Switching of numeric signal equipment - using memory and coincidence detector techniques with two circuits transmitting same data under different conditions

摘要

The switching technique is for numeric signal equipment esp. switching of connection from the input of utilisation circuits with the output of receiving equipment of one or other of two transmission circuits used in numeric modulated RF beams carrying around 140M bits per second. The technique is based on two circuits transmitting the same data but under different propagation conditions. Each transmission circuit has a memory including a read and a write clock and a comparator of the phase of the two clocks. A phase control circuit associated has a switching circuit replacing the read clock before being set on standby. Phase control is by use of a binary train coincidence detector working on the output of either transmission output, the memorys' causing a phase shift of the write clock controlled by the coincidence detector.