JPS63227176A - Facsimile communication method - Google Patents

Abstract

PURPOSE:To decrease the number of times of use of a time adjusting code, and to contrive to shorten a transmission time by providing a receiving buffer having a suitable capacity on a reception side, and executing a transmission without putting the time adjusting code until a prescribed state is obtained in a transmission side. CONSTITUTION:A reception side informs the receiving buffer capacity of its own machine and the minimum transmission time to a transmission side, and the transmission side stores them in a RAM 3. In the transmission side, picture information is send out successively to a line by a MODEM 5 and a network control circuit 4. Also, the number of transmission data D1 is counted, and also, the number of data D2 of one line is counted. Subsequently, when the picture information of one line is ended, the number D1 and the receiving buffer capacity D0 are compared. While the number D1 is below the capacity D0, the processing for adding a time adjusting code is not executed, and following the picture information, a line end code is transmitted. Also, after the number D1 has exceeded the capacity D0, the number D2 and the number of the minimum data are compared, and in case of D2-D0, the line end code is sent, following the picture information. In case of D2<D0, the time adjusting code is transmission, following the picture information.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a facsimile communication method in which reading, superstition, and receiving/recording of a document are performed almost simultaneously, and in particular, it relates to a facsimile communication method in which reading, superstition, and receiving/recording of a document are performed almost simultaneously. Regarding transmission technology.

As is well known in the art, in a typical facsimile, image information read by a scanner is encoded to compress redundancy, reduce the amount of data, and shorten transmission time. Transmission and recording of image information are performed line by line, and transmission and reception are synchronized in accordance with the recording speed.

In order to maintain synchronization between transmission and reception, a minimum transmission time is determined for transmission of one line of image information. Normally, the minimum transmission time for one line is determined by the recording speed of the receiving side. Before transmitting image information, the receiving side informs the sending side of the minimum transmission time, and the sending side adheres to the minimum transmission time and transmits the image information. Transmit.

FIG. 2 shows a format for transmitting image information according to the conventional method. In the figure, PIX is the encoded image information of 1 line, EOL is the line end code indicating the end of the line, and F
ILL is a time adjustment code added to match the minimum transmission time.

The length of one line of image information PIX is not constant depending on the condition of the document. If the transmission time of the image information PIX plus the line end code EOL exceeds the minimum transmission time, the time adjustment code FILL is not added and (PIX+EOL
) to send. This is the case on the X+3 line in the example of FIG.

If the image information PIX is short and the transmission time of (PIX + EOL) is less than the minimum transmission time, a time adjustment code FILL of an appropriate length is added, and the transmission time of (PIX + FILL + EOL) is
) is transmitted such that the transmission time is equal to the minimum transmission time.

The time adjustment code FILL is used for control purposes to maintain synchronization between transmission and reception, and is not essentially necessary for transmitting image information.

Problems to be Solved by the Invention The purpose of adding and transmitting the time adjustment code FILL, which is meaningless as information, is to lengthen the transmission time by that amount and synchronize with the receiving and recording operations.

Therefore, if synchronization can be maintained by other means, adding the time adjustment code can be omitted and the transmission time can be shortened by that amount.

The present invention was developed in view of these circumstances, and by adding a small hardware configuration, the number of times the time adjustment code FILL is used can be reduced, and the transmission time can be made shorter than before. The purpose of the present invention is to provide a facsimile communication method.

As a means to solve the problem, in the present invention, first, the receiver is provided with a reception buffer of an appropriate capacity, and the image information received through this reception buffer is sequentially recorded line by line. In addition, prior to transmitting image information, the minimum transmission time on the receiving side and the capacity of the above-mentioned receiving buffer are communicated to the transmitting side, and the transmitting side determines the amount of data to be transmitted when sequentially transmitting the encoded image information line by line. As long as the amount of data to be sent is less than the above-mentioned receive buffer capacity, the data for one line that is less than the above-mentioned minimum transmission time will be transmitted as is, and after the transmitted data exceeds the above-mentioned receive buffer capacity, A predetermined time adjustment code is added to one line of transmission data that is less than the above-mentioned minimum transmission time, and the data is transmitted in alignment with the above-mentioned minimum transmission time.

Effect: During a period when the time adjustment code is not used, data shorter than the minimum transmission time may be sent to the receiving side. However, since the recording process is performed via the reception buffer on the receiving side, a time adjustment effect can be obtained at this part, and the synchronized state of transmission and reception can be maintained.

Embodiment FIG. 3 shows an example of the configuration of a facsimile machine to which the present invention is applied. In the figure, 1 is a CPU (microprocessor) that controls the entire system, 2 is a CPU
ROM (read-only memory) that stores the program executed by I; RAM 3, which is used as a work area for the CPUI and a reception buffer, which is a feature of the present invention;
(random access memory), 4 is a network control circuit that controls the connection of the communication line, 5 is a modem that modulates the transmitted signal and demodulated the received signal, 6 is a scanner that reads the original,
7 is a plotter that records image signals on paper, 8 is a scanner 6
A codec encodes an image signal for transmission and decodes a received signal and supplies it to the plotter 7. Reference numeral 9 is a driver for a motor that conveys the original and recording paper. These configurations are basically the same as those of a general facsimile machine, but a feature of the present invention that differs from conventional facsimile machines is that a receiving buffer of a predetermined capacity is allocated to the RAM 3.

FIGS. 4 and 5 show the control procedure for the operation of the transmitting side and the receiving side according to the method of the present invention.

Further, FIG. 1 shows a transmission format of image information according to the method of the present invention. Hereinafter, one embodiment of the present invention will be described in detail with reference to these figures.

Once the transmission setup is established, the receiving side should notify the sending side of its own receive buffer capacity and minimum transmission time.The sending side receives the information and stores it in RAM3 (400L).
). In the following, the reception buffer capacity is set as Do, and the minimum number of data obtained by subtracting the number of EOL code data from the number of data corresponding to the minimum transmission time is set as C9. After this, the receiving side allows interrupts (501), and the transmitting side starts reading the original with the scanner 6 and encoding with the codec 8 (401).
01).

On the transmitting side, the encoded image information is sequentially transmitted to the next line by the modem 5 and the network control circuit 4 (402
). At the same time, the number D1 of transmitted data from the top of the page is counted (403), and the number D2 of data per line is counted (404). When one line of image information is finished, the number of transmitted data D1 and the receiving buffer capacity are calculated. (405→406).

The number of transmitted data is equal to the receive buffer capacity. , the process of adding the time adjustment code FILL is not performed and the image information PI
X followed by a line end code EOL (410
).

Also, after the number of transmitted data exceeds the reception buffer capacity Do, the number of data for one line D2 and the minimum number of data C6 are completely compared (407), and if D is larger than C6, the image information P
Transmit line end code EOL following IX (410
). ■If the number of line data D2 is smaller than the minimum number of data C6, the time adjustment code F is added following the image information PIX.
ILL is transmitted until the data number D2 of (PIX + FILL) exceeds the minimum data number C6 (407
→408→409), and then transmits a line end code EOL (410).

The above process is repeated sequentially until the end of one page.In Figure 1, from line (Y-7) to line (Y-1),
The number of transmitted data D1 is equal to the receiving buffer capacity. has not reached the time adjustment code FIL regardless of the length of the image information PIX.
No addition of L was performed. Therefore, the transmission time of one line may be less than the minimum transmission time. Then, at point A during transmission of the Y-th line, the number of transmission data D1 is equal to the reception buffer capacity. , and thereafter a time adjustment code FILL is added to the short image information PIX.

On the other hand, on the receiving side, when a unit amount of received data is collected in the modem 5, an interrupt is issued to the CPU 1, and the received data is written into the receiving buffer of the RAM 3 by interrupt processing (600). The CPUI also monitors whether there is unprocessed received data in the receive buffer (502).
If there is data, it is checked whether the codec 8 can process it (503), and if it can be processed, the data in the reception buffer is transferred to the codec 8 (504). The codec 8 decodes this data, and the plotter 7 records an image signal. This process is repeated until the end of one page.

In this way, the image signal is recorded through a reception buffer with an appropriate capacity, so as long as the reception buffer does not overflow, there is no problem even if one line of data is sent that is shorter than the minimum transmission time, and the transmission and reception can be completed without any problem. Synchronous relationships can be maintained. At the beginning of transmission, one line of data without the time adjustment code FILL that takes less than the minimum transmission time can be transmitted, so the transmission time is reduced by that much compared to the conventional method.

Effects of the Invention As explained in detail above, according to the facsimile communication method according to the present invention, a reception buffer of an appropriate capacity is provided, and a time adjustment code is attached until a certain state is reached. A reduction in transmission time can be easily achieved by software means that do not require the use of software.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of an example of a transmitted signal according to the method of the present invention;
The figure is a conceptual diagram of an example of a signal transmitted by a conventional method, Figure 3 is a schematic diagram of a facsimile machine to which the present invention is applied, and Figure 4 is a schematic diagram of a facsimile machine to which the present invention is applied.
5 and 5 are flowcharts showing control procedures for transmitting and receiving operations according to an embodiment of the present invention. PIX...picture information for one line, FILL...time adjustment code, EOL...line end code Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Diagram ←ゑ・１・４云子P→ Knee 7 Nico's]■KO Y-6 Old 7■KO Y-, 5 Logo Th mouth Y4 PIX EO
LY-, 3 Ro ■ Ko ■ Ko Y-Z 22 ■ Hundred = 22 T Roar 1 -Σ Ding = Goro No. 2 Figure ←E Koi Yunpo 1〒Mountain→X Shin Mouth [Wa=] Kokote= Construction area ro
Figure 5: Data link for D2/-1 line from the beginning of the merge

Claims (1)

[Claims] Prior to transmitting image information, the minimum transmission time on the receiving side and the capacity of the receiving buffer are communicated to the transmitting side, and the transmitting side automatically determines the amount of data to be transmitted when sequentially transmitting encoded image information line by line. As long as the amount of data to be sent is less than the receive buffer capacity, the data for one line that does not meet the minimum transmission time will be transmitted as is, and once the amount of data to be sent exceeds the receive buffer capacity, the minimum transmission time will be A predetermined time adjustment code is added to one line of transmission data that is less than 1 line, and the data is transmitted aligned with the minimum transmission time, and the receiving side sequentially records the image information line by line via the reception buffer. facsimile communication method.