Regeneration of signalling pulses
AssigneeSociete Lignes Telegraphiques et Telephoniques
InventorsRaymond Lerault, Jean-Claude Bulte
Life of this patent
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Abstract
Regeneration of distorted signalling pulses is obtained by means of a Schmitt trigger which is fired when the input pulse has varied by a preset value .DELTA.V the maximum voltage of said pulse being stored in a memory device so as to maintain the trigger in the present state. The trigger is switched back during the trailing edge of the pulse when the signal has varied by the same preset value .DELTA.V through inhibition of the memory device. The regeneration meets C.C.I.T.T. R2 regulation.
Claims6
A method for regeneration of signal pulses in an analog communication system by means of a D.C. linear current amplifier coupled to a memory which is coupled to the input of a Schmitt trigger and a return to zero circuit coupled to said memory, characterized by the following steps occurring at each signal pulse:
- developing a first voltage reproducing the leading edge of the signal pulse and applying said voltage to said memory;
- first firing said Schmitt trigger by said first voltage at threshold .DELTA.V;
- generating in said return to zero circuit a second voltage presenting a build up time reproducing the trailing edge of the signal pulse;
- and
- returning to zero the voltage remaining in said memory when said second voltage reaches the .DELTA.V value causing a second firing of said Schmitt trigger.
Apparatus for restoring signal pulses in an analog communication system comprising:
- a D.C. linear current amplifier;
- a memory;
- a return to zero circuit connected in parallel with said amplifier for erasing said memory;
- means coupling said memory to the common output of said amplifier and return to zero circuit;
- a Schmitt trigger having its input connected to said memory B.sup.1 ;
- and
- means for connecting an input signal to the common input of said amplifier and return to zero circuit.
Dependencies are inferred from the claim text.