JPH0670033A - Private branch exchange - Google Patents

Abstract

PURPOSE:To provide the private branch exchange which enables command speaking among a lot of people without applying any sense of incongruity to speakers or generating any oscillating phenomenon. CONSTITUTION:When the command speaking is requested from an extension telephone terminal 2-1, for example, a central controller 5 calls plural command destinations registered on a memory 6 by making telephone calls, and plural voice signals from the called command destinations are inputted through a line circuit or a trunk circuit to an exchange switch circuit 1 and added first of all. Afterwards, a channel in one side direction transmitted through a line circuit 3-1 to the extension telephone terminal 2-1 is formed. Next, when the transmission key of the extension telephone terminal 2-1 is pressed, the central controller 5 performs control for forming the one-side direction channel transmitted while being distributed to the plural command destinations after the voice signal of the extension telephone terminal 2-1 is inputted from the line circuit 3-1 to the exchange circuit 1. Thus, the problem of side noise is eliminated, and command speaking among a lot of people is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange capable of making a command call, and more particularly to increasing the number of participants in the command call.

[0002]

2. Description of the Related Art Conventionally, some private branch exchanges have a function of connecting a plurality of extension lines and office lines and making a command call between one telephone and a plurality of telephones. In the call circuit of such a private branch exchange, four to two signal lines for transmitting and receiving voice are transmitted.
Two or more hybrid circuits for converting from two lines to four lines are inserted into the line, so that a voice communication path in both directions is formed. The performance of this hybrid circuit depends on the circuit coefficient and line condition, etc., and in some cases, the voice signal sent from the terminal telephone is reflected back by the hybrid circuit, or conversely, the received voice is reflected by the hybrid circuit. Then, a phenomenon such as returning will occur. In a bidirectional communication path formed by the private branch exchange for making a normal one-to-one call, sidetone can be reduced by adjusting circuit constants, but one-to-many call like command call. In this case, since voices from a plurality of communication paths are added in the private branch exchange, sidetones are also added at the same time and the sidetones become very large, which causes a problem that the speaker feels uncomfortable. In addition, depending on the circuit constants and line conditions during the command call, voice signals may be reflected between the hybrid circuits, causing a problem such as an oscillation phenomenon. For this reason, when making a command call using the conventional private branch exchange, it is necessary to limit the sidetone level to a level that does not make the speaker feel uncomfortable, so the maximum number of command participants is about 10. However, there is a drawback in that it is practically impossible to make a command call with a larger number of people.

[0003]

When a command call is made by a conventional private branch exchange, since two or more hybrid circuits are present in the formed call paths in both directions, the side tone level participates in the command call. However, there is a drawback that the size of the speaker increases in proportion to the number of people, causing the speaker to feel uncomfortable and causing an oscillation phenomenon. For this reason, the number of participants in the command call must be limited to about 10 at maximum, and there is a drawback that a command call by a large number of people cannot be performed.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to eliminate the above-mentioned drawbacks and provide a private branch exchange capable of making a command call by a large number of people without giving a feeling of strangeness to a speaker or causing an oscillation phenomenon.

[0005]

According to the present invention, in a private branch exchange having a function of performing a command call service, when a command call request is made from an extension telephone terminal which is a command source, a call is made to a command destination registered in advance. Calling means to call over,
First control means for adding a voice signal sent from a command destination called by the calling means to form a first communication path for transmission to the command source, and a voice transmission direction from the extension telephone terminal. A detection means for detecting a reversal request and a second speech path for distributing and transmitting the voice signal of the command source to the plurality of command destinations during a period in which the voice transmission direction reversal request is detected by the detection means. And a second control means to be formed.

[0006]

In the private branch exchange of the present invention, when there is a request for a command call from the extension telephone terminal which is the command source, the calling means calls the command destination registered in advance and calls. First
The control means adds a voice signal sent from the command destination called by the calling means to form a first speech path for transmission to the command source. The detecting means detects a voice transmission direction reversal request from the extension telephone terminal. The second control means forms a second speech path for distributing and transmitting the voice signal of the command source to the plurality of command destinations while the voice transmitting direction reversal request is detected by the detecting means.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a private branch exchange of the present invention. 1 is an exchange switch circuit for performing exchange connection between extension lines or between extension line and office line, 2-1 to 2-n are extension telephone terminals, 3-1 to 3-n are line circuits, and 4-1 to 4-n
Is a trunk circuit, 5 is a central controller for controlling the exchange switch circuit 1 and various communication services, 6 is a memory for storing various data necessary for the operation of the central controller 5, and 7 is a line circuit 2-1. ~ 2-n and trunk circuit 4-
Control data lines connecting 1 to 4-n and the central control device 5, 8 is a control data line connecting the exchange switch circuit 1 and the middle control device 5, and 9 is a premises via the trunk circuits 4-1 to 4-n It is a public network connected to the exchange 1. Incidentally, a hybrid circuit that enables a two-way call is inserted in the above-mentioned extension telephone terminal, line circuit, trunk circuit and the like.

Next, the operation of this embodiment will be described. The central control unit 5 transmits / receives data to / from the line circuits 3-1 to 3-n and the trunk circuits 4-1 to 4-n via the control data line 7, and as a result, via the control data line 8. By controlling the exchange switch circuit 1, the extension telephone terminals 2-1 to 2-n are mutually connected and the extension telephone terminals 2-1 to 2-1 are connected.
-N and the public network 9 are formed to enable a voice call. Here, for example, when a command call request is issued from the extension telephone terminal 2-1, the command call is realized by the procedure according to the flowchart shown in FIG.

For example, when making a call from the extension telephone terminal 2-1, first, the speaker presses off-hook or the extension key in step 201, and then inputs the telephone number using the dial key in step 202. Alternatively, the function stored in the memory 6 is selected by pressing the function key. Since the information output from these extension telephone terminals 2-1 is transmitted to the central control unit 5 via the line circuit 3-1 and the control data line 7, the central control unit 5 executes the step 2
It is determined whether or not the key pressed in 03 is a dial key, and if it is a dial key, the normal exchange processing is performed.
Otherwise, go to step 204. Step 20
At 4, the central controller 5 determines whether or not the pressed key is a command key, and if it is not a command key, it proceeds to normal exchange processing, and if it is a command key, it proceeds to step 205. The central control unit 5 reads the telephone numbers of a plurality of command destinations registered in advance in the memory 6 in step 205, and based on the read telephone numbers, the corresponding command destinations are sent from the corresponding line circuits via the control data line 7. When the command destination is an outside line, a dial signal is sent from the corresponding trunk circuit to the public network 9 when the extension telephone terminal is ringed. As a result, when the central control unit 5 fetches the response information of the called command destination, at step 206, the control data line 8
The exchange switch circuit 1 is controlled via the, and a plurality of audio signals sent from the command destination are added by the conference circuit (described later) 10 and then this is added to the extension telephone terminal 2-1 of the command source.
To the line circuit 3-1. In this case,
Only a one-way communication path for transmitting voice signals of a plurality of command destinations to the command source is formed. Then, the control procedure shown in FIG. 3 is entered.

FIG. 3 is a flowchart showing a control procedure during the command call. Step 301
After receiving the voice from the command destination at the extension telephone terminal 2-1, the extension telephone terminal 2-1 depresses a function key or performs on-hook as necessary. Therefore, the key information from these extension telephone terminals 2-1 is the line circuit 3-1,
Alternatively, it is taken into the central control unit 5 via the control data line 7. As a result, the central control unit 5 makes the step 30
It is determined whether or not the key pressed in 2 is the transmission key, and if it is any other key, the process proceeds to normal exchange processing, and if it is the transmission key, the process proceeds to step 303.
In the case of proceeding to step 303, the central control unit 5 controls the exchange switch circuit 1 to form a one-way communication path in which the voice signal of the command source is simultaneously transmitted to a plurality of command destinations, and thereby the extension telephone terminal 2-1 voice is transmitted to the plurality of command destinations. When the speaker of the extension telephone terminal 2-1 finishes speaking the message, the speaker key of this terminal is released in step 304. The information indicating that the transmission key has been released is taken into the central control unit 5 via the line circuit 3-1 and the control data line 7, so that the central control unit 5 executes step 30.
Exchange switch circuit 1 via control data line 8 at 5
By controlling the above, a one-way communication path for transmitting voices from a plurality of command destinations to the command source (in this example, the extension telephone terminal 2-1) is created. As a result, the speaker of the command source can receive voices from a plurality of command destinations. Then, the process returns to step 301.

FIG. 4 shows an operation of forming a one-way communication path for transmitting voices from a plurality of command destinations to one command source via the exchange switch circuit 1 in step 206 of FIG. 2 described above. It is a figure explaining. Based on the control data from the central controller 5, the voice signals sent from the plurality of command destinations 1 to n are temporarily stored in the buffer memory 11 based on the control signal of the time slot selector 12. The audio signals stored in the buffer memory 11 are sent to the conference circuit 10 and added, and the added audio signals are stored again in the buffer memory 11. The added voice signal of the command destination stored in the buffer memory 11 is transmitted to the line telephone terminal 2-1 which is the command source by being sent to the line circuit 3-1 of FIG. .

FIG. 5 is a diagram for explaining the operation of forming a one-way speech path for transmitting voice from one command source to a plurality of command destinations via the exchange switch circuit 1 in step 303 of FIG. 3 described above. Is. Under the control of the central control unit 5 described above, the voice signal from the command source (in this example, the extension telephone terminal 2-1) is temporarily stored in the buffer memory 11 via the communication path 13. The stored audio signal is read out based on the control signal from the time slot selector 12 and sent to the command destinations 1 to n.

According to this embodiment, when making a command call,
While the call key of the extension telephone terminal of the command source is being pressed,
A one-way communication circuit that forms a one-way communication circuit that transmits the voice of the command source to a plurality of command destinations and that transmits the voice signals of the plurality of command destinations to the command source while the transmission key is not pressed. By forming the above, the problem of reflection and oscillation due to the hybrid circuit of the side sound that occurs when a bidirectional communication circuit is formed as in the past is not caused, so that the command destination can be set by a large number of people of 10 or more. It is possible to easily make a command call without causing the speaker to feel uncomfortable or causing an oscillation phenomenon. Further, in this example, since only one-way communication path is formed, there is no side tone, and hands-free communication can be easily realized by a large number of extension telephone terminals.

[0014]

As described above, according to the private branch exchange of the present invention, it is possible to make a command call by a large number of people without giving a feeling of strangeness to a speaker or causing an oscillation phenomenon.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a private branch exchange of the present invention.

FIG. 2 is a flowchart showing an operation procedure when a command call request is issued from the terminal of FIG.

3 is a flowchart showing a control procedure during a command call by the private branch exchange of FIG.

FIG. 4 is a diagram for explaining an operation of forming a one-way speech path for transmitting voice from a plurality of command destinations to one command source in the private branch exchange shown in FIG.

5 is a diagram for explaining the operation of forming a one-way communication path for transmitting voice from one command source to a plurality of command destinations in the private branch exchange shown in FIG.

[Explanation of symbols]

1 ... Exchange switch circuit 2-1 to 2-n
Extension telephone terminals 3-1 to 3-n Line circuits 4-1 to 4-n
... Trunk circuit 5 ... Central control unit 6 ... Memory 7, 8 ... Control data line 9 ... Public network

Claims (1)

[Claims] 1. A private branch exchange having a function of performing a command call service, when a command call request is made from an extension telephone terminal which is a command source, a calling means for calling and calling a command destination registered in advance. First control means for adding a voice signal sent from a command destination called by the calling means to form a first communication path for transmission to the command source, and a voice transmission direction from the extension telephone terminal. A detection means for detecting a reversal request and a second speech path for distributing and transmitting the voice signal of the command source to the plurality of command destinations during a period in which the voice transmission direction reversal request is detected by the detection means. A private branch exchange comprising: a second control means for forming the same.