KR100262544B1 - Method for transmission speed control in facsimile - Google Patents

Abstract

PURPOSE: A method for controlling the transmission speed of a facsimile is provided to prevent the loss of image data received by checking the residual of a memory of a receiving place, and by delaying the transmission speed of a transmitting place. CONSTITUTION: A telephone line is connected between a transmitting place and a receiving place(S1). After the transmitting and the receiving place mutually exchange a protocol regulated, the transmitting place transmits image data and the receiving place receives the data(S2). A CPU of the receiving place checks whether the volume of one page of the data is received(S3). The CPU checks the residual of a memory(S4) and the minimum scanning time each line(S5). In case that the residual of the memory is below 10%(S6), it is checked whether the minimum scanning time is set as 40ms(S7). The minimum scanning time is set as 40ms(S8). The CPU judges whether the residual of the memory is existed in the range of 10%¯30%(S9). It is checked whether the minimum scanning time is set as 20ms(S10). The minimum scanning time is set as 20ms(S11). A transmission/receipt work is completed(S12). In case that the work is completed, the telephone line is cut off(S13).

Description

How to control transmission speed of fax

The present invention relates to a method for controlling a transmission speed of a facsimile, and more particularly, in the process of transmitting / receiving image data between a facsimile of a destination having a memory reception function and a facsimile of a destination, an image at the destination according to the remaining memory amount of the destination. The present invention relates to a method for controlling a transmission rate of a facsimile in which a data transmission rate is changed and transmitted.

In recent years, as fax communication becomes general, much information is exchanged through facsimile. Especially for documents that need to be processed quickly, the exchange of information through facsimile is very effective, thereby greatly improving work efficiency.

As information exchange through facsimile is performed very frequently, memory is installed in the facsimile to improve the reception rate of the information or to receive a large amount of information. This enables memory transmission / reception of specific documents.

As mentioned above, information exchange through facsimile is roughly divided into a document transmission / reception method and a memory transmission / reception method. At this time, in order to adjust the scanning time of the image data, the coding and decoding time of the image data, the printing time of the image data, etc., between the destination and the fax of the destination, 'Will be set.

The minimum transmission time is a condition for adjusting the capability difference (scanning time, coding / decoding time, printing time, etc.) between the destination fax and the destination fax. At the destination, the original is scanned and sent to the destination, and the destination is sent from the destination. When printing an original immediately (when sending / receiving by original), this is the minimum time to match the processing speed of the destination and the processing speed of the destination.

Therefore, in the case of the conventional facsimile in which the original transmission / reception method is applied, even if the size of the image data is smaller than the minimum transmission time, additional image data (Dummy Image Data) is added to the actual image data so as to meet the minimum transmission time. Including sending and receiving work.

On the other hand, in the case of the conventional facsimile using the memory transmission / reception method, since scanning, coding / decoding, and printing are not performed in real time, the scanning time, coding / decoding time, printing time, etc. do not need to match. Nevertheless, when the size of the image data is small, it is designed to perform the transmission / reception operation by including additional image data in the actual image data, similarly to the transmission / reception method by the original.

In the case of a fax machine having a built-in memory, when a printer having a recording speed of 60 to 70 seconds is employed when printing on A4 standard recording paper, the amount of image data received becomes larger than the amount of image data to be printed. Is accumulated.

By the way, according to such a conventional facsimile, the following problem arises.

(1) Although the amount of received image data is larger than the amount of printed image data, communication is performed while maintaining the same line scanning time continuously even though image data accumulates in the memory. Full) 'and communication is blocked. Thus, image data not received yet is lost.

(2) In order to re-receive image data that has not been received, it is inconvenient because a retransmission task should be requested to the transmission destination.

Accordingly, an object of the present invention is to solve such problems, and an object of the present invention is to check the remaining memory of a destination and request that the transmission speed of the destination be delayed by a predetermined speed to prevent loss of received image data. The present invention provides a method for controlling a transmission rate of a facsimile.

1 is a schematic block diagram of a facsimile applied to the present invention;

2 is a diagram illustrating elements constituting a minimum transmission time based on Recommendation T.4 of the ITU-T;

3 shows the bit contents of a protocol for setting a minimum scanning time per line based on Recommendation T.30 of ITU-T;

4 is a flowchart illustrating an operation of a method for controlling a transmission speed of a fax according to the present invention.

<Description of the code | symbol about the principal part of drawing>

1: CPU 2: Memory

3: operation panel 4: scanner

5: Modem 6: Network Control Unit (NCU)

7: Printer 8: Sensor

A feature of the present invention for achieving the above object is a method for controlling a transmission speed of a fax for transmitting / receiving image data between a destination fax including a memory and a destination fax: a communication path between the destination and the destination is established. A transmission step of transmitting the image data with a minimum scanning time per preset initial line after exchanging protocols, if formed; A checking step of checking the remaining memory amount of the destination when a predetermined amount of image data is transmitted; A detection step of detecting a minimum scanning time per line which is preset according to the currently checked memory remaining amount; And a resetting step of changing and setting the current minimum scanning time per line according to the detected minimum scanning time per line. And a method of controlling a transmission speed of a facsimile which repeats the transmission step to the reset step until all of the image data is transmitted.

Preferably, the minimum scanning time per initial line comprises 5 milliseconds [ms].

Preferably, the predetermined amount includes one page amount.

Preferably, in the detecting step, the memory remaining amount of the destination is divided into a plurality of classes, and is detected by referring to a look-up table that sets a minimum scanning time per line corresponding to the divided plurality of classes.

Preferably, the minimum scanning time per line includes 40 [ms] and 20 [ms] and 10 [msec] and 5 [msec].

Optionally, in the detecting step, when the remaining memory amount is 10 [%] or less, the minimum scanning time per line is detected as 40 [ms], and when the remaining memory amount is 20 [%] or less, the minimum scanning time per line is obtained. 20 [ms] is detected. If the remaining memory amount is 30 [%] or less, the minimum scanning time per line is detected as 10 [ms]. If the remaining amount of memory exceeds 30 [%], the minimum scanning time per line is detected. This can be set to be detected by 5 [Hz].

Optionally, in the detecting step, if the remaining memory amount is 10 [%] or less, the minimum scanning time per line is detected as 40 [ms], and if the remaining memory amount is 30 [%] or less, the minimum scanning time per line is determined. 20 [ms] can be detected, and if the remaining memory exceeds 30 [%], the minimum scanning time per line can be set to 5 [ms].

Optionally, the minimum scanning time per line may be set and stored in the destination's facsimile. Preferably, the resetting step transmits information on the minimum scanning time per line detected by the destination to the transmission destination. Requesting to reset the current minimum scanning time per line to the detected minimum scanning time per line.

Optionally, the minimum scanning time per line may be set and stored in the facsimile of the transfer destination. Preferably, the resetting step may be performed by receiving the information on the remaining memory of the destination from the transfer destination and setting the preset line per line. After detecting the minimum scanning time, the current minimum scanning time per line is reset to the detected minimum scanning time per line.

Hereinafter, a preferred embodiment of a method for controlling a transmission speed of a fax according to the present invention will be described in detail with reference to the accompanying drawings.

1 shows a schematic block diagram of a facsimile applied to the present invention.

The facsimile as shown in FIG. 1 includes a central processing unit 1 which generally controls the facsimile according to a set program, program data, protocol data, text data, work contents related to transmission and reception, and the like. And a memory (2) for accessing or storing data under the control of the central processing unit (1), and a plurality of keys to generate the key data of the facsimile. (OPE) operation panel (OPE) including a display device so that the display data of the central processing unit 1 can be displayed, and the original data is scanned and converted into digital image data. After the control of the scanner 4 and the central processing unit 1 provided to the central processing unit 1, the output data of the central processing unit 1 is modulated and output in analog form, and Modem (5) for demodulating and outputting the input signal of the type, and is operated under the control of the central processing unit (1), the call loop of the Public Switching Telephone Network (PSTN) (consisting of Ring and Tip) A network control unit (NCU) 6 for interfacing signals between the modem 5 and the general telephone network, and a printer for printing fax data received by a control signal from the central processing unit 1 ( 7) and a sensor unit 8 which detects the remaining amount of recording paper or detects a document and provides it to the central processing unit 1.

Each of these components is the same as the configuration of a general facsimile, so a detailed description thereof will be omitted, and only essential components applied to the present invention will be described.

Referring to Figures 2 to 4 with respect to the operation of the present invention having such a configuration as follows.

First, FIG. 2 includes recommendations of the International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) (formerly, International Telegraph and Telephone Consultative Committee (CCITT)). Based on T.4, the elements constituting the minimum transmission time are shown.

As shown in FIG. 2, the minimum transmission time refers to a minimum time required for transmitting / receiving contents including end-of-line (EOL) to distinguish each line of image data and actual image data. That is, the transfer destination refers to the minimum time for scanning one line of the original, and the destination refers to the minimum time for printing one line of the image data.

In this case, when image data having a size smaller than the minimum transmission time (or minimum scanning time per line) is transmitted, additional image data is added to the actual image data in order to match the minimum transmission time.

In addition, FIG. 3 also includes recommendations of the International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) (formerly, International Telegraph and Telephone Consultative Committee (CCITT)). The bit contents of the protocol for setting the minimum scan line time per line based on T.30 are shown.

As shown in FIG. 3, the minimum scanning time per line is set to 20 [ms], 40 [ms], in accordance with the 21st, 22nd, and 23rd bits of data representing a digital identification signal (DIS) and a digital command signal (DCS). 10 [㎳], 5 [,], 0 [㎳] can be set.

On the other hand, Figure 4 is an operation flow diagram showing the process of performing the transmission rate control method of the fax according to the present invention.

When the call line is connected between the transmission destination and the destination (S1), the transmission destination and the destination exchange the specified protocol (T.30), then transmit image data at the transmission destination and receive it at the reception destination (S2). That is, the receiver transmits a Called Station Identification (CED) tone to the transmission destination in order to inform that the call path is connected in its fax. Thereafter, the receiver transmits a DIS (Digital Identification Signal) frame (DIS) frame to the transmission destination to inform the transmission destination of the reception capability of the destination fax, such as the transmission speed / compression method / resolution / minimum scanning time per line of the modem 5.

At the destination, check the contents of the DIS frame at the destination, compare the parameters set at the destination with the parameters of the destination, and send the transmission speed, compression method, resolution, minimum scanning time, etc. Set parameters to send to the destination through DCS (Digital Command Signal) frame.

Thereafter, the transmission destination transmits zero data (no data without any data) for a predetermined time (approximately 1.5 seconds) at a transmission speed of the modem 5 preset for line training. Is transmitted to the destination, and the destination sends a CFR (Confirmation To Receiver) frame, which is a response signal that the TCF data was successfully received at the transmission speed of the modem 5, to the transmission destination.

Receiving a CFR frame at the transmission destination indicates that normal fax communication operations can be performed, and thus transmits the image data to satisfy the minimum scanning time per line at the transmission speed of the preset modem 5.

Thereafter, the central processing unit 1 of the destination checks whether all the image data of one page has been received (S3). When all the image data of one page is received, the central processing unit 1 checks the remaining amount of the memory 2 and at the same time. (S4), the minimum scanning time per line is checked (S5).

At this time, assuming that the initial value of the minimum scanning time per line is set to 5 [m], if the remaining amount of the checked memory 2 is 10 [%] or less (S6), this means that the reception speed of the image data is the print speed. Since the memory 2 is almost 'full' because it is faster, it is checked whether the minimum scanning time per line is set to 40 [ms] (S7) and the minimum scanning time per line is set to 40 [ms]. (S8). Accordingly, the size of the additional image data additionally recorded in the actual image data is expanded, so that the reception speed at the destination is reduced. Therefore, since the reception speed of the image data is slower than the printing speed, the memory 2 'pool' is released after a predetermined time has elapsed.

On the other hand, if it is determined in the above step 6 (S6) that the remaining amount of the memory 2 is not 10 [%] or less, the central processing unit 1 of the destination receives the remaining amount of the memory 2 from 10 [%] to 30 [ %] Is judged whether it exists in the range (S9). If it is determined in this step 9 (S9) that the remaining amount of the memory 2 exists within the range of 10 [%] to 30 [%], it is checked whether the minimum scanning time per line is set to 20 [ms] (S10). The minimum scanning time per line is set to 20 [ms] (S11).

If it is determined in step 9 (S9) above that the remaining amount of memory 2 does not exist within the range of 10 [%] to 30 [%], this means that sufficient free space is secured in the memory 2. Therefore, the minimum scanning time per line is kept at an initial value (5 [ms]).

After that, it is checked whether the transmission / reception operation is completed for all image data (S12), and when the transmission / reception operation is completed, the communication line is blocked (S13), and all the processes are finished. If it is determined in step 12 (S12) that the transmission / reception operation is not completed for all the image data, the process returns to step 2 (S2) above and repeats all the processes after step 2 (S2).

Therefore, by delaying the transfer speed of the transfer destination according to the remaining amount of the memory 2 by a set time, it is possible to prevent the memory 2 'pool' from occurring and improve the reception success rate of the image data.

In the present invention, the remaining amount of the memory 2 will be described with the boundaries of 10 [%] and 30 [%], and the transfer speeds will be limited to 40 [k], 20 [k] and 5 [k]. However, this may be set by arbitrarily changing the value within the scope of the present invention.

For example, according to Recommendation T.30 of the ITU-T, the transmission speed is divided into 40 [㎳], 20 [㎳], 10 [㎳] and 5 [㎳], so that the remaining amount of the memory 2 is appropriately adapted. If the remaining amount of the memory 2 is 10 [%] or less, the transfer rate is set to 40 [ms]. If the remaining amount of the memory 2 is 20 [%] or less, the transfer rate is set to 20 [ms]. If the remaining amount of the memory 2 is 30 [%] or less, the transfer rate may be set to 10 [ms], and if the remaining amount of the memory 2 exceeds 30 [%], the transfer rate may be set to 5 [ms]. .

In addition, the above transmission rate value may be set and stored in the fax of the destination, and may request that the current transmission rate be reset to the detected transmission rate value by transmitting information about the transmission rate value detected by the destination to the transmission destination.

In addition, the transfer rate value is set and stored in the fax of the transfer destination, receives information on the remaining memory of the destination from the transfer destination, detects a preset transfer rate value, and then resets the current transfer rate to the detected transfer rate value. You may.

As a result, according to the method for controlling the transmission rate of the fax according to the present invention, there are advantages as follows.

In other words, in a facsimile of a receiving method using a memory, by checking the remaining amount of memory of a destination and requesting the transmission to be delayed by a predetermined speed, the reception of the image data is improved by preventing the memory pool from occurring.

Claims (9)

A method of controlling a transmission speed of a facsimile for transmitting / receiving image data between a destination facsimile including a memory and a destination facsimile: A transmission step of transmitting the image data at a predetermined minimum scanning time per initial line after exchanging protocols when a communication path is formed between the transmission destination and the destination; A step of checking the remaining amount of memory of the destination when one page amount of image data is transmitted, and determining a class corresponding to the current remaining amount of memory among a plurality of grades divided in advance corresponding to the total remaining amount of memory; A detection step of detecting a minimum scanning time per line from a look-up table stored in a fax of either the destination or the transmission destination corresponding to the class determined in the determination step; A resetting step of changing and setting a current minimum scanning time per line according to the detected minimum scanning time per line; And a facsimile transmission speed control method for repeating the transmission step from the transmission step until the image data is completely transmitted. The method of claim 1, wherein the minimum scanning time per initial line is A method of controlling a transmission rate of a fax including 5 milliseconds [ms]. The method of claim 1, wherein the minimum scanning time per line is: A method of controlling a transmission speed of a fax including 40 [㎳], 20 [㎳], 10 [㎳], and 5 [㎳]. The method according to claim 1 or 3, wherein in the detecting step, If the remaining memory amount is 10 [%] or less, the minimum scanning time per line is detected as 40 [ms], and if the remaining memory amount is 20 [%] or less, the minimum scanning time per line is detected as 20 [ms], If the remaining memory amount is 30 [%] or less, the minimum scanning time per line is detected as 10 [ms], and when the remaining memory amount is more than 30 [%], the minimum scanning time per line is detected as 5 [ms]. Facsimile transmission speed control method. The method according to claim 1 or 3, wherein in the detecting step, If the remaining memory amount is 10 [%] or less, the minimum scanning time per line is detected as 40 [ms], and if the remaining memory amount is 30 [%] or less, the minimum scanning time per line is detected as 20 [ms], And the minimum scanning time per line is detected as 5 [ms] when the remaining memory exceeds 30 [%]. The method of claim 1, wherein the minimum scanning time per line is: A facsimile transmission rate control method set and stored in a facsimile of the destination. The method of claim 6, wherein the resetting step, And transmitting the information about the minimum scanning time per line detected by the destination to the transmission destination so as to reset the current minimum scanning time per line to the detected minimum scanning time per line. The method of claim 1, wherein the minimum scanning time per line is: A method of controlling a transmission speed of a facsimile set and stored in a facsimile of the destination. The method of claim 8, wherein the resetting step, After receiving the information on the remaining memory of the destination from the transmission destination to detect the preset minimum scanning time per line, transmission of a fax to reset the current minimum scanning time per line to the detected minimum scanning time per line Speed control method.

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