Switching arrangement for receiving DC signals

Details Switching arrangement for receiving DC signals Switching arrangement for receiving DC signals

1975-09-15

1976-08-31

Robinson, Thomas A.

Telegraphy

Systems

Line-clearing and circuit maintenance

328164, H04L 2506, H03K 5153

Patent

active

039782832

ABSTRACT:
A circuit arrangement for facilitating reception of direct current signals in telegraph or data transmission systems is described. A threshold circuit is disposed in the receive line; the threshold circuit has two threshold values, one of which is close in current value to the cut-off of the signal element, and the other of which is close in current value to the signal level of a signal element. A timer is switched into the circuit by a signal provided over a logic circuit when a first threshold level is undershot in a descending signal transition and when a second threshold level is exceeded during an ascending signal transition. The timer emits a clock pulse to an output circuit, which has been primed by an input circuit, the operation of which are controlled by signals from the outputs of the threshold circuit.

REFERENCES:
patent: 3327230 (1967-06-01), Konian
patent: 3497723 (1970-02-01), Nelson
patent: 3588712 (1971-06-01), Vozumi

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