JPH06113100A - Multi-address calling controller for controlling simultaneous multi-address calling - Google Patents

Abstract

PURPOSE:To perform simultaneous multi-address calling by using one line of a transmission terminal station. CONSTITUTION:When a simultaneous multi-address selecting signal from a transmitter 1 is detected by a PB detection circuit 24, the control part 25 of a multi-address controller 2 is in a simultaneous multi-address control state. Corresponding to an output of a loop detection/pole change detection circuit 15 and an output of a demodulator 17, transmission of preamplifier signals from a preamplifier signal generation circuit 19 to the line 5, transmission of pseudo response signals from a pseudo response circuit 18 to the transmitter 1 and related relays 10, 11, 12 and 13 are controlled. Transmission signals of the transmitter 1 are transmitted through an internal signal path 31 to the line 5, however, input signals from the line 5 are not transmitted to the transmitter 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast control device for controlling simultaneous broadcast communication such as a G3 facsimile machine.

[0002]

2. Description of the Related Art Conventionally, a G3 facsimile broadcasting device capable of simultaneous broadcasting communication using a telephone line or the like has been known.
This accommodates a plurality of lines, and in the case of simultaneous broadcast, each broadcast destination and separate lines were used to connect and communicate simultaneously. Regarding this type of broadcast device, a method is known in which all broadcast destinations are synchronized by sending a hold signal to each broadcast destination (Japanese Patent Laid-Open No. 54-159120).

[0003]

However, according to the above configuration, when the number of simultaneous broadcast destinations is increased, the number of accommodated lines increases, which not only increases the line cost but also corresponds to the line of the device. Due to the large scale of the circuit system, the device must be extremely complicated and expensive.

The present invention has been made in view of the above problems, and provides a broadcast control device for realizing simultaneous broadcast communication with a large number of receiving terminals using one line accommodated on the transmitting terminal side. It is intended to be provided.

[0005]

At present, a communication line network (such as the satellite communication line network of Kokusai Telegraph and Telephone Co., Ltd.) capable of one-to-many connection such as a G3 facsimile machine is available.
In order to achieve the above-mentioned object, the present invention provides a broadcast control device to be interposed between a communication network capable of such a one-to-many connection and a transmitting terminal. The apparatus includes means for generating a pseudo response signal in place of the response signal from the receiving terminal and transmitting it to the transmitting terminal, means for transmitting the transmitting signal of the transmitting terminal to the communication network, and detecting the transmitting signal of the transmitting terminal. And a means for controlling the generation and transmission of the pseudo response signal.

[0006]

Therefore, according to the present invention, the transmission terminal accommodates one line by interposing the above-mentioned broadcast control device between the transmission terminal and the communication line network capable of one-to-many connection. Only, that is, by providing a line-corresponding circuit system for one line, simultaneous broadcast communication to a large number of receiving terminals can be performed.

In the case of simultaneous broadcast communication, a one-to-many connection is made with a receiving terminal of a broadcast destination by a communication line network, and a transmitting terminal sends out a control signal in a communication procedure and an information signal such as an image signal. . This signal is transmitted to the communication network by the broadcast control device and transmitted to each receiving terminal via the communication network. A response signal is sent from each receiving terminal, but a pseudo response signal replacing this response signal is sent from the broadcast control device to the sending terminal, and the sending terminal considers this pseudo response signal as a response signal from the receiving terminal. And proceed with the communication procedure.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic block diagram of a facsimile simultaneous broadcasting communication system to which the present invention is applied. In FIG.
1 is a G3 facsimile machine on the transmitting side (hereinafter abbreviated as transmitter), 2 is a broadcast controller according to an embodiment of the present invention,
3 is an exchange of the communication network 7 capable of connecting one-to-many with the G3 facsimile apparatus. Although only one exchange 3 is shown in the communication network 7 for simplification of the drawing, it is common that a plurality of exchanges 3 exist. Reference numeral 4 denotes a G3 facsimile apparatus (hereinafter abbreviated as a receiver) which is a destination of the simultaneous broadcast from the transmitter 1, and has n units. Reference numeral 5 denotes a line (one line) accommodated in the transmitter 1, and the broadcast control device 2 is inserted in this line 5 in series. Reference numeral 6 denotes each receiver accommodation line.

FIG. 2 is a schematic block diagram of the broadcast controller 2 according to an embodiment of the present invention. In FIG. 2, 10, 11, 12, and 13 are relays, 15 is a loop detection / reversal detection circuit for loop detection and reversal detection of the line 5, and 16
Is a power supply for supplying a loop current, 17 is a demodulator for demodulating a facsimile control signal sent from the transmitter 1, 18 is a pseudo response circuit for generating a pseudo signal of a response signal from the receiver 4, 19 Is a preamble signal generation circuit for generating a preamble signal (continuous CCITT Recommendation T.30 flag sequence). 20 and 21 are transformers, 23 is an amplifier that transmits signals only in the direction of the communication network 7, and 24 is a PB detection circuit that detects and decodes the broadcast push button (PB) signals sent from the transmitter 1. , 25 is a control unit for controlling the above-mentioned units, 26 is a DC cut capacitor, 30 and 31
Is an internal signal path.

Normally, the contacts of the relays 10 to 13 are in a state of being connected to the illustrated side (off state), and at this time, the internal signal path 30 becomes effective. That is, the transmitter 1 and the line 5 are directly connected. In the case of simultaneous broadcast operation, the contacts of relays 10 and 11 are switched to the state of connecting to the other side (on state) after the line is set, the internal signal path 30 becomes invalid, and the other internal signal path 31 is indirect. As a result, the transmitter 1 is connected to the line 5.

Next, the operation in the case where a call is made from the transmitter 1 and a broadcast is carried out to the n receivers 4 will be described. Figure 3
Shows the operation timing of the broadcast control device 2 in the case of simultaneous broadcast communication, and FIG. 4 shows an example of the signal sequence in the case of simultaneous broadcast communication. When the transmitter 1 goes off-hook and the push button is operated, *, #, etc. are input together with the facsimile number, and the selection signal (PB signal) 101 for simultaneous broadcasting with the n transmitters 4 is transmitted. . Since the relays 10 and 11 in the broadcast controller 2 are off, this selection signal 101 is sent to the line 5 through the loop detection / polarization detection circuit 15 and the internal signal path 30. At this time, the formation of the DC loop of the line 5 is caused by the loop detection / reversal detection circuit 15
Is detected by the control unit 25, and the broadcast selection signal 101 is detected by the PB detection circuit 24 to notify the control unit 25.
Since 5 is notified, the control unit 25 starts control of simultaneous broadcast. It is also possible to change the selection signal 101 to be sent from the broadcast controller 2.

The exchange 3 of the communication network 7 responds to the simultaneous broadcast selection signal 101 from the line 5 by each receiver 4 of the broadcast destination.
Call 102, and at the same time, the transmitter 1 is informed of the start of call by the polarity reversal 103 of the line 5. The transmitter 1 waits in a waiting state of CED (callee identification signal) and DIS (digital identification signal). In the broadcast control device 2, when the loop detection / reversal detection circuit 15 detects the polarity reversal 103, the control unit 25 which has received the notification controls the relays 10 and 11 to the on state.
As a result, the internal signal path 30 becomes invalid and no signal input from the line 5 is transmitted to the transmitter 1. The transformer 21 holds the loop of the line 5. The line loop current to the transmitter 1 side is supplied from the power supply 16.

Next, the control section 25 turns on the relay 13 and causes the preamble signal generation circuit 19 to generate the preamble signal 104. This preamble signal 1
04 is sent to the line 5 via the amplifier 23 and the transformer 21 of the internal signal path 31, and is sent to each receiver 4 via the communication line network 7. Each receiver 4 receives the CED 105 and DI when receiving a call.
Although S106 is returned, since the preamble signal 104 is received,
It waits in the state of waiting for DCS (digital command signal) from the transmitter 1. By transmitting the preamble signal 104 in this manner, G3 of the plurality of receivers 4 activated asynchronously
Since the start of the procedure can be almost synchronized, even if the start-up times of the receivers 4 vary widely, the subsequent procedure will be smoothly executed, and the receivers 4 having delayed start-up
There is a benefit that you can avoid such as timeout. However, the transmission of the preamble signal 104 is not essential.

CE, which is a response signal from the receiver 4,
D105 and DIS106 are stopped by the communication line network 7 and are not transmitted to the line 5 (the communication line network 7 is such a network). The same applies to subsequent response signals. However,
The response signal from each receiver 4 may be transmitted to the line 5. This is because the line signal in this direction reaches the transformer 21 in the broadcast control device 2, but is blocked by the amplifier 23 and is not transmitted to the transmitter 1.

The control unit 25 of the broadcast control unit 2 controls the polarity reversal 10
The elapsed time from the time when 3 is detected is counted, and at the time when a predetermined time τ necessary and sufficient to complete the startup of all the receivers 4 has passed, the relay 12 is controlled to the on state and the pseudo response circuit 18
After the CED 107 and the DIS 108, which are more pseudo response signals, are sequentially generated, the relay 12 is returned to the off state. The pseudo response signals CED107 and DIS108 are transmitted through the transformer 20, the capacitor 26 and the loop detection / polarization detection circuit 15 to the transmitter 1
Sent to. The transmitter 1 regards the pseudo CED 107 and DIS 108 sent from the broadcast control device 2 as response signals from each receiver 4, and sends out a DCS (digital command signal) 109,
Then, the TCF (training check signal) 110 is transmitted.

When the demodulator 17 detects the preamble of the DCS 109 from the transmitter 1, the control unit 25 of the broadcast controller 2 returns the relay 13 to the off state and stops the preamble signal generating circuit 19 to stop the preamble signal 104. Stop sending. The DCS 109 and TCF 110 are sent to the line 5 via the internal signal path 31 of the broadcast control device 2, and are therefore transmitted to each receiver 4 via the communication line network 7. Then, each receiver 4 sends out a CFR (reception preparation confirmation signal) 111 if it is ready for reception and enters a PIX (image signal) reception state, but this CFR 111 also does not reach the transmitter 1. Therefore, after a certain period of time, the transmitter 1 will restart the DCS 112 and TC.
Send F113. This is also transmitted to each receiver 4, and the CFR 114 is returned to it, but it does not reach the transmitter 1.

In the broadcast control device 2, the control section 25 secures a margin time for ensuring that all the receivers 4 are ready to receive, so that the control unit 25 sends the second D signal transmitted from the transmitter 1.
After detecting CS112 and TCF113 with the demodulator 17, relay
Controls 12 to the on state and controls the pseudo CF from the pseudo response circuit 18.
R115 is generated and sent to the transmitter 1, and then the relay 12 is returned to the off state. Transmitter 1 is a pseudo CFR115
Is regarded as a response signal from each receiver 4, and PIX
Transmission of (image signal) 116 is started. Since this PIX 116 is sent to the line 5 via the internal signal path 31, each receiver 4
Will be received at.

After the transmission of the PIX 116 is completed, the transmitter 1 transmits an MPS (multi-page signal) 117 when there is a document to be continuously transmitted. On the other hand, each receiver 4 is an MC
The F (message confirmation signal) 118 is returned, and the PIX reception state is resumed. However, since the MCF 118 is not transmitted to the transmitter 1, the transmitter 1 again sends out the MPS 119. Against this, the MCF 120 is returned from each receiver 4, but does not reach the transmitter 1.

The control unit 25 of the broadcast control unit 2 controls all receivers 4
In order to secure a margin time for surely receiving the next page document, the relay 12 is controlled to the ON state after the second MPS 119 is detected by the demodulator 17, and the pseudo response circuit
A pseudo MCF 121 is sent from 18. In this way, the response signal from the receiver 4 is not transmitted to the transmitter 1 at all, and the broadcast controller 2 generates a pseudo response signal and sends it to the transmitter 1 as described above. The variation of response time of multiple receivers 4 and overlap of response signals
This is to prevent obstacles due to (interference).

Now, the transmitter 1 uses this pseudo MCF121.
When is received, the transmission of the PIX 122 of the original on the next page is started. When there is no next original, EOP (procedure end signal) 123 is sent out. When the demodulator 17 detects this EOP 123, the controller 25 of the broadcast controller 2 turns on the relay 12.
After controlling the state to send the pseudo MCF 124 from the pseudo response circuit 18, the relay 12 is returned to the off state. Transmitter 1
Upon receiving the MCF 124, the DCN (line disconnection command) 125 is sent to disconnect the line. When detecting the DCN 125, the control unit 25 of the broadcast controller 2 turns on the relays 10 and 11.
Return to ff state. In addition, each receiver 4 receives the D from the transmitter 1.
When CN125 is received, the line is disconnected.

[0021]

As is clear from the description of the above embodiment,
By interposing the broadcast control device according to the present invention between a transmission line and a communication network capable of one-to-many connection,
Broadcast communication using one line accommodated by the transmitting terminal becomes possible. Therefore, the number of lines accommodated in the transmission terminal can be reduced to reduce the line cost, and the line corresponding circuit system of the transmission terminal can be downsized to reduce the device cost. Further, since the broadcast control device has a simple structure and can be realized at a relatively low cost, it has an effect that a broadcast communication system can be constructed at a low cost.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a facsimile broadcast communication system to which the present invention is applied.

FIG. 2 is a block diagram of a broadcast control device according to an embodiment of the present invention.

FIG. 3 is an operation timing at the time of simultaneous broadcast communication of the broadcast control device in the embodiment of the present invention.

FIG. 4 is an example of a signal sequence at the time of simultaneous broadcast communication of the broadcast control device in the embodiment of the present invention.

[Explanation of symbols]

1 ... Transmitter, 2 ... Broadcast control device, 3 ... Switch, 4
... receiver, 5 ... line, 6 ... receiver accommodation line, 7 ... communication network, 10, 11, 12, 13 ... relay, 15 ... loop detection / reversal detection circuit, 16 ... power supply, 17 ... demodulator, 18 ...
Pseudo response circuit, 19 ... Preamble signal generation circuit, 20,
21 ... Transformer, 23 ... Amplifier, 24 ... PB detection circuit,
25 ... Control part, 26 ... Capacitor for DC cut, 30, 31
… Internal signal path, 101… Selection signal, 102… Call, 10
3 ... Polarity reversal, 104 ... Preamble signal, 105, 107 ...
Called pole identification signal (CED), 106, 108 ... Digital identification signal (DIS), 109, 112 ... Digital command signal (DCS),
110, 113 ... Training check signal (TCF), 11
1, 114, 115 ... Reception preparation confirmation signal (CFR), 116, 122
... Image signal (PIX), 117, 119 ... Multi-page signal (M
PS), 118, 120, 121, 124 ... Message confirmation signal (M
CF), 123 ... Procedure end signal (EOP), 125 ... Line disconnection command (DCN).

Claims (1)

[Claims] 1. A broadcast control device which is interposed between a communication network capable of one-to-many connection and a transmission terminal and controls broadcast communication using one line accommodated by the transmission terminal. And a means for generating a pseudo response signal in place of the response signal from the receiving terminal and transmitting the pseudo signal to the transmitting terminal, a means for transmitting a signal transmitted from the transmitting terminal to the communication line network, and transmitting from the transmitting terminal Means for controlling the generation and transmission of the pseudo response signal by detecting a signal, and a broadcast control device for controlling broadcast communication.