Improvements in the circuit provisions for the command of an interphonic installation. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the circuit arrangements for the control of an intercom system, of the type that includes an external station equipped with an electro-lock and a plurality of internal stations, characterized in that the arrangement comprises the following elements in combination: - a circuit (RI) revealing the call signals connected to the conductors that arrive at the call buttons of the external station (PE) that, in the event of a call, presents at the output a first configuration of signals or a second configuration signals according to whether a single call signal or several signals arrive respectively at its input; - a timed control circuit (CT), which has a first input connected to a first output of said circuit (RI) whose output is activated for a certain time (I) from each instant in which it appears at the first output of said circuit (RI) the first mentioned configuration; said circuit (CT) further presenting a second input whose excitation takes place in the absence of the command signal of the electroblock and conditions in time (I) the excitation of the output of said circuit (CT); - a coincidence circuit (A) with two inputs, a first input of which is connected to the output of said circuit (CT), the second input being connected to the electroblock control circuit that reaches the internal stations and that presents the output an information (cd), regarding the presence of a signal on its first input and the simultaneous absence of a signal on its second input; - a power distribution circuit (AI), controlled by the information (cd) at the output of said circuit (A) that supplies the circuits and installations present in the external station and in the internal station; - a circuit (AB), present in each internal station, that receives the call signal from the external station (PE) and a signal (a) from said circuit (IN) that characterizes the absence of an external call, enabling said circuit (AB) the power supply of the called internal station (PI) every time the call signal is present and keeping said enable connected while the signal (a) is present. (Machine-translation by Google Translate, not legally binding)