KR100325817B1 - Method of converting resolution by remained memory size - Google Patents

Abstract

The present invention relates to a resolution conversion method according to the remaining memory in the facsimile.

An object of the present invention is to adjust the resolution of the fax data received from the sender when the memory of the receiving fax is less than the preset value in order to prevent the memory of the receiving fax becomes full during the transmission of the fax data. The present invention provides a method of converting a resolution according to the remaining memory.

To this end, the present invention forms a call path when a ring signal is input from the sending side fax, stores the fax data received from the sending side facsimile in the memory, and when the fax data of one page is received from the sending side facsimile, the remaining amount of the memory. If the remaining memory is less than or equal to the preset value, the resolution of the fax data that can be received by the receiving side fax is converted, the resolution of the converted receiving side fax is transmitted to the sending side, and the fax data is converted from the sending side fax. According to the receiver.

According to the present invention, since the resolution of the fax data received from the sending side facsimile is converted and stored according to the remaining memory of the receiving side facsimile, it is possible to maximize the memory utilization of the facsimile to receive more fax data.

Description

Method of converting resolution by remaining memory size}

The present invention relates to a method for converting a resolution according to the remaining amount of memory in a facsimile, and more particularly, to a method for converting the resolution of data according to the remaining amount of memory of a receiving side facsimile when receiving data from a sending side facsimile.

In general, a facsimile has a communication means such as a scanner capable of reading a document therein, a printer capable of outputting data in character form, and a telephone line for transmitting and receiving data with a remote party. Refers to an integrated device for interchangeable documents.

In order to transmit / receive fax data using such a facsimile, protocol exchange is performed between a transmitter and a receiver as shown in FIG. 1.

1 is a conceptual diagram illustrating a protocol for transmitting / receiving fax data.

Referring to FIG. 1, phase A is a call setup step, in which a sender dials to a receiver in a hook off state and sends a CNG (calling tone) signal until the receiver responds. When the CNG signal is received at the transmitter, the receiver transmits a CED (called station identification) signal, which is a response signal, to the transmitter.

Phase B is a step of checking the status of the terminal, the transmission path and the like and controlling the terminal. The terminal B performs transmission / reception preparation status, synchronization status confirmation, and prepares for transmission of the fax data.

That is, the receiver sends a CED signal to the sender, and then uses the non-standardfacilities (NSF) used to identify a special user's request that cannot be covered by the T recommendation, and the receiver's special identifier according to the international telephone number. It emits a digital identification signal (DIS) that specifies the called subscriber identification (CSI) and the standard CCITT capability of the receiving device, which is used to provide.

The sender receives the signal transmitted from the receiver, grasps the status of the receiver, and transmits it by using a non-standard facilities set-up (NSS), a digital command that responds to information contained in the NSF signal, and an international telephone number. It transmits a digital command signal (DCS) which is a digital setup command responsive to a standard capacity identified by a transmitting subscriber identification (TSI) and a DIS signal used to provide a special identifier of a side subscriber.

As such, when the environment for the transmission of the fax data is determined, the sender finally determines the transmission speed of the fax data between the sender / receiver through a training check (TCF) process, and the receiver responds to the TCF of the sender. It sends a CFR (confirmation to receive), which is a response signal confirming that the transmission of the network starts.

Phase C is a step of transmitting a message, confirming it, and maintaining synchronization.

Phase D is a process of terminating a message and terminating a reception. When continuous transmission is performed, phase D is sent to Phase B or Phase C and the transmission process is repeated.

That is, when the sender transmits an end of message (EOM) indicating the end of a completed page for the fax information to the receiver, the process returns to the phase B phase and the MPS (Multipage signal) indicating the end of the completed page. In case of transmitting to the receiving side, the process returns to Phase C phase, and when sending the end of page (EOP) indicating the end of one completed page and there are no more pages to the receiving side, Block it. Meanwhile, the receiving side transmits a message confirmation (MCF) to the transmitting side indicating that the completed one page is satisfactorily received.

After that, when the MCF is received from the receiving side, the transmitting side transmits a DCN (disconnect), which is a command indicating the end of communication, and cuts off the call.

When the fax data is transmitted between the transmitting side and the receiving side through the above protocol exchange, and an error occurs at the receiving side while the transmitting side transmits the fax data to the receiving side in step C, for example, If an error such as a paper jam, paper empty, toner low, memory full, etc. occurs, the receiving side sends a DCN because the receiving side can no longer receive data. Send to the side and cut off the call.

That is, if an error occurs on the receiving side during the transmission of the fax data, the call path is blocked. Therefore, the user of the receiving side facsimile performs a return operation with the sending side facsimile again after performing the return operation for the error occurring at the receiving side. Inconveniences that must be formed.

On the other hand, when the printing paper is exhausted while printing the fax data transmitted from the sending side fax on the printing paper, the receiving fax machine stores the received fax data in the memory. However, since the capacity of the memory is limited, receiving a certain amount of fax data causes an error in the memory pool so that the fax data can no longer be received.

Here, the sending side fax transmits the fax data according to DIS information that specifies the standard CCITT capability received from the receiving side facsimile in Phase B. If the receiving side facsimile supports 300 DPI reception, the fax data is transmitted to 300 DPI. If the receiving fax machine supports 200 DPI reception, it will send the fax data at 200 DPI.

At this time, the 300 DPI transmit and receive supports 2592 pixels (200 pixels), 200 DPI transmit and receive supports 1728 pixels (pixels), 300DPI transmit and receive is about twice the size of the data than 200DPI transmit and receive.

Therefore, an object of the present invention is to resolve the resolution of fax data received from the sender when the memory of the receiving fax is less than or equal to the preset value in order to prevent the memory of the receiving fax from being full while the fax data is transferred during the transmission of the fax data. To provide a resolution conversion method according to the remaining amount of memory to control the.

1 is a conceptual diagram showing a protocol for transmitting / receiving fax data;

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

3 is an operation flowchart for converting a resolution according to the present invention;

4 is a conceptual diagram illustrating a protocol for converting resolutions.

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

10: central processing unit 20: memory

30: operation panel 40: scanner

50: modem 60: NCU

70: printer 80: sensor

In order to achieve the above object, a feature of the present invention is to form a call path when a ring signal is input from a sending side facsimile, and when the sending side facsimile and the call path are formed, the remaining memory of the receiving side facsimile is determined. Checking; Receiving the fax data when the remaining memory amount is equal to or greater than a preset value, and converts the resolution of the fax data that can be received by a receiving side fax when the remaining memory amount is less than or equal to the preset value, and transmits the resolution of the converted receiving side fax. Transmitting the fax data to the receiving side according to the converted resolution at the transmitting side fax; Storing fax data received from the sending side facsimile in a memory; Checking a remaining amount of the memory when a page of fax data is received from the sending side fax; If the remaining amount of the memory is less than or equal to a preset value, the resolution of the fax data receivable at the receiving side fax is converted, the resolution of the converted receiving side fax is transmitted to the transmitting side, and the fax data is transmitted from the sending side fax. And transmitting to the receiving side according to the converted resolution.

Preferably, the resolution converting step converts a setting state of a predetermined bit that can specify a resolution among DIS (Digital Identification Signals) transmitted to the sending side facsimile in preparation for transmitting and receiving the fax data.

Here, the predetermined bit is bit 42 representing 300 DPI reception in the DIS.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if they are displayed on different drawings. In addition, in the following description there are shown a number of specific details, such as components of the specific circuit, which are provided only to help a more general understanding of the present invention that the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Figure 2 shows a schematic block diagram of a general facsimile applied to the present invention, Figure 3 shows an operational flow diagram for converting the resolution in accordance with the present invention, Figure 4 shows a protocol for converting the resolution A conceptual diagram is shown.

Referring to FIG. 2, the central processing unit 10 generally controls various operations of the facsimile according to a set program. In particular, when the remaining amount of the memory 20 is less than or equal to a preset value, the central processing unit 10 changes the resolution of the fax data. Retrain negative) is transmitted to the sender and control to retransmit DIS.

The memory 20 stores program data, protocol data, text data, work contents related to transmission and reception, and accesses or stores data under the control of the central processing unit 10, and particularly, of the present invention. According to an embodiment, the remaining amount of memory 20 for converting the resolution of received fax data is set. Here, when the resolution of the fax data transmitted / received by the sending side fax and the receiving side facsimile is 300 DPI (Dot Per Inch), the capacity of the receiving side memory for storing this is approximately twice as much as that of the 200 DPI.

The operation panel (OPE) 30 includes a plurality of keys capable of generating key data of the facsimile, and when the key data is generated, it is input to the central processing unit 10 and the display data of the central processing unit 10 is input. And a display window 35 that can be displayed.

The scanner 40 scans an image of an original, converts the image into digital image data, and transmits the image data to the central processing unit 10.

The modem 50 modulates the output data of the central processing unit 10 in an analog form under the control of the central processing unit 10, and demodulates and outputs the analog input signal.

The network control unit (NCU) 60 operates under the control of the central processing unit 10 to form a call loop of a general telephone network (consisting of rings and tips), and the modem 50 and the general telephone network (Tip, Interfacing the signal of the ring.

The printer 70 prints the received data according to a control signal from the central processing unit 10, and the sensor unit 80 detects a remaining amount of recording paper or a document and detects it on the central processing unit 10. The speaker 90 generates an alarm by the control signal output from the central processing unit 10.

An operation of the present invention having such a configuration will be described in detail with reference to FIGS. 3 and 4.

Here, it is assumed that the transmitting side facsimile and the receiving side facsimile applied to the present invention are facsimiles capable of supporting a resolution of 300 DPI (Dot Per Inch).

First, the CPU 10 checks whether a ring signal is received from the outside (S301), and forms a call path when the ring signal is received (S302). That is, as shown in Figure 4, when the CNG in the Phase A phase is received from the sending side facsimile is to transmit the CED to form a call path.

Before the transmission side facsimile and the communication path are formed and the phase B step is performed, the CPU 10 checks the remaining amount of the memory 20 (S303). In this case, the remaining amount of the memory 20 is checked to prevent the memory line from being pulled out before the reception of the fax data is completed when printing paper is exhausted and memory reception is performed.

As a result of the check, it is checked whether the remaining amount of the memory 20 is less than or equal to the preset value (S304). If the remaining amount of the memory 20 is less than or equal to the preset value, the CPU 10 transmits the sending side fax and the fax data. In the phase B phase, which is a preparation phase for receiving, when transmitting DIS characterizing the capability of the standard CCITT of the receiving side facsimile, the resolution of the receiving side facsimile is converted from 300 DPI to 200 DPI (S305).

Here, the bits designated to set the resolution related information among the DIS information transmitted to the transmitter are bits 15 and 42. Bit 15 represents 200 DPI (200 * 200) and bit 42 represents 300 DPI (300 * 300).

Therefore, since the transmitting side fax and the receiving side facsimile applied to the present invention support 300 DPI, the receiving side facsimile sets both bit 15 and bit 42 of the DIS information to '1' to enable both 200 DPI and 300 DPI. Send to the sender. However, since the remaining amount of the memory 20 is less than or equal to the preset value as a result of the check in step 304 (S304), the CPU 10 sets bit 42 of 300 DPI of the DIS information to '0' in step 305 (S305). By setting the resolution of the receiving side fax from 300 DPI to 200 DPI.

The central processing unit 10 transmits the DIS whose resolution is converted to the transmitting side. Accordingly, the transmitting side facsimile transmits the fax data at 200 DPI when transmitting the fax data in the phase C step shown in FIG.

The central processing unit 10 of the receiving side facsimile transmits the converted resolution information to the transmitting side, and then receives the fax data according to the protocol as shown in FIG. 1 (S306).

At this time, since the resolution of the fax data received from the sending side facsimile and stored in the memory 20 is 200 DPI, the memory capacity of approximately twice as much as the fax data of 300 DPI can be reduced.

On the other hand, if the remaining amount of the memory 20 is less than or equal to the preset value as a result of checking in step 304 (S304) of checking whether the remaining amount of the memory 20 is less than the preset value, the CPU 10 is shown in FIG. From step B of the protocol as described above to receive the fax data (S307). At this time, the received fax data has a resolution of 300 DPI.

The central processing unit 10 checks whether one page of data has been received while receiving the fax data transmitted from the sending side facsimile (S308), and checks whether the data of the next page exists when the reception of one page is completed ( S309).

That is, the central processing unit 10 checks whether the MPS (Multipage signal) is received from the transmitting side facsimile in the phase D phase after the data is received in the phase C phase shown in FIG. Here, MPS indicates the end of one page and indicates that the next page exists. Therefore, the central processing unit 10 checks whether the MPS is received from the sending side facsimile in step 308 (S308) and step 309 (S309).

If the data of the next page exists, that is, if the MPS is received from the sending side facsimile, the CPU 10 checks the remaining amount of the memory 20 (S310), and checks the remaining amount of the checked memory 20. Check whether or not the set value (S311).

If the remaining amount of the memory 20 is less than or equal to the preset value, the CPU 10 branches to step 305 (S305) of converting the resolution of the receiving side facsimile.

4, after the MPS is received from the sending side facsimile, the remaining memory 20 of the receiving side facsimile checked in step 311 (S311) is not sufficient to store the received fax data at 300 DPI. The receiving side facsimile transmits a RTN (retrain negative) to the transmitting side, indicating that the standard CCITT capability of the receiving side facsimile has been changed, and then transmitting the DIS including the converted resolution information back to the transmitting side facsimile.

On the other hand, after receiving the RTN from the receiving side facsimile, the transmitting side facsimile waits without transmitting the data of the next page, and when DIS is received from the receiving side facsimile, it performs from the phase B step and transmits the fax data according to the converted resolution. .

On the other hand, if the remaining amount of the memory 20 is not less than or equal to the preset value, the flow returns to step 307 (S307) for receiving the fax data transmitted from the sending side fax.

Further, if the MPS is not received from the sending side facsimile as a result of checking whether there is data of the next page, that is, checking whether the MPS is received from the sending side facsimile, the central processing unit 10 The operation is performed according to a predetermined signal received from the transmitting side facsimile (S312).

Therefore, since the resolution of the fax data is converted according to the remaining memory of the receiving side facsimile, the utilization of the memory can be maximized.

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 resolution conversion method according to the remaining memory amount according to the present invention, since the resolution of the fax data received from the sending side fax is stored according to the remaining memory of the receiving side facsimile, the memory utilization of the facsimile is maximized. There is an advantage that can receive more fax data.

Claims (4)

When a ring signal is input from the transmitting side facsimile, forming a call path; Checking a remaining memory amount of the receiving side facsimile when the communication path with the transmitting side facsimile is formed; Receiving the fax data when the remaining memory amount is equal to or greater than a preset value, and converts the resolution of the fax data that can be received by a receiving side fax when the remaining memory amount is less than or equal to the preset value, and transmits the resolution of the converted receiving side fax. Transmitting the fax data to the receiving side according to the converted resolution at the transmitting side fax; Storing fax data received from the sending side facsimile in a memory; Checking a remaining amount of the memory when a page of fax data is received from the sending side fax; If the remaining amount of the memory is less than or equal to a preset value, the resolution of the fax data receivable at the receiving side fax is converted, the resolution of the converted receiving side fax is transmitted to the transmitting side, and the fax data is transmitted from the sending side fax. And transmitting to the receiving side according to the converted resolution. Claim 2 has been deleted. The method of claim 1, wherein the resolution conversion step, And converting a setting state of a predetermined bit that can designate a resolution among DIS (Digital Identification Signals) transmitted to the sending side facsimile in a preparation step for transmitting and receiving the fax data. The method of claim 3, wherein the predetermined bit, And a bit number 42 indicating 300 DPI in the DIS.