JPH01128665A - Facsimile picture data transmission controlling system - Google Patents

Abstract

PURPOSE:To prevent a while line signal from being transmitted when data to be outputted from a center computer are delayed by causing the fill signal of a constant length to be the signal of all '0', whose length is a K-fold (K>=2) minimum transmitting time length of one line of a facsimile signal. CONSTITUTION:When the facsimile signal is formed and transmitted after encoding data are converted to picture data and accumulated to a data buffer and the data accumulated in the data buffer and to be transmitted are decreased less than constant quantity, fill(FILL) data to be dummy data are added to the picture data of respective lines by prescribed quantity (a prescribed time length) and one line is prolonged. In such a case, the fill bit of the prescribed length obtains a bit length to be continued for a K-fold (K>=2) minimum transmitting time(t), which is above mentioned, and a maximum time is suppressed within 5Sec by an international standard. Thus, when the data to be outputted from the center computer are converted to the picture data and transmitted through the data buffer and the data to be outputted from the center computer are delayed. the white line signal is not transmitted.

Description

[Detailed Description of the Invention] [Summary] A center-to-end type facsimile image converter that converts code data from a center computer into image data, transmits it to a terminal device, and records characters, etc. corresponding to the data on the terminal device. Regarding the data transfer control method, when the data output from the center computer is converted to image data and sent via the data buffer, a facsimile image control system that prevents the white line signal from being sent when the data output from the center computer is delayed. The purpose is to provide a data transfer control system, in which encoded data from a computer at the center is converted into both data by a conversion unit, and the data is supplied to the terminal control unit via a data buffer and transferred to the terminal device as a facsimile image signal. In a center-to-end facsimile image data transfer control system, the terminal control section includes a buffer storage amount detection section that detects the amount of data stored in the data buffer and generates an output when the amount of data is less than a predetermined amount. , a long fill insertion section that is driven by the output of the buffer storage amount detection section and inserts a fill signal of a fixed length between the image data and the line end signal, and the fill signal of the fixed length is inserted into one line of the facsimile signal. times the minimum transmission time length (
The signal is configured to be an all "0" signal with a length of K≧2).

[Field of Industrial Application] The present invention is a center-to-end type facsimile image processing system that converts code data from a central computer into image data, transmits it to a terminal device, and records characters, etc. corresponding to the data on the terminal device. Related to data transfer control method.

In recent years, facsimile terminals have become widespread, along with OAl machines, and because traditional telephone calls regarding transaction data lack reliability, banks, securities companies, and other service institutions are using facsimile machines installed at their branches or installed by customers. Recording techniques began to be used. In that case,
Data output from the center's large computer (code data)
, each character is converted into a pattern with several tens of vertical and horizontal focal points using means such as a pattern generator, which is then transmitted for each scanning line and recorded on paper in the facsimile machine of the terminal.

When transmitting the code data output from such a center computer to a terminal as facsimile image data, the code data from the computer is not necessarily output continuously, so some measures are taken when transmitting the facsimile image data to the terminal. However, it has been desired to realize a method that is not noticeable on the recording paper of the terminal device.

[Conventional technology] An explanatory diagram of a conventional example is shown in FIG.

FIG. 3A shows the configuration of a conventional example. In FIG. 3A, 30 is a center (host processing device), 31 is a conversion device, and 32 is a facsimile terminal device.

When performing center-to-end facsimile communication in the G3 procedure mode, when data accumulated in the host processing device of the center 30 is supplied to the conversion device 31, the conversion device 3
1, this data is converted into a dot pattern facsimile image signal format using a known technique such as a pattern generator, and is transmitted via the buffer 311 to the facsimile terminal device 32 in the G3 procedure mode, for example.

Figure 3 (B) shows the format of the facsimile image signal in the G3 procedure mode.
e) represents a division for each scanning line, and DATA is image information. In addition, EσL and E
A minimum value is defined for the data transmission time between OLs, and image information DA
If the data length of TA is less than this time, the fill (FILL) bit (""0"0") is set as shown in the figure.
bit).

FIG. 3(D) shows a control flow of transfer control in a control unit of a conventional conversion device.

In step 300 of this flow, it is determined whether the data buffer is free, and if it is not, the process moves to step 310, and the total length of the image data and 2OL is the minimum transmission time t (2 Qms according to the international standard CCITT). is the standard, and there are 4Qms, 1Qms, and 5ms as obscenes), the data from the buffer is sent to the terminal device, and when it is shorter than the minimum transmission time, the data is sent to the terminal device, and when it is shorter than the minimum transmission time, the data is sent to the terminal device with a fill length that satisfies the minimum transmission time ( Insert a signal (hereinafter simply referred to as fill).

Next, if it is determined in step 300 (D) that the data buffer is empty, a white line sending operation in step 320 is performed.

Such a situation in which the data buffer becomes empty occurs when data input from the host processing device of the center 30 to the conversion device 31 in FIG. 3(A) is delayed for some reason, and the data in the buffer 311 becomes empty. All of the image data is sent out, and there is no more image data to be sent from the conversion device 31 to the facsimile terminal device 32.

In such an underflow state, according to the prior art, a white line is sent out.

The transmission of this white line is shown in the example of the conventional white line signal shown in FIG. , when the data buffer becomes empty, "full white" image data + fixed length fill data is sent out as image data sandwiched between two EOLs, and a line (scanning vA ).

[Problems to be Solved by the Invention] As described above, according to the conventional technology, when data from the central computer is delayed, a white line signal is sent out, but depending on the degree of data disruption from the upper level, the signal may be The problem with the receiving facsimile terminal is that several lines of meaningless white straight lines are recorded on the recording paper in some cases, making it difficult to read images containing black before and after the paper, resulting in deterioration of image quality. was there.

The present invention provides facsimile image data transfer control that prevents the white line signal from being sent when the data output from the center computer is delayed when the data output from the center computer is converted into image data and sent via a data buffer. The purpose is to provide a method.

[Means for solving problems] The basic configuration of the present invention is shown in FIG.

In FIG. 1, 10 is a receiving unit that receives data (code) output from the center computer, 11 is a buffer that sequentially stores the data received by the receiving unit 10, and 12 is code data received from the buffer 11. 13 is a data buffer that stores each line data from the converter 12. 14 is a data buffer that stores line data from the data buffer 13. 142 is a long fill insertion unit; 143 is an EOL;
The insertion section 144 is a buffer storage amount detection section, and 15 is a main control section that controls the overall operation of each section of the reception section 10, conversion section 12, and terminal control section 14.

In the present invention, when forming and transmitting a facsimile signal after converting encoded data to image data and storing it in a data buffer, if the data to be transmitted accumulated in the data buffer decreases below a certain amount, each line A predetermined amount (predetermined time length) of fill data, which is dummy data, is added to the image data of , thereby making one line longer.

[Function] When the receiving unit 10 in FIG. 1 receives data output from the center computer, it sequentially accumulates it in the buffer 11, and the converting unit 12 is operated by the main control unit 15 to take out the data from the buffer 11 and convert it into a pattern. A generator (not shown) is used to convert the facsimile image data into line data based on bit information of 1' and 401.

The converted output is stored in the data buffer 13, and then the terminal control unit 1 operates under the control of the main control unit 15. This terminal control section takes out data from the data buffer 13, and sends the EOL code (0) to the line buffer section I41.
"There are 613 bits after 11 bits)" is E
The code is input from the OL code insertion unit 143 and added.

Also, as in the past, when the line data is shorter than the minimum transmission time according to international standards, the fill bit is naturally
It is added between the L codes (its configuration is not shown).

On the other hand, the buffer storage amount detection unit 144 monitors the amount of facsimile image data accumulated in the data buffer 13 and has not been transmitted, and when it detects that the detected amount is less than a predetermined amount, it generates an output. is supplied to the long fill insertion section 142. This drives the long fill insertion section 142 to generate and insert fill bits (all "0") of a predetermined length into the line buffer section 141.

In this case, a fill bit of a predetermined length has a bit length that lasts twice (K is an appropriate numerical value of 2 or more) the above-mentioned minimum transmission time t, and the maximum time is defined by the international standard (CCITT).
), but the fill bit has an appropriate length within that range.

The line data formed in the line buffer section 141 is transmitted from the transmitting section 145 to a facsimile terminal (not shown).
When the image data is sent to , the fill focus after the image data is not recorded at all, and the 1-line data signal simply becomes longer, which increases the transfer time and does not have any adverse effect on the recording. do not have.

[Embodiment] The configuration of an embodiment of the present invention is shown in FIG. 2 fat, and its operation flow is shown in FIG.

FIG. 2 fat includes the receiving section 10 and buffer 11 of FIG.
Although configurations corresponding to the above are omitted, these configurations are naturally included.

In FIG. 2 [al, 20 represents a conversion means, 21 represents a data buffer, 22 represents a terminal control unit, 23 represents a main control unit,
The main control section 23 controls the states of the reception section, conversion section, and terminal control section according to a predetermined sequence as in FIG. 1, and is a device including a microprocessor.

The converting means 20 converts the data input from the computer and stored in the buffer (see FIG. 1) into a dot pattern image signal and sends it to the bus 201 as line data.
The data are sequentially stored in the data buffer 21 under the control of control lines (including address lines).

As shown in the figure, the data buffer 21 is constituted by a memory having a storage capacity of N sides, and the line data stored therein is read by the reading circuit 221 of the terminal control unit 22 and subjected to data compression processing by the compression circuit 222. The data is then input to the data control circuit 225.

The data control circuit 225 adds an EOL to the data, and when the amount of data for one line after the pressure 41if is small, a fill bit is added so that the minimum transmission time is achieved as in the conventional case, and the data is supplied to the line register 226. 226
The bit data is transmitted from the communication control circuit 227 to a facsimile terminal (not shown).

On the other hand, the amount of data that has been accumulated in the data buffer 21 but has not been transmitted is detected by the buffer accumulation amount detection section 223. Although there are various methods for this detection, in this embodiment, each address for writing and reading is inputted from the control lines 202 and 229, and the difference between them is detected.

As a result of this detection, for example, the amount of remaining data (accumulated data to be sent) out of the storage capacity of N planes is n planes (0<n<N).
When it is determined that the amount of data will soon run out, it generates an output and generates FILL bits of length equal to the minimum transmission time x from the long fill generation circuit to control the data. Supplied to circuit 225. In response to this, the data control circuit 225 inserts the fill pin after the data in the line register.

As a result, the image data signal for one line becomes longer, and the interval between when data is extracted from the data buffer and sent becomes longer, so the time until the amount of data in the data buffer runs out can be extended, and during that time the center If data is input from the computer, line data of the original normal length will be transmitted.

The operation of the embodiment, including the above explanation of the operation, can be summarized as an operation flow as shown in FIG. 2(b).

f2 To explain this flow ρ, first data buffer 2
1 Check the remaining data buffer amount (Figure 2 (a)) (Figure 2 (bl 200)) If the number of memory planes is 0 or less, fill bits of the minimum transmission time xK are calculated for each line. If the remaining data buffer amount exceeds n, the process moves to step 210 similar to the conventional method, and if the line data is shorter than the minimum transmission time, the data control circuit selects fill bits that satisfy the minimum transmission time. 2
25, and if it is not short, send it as is.

After that, it is checked whether the amount of remaining data in the data buffer 21 is empty (step 220), and if it is determined that the data buffer 21 is empty (remaining data is zero), a white line is sent for the first time. (step 230), and when the data is accumulated in the data buffer, the process moves to step 200. When the main control unit 23 detects that no input from the center computer continues for a certain period of time,
The terminal control unit 22 is notified of the end of the data. As a result, the terminal control unit 22 ends the transmission operation after transmitting all the data in the data buffer 21.

[Effects of the Invention] According to the present invention, in a center-to-end type facsimile communication system, the white line sending state due to underflow of output image information can be extremely reduced compared to the conventional system, and the output of the facsimile terminal device can be It is possible to reduce quality deterioration to the screen.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle configuration of the present invention, Fig. 2 (a) is a diagram showing the configuration of an embodiment of the invention, Fig. 2 (bl is a diagram showing the operation flow of the embodiment, 1 is a diagram illustrating a conventional example. In FIG. 1, 10: receiving section 11: bath sofa 12: converting section 13: data buffer 14: terminal control section 142: long fill insertion section 144: vanofa storage amount detection section 15; Main control section

Claims (1)

[Claims] A unit (12) that converts encoded data from a computer at the center.
In a center-to-end type facsimile image data transfer control system in which the image data is converted into image data via a data buffer (13), the data is supplied to the terminal control unit (14), and the facsimile image data is transmitted to the terminal device as a facsimile image signal. The control section (14) includes a buffer accumulation amount detection section (144) that detects the amount of accumulated data in the data buffer (13) and generates an output when the amount of data is less than a predetermined amount; 144) and sends a fixed length film signal to the image data and line end signal (
and a long film insertion section (142) to be inserted during the EOL), and the fixed length film signal has a length K times (K≧2) the minimum transmission time length (t) of one line of the facsimile signal. A facsimile image data transfer control method characterized by an all-0 signal.