JPS59198048A - Telegraph conference communication system - Google Patents

Abstract

PURPOSE:To avoid interference due to simultaneous calling from >=2 parties by providing a transmission/reception function and a switch function to a line circuit and a trunk circuit so as to make a call by only a subscriber approved of communication request. CONSTITUTION:When a call request signal from a subscriber 36 is detected from a selection signal receiver 11b of an incoming track 5b, a common control circuit transmits a response signal to the subscriber 3b from a selection signal transmitter 10b of an output trunk 4b. Then, only a telegraphic message transmitted from the subscriber 3b is received by subscribers 3a, 3c by closing a switch 12c of the incoming trunk 5b, a switch 12a of a line circuit 2 and a switch 12d of an outgoing trunk 4c.

Description

[Detailed description of the invention] This invention is a telegraph conference communication method using a telegraph exchange. First, the electronic exchange shown in FIG. 1 will be explained.

In the figure, (1) is a switch for exchange connection, (2
) is a line circuit for transmitting and receiving subscriber line monitoring signals with the subscriber telegraph terminal (6a), (4a) and (5a) are outgoing trunks and incoming trunks for transmitting and receiving monitoring signals with other exchanges, ( 6) l (7) is an outgoing sender and incoming register for transmitting and receiving selection signals with other exchanges, (8) is an outgoing register for receiving subscriber line selection signals from the originating subscriber, and (9) is an outgoing register for receiving the subscriber line selection signal from the originating subscriber. This is a common control circuit that monitors and controls the switch (1) excluding the subscriber telegraph terminal (6a) and each of the trunks (2) to (8) above.

In the electronic exchange with the above configuration, the originating subscriber (
6a), when the common control unit (9) detects the monitoring signal of the transmission line via the line circuit (2), the common control circuit (9) transmits the line circuit (2) and the transmission register (
8) via a switch (1a), and receives a selection signal from (6a) via a transmission register (8). The common control circuit (9) analyzes the received selection signal,
After capturing the empty outgoing trunk (4a) and incoming trunk (5a) to the exchange in which the called subscriber is accommodated, and sending a selection signal (calling signal) from the empty outgoing trunk (4a), the outgoing sender (6) and After connecting the available trunk (4a) and sending the selection signal, it waits for a monitoring signal (connection completion signal) from the destination station.When it is detected from the incoming trunk (5a), the outgoing trunk (4a), and the incoming trunk ( 5a) and line circuit (2)
are connected via switch (1a). The process of outgoing connection has been briefly described above, and next the process of incoming connection will be briefly described.

When a supervisory signal (calling signal) is detected from the incoming trunk (5a), the common control circuit (9) connects the incoming trunk (5a) and the incoming register (7), and receives the selection signal that is subsequently sent out. , to identify the terminating subscriber (in this case, the terminating subscriber is (6a)).

After the common control (b) path 19) sends a monitoring signal (activation signal) from the line circuit (2) to the subscriber's telegraph terminal (6a), it connects the outgoing trunk (4a) and incoming trunk (5a) in the same manner as the outgoing connection.
and the line circuit (2).

When a conference communication is configured between one local subscriber (6a) and two other subscribers (6b) and (6C) in a telegraph exchange that has the above-mentioned process for connecting calls in and out, the connection concept is as follows. As shown in Figure 2, when the intersection of the matrix switch (1b) is closed as shown in the figure, the outgoing line of the subscriber (6a) is connected to the incoming line and joining line of each of the subscribers (3b) and (3c). The outgoing line of subscriber (6b) is subscriber (6a), (
The incoming line of 6c) and the outgoing line of subscriber (6C) are subscriber (
It is connected to the input lines 6a) and (6b) to configure conference communication. Note that the process of connecting the matrix switch shown in FIG. 2 is outside the scope of the present invention, so a description thereof will be omitted.

Once the configuration shown in FIG. 2 is established, for example, if subscriber (3a) and subscriber (6b) make calls at the same time, subscribers (3a) and (6b) can correctly send and receive messages to each other. In (6c), it is impossible to receive the correct message due to interference, and if three parties transmit at the same time, it becomes impossible for all three parties to receive the message.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional system, and by providing the line circuit and the outgoing and incoming trunks with switch and selection signal transmission/reception functions, it is possible for the subscriber to make a call request to the exchange. This provides a teleconference communication system that does not cause interference even when three parties or three parties make simultaneous calls by allowing only those who have issued and accepted calls to make calls.

An embodiment of the present invention shown in FIG. 6 will be explained below. In Fig. 6, (2) is a line circuit to which the functions shown in Fig. 4, which will be described later, are added.
) is connected to a local subscriber (6a). (4b)
(4c) is an outgoing trunk to which one function shown in Fig. 6 (described later) has been added, (sb) (5c) is an incoming trunk to which a function shown in Fig. 5 (described below) has been added; ), (4C), incoming trunk (5b), (5C)
Subscribers (6b) and (6C) of other stations are connected to the other stations, and conference communication is performed via the matrix switch (1b).

Figure 4 shows an additional functional part added to the transmission/reception circuit of Caro incoming line monitoring (No. G), which is a function of the conventional line circuit.
(10a) is a selection signal transmitter (Ila) is a giant I receiver, and (2) is a switch, all of which are monitored and controlled by a common control circuit (9).

Figure 5 shows the powerful zero-opportunity part that is added to the receiving circuit for the station line monitoring signal, which is the function of a conventional incoming trunk.11b
) is a supervisory signal receiving circuit, (12c) is a switch, and these iJ are all monitored and controlled by a common control circuit (9).

Furthermore, FIG. 6 shows an additional functional part added to the transmission circuit for the supervisory signal of the office line, which is the function of the conventional outgoing trunk.
In b), the supervisory signal transmitting circuit (12d) is a switch, and these are all supervisory-controlled by the common control circuit (9).

In the above configuration, as shown in FIG. 6, the common control unit (9) connects the intersections of the matrix switch (1b), and then connects the subscriber circuit (2), the incoming trunk (5b),
(5c) and the switches (12a) to (12d) of the outgoing trunks (4b) and (4c) are opened, and the supervisory signal transmitter (1
After sending a conference connection completion signal from 0aX1ob) to the three parties, it waits for a call request signal from each subscriber. For example, subscriber (
6b) is detected by the selection signal receiver (iib) of the incoming trunk (5b), the subscriber (6b)
If it is possible to give the transmission right to the common control circuit (9)
is the later incoming trunk (5b) which sent the response signal from the selection signal transmitter (10b) of the outgoing trunk (4b) to (6b).
Switch (12c)% Line circuit (2) switch (12a) and outgoing trunk (4c) switch (12d)
), the subscribers (3a) and (6c) can receive only the exchanges sent from the input station (6b). When the subscriber (6b) ends communication, he sends out a communication end signal. Common side ml IE that detected this
Circuit (9) returns switches (12a) to (12d) to the open state. In addition, three other parties also subscribed to the same signal (6
b) Know the distribution of transmission rights.

In the above embodiment, the case of a three-party conference was described, but the conversation may consist of three or more people, and the station is not limited to within the own station and other stations; Any combination of other stations may be used.

Further, the communication line may be a half-duplex line instead of a full-duplex line, and the switch (1b) may be any type of switch, not just a matrix switch, regardless of space division or time division.

As described above, according to the present invention, the line circuit and the input/output trunk circuit are equipped with a transmitting/receiving function and a switching function so that only the subscriber whose communication request is accepted can make a call, and three or more parties can make simultaneous calls. This has the effect of avoiding interference caused by interference, and smoothing out telegraph conference communications.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a telegraph exchange, Fig. 2 is a block diagram showing a conventional telegraph conference communication system, Fig. 6 is a block diagram showing a telegraph conference communication system of the present invention, and Fig. FIGS. 5 and 6 are block diagrams showing an example of the line circuit shown, and FIGS. 5 and 6 are block diagrams showing an example of the incoming and outgoing trunks shown in FIG. In the figure, (ib) is a matrix switch, (
2) is the line circuit, (4b), (4c) outgoing trunk, (5b), (5c) incoming trunk, (10a),
(10b) is the selection signal sending R1 (11a), (11b)
is a selection signal receiver, and (12a) to (12d) are switches. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent: Masuo Oiwa Figure 1 Figure 2 Figure 3 b Written amendment to procedure (voluntary) 1, Indication of IIJ'C Patent application No. 58-74
265 No. 2, Benefits of the invention, Telegraph conference communication system 3, Person making the amendment Representative Hitoshi Katayama Department 1 Agent 5, "Detailed description of the invention" column of the specification subject to the amendment and drawings 6, Amendment Contents 1) "Within your own station - not limited to other stations" on page 7, line 10 of the specification is amended to ``within your own station - considered, not limited to three other stations'' 2) Figure 1 of the drawings. Correct the errors in the attached drawings. that's all

Claims (1)

[Claims] In a teleconference communication system that connects line circuits connected to each subscriber and input/output trunks via a switching device, and communicates between the multiple subscribers, transmission/reception is performed to/from the shoe line circuits and input/output trunk circuits. and a switch function, the switch function is activated depending on the transmission/reception status of each of the circuits, and only a subscriber whose communication request is accepted can make a call.