KR20050108969A - Apparatus and method of data exchange in facsimile - Google Patents

Abstract

The present invention relates to a method and apparatus for data exchange of a facsimile, wherein a facsimile or signal drop occurs while receiving an image data through a communication network. By avoiding error processing to terminate the path, it is possible to continuously receive the image data according to the detection state of the analog signal, thereby preventing the call rate increase problem caused by the transmission fax retransmitting the entire image data according to the line state. This is to maximize the image data communication rate between each facsimile.

Description

Apparatus and method of data exchange in facsimile}

The present invention relates to a method and apparatus for data exchange of a facsimile, and more particularly, when a surge or signal drop occurs in a line with a communication path for facsimile exchange of image data through a communication network, a receiving facsimile transmits a facsimile. A method and apparatus for data exchange of a facsimile for continuously receiving image data transmitted from the same.

In general, a facsimile is the transmission of scanned data (text or image) to a printer or output device connected to a separate telephone number by using a telephone line. When the original document is read through the fax, Treats this as a fixed graphic image, converts it into a bitmap, and transmits the data as an electrical signal through the telephone system.

The facsimile receiving the electrical signal restores the coded image and prints it.

And, in order to exchange the scanned data, the facsimile is' T. Communicate using 30 'protocol.

'T. The 30 'protocol is a protocol for handling communications, regardless of the actual transmission of the scanned information with machines, and defines call tones, function exchange tones, tones to indicate the end and beginning of the page, and so on.

For example, T 30 defines the tone indicating the beginning of a call of a facsimile and the transmission rate, resolution, etc. of the data sent between the facsimile during the call.

Looking at the message exchange in a general fax for a while, first set a plurality of transmission documents to be sent by the user to the transmission fax.

The transmission facsimile transmits a call tone (CNG) indicating the start of transmission to the reception facsimile.

The receiving facsimile detects whether a call tone (CNG) from the transmit facsimile has been transmitted, and if the call tone (CNG) is not received from the transmit facsimile for a predetermined time, turns off the connector (DCN) to stop transmission.

On the other hand, when a call tone (CNG) is received from the transmission facsimile within a predetermined time, a response signal (CED: Called Station Identification) is transmitted to the transmission facsimile for a predetermined time.

Then, the time is searched while transmitting a digital identification signal (DIS) representing a standard function of a called station of the International Telegraph Telephone Advisory Committee (CCITT) for a predetermined time, and the transmission time of the called station identification signal (DIS) is increased. If it passes, the transmission will be aborted

If the predetermined time has not elapsed, the transmitting fax transmits a response signal (DCS: Digital Command signal) to the receiving station identification signal (DIS) as a receiving fax, and transmits a transmission speed control signal (TCF: Training Check). Send to receive fax for time.

In response, the receiving facsimile establishes a communication path by transmitting a message receiving signal (CFR: Confirmation To Receive) to the transmitting facsimile in response to the received transmission rate control signal.

Then, the transmitting fax transmits the image data of the first page of the original to the receiving fax.

After the transmission of the image data of the first page original is completed, a multipage signal (MPS: Multi Page Signal) is sent to the receiving facsimile to indicate that there is a next page after the transmission of one page is completed, and the receiving facsimile is the image data of the first page. If the received data is lost, and a part of data of the received page is lost, a retraining negative signal (RTN: Retraining Negative) is transmitted to the transmission facsimile.

In order to readjust the communication speed, the transmission facsimile retries from the initial process of preparing the message transmission, that is, transmits a response signal DCS to the receiving facsimile for the retraining negative signal RTN received from the reception facsimile. The transmission rate control signal TCF is transmitted to the receiving facsimile for a predetermined time.

When the receiving fax receives the RTN from the receiving facsimile, the transmitting fax retransmits the corresponding page in which the error occurs.

The receiving facsimile sends a message receiveable signal (CFR) to the sending facsimile in response to the transmission rate adjustment signal, and the sending facsimile sends the second and third page originals to the receiving facsimile through the message sending step.

As such, when transmission is completed to the last page original to be transmitted, the transmission facsimile transmits a transmission completion signal (EOP: End Of Procdure) to the reception facsimile through the message transmission decision step.

When the reception facsimile receives the transmission completion signal (EOP) from the transmission facsimile, the reception facsimile transmits a message confirmation signal (MCF) to the transmission facsimile in response. You are done.

In this way, the functions of the message of a general facsimile can be described as Table 1 below.

Abbreviation function CED Called station identification CFR confirmation to receive CNG Calling tone CSI Called subscriber identification DCN Disconnect DCS Digital command signal DIS Digital identification signal EOP End of procedure MCF Message confirmation NSF Non-standard page signal PPS Partial page signal TCF Training check

However, in a typical facsimile, a communication path is established and a surge or signal drop occurs in a line while receiving image data, thereby causing line error processing, that is, interrupting the communication path.

In other words, the receiving facsimile detects an analog signal corresponding to the image data through the line, and if a surge or signal drop occurs in the line, the receiving facsimile checks the Receive Line Signal Detector (RLSD) bit to turn off. In this case, line error processing was performed.

Therefore, the communication path between each facsimile is established and the communication path is interrupted while transmitting the image data corresponding to the entire originals while exchanging the image data, which causes a problem that the sender must retransmit the image data for the entire originals. do.

Accordingly, the present invention has been made to solve the above problems, when a facsimile connected through a communication network establishes a communication path and an error occurs in the image data due to a surge or signal drop while receiving the image data. It is an object of the present invention to provide a method and apparatus for facsimile data exchange that can continuously receive image data.

A facsimile data exchange device for exchanging analog signals according to image data through a communication path according to an aspect of the present invention for achieving the above object, by detecting the energy state or reception state of the analog signal received through the communication path And a mode setting control unit for setting an operation mode of the fax according to the detection result.

In addition, the mode setting controller according to the present invention turns off a Receive Line Signal Detector (RLSD) bit according to a reception state of an analog signal to provide an RLSD detection signal, and uses a fast energy detector (FED) according to an energy state of the analog signal. A signal detector for turning off or turning on the bit to provide an FED off detection signal or an FED on detection signal, and if the FED off signal is received after the RLSD detection signal is provided from the signal detector, whether the FED bit is turned on for a predetermined time; If it is confirmed that the FED bit is turned on, the mode setting unit for setting the operation mode of the facsimile to the protocol mode that can detect the received protocol signal.

On the other hand, the method of data exchange of the facsimile according to another aspect of the present invention, the step of turning off the Receive Line Signal Detector (RLSD) bit according to the reception state of the analog signal received from the other facsimile through the communication path, When the energy state is detected, setting a protocol mode capable of detecting a protocol signal transmitted from another facsimile, detecting a protocol signal received through a communication path, and if no energy is detected in the analog signal, FED (Fast) Energy detector) turning off the bit, and determining whether the FED bit is turned on within a predetermined time, and when turned on, setting a protocol mode to receive an analog signal continuously transmitted from another facsimile. do.

And, the method of data exchange of the facsimile according to the present invention further comprises the step of performing a line error processing to terminate the communication path for receiving an analog signal, if the FED bit is not turned on within a predetermined time.

Hereinafter, a method and apparatus for data exchange of a facsimile according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a communication network of a facsimile to which the present invention is applied.

Referring to FIG. 1, each facsimile 100, 100 ′ is connected through a communication network 1.

The communication network 1 to which each of the facsimile machines 100 and 100 ′ is connected may correspond to a public switched telephone network (PSTN).

When the user requests transmission of image data, each facsimile 100, 100 'sets a communication path with another facsimile 100, 100' through the communication network 1 according to a protocol, and transmits the image data. .

2 is an internal block diagram illustrating a configuration of a facsimile according to a preferred embodiment of the present invention.

2, the facsimile 100 according to the present invention includes a control unit 110, a modem unit 120, a line interface unit 130, a scanner unit 140, a storage unit 150, and an image forming unit ( 160, the modem unit 120 includes a signal detector 121, and the controller 110 includes a mode processor 111.

The storage unit 150 stores program information, protocol information, and image data exchanged through the communication network 1 for driving the facsimile 100.

The line interface unit 130 receives the signal transmitted from the other facsimile 100 'through the communication network 1 and provides the signal to the modem unit 120, and the facsimile 100 transmits the other facsimile 100'. Interface the signal to be transmitted to the communication network (1).

The modem unit 120 converts a signal provided from the line interface unit 130 to the control unit 110, converts a signal transmitted from the control unit 110, and converts a signal transmitted from the control unit 110 to the communication network 1 through the line interface unit 130. To send.

That is, the modem unit 120 converts an analog signal received through the communication network 1 into digital data and provides it to the controller 110, and converts digital data transmitted from the control unit 110 into an analog signal to convert the other signal ( 100).

In this case, the modem 120 converts a signal, and a modulation scheme such as frequency shift keying (FSK), differential phase shift keying (DPSK), quadrature amplitude modulation (QAM), or the like may be used.

In general, the facsimile (100) protocol signal uses the FSK modulation method, and the analog signal according to the image data using the DPSK or QAM modulation method.

The signal detector 121 of the modem unit 120 detects an analog signal received through the line interface unit 130 and provides a detection signal according to the state of the analog signal.

That is, the signal detector 121 detects an analog signal received from another facsimile 100 in a state where each facsimile 100 has a communication path set, checks a register bit according to the state of the analog signal, and accordingly a detection signal. To provide.

For example, when a situation such as a surge or a signal drop occurs in a line composed of the communication network 1, the analog signal transmitted through the line does not include normal information, and the signal detector 121 receives the received analog. The signal is turned off to turn off the Receive Line Signal Detector (RLSD) bit, and the FED bit is turned off or turned on by detecting whether energy is included in the analog signal.

The signal detector 121 checks each bit and provides a detection signal according to the state of the analog signal to the controller 110.

That is, if information modulated to the analog signal is not detected, the signal detector 121 turns off the RLSD bit, provides the RLSD detection signal to the controller 110, and detects whether the analog signal includes energy. Provide an FED detection signal.

The scanner unit 140 reads an image formed on a sheet according to a user's request and provides the image data to the controller 110.

The image forming unit 160 forms an image on the paper according to the image data transmitted from the control unit 110.

That is, the image forming unit 160 applies an image developer to the paper according to the image data transmitted from the control unit 110 to perform an image forming operation so that the user can recognize the image.

The controller 110 sets up a communication path with another facsimile 100 by using each piece of information stored in the storage 150, and performs an image forming job based on image data, which is digital data transmitted from the modem unit 120. To control.

In addition, the control unit 110 transmits the image data provided from the scanner unit 140 through the established communication path. In this case, the controller 110 transmits the image data to the modem unit 120, and the modem unit 120 converts the image data into an analog signal and transmits the image data to the other facsimile 100 through the line interface unit 130.

On the other hand, the mode processing unit 111 of the control unit 110, when the facsimile 100 receives the image data by establishing a communication path with the other facsimile 100, the image data according to the detection signal transmitted from the signal detector 121 The data mode of receiving the signal and transmitting the image to the image forming unit 160 is maintained.

For example, when an error occurs in an analog signal transmitted due to a surge or a signal drop while the facsimile 100 receives image data, the signal detector 121 does not include the information in the analog signal, and thus the RLSD bit is not included. After turning off and transmitting the RLSD detection signal to the mode processing unit 111, it detects whether the analog signal contains energy, and if the energy is included, transmits the FED on detection signal and does not include energy. If not, send a FED off detection signal.

In this case, when the RLSD is detected while the communication path is established and the image data is received, the signal detector 121 repeatedly detects the analog signal for a predetermined time and transmits the FED detection signal. It is preferable to repeatedly detect the signal error occurrence time due to 100 ms.

When the RLSD detection signal is received from the modem unit 120, the mode processing unit 111 recognizes that an error has occurred in the analog signal, checks whether the FED detection signal is transmitted from the modem unit 120, and detects the FED. When the FED on detection signal is received in the signal, an error processing for a line for which a communication path is set, that is, a protocol mode for continuously receiving image data transmitted from another facsimile 100 without terminating the communication path is set.

That is, when the FED on detection signal is received from the signal detector 121, the mode processor 111 sets a protocol mode in which the modem 120 may receive a protocol signal transmitted from the transmission facsimile 100.

For example, when a protocol signal is transmitted from the transmission facsimile 100 in the FSK modulation scheme, the mode processing unit 111 sets the protocol mode so that the modem unit 120 may detect an analog signal modulated in the FSK modulation scheme. do.

On the other hand, when the RLSD detection signal is received from the modem unit 120 and the FED off detection signal is received, the mode processing unit 111 checks again whether or not the FED on detection signal is received within a predetermined time.

When the FED off detection signal is received and the FED on detection signal is received within a predetermined time, the mode processing unit 111 sets a protocol mode, and when the FED off detection signal is received, an error to terminate the set communication path. Set the processing mode.

3 is a flowchart illustrating a flow of a method of data exchange of a facsimile according to a preferred embodiment of the present invention.

Referring to FIG. 3, when a user requests image data transmission, the transmission facsimile 100 sets up a communication path with the reception facsimile 100 according to the protocol (S 1).

Then, the transmission facsimile 100 transmits the image data according to the image formed on the sheet of paper inserted by the user to the receiving facsimile 100 (S 2).

At this time, the scanner unit 140 of the transmission facsimile 100 reads the image formed on the sheet inserted into the paper stand and transmits the image data to the control unit 110, the control unit 110 transmits the image data to the modem unit ( 120).

The modem unit 120 converts the provided image data into an analog signal and transmits the converted image data to the receiving fax machine 100 through the line interface unit 130.

The receiving facsimile 100 receives the image data through the established communication path (S 3).

The signal detector 121 of the receiving facsimile 100 checks whether the RLSD is detected while detecting the transmitted analog signal, and when the RLSD is detected, turns off the corresponding RLSD bit and outputs the RLSD detection signal to the mode processing unit ( 111).

In addition, the signal detector 121 transmits the RLSD detection signal to the mode processor 111 to detect whether energy is included in the received analog signal and transmits the FED detection signal.

The mode processing unit 111 checks whether the RLSD detection signal is received from the signal detection unit 121 (S4). If the RLSD detection signal is not received, the mode processing unit 111 receives image data and performs image forming operations according to the image data. The data mode to be performed is maintained (S 5).

That is, the modem unit 120 converts an analog signal received through the line interface unit 130 into image data, which is digital data, and provides the image data to the controller 110, and the controller 110 provides the image data to the image forming unit 160. ) To control the image forming operation according to the image data.

On the other hand, when the RLSD detection signal is received, the mode processing unit 111 checks whether the FED detection signal is received from the signal detection unit 121 (S6).

That is, the mode processing unit 111 receives the RLSD detection signal and checks whether the FED off signal is received from the signal detection unit 121, and when the FED off signal is received, waits for a predetermined time (S 7) Check the FED detection signal transmitted from the detector 121.

In this case, the mode processing unit 111 waits for a predetermined time, typically 100 ms, which is a signal error occurrence time due to a surge or a signal drop, and again processes the line error according to the detection state of the analog signal. To determine the error.

When the FED off signal is received from the signal detector 121 after a predetermined time, the mode processing unit 111 terminates the line error processing, that is, the established communication path (S 8).

That is, the mode processing unit 111 sets an error processing mode for terminating the set communication path when the FED is not turned on from the signal detecting unit 121 so that the facsimile performs line error processing.

On the other hand, if the FED on signal is received from the signal detector 121 after a predetermined time, the mode processing unit 111 sets the protocol mode in which the facsimile 100 can receive the protocol signal (S 9).

That is, if a surge or signal drop occurs while the transmission facsimile 100 transmits data for a plurality of sheets of images, the mode processing unit 111 is configured to transmit the next sheet continuously transmitted from the transmission facsimile 100. Image data should be received.

Therefore, the mode processing unit 111 sets the protocol mode so that the modem unit 120 may receive a plurality of signals (MPS: Multi Page Signal), which are protocol signals transmitted from the transmission facsimile 100.

When the protocol mode is set, the modem unit 120 detects a protocol signal transmitted from the transmission facsimile 100, converts an analog signal received through a communication path into image data, and transmits the image to the control unit 110.

The control unit 110 transmits the image data received from the modem unit 120 to the image forming unit 160 and controls the image forming operation.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and changes are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims.

As described above, according to the present invention, when a facsimile or signal drop occurs while the facsimile is receiving image data through a communication network, the receiving facsimile is continuously imaged according to a detection state of an analog signal received through a line. By allowing data to be received, it is possible to prevent a call rate increase problem caused by the transmission fax retransmitting the entire image data according to the line state, and to maximize the image data communication rate between each fax.

1 is a block diagram illustrating a communication network of a facsimile to which the present invention is applied.

2 is an internal block diagram illustrating a configuration of a facsimile according to a preferred embodiment of the present invention.

3 is a flow chart for explaining the flow of the method of data exchange of the facsimile according to a preferred embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: facsimile 110: control unit

111; Mode processing unit 120: Modem unit

121: signal detection unit 130: line interface unit

140: scanner unit 150: storage unit

160: image forming unit

Claims (5)

In a fax that exchanges analog signals in accordance with image data through a communication path, And a mode setting control unit for detecting an energy state or a reception state of the analog signal received through the communication path, and setting an operation mode of the fax according to the detection result. The method of claim 1, wherein the mode setting control unit, Turn off the Receive Line Signal Detector (RLSD) bit according to the reception state of the analog signal to provide an RLSD detection signal, and turn off or turn on the Fast Energy Detector (FED) bit according to the energy state of the analog signal to FED. A signal detector for providing an off detection signal or an FED on detection signal; When the FED off signal is received after the RLSD detection signal is provided from the signal detection unit, it is determined whether the FED bit is turned on for a predetermined time, and when the FED bit is turned on, a protocol for receiving the operation mode of the facsimile is received. And a mode setting unit for setting a protocol mode capable of detecting a signal. The method of claim 2, wherein the mode setting unit, And set the operation mode of the facsimile to an error processing mode for terminating the communication path if the FED bit is not turned on during the predetermined time. In the method for the fax to receive the analog signal according to the image data through the communication path, Turning off a Receive Line Signal Detector (RLSD) bit according to a reception state of an analog signal received from another facsimile through the communication path; Detecting a protocol signal received through the communication path by setting a protocol mode capable of detecting a protocol signal transmitted from the other facsimile when the energy state of the analog signal is detected; If energy is not detected in the analog signal, turning off a fast energy detector (FED) bit; Determining whether the FED bit is turned on within a predetermined time, and if it is turned on, setting the protocol mode to receive an analog signal continuously transmitted from the other facsimile. The method of claim 4, wherein And performing line error processing to terminate the communication path receiving the analog signal when the FED bit is not turned on within a predetermined time.