Receiver capable of quickly establishing stable frame synchroniz

Details Receiver capable of quickly establishing stable frame synchroniz Receiver capable of quickly establishing stable frame synchroniz

1985-04-08

1988-12-06

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 9, 380 49, 375110, 375114, 375118, 375116, H04J 306, H04K 100

Patent

active

047900130

ABSTRACT:
In a receiver responsive to an input signal comprising information signals following frame synchronization signals, respectively, frame synchronization is established by a frame synchronization pulse generator (56) with reference to both of the information signals and the frame synchronization signals. A discriminator (57) discriminates between the information signals and other spurious signals by monitoring descrambled digital signals produced by a descrambler (47) in response to the information signals or by monitoring reproduced analog signals into which the descrambled digital signals are converted by a digital to analog converter (51). The monitoring is carried out within silent parts interposed between information parts of either the descrambled digital signals or the reproduced analog signals. The information signals are discriminated either by a preselected pattern inevitably appearing in the silent parts of the descrambled digital signals or by amplitudes of the silent parts of the reproduced analog signals. Alternatively, the information signals may be discriminated by detecting the autocorrelation of the reproduced analog signals.

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patent: 4379206 (1983-04-01), Aoki
patent: 4538281 (1985-08-01), Rajan

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