INFORMATION TRANSMISSION METHOD

PURPOSE:To inhibit collation of data pulse train when noise is invaded by inverting a data by inverting a data pulse train at each character, transmitting the result, restoring it at the reception side and comparing contents of data pulse train of adjacent characters. CONSTITUTION:A pulse from a transmitter is transmitted repetitively and a data stored in a shift register 11 before is moved to a register 12 at the reception point of time of the next data pulse train and the newly received data is stored in the register 11. Contents of latch circuits 13, 14 are compared by a comparison circuit 15 and when the contents of both the data pulse trains are coincident, a circuit 15 turns on a gate circuit 16. The circuit 15 compares both the inputs when a signe pulse exists in one of the circuits 13, 14,. thus. mis-judgement that both the inputs are coincident by the circuit 15 is snot caused even when a noise pulse is mixed and the device is inactivated.