Rca Inc.

Stanley S Brokl

Kenyon E McGuire

Steve J Nossen

A system for reading out the contents of multiple counters onto a common bus comprising a plurality of synchronous binary counters arranged in a ring with each counter having N corresponding stages each having an output terminal on which appears the contents of the stage, an input terminal, and a clock pulse input terminal, with each stage responsive to a clock pulse supplied to its clock input terminal to transfer the signal logic level on its input terminal to its output terminal and with the output terminals of the stages of a given counter comprising the common bus. Also provided is a clock pulse source for supplying clock pulses to all of the clock input terminals and a switching signal source for generating a switching pulse. A switch associated with each stage is responsive to the switching pulse to connect the output terminal of each stage to the input terminal of the corresponding stage of the next adjacent counter in the ring of counters.

Multiple synchronous counters with ripple read

A jam-resistant receiver for a TV signal in which each vertical sync pulse is replaced by several increasingly-delayed symbols from a pseudo-random number generator. A correlator produces a correlation pulse on receipt of a predetermined one of the symbols. The pulse is used to generate reconstituted vertical sync pulses having the correct phase. If the correlation pulse falls below a threshold value due to interference, the receiver automatically shifts to the use of a different symbol for synchronization.

Receiver for jam-resistant TV system

A jam-resistant TV transmission system including means to transmit a composite video signal in which each vertical sync pulse is replaced by several increasingly-delayed symbols from a pseudo-random number generator. Receiver means includes a correlator which produces a correlation pulse on receipt of a predetermined one of the symbols. The timing of the correlation pulse and the known delay of the predetermined symbol are used to generate reconstituted vertical sync pulses.

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Somerset, NJ, United States of America

Stanley S Brokl