JPS6147457B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simultaneous broadcast communication device in a facsimile system, etc., which simultaneously transmits the same information from one transmitter to multiple receivers connected via multiple communication lines. be.

In recent years, various communication terminal devices other than telephones have been developed, and they are connected to public communication networks or private communication networks.
We carry out various forms of communication. In order to improve communication quality and reliability, these communication terminal devices often communicate control signals specific to the device between the transmitter and the receiver, in addition to information that is originally intended to be transmitted.

For example, when it comes to facsimile devices as communication terminals, there are models that have a defined control procedure such as the "CCITT G" standard. Next, the operation of the G standard facsimile machine will be briefly explained.

The meanings of the signals shown in FIG. 1 are as follows. The facsimile transmitter→receiver indicates that the transmitter T sends a calling signal IR to the receiver R, and the reverse case is the facsimile receiver→facsimile receiver, indicating that the response signal AS is sent.

GI……Indicates the mode in which the receiver can receive data (R→
T).

GC...Indicates transmission mode. The receiver must receive in the mode specified by GC (T→
R).

PHS...Indicates phase signal. The receiver receives the PHS and performs phase alignment (T→R).

CFR...Indicates that the receiver has completed phase alignment and is ready for reception (R→T).

VID...Indicates image information to be transmitted (T→R).

EOM...Indicates the end of image information transmission (T→R).

MCF...Indicates that receiver R has completed receiving one page of image information (R→T).

In the operation diagram of FIG. 1, first, when a selective calling signal IR is sent from a facsimile transmitter T to a facsimile receiver R, the called facsimile receiver is called by a procedure known in the art for telephone connection, etc.
When the receiver R responds, a response signal (polarity inversion signal) AS is sent from the communication line to the facsimile transmitter, and line setting is completed.

After the line is set up, the facsimile receiver R
Sends GI signal. The facsimile transmitter T receives and detects this GI signal, and if it is a facsimile receiver that can receive the transmitted signal, it will receive the signal within a certain period of time.
Sends GC signal and then sends PHS signal.
The facsimile receiver R receives the GC signal, sets the reception mode to the transmission mode, receives the PHS signal, and performs phase matching. When the phase alignment is completed and preparations for receiving the image signal are completed, the CFR signal is transmitted. When the facsimile transmitter receives the CFR, it sends out an image signal, and when it has finished sending out the image signals for one page of the transmitted original, it sends out the EOM signal following the image signals. The facsimile receiver R receives the image signal,
When it receives an EOM signal, it sends out an MCF signal, and after a certain timing, it sends out a GI signal in preparation for the next reception. The facsimile transmitter T receives the MCF signal and recognizes that the image signal for one page has been correctly received. It continues to receive the GI signal, and if there is a second page of the original to be transmitted, it sends out the GC signal and repeats the above operation. When the facsimile receiver R cannot receive the GC signal within a certain period of time, it abandons reception and returns to the initial state.

The transmission timing, transmission time, and reception time of the various signals shown in Figure 1 are predetermined, and if it is not possible to receive the determined signal within the predetermined time, the facsimile transmitter and receiver will each Abandon transmitting and receiving operations and return to the initial state.

When connecting a facsimile device with such a control procedure to a communication network and broadcasting from one facsimile transmitter to multiple facsimile receivers, there are some lines that cannot be set up to improve transmission efficiency. Image signals are transmitted even when there is a line where communication of control signals is not good. Therefore, there is a drawback that it is not possible to distinguish between a line on which an image signal could be received correctly and a line on which the image signal could not be received.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a simultaneous broadcasting device that can display whether or not a signal has been received for a plurality of receivers.

The present invention includes a polarity inversion signal detection circuit corresponding to a line,
A circuit is provided to detect part or all of the control signal sent from the receiver, and if the output of the detection circuit indicates that the transmitted information cannot be correctly received by the receiver, the line is released by the output of the detection circuit. However, the communication with the receiver is stopped, and a message indicating that the transmission could not be transmitted is displayed.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.

FIG. 2 is a block diagram showing an example of the system configuration of a broadcast service, FIG. 3 is a specific circuit configuration diagram of a broadcast system according to the present invention, and FIG. FIG. 2 is a circuit configuration diagram showing more specifically a part of the circuit of the simultaneous broadcasting device.

In FIG. 2, T is a facsimile device having a transmitting function, R1 to R5 are facsimile devices having a receiving function, and NW is a communication line network. DT is a simultaneous broadcasting device according to the present invention, and is a facsimile device T.
and the communication line network NW. According to the configuration shown in FIG. 2, one facsimile transmitter T
From there, the same information is simultaneously transmitted to a plurality of facsimile receivers R1 to R5 via a broadcasting device DT and a communication line network NW. Further, in FIG. 3, the same reference numerals as in FIG. 2 indicate the same parts. In Figure 3,
NCU1 to NCUn are network control circuits for setting or opening communication lines, AMP1 to AMPn are amplifiers, AD is auto dial circuit, DET1 to DETn
3 is a detection circuit for detecting a control signal sent from the receiver, which is not shown in FIG. Signal sources a, b, c1~ of the same type as the control signal sent out from the receiver
cn, d1 to dn are relay contacts not shown,
CONT is the control circuit, JKL is the operation panel, LAMP1~
LAMPn is a lamp provided for line support.

Further, in FIG. 4, the same reference numerals as in FIG. 3 indicate the same parts. In Figure 4, E and L are relays, and D0
1, D02 is a diode, LEV is a level conversion circuit, COUNT is a counter, TIM is a timer circuit, e
is a contact of relay E, L1, L2, and L3 are AND circuits, and L4 is an OR circuit. L5 is memory,
Tr indicates a transistor, and +V indicates a power supply.

Next, the operation will be explained using FIGS. 3 and 4. First, set the reception destination for each line on the operation panel JKL and start it. Control circuit CONT is the operation panel
Based on JKL information, each network control circuit NCU1~NCUn
A dial pulse is sent from the auto dial circuit AD. When the communication line network NW receives the dial pulse, it calls the receiver using a known procedure, and when the receiver responds accordingly, it sends back a polarity inversion signal (hereinafter referred to as reverse signal) to the transmitter.
When the broadcasting device DT receives the reverse signal,
Relay L is restored and relay E operates. When relay E operates, its contact e opens, and if the release time of contact e is within the predetermined time specified by timer TIM, the logical condition of AND circuit L3 is satisfied, and OR circuit L4 is opened. through memory L5
Reset. Further, if contact e does not operate within a predetermined time, the logical condition is not satisfied and memory L5 is set. When the memory L5 is set, the lamp LAMP1 is turned on via the transistor Tr, but when it is reset, it is turned off. on the other hand,
When the memory L5 is set, a relay P (not shown) is operated by the output signal of the memory L5, and its contact p is released to release the line.

If the reverse signal is also received within a predetermined time and the line setting is completed, the contact c1 of the line that received the reverse signal is closed via the control circuit CONT, a hold signal is sent from the hold signal source S1, and a response is received. receiver R is temporarily put on hold. The above-mentioned operation from dial pulse sending to receiver hold is repeated on other multiple lines, and after a certain period of time after all lines are connected, relays C1 to Cn (not shown) are restored all at once, and the hold signal is stopped. Then, multiple receivers are started from the same state all at once. Here, the explanation will be continued using an example in which the sequence starts from the GI signal transmission state shown in FIG. 1 above.
In preparation for receiving the GI signal from the receiver, the control circuit CONT operates relays D1 to DN (not shown) to switch the contacts d1 to dn to the detection circuits DET1 to DETn. When the GI signal is sent out from the receiver, it is guided to the detection circuit DET1 via the communication network NW, contact p, and contact d1. Detection circuit DET1
converts the GI signal to a certain level using the level conversion circuit LEV, observes the frequency of the incoming signal using the counter COUNT for the time specified by the timer TIM, and determines whether it is a GI signal. If it is a GI signal, its
The logic circuit L1 detects whether the GI signal has arrived within the time specified by the timer TIM, and stores the result in the memory circuit L5 in the same procedure as when receiving the reverse signal described above. When the GI signal cannot be received, the lamp LAMP1 is lit and the line is released. Also, when a GI signal is received, the control circuit
CONT restores contacts d1 to dn, then contacts s
2 and sends a GI signal from the broadcasting device DT to the transmitter T. When transmitter T receives the GI signal,
As explained in FIG. 1, the GC signal and PHS signal are sent out. On the other hand, upon receiving the GC signal and PHS signal, the receiver transmits the CFR signal. Accordingly, when the transmitter T receives and detects the CFR signal in the same sequence as the reception of the GI signal, it proceeds to the next sequence, and when it cannot detect it, it proceeds to the next sequence as shown in Figures 3 and 4. Displays the lamps (LAMP1 to LAMPn) corresponding to the line and disconnects the line. Reception of MCF signals is also performed in exactly the same sequence. In the sequence described above, the same information is sent from the transmitter T to multiple receivers R all at once, and the line that must be retransmitted because the line cannot be set or the control signal cannot be exchanged is the lamp LAMP1 mentioned above. ~
Display by LAMPn.

In the above embodiment, an example was explained in which all control signals sent from the receiver are detected, but a method of detecting only some particularly important signals, such as PHS signals, is also sufficient to achieve the purpose of the present invention. is achievable.

As explained above, according to the present invention, if at least one receiver among the plurality of receivers continues to communicate in a normal sequence, the transmitter also continues to operate normally, and even when a receiver becomes unable to communicate in the middle, the transmitter continues to operate normally. As for machines, the lines are released and communication is stopped, and the operator is notified of this through display means installed for each line, which increases the transmission completion rate and reduces communication. If this is not possible, it can be easily known, and there are advantages in that it is economical, such as not holding the line unnecessarily.

[Brief explanation of the drawing]

The attached drawings are for explaining one embodiment of the present invention, and FIG. 1 is a diagram explaining a control procedure of a facsimile device, and FIG. 2 is a line system diagram of a simultaneous broadcast system in a facsimile device to which the present invention is applied. FIG. 3 is a specific circuit configuration diagram of the simultaneous broadcasting device shown in FIG. 2, and FIG. 4 is a circuit configuration diagram showing a part of the circuit shown in FIG. 3 in detail. T...Facsimile transmitter, R, R1 to R5...
...facsimile receiver, DT...broadcast device,
NW...Communication line network, S1-S3...Signal source,
AMP1~AMPn...Amplifier, NCU1~NCUn...
...Network control circuit, DET1 to DETn...Control signal detection circuit, CONT...Control circuit, AD...Auto dial circuit, TIM...Timer circuit, COUNT...Counter, JKL...Operation panel, LAMP1 to LAMPn...
…lamp.

Claims (1)

[Claims] 1 Broadcasting in which a broadcasting device is installed between a transmitter and a communication line network in a facsimile communication system, etc., and the same information is simultaneously transmitted from the transmitter to multiple receivers via the broadcasting device and multiple communication lines. The device includes a polarity reversal signal detection circuit in the broadcast device;
A control signal detection circuit that detects part or all of the control signal sent from the receiver and a display circuit that displays whether or not the receiver side has correctly received the transmitted information are provided for each line, and A common timer circuit is provided, and after the selection signal such as a dial pulse is sent, the polarity inversion signal and the control signal sent from the receiver cannot be detected by the detection circuit within a predetermined timing determined by the timer circuit. , a simultaneous broadcast communication device characterized in that it releases a line corresponding to the line and activates a display circuit provided for the line.