JPS60111576A - Facsimile transmission system - Google Patents

Abstract

PURPOSE:To eliminate the idle time between a message signal and a digital signal and to shorten the transmission time by storing a digital discrimination signal from the receiving side, and when a mode is changed at the transmission time after the second page, by reading the stored signal and by deciding the mode. CONSTITUTION:A mesh control circuit 2 is connected with a telephone line 1, and an MODEM controller 4 and a serial data/parallel data converter 5 is connected with an MODEM 3 which is connected with the circuit 2. A CPU6 with a memory 7 is connected with the controller 4 and the converter 5, and a facsimile transmission system is constituted. When a mode is changed at the time of transmitting the original after the second page by this system, a digital discrimination signal DIS from the receiving side is stored in the memory 7. When a message confirmation signal MCF is received, the signal DIS is read, and a digital instruction signal is transmitted. Then, the idle time of the transmission time between the signal MCF and the DIS is eliminated, and the transmission time is shorten.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a facsimile transmission system, and more particularly to a facsimile transmission system with an improved transmission procedure when a mode change occurs.

[Prior art]

The conventional 03 facsimile transmission procedure followed Recommendation T30 "Procedures for Document Facsimile Transmission in General Telephone Switched Networks" in the CCITT Recommendations.

This T30 recommendation specifies the mode (line density in the sub-scanning direction, etc.) when transmitting the previous document and the mode when transmitting the next document when transmitting multiple documents without disconnecting the captured telephone line. If the mode is different, that is, in the case of a mode change, the sending side sends a ROM (message end) signal after sending the previous document, and then receives the DIS from the receiving side again.
(Digital identification) I was supposed to wait for a signal.

FIG. 1 shows the transmission procedure according to such a conventional method.

In other words, when a call is made from the transmitting side, the ringing tone is detected in the received signal, and then a CHD (called station identification) signal is transmitted.
The sending side receives this and presses the send button. Next, the receiving side transmits the DIS signal, which is saved on the transmitting side and determines the transmission mode, as well as the digital command signal D.
Purchase C8 and send it to the sender.

Then training, training check signal TCP
In response to this, the receiving side performs a modem 1/-2 checking and training Oi (in the case of C
An FR (ready for reception) signal is transmitted, and the transmitting side receives this and sends out a training signal.

Subsequently, the transmission of the image signal starts, the image signal is transmitted for a predetermined time, and then ends.

Subsequently, the procedure enclosed in a frame indicated by the reference numeral 1 is started.

After this, the procedure is started by detecting the next document and transmitting a ROM signal if there is a mode change.

The receiving side that detects this sends an MCF (message confirmation) signal and at the same time starts a 6 second timer.

Then, when the 6 seconds timeout occurs, only 1) I
Transmit S signal.

During this period of 6 seconds, neither the receiver nor the receiver transmits any signals.
The drawback was that there were gaps in the transmission procedure.

On the other hand, after receiving the DIS signal, the transmitting side determines the transmission mode, forms a DC8 signal, and sends it to the receiving side.

Subsequently, training and training check signals are transmitted, and the electronic transmission of the original in which the mode has been changed is started.

〔the purpose〕

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile transmission system that is configured to eliminate the blanks in the transmission procedure in the conventional system and shorten the transmission procedure.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figure 2 and the following diagrams explain one embodiment of the present invention.
A block diagram of the control circuit is shown in the figure.

That is, what is indicated by the reference numeral 1 in FIG. 2 is a telephone line, which is connected to the network control device 2. In FIG.

Reference numeral 3 indicates a modem, which is connected to a network control device 2, a modem control device 4, and a conversion device 5 for converting serial data into parallel data.

A CPU (Central Processing Unit) 6 controls the modem control device 4 and the conversion device 5, and transfers information to and from the memory 7.

Based on the circuit configuration as described above, control as shown in FIG. 3 is performed.

That is, when transmission is started, it is determined in step S1 whether or not the DIS signal has been received, and if it has been received, the DIS signal is stored in the memory on the transmitting side in step S2.
The signal is stored.

Subsequently, in step S3, a transmission mode is determined in accordance with the function of the receiver.

Then, in step S4, a DC8 signal is created, and in step S6, the DC8 signal is transmitted.
At step 7, training and a training check signal are transmitted, and the process proceeds to step 88.

In step S8, it is determined whether or not a CFR signal has been received. If the CFR signal has been received, the process proceeds to step S9, and if necessary, the process returns to step S6.

゛In step S9, a training signal and an image signal are transmitted, and in step 810, it is determined whether or not there is a next document. If there is, the process advances to step S11, and it is determined whether or not there is a mode change key, and the mode change is performed. If there is, a ROM signal is transmitted in step 812 and the process advances to step S13.

In step S13, it is determined whether or not the MCI" signal has been received, and if it has been received, the process advances to step S14,
Read the DIS signal from memory.

Then, in step 815, the transmission mode is determined by referring to the DIS signal, and in step 816, the DC8
A signal is created, a DC8 signal is transmitted in step 817, and the process returns to step S6.

In this way, the first DIS signal received on the sending side is saved in memory, and if there is a mode change when transmitting the second or later document, the first DIS signal received is read out from memory and its contents are The DC8 signal can be transmitted without receiving the DIS signal again, and the pre-message transmission procedure can be started.

Therefore, as in the past, after transmitting the MCF signal, the DIS
There is no gap in the transmission time of 6 seconds until the signal is sent, and the transmission time can be shortened.

Although FIG. 4 shows an explanatory diagram of the transmission procedure using the above-described method, the only change is that the DIS signal is stored in a part of the frame indicated by 2A and read out.
The other parts are exactly the same as those in FIG. 1, so the details will be omitted.

〔effect〕

As is clear from the above explanation, according to the present invention, the DIS signal from the receiving side is saved, and when there is a mode change during the second and subsequent transmissions, the saved DIS signal is saved.
Since a method is adopted in which the mode is determined by reading out the signal, there is no gap in the transmission time of 6 seconds between the MCF signal and the DIS signal as in the prior art, and the transmission time can be shortened.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the electric transmission procedure according to the conventional method, and Fig. 2 and the following are explanatory diagrams of an embodiment of the present invention.
FIG. 3 is a block diagram of the return circuit, FIG. 3 is a flowchart showing the control operation, and FIG. 4 is an explanatory diagram of the transmission procedure. 2...Network control circuit 3...Modem 6...CPU 7...Memory patent applicant Canon Corporation Figure 1 Figure 2 Figure 3 Figure 4 Factor

Claims (1)

[Claims] When transmitting data using a facsimile machine that can change the transmission mode using a data transmission procedure using a binary signal method, if the mode changes when transmitting the second and subsequent documents, the digital identification signal from the receiving side is saved. A facsimile transmission method characterized in that when a message confirmation signal is received, the stored digital identification signal is read out, and then a digital command signal is transmitted.