JPS62147859A - Facsimile text transmission system - Google Patents

Abstract

PURPOSE:To speed up a facsimile communication by sending an RTC representing the end of a page after a picture signal by one page is sent, sending an EOP after the transmission of all pages is finished to complete the communication. CONSTITUTION:When the reception side has the capability of continuous reception of pages and the sending side has the capability of continuous sending of pages, information representing the continuous page reception function is added in an NSF and the sending side adds information representing the transmission by the continuous page transmission system to an NSS while looking for the NSF. After the end of picture signals for the page 1, the picture signal for a page 2 is sent immediately. After the sending of the picture signal of the page 2 is finished similarly, pages 3, 4... are being sent. The RTC signal representing the end of the page is inserted at the end of the picture signal of each page and signals EOP, MCF, DCN are transmitted/received after the picture signal is sent in the normal operation and the line is disconnected.

Description

[Detailed Description of the Invention] (Table of Contents) Overview Industrial Field of Application Prior Art Problems to be Solved by the Invention Means for Solving the Problems Effects of the Invention (Summary) In carrying out facsimile communication, without sending and receiving notifications and corresponding acknowledgment signals each time one page is completed,
To realize high-speed facsimile communication by transmitting multiple pages at a time as if they were one page image signal.

[Industrial application field]

The present invention relates to a facsimile device, and more particularly to a facsimile electronic transmission system that can transmit documents at high speed.

[Conventional technology]

Conventionally, there has been a strong demand for faster speeds in facsimile communications, and various studies have been conducted. In the early days of facsimile communication, direct paper-to-paper communication was carried out, but this form of communication naturally had its limitations due to mechanical constraints when converting images on paper into electrical signals.

In order to eliminate this mechanical restriction, a memory element is provided, and the data on the document is first read, this is stored as an electrical signal in the memory element, and after the data is read, it is transmitted electronically all at once, and the receiving side also transmits the electrical signal. There is a form of memory-to-memory communication in which received data is stored in a -H memory element and the image is reproduced after the reception is completed.

FIG. 6 is a diagram illustrating the communication method at this time. As shown in the figure, in order to perform facsimile communication, the sender first issues a 16Hz ringing signal, and then
The receiving side sends a signal CHD indicating that it is connected. At the same time, a signal NSF indicating the capabilities of the receiving side (for example, modem speed, paper size, etc.) and a digital identification signal DIS are sent back. When the transmitting side receives these, the transmitting side determines the capabilities of the sending side that match the receiving side. It sends a signal NSS indicating (for example modem speed, paper size, etc.). After that, a training signal is sent from the transmitting side, and after receiving the signal CFR indicating that training is OK from the receiving side, the transmitting side sends the image signal of page l along with the training signal for adjusting the rise time. The end of the image signal for page 1 includes a signal RTC indicating the end of the page. After that, the sender sends an M that means "next page available".
A PS signal is sent and the receiving side sends a signal MC indicating "acceptance".
F is sent back. After transmitting and receiving these MPS and MCF, along with a training signal for adjusting the rise time,
The image signal for the next page 2 will be sent.

After all pages have been transmitted, a signal EOP is sent from the sending side, and in response to this, an MCF indicating "understanding" is sent, and the sending and receiving ends. Thereafter, a DCN is sent and the line is disconnected.

The data format of this conventional example is shown in FIG. 7, for example. In the figure, EOL is I! nd of Line, that is, the end of 1 line, and RTC is a signal that indicates the end of one page.

[Problem that the invention seeks to solve]

In the case of the above-mentioned conventional example, a memory is used for transmission and reception, and memory-to-memory communication is performed, and compared to direct paper-to-paper communication, a considerable speed increase is achieved. However, the image signal of each page and the RTC indicating the end of the page are 14400 to 2400 bp.
s high-speed signal, but the MPS, which is inserted between the image signals of each page to indicate the presence of the next page, and the MCF, which indicates a response (acknowledgement) to the MPS, are slow at 300 bps, which is quite slow for transmitting multiple pages. The problem is that it takes a lot of time.

[Means for solving problems]

In order to solve the above problems, in this invention, the first
As shown in the figure, after transmitting the image signal for one page,
The RTC indicating the end of the page is transmitted, and the next page is immediately transmitted without transmitting and receiving the signal MPS indicating that there is a next page and the MCF indicating understanding until the transmitted page ends, as in the conventional method. After completing the sending page, EOP is sent and communication is completed.

[Effect]

In this way, by omitting the slow transmission and reception of MPS and MCF for each page, high-speed facsimile communication is realized.

〔Example〕

Next, the present invention will be explained in detail using FIGS. 2 and 3. FIG. 2 shows a facsimile communication procedure according to the procedure of the present invention. First, the sending side sends a 16 llz calling signal, and upon receiving this, the receiving side sends a signal CED indicating that it is connected, and at the same time sends a signal NSF and NSF indicating the capabilities of the receiving side, such as the speed of the modem used, the paper size, etc. A digital identification signal DIS is sent back. Next, after receiving this information from the receiving side, the sending side
The information NSS indicating the ability to communicate is sent back. This allows transmission and reception to be performed using the common maximum capability of both the transmitting and receiving sides. After that, a training signal is sent from the transmitting side, and after receiving the signal CFR indicating that training is OK from the receiving side, the transmitting side sends the image signal of page l along with the training signal for adjusting the rise time.

In the present invention, when the receiving side has continuous page receiving capability and the transmitting side also has continuous page transmitting capability, information indicating the existence of the continuous page receiving function is added to the NSF, and based on this, the transmitting side also Add information to the effect that it will be transmitted using the continuous page transmission method in the NSS. Immediately after the image signal for page 1 ends, the image signal for page 2 is sent. Similarly, after transmitting the image signal of page 2, immediately after transmitting the image signal of page 2, pages 3, 4, etc. are transmitted. Note that, as in the conventional example, an RTC signal indicating the end of the page is inserted at the end of the image signal of each page.

In normal case, EOP, MCF, DCN after transmitting the image signal
will be sent and received, and the line will be disconnected. By the way, when the receiving side detects an error in the data from the transmitting side during this transmission, the receiving side will report this error as described later, so the transmitting side will have a function that allows it to resend the frame where the error occurred based on this error report. has. The data at this time is, for example, as shown in FIG. In addition, in the data part (E
(OL+data) Contains information on n lines. Furthermore, F
is a flag, A is an address, and C is a data portion for control, but since they are not particularly relevant to the present invention, detailed explanation will be omitted.

Next, the operation of the transmitter will be explained with reference to the transmitter block diagram shown in FIG. In the transmitter, first the reader lO
reads the image and creates an image signal. This is compressed by the compression section 12.
and store it in the sending memory (file memory). Note that the compression section adds an RTC indicating the end of the page to the image signal. Therefore, an RTC is added and stored in the memory every time a page ends, and is managed for each page. This reading is continued until there is no more original to be transmitted (the limit is until the transmission memory 17 is full). This data is transmitted to the transmission control section 14 and sent out via the modem 15 and line control section 16.

Note that the transmission control unit 14 has the following commands: v! There is a procedure signal generator that indicates that pages can be sent and received. The transmission control unit is equipped with two lines of memory (frame buffer), which stores the data currently being transmitted and the previously transmitted data. As will be described later, the receiving section detects errors in the transmitted data, and if there is an error, it notifies the transmitting section of the error using a tonal signal, for example, 330011z. Notification detection unit 19
Detect with. In response to this, the error control unit 18 requests the transmission control unit 14 to retransmit the previously sent frame data. The transmission control unit 14 stops the current frame and starts transmission again from the retransmission frame. Further, an RTC detection unit 20 is connected to the transmission side memory, and the transmission unit also monitors the RTC, and further counts the number of retransmissions, and when the number of retransmissions reaches, for example, 10, the RTC transmission unit 0 The communication ends when the number of retransmissions reaches a certain count. 0 The unsent pages that have not been sent are newly sent to the next page. Communicate as a retransmission procedure when communicating. These controls are carried out by the FAX control section 1.
This will be carried out under the supervision of 3.

The receiving section stores the received data in a receiving side memory (buffer memory) 29 via the line control section 22, modem 23, and transmission control section 24, as shown in FIG. The transmission control unit 24 includes a procedure signal generation unit that indicates that continuous page transmission and reception is possible, checks the protocol, and performs reception control to continuously receive data until an EOP is detected when there is a multi-page transmission indication in the NSS. , the receiving section is equipped with an error detection section 2B, and when an error is detected, the error notification section 27 and the line 11
Error notification is performed via the control unit 22 using a transmission-side general signal.

Error detection is performed by checking the CRC within the frame signal. If the CRC is in error, a retransmission request (tonal signal) is sent on the same line.

Data from the transmitting side continues to be stored in the receiving side memory 29 during communication. This is converted to the original data by the decompression unit 25.At this time, RTC is detected and recorded and output for each page.If the receiving unit does not detect RTC, an error occurs in the page being recorded. Record an error pattern indicating that a problem occurred and exit.

Needless to say, these controls are performed by the monitoring subordinate 1 of the FAX'lJm section 31.

[Effects of the Invention] As described above, in the present invention, by transmitting a plurality of pages of original documents together as one, the procedures between pages can be shortened and higher speeds can be realized. Also, since it has an error retransmission function, accurate communication is possible.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the principle of the present invention, FIG. 2 is a diagram showing the communication procedure of the present invention, FIG. 3 is a diagram showing the data format of the present invention, and FIGS. 4 and 5 are diagrams according to the present invention. FIG. 6 is a diagram showing a conventional communication procedure; FIG. 7 is a diagram showing a conventional data format. lO...-reading section 12...-data compression section 13--FAXIilI control section 14.24...
...Transmission control unit 15.23...Modem 16.
22 --- Line control unit 17 --- Transmitting side memory
18--Error control unit 19--Error notification detection unit 2o--RTC detection unit 21--Transmission page management unit 25-Song data expansion unit 26--Recording Section 27--Error notification section 28--Error detection section 29-- Receiving side memory section 30...
・-Error pattern generation section 31-FAX II control section

Claims (1)

[Scope of Claims] A transmitting unit that has a transmitting side memory that stores compressed image data for each page, a transmission control unit that has a memory that can retransmit frames in which an error has occurred, and a transmitting unit that receives the compressed data and A procedure signal indicating that continuous transmission and continuous reception of multiple pages is possible in a facsimile machine equipped with a reception side memory that stores the data, and a reception section that has an error detection section that detects errors in the data being transmitted. A facsimile transmission system characterized by being equipped with a sending section (14) and capable of continuously transmitting and receiving multiple pages of data.