KR20000009857A - Method of reducing the transmitting time of the facsimile - Google Patents

Abstract

PURPOSE: A method of reducing the transmitting time of the facsimile is provided to reducing the size of the sending and receiving data by using the minimum substantial image data and therefore the transmitting time is reduced. CONSTITUTION: The method comprises steps of transmitting the image data and setting up the minimum transmitting time after the exchanging the protocol when the connection line between the sender and the receiver is formed(S104); detecting the last line of the image data(S105); checking the amount of the image data remaining at the sending side if the last line of the image data is detected; comparing the checked image data which is remaining and the standard amount corresponding to the minimum set up time and adding the dummy data so that the remaining amount of the image data and the amount of the data of the dummy data become more than the standard amount which corresponds to the minimum transmitting time.

Description

How to shorten fax transmission time

The present invention relates to a method of shortening the transmission time of a facsimile. More particularly, the present invention relates to a process of transmitting / receiving image data between a facsimile of a receiving side having a memory receiving function and a facsimile of a transmitting side. The present invention relates to a method for shortening the transmission time of a facsimile, which sets a minimum transmission time and variably adds dummy data according to the remaining amount of transmission data.

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, the scanning time of the image data, the coding and decoding time of the image data, the printing time of the image data, etc. are adjusted between the sending and receiving facsimile. 'Transmission time' is set.

The minimum transmission time is a condition for adjusting the capability difference (scanning time, coding / decoding time, printing time, etc.) between the sending side fax and the receiving side fax. The sending side scans the original and sends it to the receiving side. This is the minimum time for matching the processing speed of the sending side with the processing speed of the receiving side when the originals sent from the document are printed immediately (when sending / receiving by the originals).

Therefore, in the case of the conventional facsimile to which the original transmission / reception method is applied, when the size of the image data is smaller than the minimum transmission time, dummy data is further included in the actual image data to suit the minimum transmission time. Send / receive work should be done.

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 carry out the transmission / reception operation by including dummy data in the actual image data, similarly to the transmission / reception method by the original.

For example, if the minimum transmission time is 5 [ms] and the modem transmission speed is 14400 bits per second (bps), the transmitter should transmit at least 9 bytes of data even if the size of the 1-dot image data is small. (14400bps * (5ms / 1000ms) = 72bit = 9byte).

In other words, if the size of the actual image data does not exceed 9 bytes, the dummy data is further included and transmitted so that the size is 9 bytes or more.

However, according to such a conventional facsimile, even if the receiving side has a fast processing speed and has a memory, and there is no need to include dummy data because the total amount of data to be transmitted is large, the transmitting side is required for every line to fit the minimum transfer time. By including the dummy data, there is a problem in that the total amount of transmission data increases, thereby increasing communication time.

Accordingly, an object of the present invention is to solve such problems, and an object of the present invention is to set the minimum transmission time according to the capability of the receiving side, and then add only dummy data necessary when the remaining amount of transmission data on the transmitting side is less than the preset value. The present invention provides a method of shortening the transmission time of a fax which reduces the transmission time by reducing the total transmission data.

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 is a flowchart illustrating an operation of the method for shortening the transmission time 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: NCU

7: printer 8: sensor

A feature of the present invention for achieving the above object is a method for shortening the transmission time of a facsimile for transmitting / receiving image data between a receiving side facsimile including a memory and a transmitting side facsimile, the call between the transmitting side and the receiving side. When the furnace is formed, after exchanging protocols, a transfer step of setting a minimum transfer time, transmitting image data, a detecting step of detecting the last line of image data, and a detection side when the last line of image data is detected, A checking step of checking the remaining amount of the image data remaining in the step, a comparing step of comparing the remaining amount of the checked image data with a reference amount corresponding to the preset minimum transmission time, and if the remaining amount of the comparison result image data is less than the preset reference amount The dummy data is added to the last line of the image data, but the remaining amount of the image data and the dummy data It lies in comprising the additional step of adding dummy data so that they are at reference amount corresponding to the minimum transmission time, a predetermined amount of data.

The reference amount is preferably a value obtained by multiplying the transmission speed of the image data by the minimum transmission time.

Hereinafter, a preferred embodiment of the method for shortening the transmission time 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.

The operation of the present invention having such a configuration will be described with reference to FIGS. 2 and 3 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 transmitting side refers to the minimum time for scanning one line of the original, and the receiving side refers to the minimum time for printing one line of the image data.

Here, when the remaining amount of image data on the transmission side is less than the preset value, dummy data is added to the remaining actual image data to be transmitted in order to match the minimum transmission time.

Meanwhile, FIG. 3 is a flowchart illustrating an operation of the method for shortening the transmission time of the fax according to the present invention.

When the call line is connected between the transmitting side and the receiving side (S100), the transmitting side and the receiving side exchange the specified protocols (S101), where the receiving side transmits the transmission speed / compression method / resolution / per line of the modem 5 A modem for notifying the receiving side of the receiving side facsimile, such as the minimum scanning time, to the transmitting side, checking the contents of the receiving side, comparing the parameters set at the transmitting side with the parameters of the receiving side, Set parameters such as baud rate / compression method / resolution / minimum scanning time per line and send them to the receiving side.

Thereafter, the transmitting side transmits zero data (no data without any data) to the receiving side for a predetermined time (approximately 1.5 seconds) at the transmission rate of the modem 5 preset for line training. A response signal indicating that data has been successfully received at the transmission speed of the modem 5 is transmitted to the transmission side. When the transmitting side receives the response signal, this indicates that normal fax communication operation can be performed, and thus transmits image data so as to satisfy the minimum scanning time per line at the transmission speed of the preset modem 5.

The central processing unit 1 scans the transmission document at the minimum scanning time per line determined in this process (S102), and stores the scanned image data in the modem_buffer (S103).

The image data stored in the modem_buffer is transmitted to the receiving unit in line units (S104). Here, if the minimum transmission time is 5 [ms] and the modem transmission speed is 14400bps (bit per second), one line of images suitable for the minimum transmission time is provided. The size of the data is 9 bytes, so at least 9 bytes of data should be transmitted. However, if the receiving side has fast processing speed and has a memory, and there is a large amount of remaining image data on the sending side, it is not necessary to add dummy data to match the printing speed of the receiving side. Even if the bytes are not exceeded, only EOL (End Of Line) is added and transmitted to the receiver.

When the image data scanned in line units is transmitted to the receiver as described above, it is checked whether the scanned image data in line units is the last line (S105).

As a result of the check, if the scanned image data in the line unit is the last line, it is compared whether the size (remaining amount) of the image data stored in the modem buffer is less than the preset value (S106).

That is, the size of the remaining image data is compared with 9 bytes, which is the minimum size of data suitable for the minimum transmission time.

As a result of the comparison, if the size of the image data stored in the modem buffer is less than the preset value, a predetermined amount of dummy data is additionally stored (S107).

That is, if the size of the actual image data remaining on the transmitting side stored in the modem_buffer is less than the preset value which is the minimum size that the receiving side can process, the receiving side can process the received image data at the minimum transmission time. By adding dummy data to exceed the appropriate 9 bytes, the image data for transmission is prevented from running out.

After the additional image data is additionally stored in the modem buffer, the EOL indicating the end of the line is stored in the modem buffer (S108), and the image data stored in the modem buffer is transmitted to the receiver (S109).

Therefore, the transmission time can be shortened by adding dummy data according to the remaining amount of image data to be transmitted.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

As described above, according to the method for shortening the transmission time of the fax according to the present invention, the minimum transmission time is set according to the processing speed of the receiving side, and the additional image data is added when the remaining amount of the image data of the transmitting side is less than the preset value. Therefore, the size of the transmission data can be reduced by using only the minimum additional image data, and thus the transmission time can be shortened.

Claims (2)

In a method of shortening the transmission time of a facsimile transmitting / receiving image data between a receiving facsimile including a memory and a sending facsimile: If a communication path is formed between the transmitting side and the receiving side, transferring a protocol, setting a minimum transmission time, and transmitting the image data; A detection step of detecting a last line of the image data; A checking step of checking the remaining amount of the image data remaining on the transmission side when the last line of the image data is detected; A comparison step of comparing the remaining amount of the checked image data with a reference amount corresponding to the preset minimum transmission time; And If the remaining amount of the image data is less than the preset reference amount, the comparison result adds dummy data to the last line of the image data, wherein the remaining amount of the image data and the data amount of the dummy data correspond to the preset minimum transmission time. And an additional step of adding the dummy data to be equal to or more than a reference amount. The method according to claim 1, wherein the reference amount is The facsimile transmission method of claim 1, wherein the minimum transmission time is a value multiplied by the transmission speed of the image data.