JP2524996B2 - Conference Trunk Control Method in Digital Network - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a channel control method for a telephone conference circuit in a digital telephone exchange system.

(Prior Art) FIG. 2 is a block diagram of a conventional telephone conference exchange system.

In the figure, SPM is a channel memory as a digital network, HM is a holding memory as a digital network, CNF0 and CNF1 are conference trunk circuits and R, respectively.
HW is a receiving highway and SHW is a transmitting highway.

The call path memory SPM receives the call data from each subscriber by the receiving highway RHW and sends the call data from the terminals m, n to the conference trunk circuits CNF0, CNF1 based on the designation of the holding memory HM. , Conference trunk circuit CNF
The call data sent from 0, CF1 is received at the terminals m ', n', and based on the designation of the holding memory HM, the transmission highway
Send to each subscriber via SHW.

FIG. 3 shows an array of data in the holding memory HM. Subscriber channel numbers S1 to Sn on the receiving side are specified in the address ADD, and the other party of the call corresponding to the channel numbers S1 to Sn in the data section DATA. A call channel NW, etc., which designates is stored. Addresses M1 to M4 are four-way conference trunk circuit CN
Each connection terminal number of F0 is assigned, and its data part DATA
Accommodates subscriber channel numbers A, B, C, D of the conference group of the conference trunk circuit CNF0. And addresses N1-N
The connection terminal numbers and the like of the four-party conference trunk circuit CNF1 are assigned to 4, and the conference trunk CNF1 is assigned to the data portion DATA.
Subscriber channel numbers F, F, G, H of the conference group of are accommodated.

FIG. 4 shows an example of conventional channel designation data for call data, which is based on designation by the holding memory HMT. The upper 2 bits of the address ADD are conference trunk circuits CNF0 and CNF.
, And the lower 2 bits specify the terminal number of each of them. And the data DATA is each subscriber channel number A, B, C, D, E, F, at the time of each writing by the reception highway RHW.
The subscriber channel numbers A ', B', C ', D', E ', F', G ', and H'when reading to G, H or the transmission highway SHW are shown.

The conference trunk circuits CNF0 and CNF1 have the same function, and FIG. 5 shows one conference trunk circuit CNF0.
FIG. 3 is a block diagram showing the configuration of FIG.

Referring to FIGS. 2 and 5, call data of each subscriber A, B, C, D sent from the terminal m of the call path memory SPM (hereinafter, A, B, C, D or A ', B). ′, C ′, D ′) is
It is written in each register AR, BR, CR, DR and sent to the adder circuit MIX. The adder circuit MIX converts each call data A, B, C, D (speech sound) into each addition formula A '= B + C + D, B' = A + C + D, C '.
= A + B + D, D '= A + B + C is added (combined) and sent to each register AS, BS, CS, DS, and as call data A', B ', C', D '(reception sound) of each subscriber, Call data A,
It is sent to the terminal m'of the speech path memory SPM at a timing delayed by one sampling period from B, C and D, respectively. Note that the conference trunk circuit CNF1 is similar to the communication path memory SP.
Upon receiving the call data of each subscriber E, F, G, H sent from the terminal n of M, the added call data E ′, F ′, G ′, H ′ is added to the terminal n ′ of the call path memory SPM. Send out.

FIG. 6 is a timing chart showing the operation of the circuits shown in FIGS. 2 and 5, and these call codes m, n, m ', n'are used as call data of the terminals m, n, m', n '. The numbers are shown according to the order of timing.

The call path memory SPM receives the call data of the subscribers A to H from the receiving highway RHW for each sampling period, adds them by the conference trunk circuits CNF0 and CNF1, and adds them from the sending highway SHW to the subscribers A'to H '. Send to. Here, it is assumed that two conference groups of subscribers A, B, C, D and E, F, G, H hold a conference, respectively, and the holding memory HM stores the respective data of FIG. It is assumed that the speech path memory SPM receives each speech path data A, B, C, D from the reception highway RHW at the timing when the upper 2 bits of the address ADD for the reception highway RHW in FIG. In response, the same timing (this is called timing m) is sent from the terminal m to each terminal of the conference trunk CNF0. The conference trunk CNF0 adds this, and at the timing when the upper 2 bits of the address ADD corresponding to the transmission highway SHW is indicated by 1,0, each call data A ', B',
The terminal m'receives C'and D ', and transmits to the transmission highway SHW at the same timing (this is called timing m'). In addition, each call data E, from the receiving highway RHW
Similarly, when receiving F, G, H, the upper 2 bits of the address ADD are sent from the terminal n to each terminal of the conference trunk CNF1 at the timing n of 1 and 1, and the call data E added by the conference trunk CNF1 is added. ′, F ′, G ′, H ′ is the communication path memory SP
It is received by the terminal n'of M and transmitted to the transmission highway SHW at the timing n'indicated by the upper 2 bits of 1, 1.

(Problems to be Solved by the Invention) However, in the above configuration, in order to increase the number of conference groups, the same number of conference trunk circuits as the number of groups are required, which causes a problem of increasing the amount of hardware. .

It is an object of the present invention to provide a method for controlling a telephone conference circuit that enables a plurality of conference groups to be exchanged using one conference trunk circuit.

(Means for Solving Problems) In order to solve the above problems, the present invention inputs input call data sent from each subscriber of each conference group into a conference trunk circuit via a digital network,
In the telephone switching system, the only conference trunk circuit is provided with a conference function for processing the call data and outputting it to the digital network as output call data received by each subscriber in association with a plurality of conference groups. When the conference trunk circuit of the above receives the input call data of one conference group of each conference group from the digital network at a predetermined reception timing, it receives the call data of another conference group received after one sampling period before the processing. The output call data is output to the digital network, and the input / output of the call data of each conference group is completed in time series within the sampling period of the digital network for each conference group.
The call data of multiple conference groups was processed within the sampling period.

(Operation) According to the present invention, when the conference trunk circuit receives the call data of the one conference group from the digital network at the designated reception timing, the call data added by the other conference groups is sent to the digital network. To do.

(Embodiment) FIG. 1 is a block diagram of a telephone conference exchange system showing an embodiment of the present invention. In the figure, parts equivalent to those in FIG. 2 are designated by the same reference numerals, and description thereof will be omitted as appropriate.

The CNF is a conference trunk circuit, which forms a single conference trunk circuit having the same configuration as the circuit of FIG. And holding memory
HM has the same sequence as the above-mentioned third data sequence.
FIG. 7 is a diagram showing an example of channel designation data of call data. As shown in FIG. 7, by sequentially rewriting the address ADD of the holding memory HM within the sampling period, the input timing (reception) to the conference trunk circuit CNF is received. Timing) m, call data A, B of the first conference group,
Input C and D, and output call data E ', F', G ', and H'of the second conference group. Then, by sequentially rewriting the address ADD of the holding memory HM within the sampling period, the call data E, F, G, H of the second conference group is input to the conference trunk circuit CNF at the input timing (reception timing) n. Along with
Call data A ′, B ′, C ′ of the first conference group,
D'is output. As in the case of FIG. 4, when the upper 2 bits of the address ADD are 1,0, the call data (A, B, C, C) is input to the conference trunk circuit CNF at the input timing m for the reception highway RHW. D) is input, and transmission highway SHW is specified to output each call data (A ', B', C ', D'one sampling cycle before), and when the upper 2 bits are 1, 1 Similarly, each call data (E, F, G, H) is input at the input timing n, or each call data (E ′, F ′, G ′, one sampling cycle before) is input.
H ') is specified to be output.

 Next, the operation of the above configuration will be described.

FIG. 8 is a timing chart of the operation of the system shown in FIG.

When the call path memory SPM receives the call data A, B, C, D from the reception highway RHW, at the input timing m2,
Input from the terminal m to the conference trunk circuit CNF. The conference trunk circuit CNF receives the call data E received from the terminal n after one sampling period before at the timing n1 ′,
The addition data E ', F', G ', H'of F, G, H are stored in the channel memory S.
Output to terminal n'of PM. The speech path memory SPM is A ′, B ′, C ′, D ′ which is added by the conference trunk circuit CNF receiving the speech data A, B, C, D from the terminal m one sampling period before.
At the output timing m1 'to the terminal m'of the transmission highway SHW.

In this way, the conference trunk circuit CNF allows the input call data A to H and the output call data A'to each conference group.
Each input / output of H'is completed in time series within one sampling period.

FIG. 9 is a diagram showing an example of data replaced with FIG. 7, in which a storage field of the holding memory HM is added to further add each subscriber I, J, K, L in the addition processing of the conference trunk circuit CNF. The conference group addition process is performed based on the designation of 0 and 1 of the upper 2 bits, and one conference trunk circuit CNF enables communication of three conference groups.

As described above, according to the present invention, when the conference trunk circuit inputs the call data for transmission of one conference group, it outputs the call data for reception of another conference group and outputs the time series. Since the addition processing is performed by the above, the conference call of multiple conference groups can be performed using a single conference trunk circuit by simply rewriting the control bit of the input / output timing as the upper bit without increasing the hardware amount of the conference trunk. The circuit can be controlled.

[Brief description of drawings]

FIG. 1 is a block diagram of a telephone conference switching system showing an embodiment of the present invention, FIG. 2 is a block diagram of a conventional telephone conference system, FIG. 3 is a data array diagram of a holding memory, and FIG. 4 is a conventional telephone call. FIG. 5 is a block diagram of the conference trunk circuit, FIG. 6 is a timing chart of the operation of the system of FIG. 2, and FIG. 7 is a diagram showing channel designation of call data according to the present invention. FIG. 8 is a timing chart of the operation of the system shown in FIG. 1, and FIG.
It is a figure which replaced with the figure and which shows the channel designation of the call data. SPM: Caller memory (digital network) HM: Holding memory (digital network) CNF: Conference trunk circuit RHW: Receive highway (call path) SHW ... Transmit highway (call path)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Go Hinuma Oki Electric Co., Ltd. 4-11-22 Shibaura, Minato-ku, Tokyo Bekkan Oki Communication System Co., Ltd. (56) Reference JP-A-61-96858 (JP, A) ) JP-A-62-195967 (JP, A)

Claims (1)

(57) [Claims] 1. Input call data sent from each subscriber of each conference group is input to a conference trunk circuit via a digital network, and the only conference trunk circuit processes the call data, and each subscriber In a telephone switching system provided with a conference function for receiving output call data and outputting to a digital network in association with a plurality of conference groups, the only conference trunk circuit is from the digital network to one conference of each conference group. When the input call data of the group is received at a predetermined reception timing, the output call data of the call data of the other conference group received after one sampling period before the processing is output to the digital network, and each conference group is output. Within the sampling period of the digital network A method of controlling a conference trunk in a digital network, characterized in that the input / output of call data of each conference group is completed in time series, and the call data of a plurality of conference groups are processed within a sampling period.