| Patent Number |
Title Of Patent |
Date Issued |
| 5249232 |
Data processing system having an encryption device |
September 28, 1993 |
| A data-processing system includes an address bus and a data bus operatively coupled to a central processing unit, main memories, and control circuits for peripheral equipment, information carried on the data bus being encrypted. An encryption and decryption device is operatively coupled |
| 4955039 |
Quadrature receiver |
September 4, 1990 |
| A quadrature receiver is disclosed which contains two mixers (M1, M3) in an in-phase receiving path and two mixers (M2, M4) in a quadrature receiving path for converting a received signal to a low IF. Each of the mixers is fed with an oscillator signal (O1 through O4), with the oscillato |
| 4757535 |
System for encrypted information transmission |
July 12, 1988 |
| A system for encrypted information transmission is disclosed in which so-called recording interference is suppressed. Encryption is effected by means of a periodically recurring pseudo-noise sequence (key word). Synchronization between transmitter and receiver is produced by means of a |
| 4718113 |
Zero-IF receiver wih feedback loop for suppressing interfering signals |
January 5, 1988 |
| A working on the zero IF principle is disclosed which contains a feedback circuit instead of a preselector for suppressing interfering signals. The interfering signals contained in the incoming signal (F.sub.E) are separated from the useful signal by filters in the baseband. They are the |
