| 4368357 |
Bypass apparatus for use in secure communication systems |
| Jan-11-1983 |
A secure communications system provides a non-secure bypass circuit, which circuit is in parallel with a scrambler or other device. The scrambler is operative during a secure mode to convert data or voice... |
| 4363130 |
Binary digital communication system |
| Dec-7-1982 |
1. A binary digital communication system comprising a transmitter and receiver: said transmitter comprising means for alternately radiating in response to the digits of a binary message two signals of... |
| 4326292 |
Random energy communication system |
| Apr-20-1982 |
5. An intelligence communication system comprising a transmitter and a receiver; said transmitter comprising means for obtaining a relatively wide band random energy carrier signal, means for modulating... |
| 4234874 |
Alarm system and method thereof |
| Nov-18-1980 |
A burglar or fire alarm is presented which cannot be disabled by cutting the power or telephone lines and which virtually cannot be radio jammed. A radio transmitter comprises an automatic switch which... |
| 4228321 |
Privacy transmission system with remote key control |
| Oct-14-1980 |
In the prior art key control signals are produced at a scrambling location, used at that location for scrambling and then transmitted along with the scrambled message to the unscrambling location. In accordance... |
| 4192967 |
Teletype mixer apparatus for coding and decoding |
| Mar-11-1980 |
Apparatus for terminating teletype signal lines and mixing cryptographic teletype signals to furnish an enciphered teletype signal including a secondary operating mode of the mixer unit to retransmit the... |
| 4179586 |
System of encoded speech transmission and reception |
| Dec-18-1979 |
A system for the secure transmission and reception of information which uizes pseudo values of phase and amplitude of speech signals, which are related to the original values by specific algorithms. These... |
| 4177355 |
Array device for data scrambling |
| Dec-4-1979 |
This specification describes an array logic chip that can be used to encipher and decipher binary data. The array logic chip contains a matrix of input and output lines with the input lines divided into... |
| 4167700 |
Digital voice protection system and method |
| Sep-11-1979 |
A digital voice privacy electronic communication system and method provides protection for an information signal. Either a clear voice signal or a scrambled digitized version of the voice signal is selected... |
