex communication over a

System for public opinion research

System for simultaneous transmission of several pulse trains

System for switching and safeguarding data in time-division mult

System for transmitting asynchronous bit transitions of data sig

Tamper-proof two-way cable system

Technique for measuring a duration of signaling pulses in a tele

Technique for obtaining symbol timing for equalizer weights

Technique for tracking amplitude fades for multi-amplitude signa

Telecommunication line switching circuit

Telephone line security apparatus

Telephone privacy system