Societe Lannionnaise D'electronique Sle-citerel S. A.

Compagnie Industrielle Des Telecommunicat.

Alain Lalanne

Yves Renaudin

Andre Lankar

A timebase adapted to be synchronized to an external clock comprises at least one generator incorporating a voltage-controlled oscillator adapted to be controlled by the result of comparing an external synchronization signal from an external clock with an output signal of the timebase. Each generator comprises at least one differential comparator receiving the external synchronization signal and the timebase output signal. It drives a summing circuit on the input side of the control input of the oscillator of the generator in question. The generator further comprises a calibration system comprising a threshold detector connected to the output of the phase comparator, a calibration voltage adjustment circuit connected between the threshold detector and a second input of the summing circuit, and a trigger circuit in and controlling the adjustment circuit.

Externally synchronized timebase

A relay matrix which constitutes an array of switches providing connection points between a set of 'horizontal' inputs and a set of 'vertical' outputs, has n relays per column disposed in p columns. Each relay column is associated with a register which fulfills the functions of controlling and storing the state of the relays of the column. The invention can be applied to switching systems and in particular to automatic telecommunication exchanges.

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Asnieres, France

Alain Lalanne