JPS61193553A - Conference call set - Google Patents

Abstract

PURPOSE:To easily make a conference call possible between optional time slots by accessing each address information of a bus memory registered at each memory area and outputting a call signal accumulated at each time slot. CONSTITUTION:A counter 13 accesses repeatedly to each time slot of a control memory 14 with high speed in each memory area of which each address information of conference attendees is registered and reads out a plural address information loaded in the memory area according to the time slot in the time slot period in order. A read out call signal is inputted to an adding circuit 17 and by the feedback inputting of of an output which is stored temporarily at a register 19 under a control of a control circuit 18, an accumulated add value of the call signal which is read out in one time slot period in order. An obtained signal by the adding process is outputted as a call signal that is operation processed for a conference to each caller to whom the time slot is assigned. Therefore, it is easily possible to have a conference call.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a conference call device that can easily deal with fluctuations in the number of conference participants without waste.

[Technical background of the invention and its problems]

Recently, with the automation of offices in companies, etc.
Digital switching equipment has become central to office communications. Among the various functions that this digital exchange has, the teleconferencing function greatly contributes to improving the efficiency of office operations.

However, conventional conference call devices for digital exchanges have problems such as the control of conference calls becoming complicated, for example when there are multiple conferences with different numbers of participants or when the number of conference participants changes. Ta.

That is, conventionally, a conference call device in a digital exchange is
Generally, it is constructed as shown in FIG. In FIG. 5, a central control unit (CPU) 1 controls the operations of a time division switch circuit (TSW) 2 and a conference call device 3, and communicates with the time division switch circuit through a subscriber circuit (LC) 4. (The time division switch circuit 2 exchanges and controls calls between the plurality of telephones 5 connected to the TSW>2. By performing division multiplexing and exchanging the time slot of each time-division multiplexed call signal with the time slot of the telephone 5 of the communication partner, calls between a plurality of telephones 5 are time-division exchange controlled. , this call exchange control by exchanging time slots is performed under the control of the central controller 1.

Thus, the conference call device 3 has a register (REG) group 6 (register 6a, register 6a,
6b, to 6n), a selector (SEL) 8 that selects and outputs the call signal of each time slot stored in the register group 6 under the control of the control unit (CONT) 7 for each time slot; The adder circuit (ADD) 9 selects a selector 8, adds a plurality of call signals, and outputs the sum to the time division switch circuit 2.

For each time slot, the selector 8 determines which time slot the other callers participating in the conference to which the caller to whom the time slot is assigned belongs is assigned, and the call signal of that time slot. Which register 6a of the register group 6?

The control unit 7 instructs whether the call signal is stored in the register group 6, 6b or 6n, and accordingly, the call signal is selectively read out from the register group 6. By controlling the selection of call signals in this manner, the adding circuit 9 performs the following for each time slot:
Call signals from other callers (telephone 5) participating in the conference to which the caller to whom the time slot is assigned belong are summed and synthesized, and this signal is sent to the time slot via the time division switch circuit 2. will be given to the assigned caller. This control is sequentially and repeatedly executed for each time slot.

Therefore, for example, as shown in Figure 6, from "0" to "31"
``In a time division exchange where one frame is made up of 32 time slots, caller A.

A conference call (#1) is held by assigning B and C to time slots "0"1" and 2", and at the same time, callers E and F are assigned to time slots "3" and 4111 "5". When making a conference call (#2), the conference call device 3 operates as follows.

That is, in time slot "O", time slot 111
11 Combine the call signals from callers B and C inserted into "2" and send to caller A. Next time slot “1”
Now, the speech signals from parties C and A inserted in the evening slot "2""θ" are combined and sent to party B. And in time slot “2”, time slot “
j □I+ 1 The call signals A and B from callers A and B inserted into "1" are combined and sent to caller C.

A conference call between callers A, B, and C is performed by such control.

In addition, in time slots "3" to 11511, the caller
Similar communication signal exchange control is performed between E and F. This conference call between callers A, B, and F will be held by callers A, B, and C.
This will be done independently of any conference call between.

However, in such a conventional conference call device, time-division multiplexed call signals are sequentially stored in a register group 6, and then selected via a selector 8 to perform conference calculations. It is desirable that the time slots assigned to multiple callers are consecutive. If the time slots are discontinuous, the selection control of the call signal by the selector 8 becomes unnecessarily complicated, and the burden on the control section 1 becomes significant.

For this reason, if the number of conference participants increases, for example, conference #1
When caller K participates in conference #2, the time slot for this caller is assigned to "P3", and the time slots for callers E and F who participated in conference #2 are shifted by one to "4".
“I am trying to assign it to 51111611.

However, such time slot allocation changes
In addition to placing a heavy burden on the control section 7, this also resulted in problems such as the generation of click sounds due to the change of time slots. Therefore, in order to cope with the increase in the number of conference participants without causing the above-mentioned problems, it has been considered to prepare a sufficient number of time slots for each conference in advance. However, if such measures are taken, there will always be idle time in the processing of the conference call device 3.
There was a problem in terms of effective use of the conference call device 3.

[Purpose of the invention]

The present invention has been developed in consideration of these circumstances, and its purpose is to easily enable conference calls between arbitrary time slots and to sufficiently cope with the increase in the number of conference participants. The purpose of the present invention is to provide a conference call device that can perform conference calls.

(Summary of the Invention) The present invention writes time-division multiplexed speech signals into a path memory for each time slot, accumulates one frame worth of speech signals in the path memory, and The call signals of the time slots of other callers participating in the conference to which the caller to whom the time slot is assigned are stored in each of the memory areas of the control memory, each of which has memory areas corresponding to the slots. The address information of the path memory registered in each of the memory areas of the control memory is sequentially read out for each time slot within the time slot time. The path memory is accessed, and the call signals sequentially read out from the path memory by this access are cumulatively added for each time slot and output.

〔Effect of the invention〕

Thus, according to the present invention, for each time slot, the call signal of each time slot stored in the path memory is sequentially read out according to the address information stored in the control memory,
By simply adding these signals within the time slot period, a conference-computed call signal can be obtained. Therefore, it becomes possible to easily and efficiently execute conference calculations between callers assigned to arbitrary time slots.

Also, the information of the conference participants registered in the memory area determined corresponding to each time slot of the control memory (information on the storage address in the path memory of the call signal of the conference participant stored in the path memory) is changed. You can change (increase or decrease) the number of participants in the conference by simply Therefore, there is no need to prepare time slots in advance for each conference, and the conference call device can be operated efficiently. Moreover,
Changing conference participants without incurring a burden on its control unit (
It has great practical effects, such as making it possible to increase or decrease the amount of water.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an embodiment device. Pass memory 1
Reference numeral 1 is connected to the PCM highway of the time division switch circuit 2 to input time division multiplexed speech signals transmitted on the PCM highway. This path memory 11 is write-accessed by an address signal given from a counter 13 via a selector 12, and each call signal (
PCM signals) are sequentially written to a predetermined address for each time slot and accumulated over one frame period.

The writing of the speech signal of each time slot into the path memory 11 is performed, for example, by sequentially writing the speech signal for each time slot to an address having a value equal to the time slot number, as shown in FIG.

On the other hand, the control memory 14 stores readout address information of call signals for the path memory 11, and the address information accessed and read by the counter 13 via the selector 15 is transferred to the path memory 12 via the selector 12. 11, and controls the reading of call signals from the path memory 11. This control memory 14 includes a memory area corresponding to each time slot, and stores information from all callers other than the caller who participated in the conference to which the caller to whom the time slot is assigned belongs in each of these memory areas. Address information of the path memory 11 in which call signals are stored is stored. That is, the time slot numbers (storage address information for call signals in the path memory 11) assigned to each of the other conference participants who participated in the same conference are stored in the memory corresponding to the time slot, as shown in FIG. 3, for example. It is stored in each area.

The write circuit 16 controls writing of the address information to each memory area of the control memory 14,
When conference participants are determined or when there is a change in the participants, the information write address of the control memory 14 is designated via the selector 15, and the address for the path memory 11 is assigned to that address. Writing information.

For example, as shown in FIG. 2, callers A and B out of 32 time slots consisting of "'0" to "31".

Time slots 110""1"°" for C9~F respectively
2'' to 5'' are assigned, and the call signal of each of these time slots is sent to addresses (0) (1) (2) to (5) corresponding to each of the above time slots on the path memory 11.
). Further, the control memory 14 is set so that, for example, the maximum number of callers who can participate in one conference is seven, and each memory area is divided into six addresses in order. In other words, the memory area on the control memory 14 corresponding to time slot "0" (caller A) is set to address (0) ~
(5), and the memory area on the control memory 14 corresponding to time slot "1" (caller B) is defined as addresses (6) to (11). Similarly, the memory areas on the control memory 14 corresponding to time slot 2'' (caller C) are defined as addresses (12) to (17).

When a conference call is to be held between these callers A, B, and C, addresses (0) to (5) of the memory area corresponding to time slot 0'' (caller A) of the control memory 14 are used.
Information (1) and (2) of addresses where the call signals of other callers B and C are stored on the path memory 11 are sequentially written in . In this case, of the six addresses in the memory area, only two addresses (0) (1) are used for storing address information in the path memory 11. The remaining four addresses (3) to (5) contain address information (
FF), etc., to prevent erroneous read access to the path memory 11.

Similarly, time slot "1" of control memory 14
Address (6) of the memory area corresponding to (caller B) ~
In (11), information (0) and (2) of the addresses where the call signals of callers A and C are stored are written in order, and the memory area corresponding to time slot "2" (caller C) is written in order. Addresses (12) to (17) include callers B and C.
Information on the address where the call signal is stored (0) (1)
are written in order.

The counter 13 repeatedly accesses the control memory 14 in which the address information of conference participants is registered in each memory area at high speed for each time slot, and records the information stored in the memory area corresponding to the time slot. A plurality of pieces of address information are sequentially read out within the time slot period.

The address information sequentially read out from the control memory 14 is given to the path memory 11 via the selector 12, access to the path memory 11 is controlled, and the call signals stored in each time slot are sequentially read out. .

Such access control of the path memory 11 is performed by, for example, 1
As mentioned above, the maximum number of participants in one conference is set at seven, so for example, as shown in Figure 4, one time slot period is divided into seven, and the first period is used as the call time for that time slot. The remaining six periods are used to write signals into the path memory 11, and the remaining six periods are used to read out call signals from the path memory 11.

That is, in each time slot, the call signal input to that time slot is first written to the address corresponding to the time slot in the path memory 11, and then sequentially read from the memory area corresponding to the time slot in the control memory 14. The call signals of each time slot stored in the path memory 11 are selectively and sequentially read out using the address information of the path memory 11 stored in the path memory 11.

The call signals sequentially read out from the path memory 11 are input to the adding circuit 17. The adder circuit 17 has 111
By inputting the output of the register 19, which temporarily stores the output under the control of the 6!1 circuit 18, as a feedback input, the cumulative addition value of the speech signals sequentially read out during the one time slot period is determined. The signal obtained through this addition process is output as a conference-processed call signal to the caller to whom the time slot is assigned.

Therefore, in the example shown in FIGS. 2 and 3, the caller A
In the time slot assigned to , the call signal from the caller is written to address (0) of the path memory 11,
After that, the path memory 11 reads out the call signals from callers B and C respectively stored in the address (1) < 2) specified in the 11i1J Ill memory 14, and the summed signals are used as the call signal. It will be given to Person A. Similarly, in the time slot assigned to caller B, the call signal from caller B is written to address (1) of path memory 11, and then from path memory 11 to the address specified in control memory 14. (
0) The call signals from callers A and C respectively stored in (2) are read out, and the summed signals are given to caller B. Similar processing is performed for the time slot assigned to party C, and thereafter the above-described processing is repeatedly performed for each time slot.

By the function of such a conference call device, the above-mentioned caller A
, B, and Cl1l will be held efficiently.

By the way, if caller G assigned to time slot "31" participates in a conference being held between callers A, B, and C, the address information registered in the control memory 14 will be changed as follows. It is done like this.

That is, in this case, it is necessary to add the call signal of caller G assigned to time slot "31" and execute the above-mentioned conference calculation, and the call signal of caller G is stored in address (31) of path memory 11. address information (31) is additionally registered in the memory area of the control memory 14 corresponding to caller A (time slot O'').Similarly, address information (31) is additionally registered in the memory area corresponding to caller A (time slot “1”
Address information (
31) is additionally registered. The memory area (addresses (186) to (191)) on the control memory 14 corresponding to the time slot "31" assigned to caller G contains information about other callers A, B, and others participating in the conference. The address information (0
) (1) and (2) are registered respectively.

By such additional registration of address information in the control memory 14, in the time slot "OII", caller B,
In addition to the call signal from caller C, the call signal from caller G is also read out during that time slot period, and the signal obtained by performing the conference calculation on these call signals as described above is sent to caller A.
will be given to and time slot “1”
Also in "2", conference calculations are performed in which the call signal from caller G is added, and in addition, time slot "31"
Then, a signal obtained by performing conference calculations on the call signals of callers A, B, and C is given to caller G.

In this way, according to the present device, the time slot numbers of the callers participating in the conference (information on the storage address of the call signal from each caller stored in the path memory 11) are stored in the time slot number assigned to each caller. Control memory 1 corresponding to slot
By simply storing the information in the four memory areas, it becomes possible to easily conduct a conference call between them. Moreover, even if any time slot is assigned to these callers, the address of the path memory 11 where the call signal of that time slot is stored is specified and the call signal is read out within the time slot period. conference calls between these callers can be easily carried out. In addition, as mentioned above, the number of participants in a conference can be easily increased, and for this reason there is no need to change the time slots of call signals that are time-division multiplexed, and there is no clicking sound caused by changing the time slots. Great effects such as these can be achieved.

Moreover, as mentioned above, since it is only necessary to change and control the address information of the path memory 11 registered in the control memory 14,
The conference calls are easy to manage and easy to control.

Therefore, it is possible to efficiently operate the conference call device and realize an effective conference call without imposing a burden on the control unit.

Note that the present invention is not limited to the embodiments described above. For example, the number of time slots constituting one frame of a call signal to be time-division multiplexed, the number of callers allowed to participate in one conference, etc. may be determined according to the specifications. Then, the number of addresses of the memory area corresponding to each time slot to be set in the control memory 14 may be determined according to this specification.

In addition, the present invention can be implemented with various modifications without departing from the gist thereof.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a path memory 11 in the same embodiment, FIG. 3 is a configuration diagram of a control memory 14 in the same embodiment, and FIG. A diagram showing the write/read control timing of the path memory 11 by time slot division, FIG. 5 is a diagram showing the configuration of a time division switch and a conventional conference call device, and FIG. 6 is a diagram showing time slot assignment in a conventional conference call. FIG. 1... Central control unit (CPU), 2... Time division switch circuit (TSW), 3... Time division conference device, 4...
・Subscriber circuit (LC), 5...Telephone 5.6...Register (REG) group, 7...Control unit (CONT), 8
... Selector (SEL), 9... Addition circuit (ADD)
), 11...Path memory, 12.15...Selector, 13...Counter, 14...Control memory, 16.
...Write circuit, 11...Addition circuit, 18...Control circuit, 19...Register. Applicant's agent Patent attorney Takehiko Suzue Figure 4 Figure 112 Figure 3

Claims (2)

[Claims] (1) A path memory for storing time-division multiplexed call signals one frame at a time, and a memory area corresponding to each time slot of the frame, and each time slot is assigned to each of these memory areas. a control memory for registering address information on the path memory in which call signals of other callers participating in the conference to which the caller belongs; accessing the path memory by sequentially reading the address information of the path memory in each time slot within the time slot time;
A conference call characterized by comprising means for sequentially reading out the call signals registered in the path memory, and means for cumulatively adding and outputting the call signals sequentially read out from the path memory for each time slot. Device. (2) For each time slot, the path memory sequentially writes the call signal to the address corresponding to that time slot and reads the call signal stored in the address accessed by the control memory within one time slot period. The conference call device according to claim 1, wherein the conference call device performs the following operations.