JPS61255158A - Facsimile transmission system - Google Patents

Abstract

PURPOSE:To cope with a reception error in memory reception by replying a reception error to a transmitter and deleting a picture from a picture memory when the retransmission of the said picture is notified from the transmitter. CONSTITUTION:When picture information PIX is received by a receiver RX and it is discriminated that many errors take place in the receiver RX, a procedure end signal EOP is sent from the transmitter TX to the receiver RX and the receiver RX sends a retrain NOT signal RTN as a reply. In receiving the signal RTN from the receiver RX, the transmitter TX outputs a non-standard equipment setting signal NSS2 to inform the retransmission of the picture information to the receiver RX. Thus, receiver RX deletes the picture signal received just before the storage in the picture memory from the picture memory so as to ensure the storage area usable for the picture memory.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a facsimile transmission system using a facsimile device that temporarily stores received image information in an image memory.

[Prior Art] In recent years, facsimile machines have been put into practical use that are equipped with a large-capacity double-image memory, store received images in the image memory, and have various effective functions. Such Fakunmili equipment,
In this case, so-called confidential transmission is possible because image information can be received in a confidential state.

Furthermore, it becomes possible to perform so-called relay broadcast transmission in which the received information is sequentially transmitted to a plurality of other facsimile machines.

Furthermore, during confidential transmission, the recipient is notified of the confidential reception, and the received image is recorded and output only when the recipient performs a predetermined operation (for example, inputting a password).

However, in such conventional devices, if an error occurs in one-stroke information, reception is interrupted in that state, so during confidential transmission, when the recipient outputs the received image, and during relay broadcast transmission, the final When a receiving station outputs a received image, there is a problem in that the received image with the reception error is output without being properly configured.

In addition, even if the destination person discovers the received image with an error and requests the transmitting station to transmit the image again, the received image with the error cannot be deleted from the image memory. Another problem has arisen in that the image memory at the relay broadcasting station is inefficiently used.

[Objective] The present invention has been made to solve the above-mentioned disadvantages of the prior art, and it is an object of the present invention to provide a facsimile transmission system that can cope with reception errors during memory reception.

[Configuration] In order to achieve this object, the present invention not only responds to the transmitting device when a reception error occurs, but also deletes the image from the image memory when the transmitting device notifies the retransmission of the image. ing.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a facsimile device according to an embodiment of the present invention, and this facsimile device is used as a transmitting device and a receiving device. In addition.

In the following description, for the sake of simplicity, an example in which confidential transmission is performed will be described.

In the figure, a system control section 1 manages and controls the operation of the entire facsimile machine.

It is composed of a microcomputer system and is equipped with a large-capacity image memory 2. The operation display section 3 is provided with various operation keys for the operator to arbitrarily operate the facsimile machine and various displays for displaying messages etc. from the facsimile machine to the operator.

The scanner 4 scans the original to be sent at a predetermined resolution (for example, 8 dots in the main scanning direction and 7.7 lines/m in the sub-scanning direction).
(2) The image is divided into pixels and each pixel is converted into a black and white image signal, and the output is temporarily stored in the image memory 2. Further, the plotter 5 records an image on recording paper at the same resolution as the scanner 4 and outputs it.

The communication control section 6 executes facsimile transmission according to a predetermined transmission control procedure, and includes a modem 7 and a network control device 8 that modulate the transmitted signal and demodulate the received signal.
It is connected to a transmission line network (for example, a public telephone line network) via. The encoding/decoding unit 9 encodes the image information to be transmitted using a predetermined method, compresses the amount of information, and restores the encoded received image information to the original image information. The image information restored by the encoding/decoding section 9 is stored in the image memory 2.

With the above configuration, when this facsimile device serves as a transmitting device, the operator places the original to be sent on the scanner 4 and inputs the destination information (for example, the destination's telephone number or destination code such as an abbreviated number) from the operation display section 3. , When the transmission start command is then input, the system control unit 1 transfers the destination information input from the operation display unit 3 to the communication control unit 6 to set the destination, and also operates the scanner 4 to set the destination. The image of the transmission document is read and the obtained image signal is stored in the image memory 2.

Then, when you finish reading the image of this sent document,
The system control section 1 outputs a command to the communication control section 6 to start the transmission operation.

As a result, the communication control section 6 outputs the set destination information to the network control device 8, calls the destination station, executes a predetermined transmission control procedure, and transmits the information stored in the image memory 2. image information to the destination station.

Furthermore, when transmitting this transmission image information, the system control section 1 reads out the transmission image information from the image memory 2, sequentially transfers it to the encoding/decoding section 9, and encodes it. Then, the encoded image information is sequentially transferred to the communication control unit 6,
Transmit to destination station.

On the other hand, when this facsimile device operates as a receiving device, when a call is made from the transmitting device, the communication control section 6 is notified that the call has been made from the network control device 8, and the communication control section 6 also receives a call from the system control section. 1 and receives image information transmitted according to a predetermined facsimile transmission control procedure.

This received image information is transferred to the encoding/decoding section 9 and restored to a forward-dimensional image signal, and this image signal is stored in the image memory 2. Note that the transfer of image information to the encoding/decoding section 9 and the transfer of image signals from the encoding/decoding section 9 to the image memory 2 are controlled and executed by the system control section 1.

When such a reception operation is completed and all the received image signals are stored in the image memory 2, the system control section 1 displays on the operation display section 3 that there has been an incoming call and the addressee. In response to this, when the operator inputs an appropriate password, the system control section 1 reads the received image signal stored in the one-image memory 2.

The received images are sequentially output to the plotter 5, and the received images are recorded and output.

In this way, facsimile transmission is performed by the facsimile device described above. Further, detailed control such as the state of data exchange between each element in this facsimile device is the same as in the conventional device, so a description thereof will be omitted.

Next, an example of a facsimile transmission control procedure according to the present invention will be explained. This facsimile transmission control procedure basically complies with Recommendation T, 30 of the CC Engineering TT (International Telegraph and Telephone Consultative Committee), and is realized as one of its extended functions. .

That is, first, when the transmitting device Tx calls the receiving device RX (signal CLG), the receiving device RX responds with a called station identification signal CHD indicating that it is a non-voice terminal, and then calls the receiving device RX. It outputs a non-standard equipment signal NSF to notify the station of its optional features and a digital identification signal DIS to indicate that it has the standard features.

The transmitting device TX determines an optional function that can be used based on the non-standard device signal NSF, includes the optional function in the non-standard device setting signal NSS, and sets the function to be used in the communication in the receiving device RX.

When this function setting is completed, the training check signal TCP is outputted at the set modem speed, and the automatic equalizer of the modem 7 of the receiving device RX is trained.

The receiving device RX receives this training check signal τCF
If the reception result is good, the reception preparation confirmation signal CFR is sent.
As a result, the image information PIX is sent from the transmitting device TI.
is transmitted to the receiving device RX. In this case, for the sake of simplicity, we will consider a case where the image information PIX is one page.

In 22, consider a case where, when this image information PIX is received by the receiving device RX, it is determined that errors occur frequently in the receiving device RX.

In this case, when the procedure end signal EOP is transmitted from the transmitting device TX to the receiving device RX after the transmission of the two-way information PIX is completed, the receiving device RX responds with a retrain denial signal RTN. Then, to repeat the procedure from phase B, the non-standard equipment signal NSF and the digital identification signal DI
S is output to the transmitting device TX again.

When the transmitting device TX receives a retrain denial signal RTN from the receiving device RX, it determines that it is necessary to retransmit the same image information, and in this case, the image information to be transmitted next is the same as the previous image information. The receiving device R outputs a non-standard device setting signal N5S2 including data indicating that
Notify X that the image information will be resent.

Thereby, in the receiving device RX, the image signal received immediately before being stored in the image memory 2 is deleted from the image memory 2, and a usable recording area of one image memory 2 is secured.

After this, in the same manner as described above, the training check signal TCP is output from the transmitting device TX, and the training check signal TCP is output from the receiving device RX.
After a reception preparation confirmation signal CFR is responded from and the same image information PIX as the image information transmitted immediately before is transmitted from the transmitting device TX to the receiving device RX, a procedure end signal EOP is output from the transmitting device TX to the receiving device RX. be done.

At this time, if the receiving device RX receives the image information PIX with few errors, the receiving device RX responds with a retrain affirmation signal RTP to the transmitting device TX.

When this retraining signal RTP is responded.

The transmitting device TI determines that the receiving device RX has received proper image information, and in this case, since there is no subsequent image information, the transmitting device TI transmits a line disconnection command signal DCN and disconnects the network control device without waiting for a response. 8 puts the line on-hook and disconnects it.

Further, upon receiving the line disconnection command signal DCN, the receiving device RX causes the network control device 8 to put the line on-hook and disconnect it.

In this way, if the receiving device RX determines that the received image information is in error, the same image information is retransmitted from the transmitting device TX, so that image information without errors can be received. Furthermore, prior to retransmission, the transmitting device TX notifies that the image information to be transmitted first is the same as that transmitted immediately before, so the receiving device RX receives an error image that has been stored in the image memory 2. It is possible to reliably judge whether or not information can be deleted. In this way, when one image information is retransmitted, it is stored in both image memories 2. Since the error image information can be deleted, the usage efficiency of the image memory 2 is greatly improved.

In the above description, the case where there is only one original to be transmitted has been described, but the same transmission control procedure can be executed when there are a plurality of originals to be transmitted.

In that case, when switching pages, the transmitting device τX transmits the message end signal ROM and transmitting the subsequent image information with a phase B, giving the transmitting device TX an opportunity to output the non-standard device setting signal N5S2. It is necessary to set it up.

Further, in the above explanation, the case where confidential transmission is carried out has been described, but even when carrying out relay broadcasting, the transmission control procedure between the transmitting station and the relay broadcasting station is the same as described above.

Note that the purpose of providing the image memory in the transmitting device is to store retransmitted images; if images can be retransmitted by other means, the transmitting device does not necessarily require an image memory.

[Effects] As described above, according to the present invention, when a reception error occurs, this is responded to the transmitting device, and when the transmitting device notifies the retransmission of the image.

Since the image is deleted from the image memory, there is an advantage that reception errors during memory reception can be dealt with.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a facsimile apparatus according to an embodiment of the present invention, and FIG. 2 is a time chart showing a facsimile transmission control procedure according to an embodiment of the present invention. 1... System control unit, 2... Image memory, 3...
・Operation display section, 4...Scanner, 5...Plotter,
6... Communication control unit, frame... modem, network control device, 9... encoding/decoding unit. Figure 1

Claims (1)

[Claims] In a facsimile transmission method using a facsimile device that temporarily stores received image information in the image memory, if the receiving device determines that the received image information is an error, it notifies the transmitting device of the reception error in the post-message procedure and responds accordingly. 1. A facsimile transmission system, wherein when a transmitter notifies that the image information will be retransmitted in a pre-message procedure, the received image information stored in the image memory is deleted.