Magnetic disc coder-decoder

Matched filter communication systems

Means for establishing various communication conditions in a cry

Message format for secure communication over data links

Message generator for a controlled radio transmitter and receive

Message preamble detector

Message preparation timing apparatus

Message verification and transmission error detection by block c

Method and apparatus for altering the synchronous compare charac

Method and apparatus for bi-directional communication via existi

Method and apparatus for burst synchronization in a time divisio

Method and apparatus for byte and frame synchronization on a loo

Method and apparatus for ciphering and deciphering messages

Method and apparatus for code transmission

Method and apparatus for compensation of doppler effects in sate

Method and apparatus for digital data transmission

Method and apparatus for enciphering and deciphering audio infor

Method and apparatus for enciphering and deciphering of informat

Method and apparatus for limiting the number of build-up packets

Method and apparatus for measuring the bit error frequency in a