SU374752A1 - ALL-UNION - Google Patents

Description

The invention relates to broadcasting, in particular to broadcast distribution systems, and can be used in switching and distribution devices included in the low-frequency broadcasting path and intended for switching programs from various sources (for example, from studios, broadcasting points, etc. e.) to consumers (for example, PA radio transmission centers). In order to ensure the speedy redistribution of a large number of program sources between consumers in the radio broadcasting, switches with preliminary preparation are used. In these switches, the necessary connections are prepared in advance and, at the time of redistribution (determined, for example, by the broadcast schedule), using a single operation (for example, pressing a button), the combination of connections in the program transmission path that was existing up to this point is destroyed and a new combination is established. . Known switches of radio programs with pre-preparation, containing several switching fields and a switch that includes one of the switching fields in the program path. All connections made to the switching fields can be checked before switching. For this test, special devices are provided in the switches consisting of a DC source, an indicator and a switch. Despite the use of these devices, the reliability of the switch is not sufficiently high due to the presence in the transmission path of the programs of two consecutive switched contacts: in the switching field and in the switch of the switching state. The purpose of the invention is to reduce the number of contacts in the transmission path of broadcast programs. This is achieved by combining the outputs of the switching fields, preparing the connections and connecting them to the inputs of the diode array. A blocking direction is applied to the matrix outputs, and program sources are connected to its other inputs. The inputs of the switching connection preparation fields through decoupling diodes and the switching state switch are connected to an unlocking voltage source. Ia drawing shows a diagram of the switch. It contains a diode array 1 entering the program transmission path, the elements

the commutation 2, which are diode cells controlled by a constant voltage; switching fields 5 and 4 preparation of connections; Elements 5 of switching preparation fields; dissolving diodes 6; switching state indicators 7; switch 8 switching state; unlocking voltage source 9, lock voltage source 10, isolating resistors 11, indicator 12 prepared connections, switch 13 indicator prepared connections.

The matrix 2 cells / are switched to the "on" state when the switching voltage is supplied to them from the sources 9 through the switch 8 of the switching state and the switching field 3 1 4 of preliminary preparation. In the absence of a switching voltage, the diodes are closed by a locking voltage, which is constantly supplied to the cells from source 10 through resistors.

The switch works as follows. If switch 8 is set to position I, the switch-on voltage from source 9 enters through field 3 at cell 2. The commutator state (connections in the path) is monitored by indicators 7. At this time, field 4 is de-energized and does not affect state of cells 2 of the diode array. On field 4, the closure of the corresponding contacts of elements 5 prepares a new distribution of soda ash inclusions between cell 2, and thus a new distribution of rotation programs between consumers.

The prepared connections in field 4 are checked with an indicator 12, alternately connected with switch 13 to the power supply circuits of the cells under test 2. If the prepared circuit is operational, the indicator shows the locking voltage on the cell being tested. In this case, the cell diodes are also checked for a short circuit. If there is a short-circuited diode in the cell, the voltage on the indicator 12 will be lower than the nominal one.

When the moment of redistribution arrives, switch 8 is moved to position II. Switch voltage on cells. comes now through field 4.

Indicators 7 register the switch to a new state. At the same time, the diodes of the cells to which the switching voltage is applied are tested for breakage at the same time. In the event of a break, the turn-on current decreases or is completely absent. On field 3 disconnected from source 9, preparations are made for the next redistribution.

The number of preparatory fields, as well as the number of switching fields in known devices, iB is generally equal to A. Accordingly, switch 7 may have L positions. The number of cells 2 matrix / does not depend on the number of fields of preliminary preparation.

The switch has a higher reliability than the known one, because, firstly, there is one contact in the program transmission path in the switching working field instead of two in the known switch, and secondly, the contacts of the switching state switch and elements of the switching pre-preparation are not enter the program transmission path and, therefore, even a significant (several times) change in their characteristics (contact resistance, capacitance, etc.) does not affect the path operation.

G1, redeme of the invention

Switchboard of broadcasting programs with preparatory connection preparation, containing switching fields for connection preparation, whose inputs are connected to switching state switch contacts, characterized in that, in order to reduce the number of contacts in the transmission path, the outputs of switching connection preparation fields are combined and connected to diode matrix inputs , to which a blocking voltage is applied, and program sources are connected to other inputs of the diode array, while the inputs of the switching preparation fields connections through decoupling diodes and a switching status switch are connected to a voltage source.

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