JPS59216360A - Telephone conference trunk - Google Patents

Abstract

PURPOSE:To utilize all voice adders to perform plural conferences in one conference trunk by providing a switch between the output of the voice adder in the preceding stage of the conference trunk and the input of the voice adder in the succeeding stage of the conference trunk and controlling inputs to voice adders in the second and following stages with the switch. CONSTITUTION:In case of a conference among 4-6 persons, switches 7a and 7b are closed to use an output 5e of a voice adder 6e in the second stage. A switch 7c is opened at this time, and an output 5d of a voice adder 6c in the first stage is used if a tripartite conference is requested. The number of inputs of the voice adder in each stage may be (4) or more though it is set to (3), and the number of voice adders in the first stage may be (4) or more though it is set to (3) and the number of stages of voice adders may be (3) or more though it is set to (2).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to conferencing (-rank) of telephone exchanges.

FIG. 1 shows a portion of the configuration of a conventional exchange that is relevant to the present invention.

la, lb... are subscriber telephones of an exchange; 2 is an exchange switch to which the subscriber telephone 1 is connected; 3a, 3b.
. . . input lines 4aJ, 4a2...4b↓ from the exchange switch 2 on the conference trunk.

4b2..., - and output ports 5a, 5b, . . . to the exchange switch 2.

FIG. 2 shows the connection of lines when a conference is held using Lj and 3-H in the configuration shown in FIG.

Conventional conference trunks are connected to a switch as shown in FIG. 1, and each conference trunk has as many inputs as the maximum number of conference participants possible on that trunk.

In order to simplify the explanation, FIG. 2 shows the connection of the communication path when three people input the conference trunk.

The operation of conference 1-rank will be described below with reference to FIG.

Each transmission path of subscriber telephone 1a+ lb, lc is connected to input line 4 of conference 1-rank 3a via exchange switch 2.
connected to al, 4a2, and 4a3.

Each input is added by an audio adder 6a, resulting in an output 5a. The voice addition output 5a is connected by an exchange switch 2 to a reception path to each subscriber telephone 1a, jb, and Ic. This allows each subscriber to hear each other's audio from other conference participants.

In the above explanation, in order to simplify the explanation, the audio adder was assumed to be powered by three people and has one output, but it is assumed that the adder is powered by three people and outputs three outputs, and the sum of the signals of the large signal lines 4al and 4a2 is calculated by the output line 5.
al to subscriber telephone lc, input line 4a2
．． It is conceivable that the sum of the signals of 4a3 is outputted to the output line 5a2 and sent to the subscriber telephone 1a, and the sum of the signals of the input lines 4al and 4a3 is outputted to the output line 5a'3 and applied to the subscriber telephone 1b. The idea is the same.

Conventional conference trunks are configured as described above, so the exchange must be equipped with conference trunks with various input numbers depending on the size of conference participants, or the necessary number of conference trunks with the largest size. There were drawbacks such as.

By the way, the present inventor has developed a third method to solve the above-mentioned drawbacks.
We have already developed the conference trunk shown in the figure. In FIG. 3, the names of each part are the same as in FIG.

6d, l 1llil 6 in the second row, maximum 9 using e
It is a conference trunk that allows conferences for subscribers.

In FIG. 3, when a conference is held, the first stage audio booster 6b is used as in the conventional example.

If one of 6c and 6d is used, for example 6b, inputs 4bl, 4b2.4b3 and output 5b may be connected as shown in FIG. Furthermore, if two or three sets of conferences are to be held between three subscribers, this can be achieved by using the first-stage audio adders individually. A conference with 4 to 6 people can be held by using the first stage audio adder 2 (flit) and the second stage audio adder 6e, for example, by selecting 6b and 6c as the first stage. It will be done.Saratko 7~9 people
In order to keep the explanation simple, a meeting of 3 people is explained above.
A conference trunk with one human power output was used, but as described in the case of the conventional circuit shown in Fig. 2, it had three human power outputs, and its inputs were the A, B, and C1 outputs.

When E, F, A+B goes to F, B+C goes to D, A+
It is also conceivable to output C to E, and output the outputs F, D, and E to the receiving channels of subscribers connected to human power C, A, and B, respectively, but the idea is the same. However, this conference trunk has the disadvantage that it cannot be used even when the remaining adders are free when a conference is being held with 4 to 6 people.

The present invention was made in order to eliminate the drawbacks of the conference trunk according to the inventor's earlier application, and a switch is provided between the output of the audio adder at the front stage and the input of the audio adder at the rear stage. The aim is to provide a conference call trunk that can use all audio adders.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a teleconference trunk according to an embodiment of the present invention, in which the same reference numerals as in FIG. 3 indicate the same parts. 7a to 7C are first stage audio adders 6b, 6c, 6
These switches are respectively provided between the output of the audio adder 6e and the input of the second stage audio adder 6e.

Next, the operation will be explained.

In FIG. 4, when a conference is held with 4 to 6 people, switches 7a and 7b are closed and the output 5c of the second stage audio adder 6e is used as before. At this time, the switch 7C is left open, and the output 5d of the first-stage U voice adder 6d is used if there is a request from the champion conference.

In the above embodiment, the number of inputs to the audio adders in each stage was 3, but this number may be 4 or more, and the number of audio adders in the first stage was 311M, but this may also be 4 or more. . Further, the audio adder may be analog or digital, and the exchange switch may be a space division method or a time division method. Furthermore, the number of stages of the audio adder is 2 stages in the above embodiment (7
However, this may be three or more stages.

As described above, according to the present invention, a switch is provided between the output of the audio adder in the previous stage of the conference trunk and the input of the audio adder in the subsequent stage, and the input to the audio adder in the second stage and subsequent stages is controlled by the switch. Since it is controlled by a switch, it is possible to conduct multiple conferences within one conference trunk using all the audio adders.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of a conventional switchboard that is related to the present invention, Fig. 2 is a diagram illustrating the configuration of a conventional telephone conference trunk, and Fig. 3 is a diagram showing the configuration of a conventional telephone conference trunk. FIG. 4 is a diagram showing the configuration of a conference trunk according to an embodiment of the present invention. 1...Subscriber telephone, 2...Exchange switch, 3...
・Conference trunk, 4...Conference trunk input line, 5
...Conference trunk output line, 6...Audio adder,
7...Switch. Agent Masuo Oiwa 1st drawing 2nd drawing 3rd drawing

Claims (1)

[Claims] (1) A teleconferencing trunk that is connected to multiple subscriber telephones via an exchange switch to enable teleconferencing for multiple subscribers, in which audio adders are provided in multiple stages, and the audio adders in each stage are A telephone conference trunk characterized in that all outputs can be connected to the exchange switch, and a switch is provided between the output of the audio adder in the preceding stage and the input of the audio adder in the succeeding stage.