| 摘要 |
A circuit arrangement for determining specific characters which occur directly consecutively in a sequence of characters, wherein at least one established sequence of characters in a likewise established frequency emits a message signal which can be used to trigger control processes only in the event that characters comprising an established sequence of character elements have occurred in a likewise established frequency directly consecutively in the sequence of characters. The invention is particularly useful in teleprinter exchange systems and is particularly characterized in that the character elements of each character are used to operate a memory which, only when an established sequence of character elements is contained in the relevant character, emits control signals which are characteristic of the sequence of character elements to an evaluation circuit. A counter is connected behind the evaluation circuit and the evaluation circuit is designed in such a manner that only by emission of the specific control signals is it able to trigger counting processes in the counter. The counter executes a counting process only in the event that the control signal with which it has been supplied by the evaluation circuit is identical to the control signal with which it has been previously supplied, whereas on the occurrence of a control signal which differs from the control signal previously supplied to the counter, the counter is set to an established count.
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