JPS5836068A - Code information transmission system by facsimile - Google Patents

Abstract

PURPOSE:To transmit code information together with an image signal by connecting a keyboard to the transmission side of facsimile equipment in group 3 standard (standardized by The International Telegraph and Telephone Consultative Committee) through an interface part and an error correction code adding means, and providing an error correction code decoding means on the reception side. CONSTITUTION:When character information is inputted on a keyboard 10, a check bit is added to the information bits by an error correction code adding means 8 through an interface part 9, and the information is stored in an RAM3 through a control part 6. To transmit the information together with original image data, a specific signal for showing the presence of code information is added behind the negative last one-line end signal of the original image data, and thus termination of the negative data is indicated, thereby transmitting the code information to be stored in the RAM3 next. On a reception side, when the specific signal is detected, an error if occurring is corrected and then code bits are inputted to and processed by an electronic computer 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a facsimile code information transmission system that is capable of transmitting code information along with image signals by adding simple means to G3 standard facsimile.

Recently, it has been expected that facsimile machines can be used not only for simple communication but also for information processing by connecting them to RTS machines. For this reason, there is a method in which a document from an optical character recognition device (hereinafter referred to as OCR) is sent by facsimile, read by OCR, converted into code information, and connected to a computer. However, the document for OCR has the disadvantage that the size and format of the document paper must be constant and that it is expensive.

The purpose of the present invention is to eliminate the above-mentioned drawbacks by adding an open hand to the G3 standard facsimile, and to provide 11% of the code information transmission system by facsimile, which is capable of transmitting code information along with image signals. It is in.

In order to achieve the above object, the present invention connects a keyboard to the sending side of a G3 standard facsimile through an interface section capable of reading code information and an error correcting code adding means. Return signal (RTC)
A signal with code information is inserted before or after the keyboard, and then a signal in which an error correction code is added to the code information of the keyboard and a code information end signal are transmitted, and the receiving side performs error correction code decoding processing means. This is a code information transmission method by facsimile, which is characterized in that the code information is received by correcting bit errors by identifying the code information by a signal containing the code information.

One practical example of the present invention will be explained below with reference to the figures. Figure 1 is a block diagram of an embodiment of the present invention in which an additional device is connected to a G3 standard facsimile, and Figure 2 is the information transmission format in the case of Figure 1. (4) indicates a case where only image information is transmitted, and 03) indicates a case where code information is also transmitted. Figure 3 shows the format of the code information (5) is the information pin) (B)
indicates the case where check bits for error correction code are added.

In the figure, 1 is a recording section, 2 is a data restoration section, 3 is a random access memory (hereinafter referred to as RAM'), 4 is a reading section, 5 is a data compression section, 6 is a control section, 7 is a modem, and 8 is an error) 9 is an interface unit, 10 is a keyboard, 11 is an error correction code post-processing unit, 12 is an electronic device, and 14 is image signal data.

15 is a line end number (hereinafter referred to as EOL), 16 is a specific code for 1 code information, Δ, and end, and 17 is code information.

18 is a control signal, 19 is a return signal to the control 11 signal (hereinafter referred to as RTC), 20 is an information bit, and 21 is a check bit. In a normal manuscript sent by facsimile, the last number of the page is only a white part and there is no dotted part.

Also, the facsimile resolution tl (1 scan!?l',
lpj ) is 1 familiar,! Ill number line, J-,
, 14i: A few white parts of the page material are different from the actual ones,
Even if a mixture of black and white appears corresponding to one square of running line density, it is not a particular problem as it is used as a facsimile receiver for six strokes. Therefore, the last few lines of Scheme 1 of the present invention are used to connect the code information to i) Riichi (9 machines, etc.).

To explain a normal G a jl L facsimile with reference to FIGS.
The data compression unit 5 encodes the data to 14, adds the rDOL 15 at the end of one line, and transmits 17 inches worth of data one after another, and EOI on the 41st page of the page.

Attach the RTC 19 having 6 pieces of 15, then send the control d1111i8 to form an image information transmission format 3-, and send it to the transmission path via the control unit 6 and modem 7.The receiving side processes the above image information. The data restoration unit 2 decodes the received data via the modem 17 and the control unit 6, identifies the end of one line and the end of a page, records it on recording paper in the 1i13 recording unit 1, and makes it the same as the transmitted original. This is commonly done. Even with this method, a less unnatural image can be restored in the case of Zanzo.

However, if even a single bit error occurs in the code information, the information becomes completely different in taste. Therefore, when transmitting code information, it is necessary to use a system that provides code redundancy and performs error correction or correction detection in the reception 6111. In the G3 standard facsimile, if there is a ring in the code information, the data cannot be retransmitted, so a Hamming code, BCIf code, or 1111 convolutional code is used as the error correction code. For example, when using a BCH code, if a code with 2-bit correction capability is used and Ml correction is performed on only 1 bit, it is always possible to detect the occurrence of an error, and countermeasures against burst errors can be taken. If we use a method such as isometrically converting to random errors using the interleaving method.

This is an example of a bit error rate p 6-I Q-4, which is bad for a transmission line, and as a BC'II code, eight sparing bits 21 are added to seven information bits 20 as shown in Figure 3. Assuming that a code with 2-bit correction ability is used, and the correction is 1 bit, the following equation will be obtained.Probability of no error (1-Pe) = 0.998501
``-(1) Probability of 1-bit error 15(1-Th)''P
e=ODO149790・” (2) Probability that there is a revised bit in the revised version 1-(1) 2-(2) Equation-101...
(3) If the code for one character is 8 bits, errors will not occur and errors can be detected, so it can be put to practical use by adding an error correction code and transmitting the code information. .

In addition, if you add character information corresponding to the code information to the facsimile image document and send it, the reception (1111)
If a prefecture is detected, the character information on the image document can be looked at and it can be re-entered into the computer 12 etc. 0 As shown in Figure 1, the keyboard 10. ! When character information to be sent is input by key operation, error correction code addition means 8 is sent via code information conversion interface section 9.
As shown in FIG. 3, a check bit 21 is added to the report bit 20 of the code information, which is controlled by the control II1 section 6 and stored in the RAM 3.

In this case, if necessary, use the keyboard 10 or the like to record the character information that you want to send to the image JIA draft that will be sent by facsimile. Next, ii (+Set the image original in the same way as normal facsimile operations and press the send button.Image Jg, page of the manuscript)
The process up to #Tawara-no-dokoro+1fj is the same as normal facsimile transmission processing. However, in this case, under the control of the control unit 6, as shown in FIG. RTCl that adds 16 and indicates the end of the page
9 (the specific signal 16 may be added next to RTCl, Q), and then sends the signal shown in FIG. 3 (n
) is transmitted, and then a code information end signal (for example, in the case of ) in FIG. 2 is sent by HA to RTCl 9, and then a control signal 18 is sent to the transmission line in the same manner as in facsimile.

On the receiving side, the process up to the end of the contest is the same as a normal facsimile, but the side-jumping section 6 detects the specific signal 16 with code information after the preamble of RTcl'l indicating the end of the page, and sends the code information 17. If there is an error, it is corrected by the error correction code decoding processing means 11, and inputted to the '+lC cotton machine 12, for example, as the original information bit 20 shown in FIG. Perform necessary processing. Error correction code decoding processing means 1
1, if there is an error that exceeds the erroneous pass light correcting ability, information that there is an error is sent to the labeling machine 12 and notified to the operator. In this case, the code information 17 is also sent to the data restoration section 2 recording section 1, so the last few lines of the received facsimile image should be white, but the mixed black and white side is included. However, this is not a problem as explained above.

The control section 6 detects the end of the code information 17 by the next code information end signal RTC19 after the code information 17, and performs the same control as in facsimile by the next control signal 18, and the operation ends. If the character information to be sent is recorded on the sending side, the operator can re-enter the necessary information into the computer 12 based on the information indicating that there was an error. Due to the above, G3
Code information can also be sent using standard facsimile, and communication can be done with computers, etc.

As explained in detail above, by adding a simple means to the factors of the G3 standard according to the present invention, it is possible to transmit code information together with the image data. ,' has the effect of being able to communicate with machines, etc.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention in which an additional device is connected to a 03 standard facsimile, and Fig. 2 shows the information transmission format in the case of Fig. 1. (B)
indicates the case where code information is also sent. The Kc3 diagram shows seven orders of code information. In the figure, 1 is a recording section, 2 is a data restoration section, and 3 is a RAM. 4 is a reading section, 5 is a data compression section, 6 is a control section, 7 is a modem, 8 is an error correction code adding means, 9 is an interface section, 10 is a keyboard, 11 is an error correction 8-code decoding processing means, l 2 iJ4! '／,!
: machine, 14C1ul+i image M scale data, 15 is EOL
, 111, specific number, 17 code information, 18, control ID, 19, RTC, 20, information bit, and 21, check bit.

Claims (1)

[Claims] A keyboard is connected to the sending side of a G3 standard facsimile via an interface section that can read code information and an error correction code adding means (, 7, return signal to control signal (
Insert a signal with code information before or after RTC),
Next, a signal in which an error correction code is added to the code information (from the keyboard) and a code information end code are transmitted, and the receiving side is equipped with error correction code decoding processing means, and the signal with the code information is transmitted. A method for transmitting code information by facsimile, characterized in that code information is received after identifying and correcting bit errors.