JPS58181366A - Facsimile communication system - Google Patents

Abstract

PURPOSE:To hold a line at the transmission side, even if an original to be transmitted is absent, by transmitting a preamble signal repetitively to a control signal representing that a message outputted from a receiver is received correctly. CONSTITUTION:When a reserved switch of a transmitter is turned on, the transmitter transmits an EOP signal after the end of transmission of a picture signal of the final page, and when the receiver returns an MCF signal, a preamble signal is transmitted repetitively. In this case, a time (t) from the start of the preamble signal of each time to the start of the preamble signal of each time to the start of the preamble signal of the next time is made <=6sec. When the reserved switch of the transmitter is turned off, if no original exist through normal operation, a DCN signal is transmitted and the receiver interrupts the line. Thus, even if the original to be transmitted is absent, the line is reserved at the transmission side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a facsimile communication system in a facsimile machine corresponding to Group 3 of the CCITT recommendations.

The CCITT Recommendation does not particularly recommend instructions for putting the called party's line on hold in Group 3 facsimile equipment. For this reason, in the conventional Group 3 facsimile apparatus, when there are no documents to be transmitted on the sending side, the receiving side disconnects the line after going through the sequence shown in FIG.

That is, FIG. 1 is a conventional signaling diagram of the Phase D (post-message procedures, including message termination and confirmation and biplane documentation procedures) portion of the CCITT Recommendation, Group 3 facsimile equipment. Note that Table 1 shows a list of control signals and their functions in this specification and drawings.

Table 1 List of Control Signals To explain this, when the sending side runs out of documents to send, it sends out the RT C signal, then sends out the preamble signal, and then sends out the EOP signal.

On the other hand, if the message is correctly received, the receiving side sends out a preamble signal and then sends out an MCF signal. Always send a signal. As a result, the receiving side disconnects the line.

For this reason, in the past, the Group 3 facsimile machine would disconnect the line even when the number of documents to be sent was large and it was not possible to send them all at once, or when it was desired to wait for a short period of time until the documents were ready. In order to send the remaining transmissions, it was necessary to make another telephone call and reconnect the line, which had the disadvantage of being time-consuming.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and in a facsimile machine that complies with CCITT Recommendation Group 3, it is possible for the sending side to hold the line on the receiving side even if there are no documents to be sent. The purpose is to provide a facsimile communication method that can

In the facsimile communication system according to the present invention, even if there are no documents to be sent to the transmitter, if you want to put the line on hold,
In response to a control signal sent from the receiver indicating that the message has been correctly received, a preamble signal is sent to the transmitter from the start of each preamble signal to the next preamble signal. The data is repeatedly transmitted so that the interval up to the start point does not exceed a predetermined time.

The present invention will be explained in more detail below based on embodiments shown in the drawings.

FIG. 2 is a block diagram showing the facsimile system in this embodiment. In the figure, 1 is a transmitter, 2I/
'i: a line connection switching section provided in the transmitter 1; 3, a hold switch provided in the transmitter 1; 4, a line; 6, a facsimile receiver; 6, a line connection switching section provided in the receiver 6; be.

FIG. 3 is a signal system diagram of the phase D portion in this embodiment, and FIG. 4 is a flow diagram of the control procedure on the receiving side of the phase 0 portion in this embodiment.

This embodiment utilizes the fact that the CCITY recommendation is a command reception in phase D, and if the operator on the transmitting side turns on the hold switch 8 after starting document transmission but before there are no more transmitted documents, The transmitter 1 operates as shown in FIG.

That is, the transmitter 1 transmits the EOP signal after transmitting the image signal of the final page, and in response, the receiver 6 transmits the MC signal.
If the F signal is returned, the preamble signal is repeated and sent. In this case, the interval t from the start time of each preamble signal to the start time of the next preamble signal is determined not to exceed 6 seconds.

In FIG. 4, when we look at the execution route during the transmission of the preamble signal, we see that r 30 indicated by a
0 bps 7 lag? ” becomes “-Yes”, while [Frame Reception? In addition, since the interval t is set not to exceed 6 seconds, "T26 seconds over?" indicated by C always returns "No", and in the end, in this case, the results indicated by arrows Q1 and Q2 are returned. The loop will be executed.

Next, if we look at the execution route between the preamble signals that are repeatedly sent out, we find that ['5oo
bps flag? " becomes "NO", and since the interval t does not exceed 6 seconds in this case as well, "T26 seconds over?" always becomes "No". Therefore, in this case, the loops indicated by arrows Q3 and Q2 will be executed.

Therefore, while the transmitter 1 repeatedly sends out the preamble signal as described above, the loop indicated by the arrows Q%1 and Q2 and the loop indicated by the arrows Q3 and Q2 are repeatedly executed. Therefore, during that time, the receiver 1 does not disconnect the line, and the line 4 is put on hold.

Then, when the operator on the transmitting side adds a document to be transmitted to the transmitter 1, the transmitter 1 finishes transmitting only the preamble signal and shifts to message transmission again.

On the other hand, when the hold switch 3 is turned off, the transmitter 1 sends the first
Since the DCN signal is sent after the preamble signal as shown in the figure, the receiver 6 disconnects the line 4 using the line connection switching unit 6. In this case, as described above, according to the present invention, the execution route in FIG.
In a facsimile machine corresponding to T Recommendation Group 3, an excellent effect can be obtained in that the line can be held on the transmitting side even if there are no documents to be transmitted, when necessary.

[Brief explanation of the drawing]

FIG. 1 is a conventional signal system diagram of the phase 0 part of a Group 3 facsimile machine according to the 1ccITT recommendation. FIG. 2 is a block diagram of a facsimile system according to an embodiment of the present invention. FIG. The signal system diagram, FIG. 4, is a flowchart showing the operation on the receiving side in the embodiment. 1...Transmitter, 4...Line, 6...
···Receiving machine.

Claims (1)

[Claims] When there are no more originals to be transmitted, a control signal is sent to indicate this, and in response to the control signal, the receiver sends a control signal indicating that the message has been correctly received. In this case, the transmitter normally sends out a line disconnection command after a pre-angle signal shorter than a predetermined time width; If the receiver receives a preamble signal that is longer than the predetermined time width, and if the no-signal state continues for the predetermined time or more from the start of the preamble signal that was last received, and a receiver that is set to disconnect the line, and when the transmitter wants to hold the line even if there are no more documents to be sent, it indicates that the message sent from the receiver has been correctly received. Repeatedly transmitting a preamble signal to the transmitter in response to the control signal, such that an interval from the start point of each preamble signal to the start point of the next preamble signal does not exceed the predetermined time. A facsimile communication method for sending out.