| 摘要 |
<p>A communications scrambler operates on a digital basis in which digital or digitised incoming and outgoing signals are merged (60) into a single bit stream for application to a binary bit store (12) and retrieval therefrom for separation (62) of those signals. Multi-bit segments of each signal represent unintelligibly fragments of those signals and are stored and read-out under control of store addressing counters (36, 38, 76) whose outputs are selectively modified (48, 50) to achieve time-dispersion encryption/decryption for outgoing/incoming signals in multi-plexed writing and reading of the store (12). Digitisation (52, 54)and reconstitution (64, 66) of analogue incoming and outgoing signals is provided using inherently digital on-chip circuitry and one-bit per sample at a high rate for easy interfacing in telephone/radio systems. The whole control system can be put onto a simple semiconductor chip of ULA type.</p> |
