JPH0614674B2 - Facsimile communication device - Google Patents

Description

Description: (a) Technical Field of the Invention The present invention relates to a facsimile communication apparatus, and more particularly to a facsimile communication apparatus capable of discriminating between a company's own machine and another company's machine.

(b) Background of technology In recent years, facsimile communication has been put into practical use, in which documents, figures, etc. are transmitted to a remote place using a communication line. Facsimile communication, as shown in FIG. 1, connects transmission / reception devices between users with a communication circuit to perform document communication with each other, and transmits image data of an image of a document original on the transmission side as an electric signal. The document is reproduced on the receiving side by printing on a thermal paper by a thermal printer, for example. There is also a method of using a public telephone line for the line.

The transmission / reception procedure in facsimile communication is generally performed according to the recommendation of the International Telegraph and Telephone Consultative Committee (CCITT), but a signal that allows the manufacturer to put in its own function outside the recommended range is specified. Therefore, each manufacturing company incorporates its own function into the signal and provides it to the user's own flights. However, since this optional function is effective only in counter communication between own machines, in order to use the optional function when performing facsimile communication through a public network such as a telephone network, the other party must have its own machine. There is a need for means for determining whether or not

(c) Prior Art and Problems Below, the second embodiment of the facsimile communication apparatus to which the present invention is applied is described.
Description will be made with reference to the block diagram of the drawing.

Facsimile communication is normally performed by forming a network by a device having a function of transmitting and receiving as a transmitting and receiving device as described above, but here, for simplification of explanation, transmission from the transmitting device to the receiving device is performed. It shall be.

FIG. 2 shows a block diagram of a transmitting device and a receiving device. In the figure, 1 is a transmitting device, 2 is a receiving device, 11 is a reading unit, 12 and 26 are operating units, 13 and 24 are control units, and 1
4, 23 are line memories, 15 is a compression unit, 16 and 21 are modems, 17 and 20 are transmission control units, 18 and 19 are network control units (hereinafter referred to as NCUs), 22
Indicates a decompression unit, and 25 indicates a recording unit.

The transmitting device 1 and the receiving device 2 are each configured in a range indicated by a chain line in the figure.

The reading unit 11 has a function of reading characters and the like on a document original with an image sensor (not shown) such as a charge coupled device (CCD) and sending them as image data.

The operation unit 12 performs a communication operation with the receiving device 2, and operates a communication response before the document transmission and a start of the document transmission.

The control unit 13 has a function of controlling each mechanical unit of the transmission device 1 and controlling data processing and transmission of image data.

The line memory 14 holds the image data input from the reading unit 11 and sends it to the compression unit 15.

The compression unit 15 has a function of compressing the image data sent from the line memory 14 and sending it out.

The modem 16 modulates the compressed image data and sends it out.

The transmission control units 17 and 20 have a function of controlling compression, expansion, and transmission / reception of data.

The NCUs 18 and 19 have a function of controlling connection and disconnection of the circuit switching network.

The modem 21 demodulates the received data.

The decompression unit 22 has a function of decompressing the received compressed image data.

The line memory 23 has a function of holding the image data expanded by the expansion unit 22 and sending it to the recording unit 25.

The control unit 24 has a function of controlling each mechanical unit of the receiving device 2 and controlling reception of image data and data processing.

The recording unit 25 has a function of recording the image data sent from the line memory 23 on a print sheet by, for example, a thermal printer (not shown).

The operation unit 26 performs a communication operation with the transmission device 1, and operates a communication of a document reception request and a set of document reception.

When communicating between the facsimile communication devices having such a structure and function through the public line, first, a circuit corresponding to a telephone (not shown) built in the NCU 18 of the transmitter 1 on the calling side is used to dial the public line. A call is made to the device and the communication path between the transmitting device 1 and the receiving device 2 is set according to the response from the called side. Following the response operation to the public line, the receiving device 2 transmits a called station identification signal for identifying the non-voice terminal to the calling side, and the transmitting device 1 receives the signal to communicate the line in the NCU 18. The circuit corresponding to the telephone for path setting is switched to the side of the data transmitting / receiving circuit such as the modem 16 and the facsimile communication is started. The switching is performed automatically or manually in the transmission device 1, but in the case of manual operation, it is performed by pressing a transmission button not shown in FIG. The receiving device 2 sends a series of signals including a function identification signal after the called station identification signal. The function identification signal includes a first function identification signal indicating that the receiving device 2 has a standard function according to the CCITT recommendation (in the case of a model that follows the GIII procedure of Recommendation T.30, a DIS signal: Digital Identifica
motion signal) and a second function identification signal (NS) indicating that the model includes an optional function outside the range of the recommendation.
F signal: Non-Standard Facilities) is included. The content of the NSF signal is not specified in the CCITT recommendation, and the mode unique to each manufacturer is used. NS
It is specified that the F signal is sent continuously with the DIS signal, but it is not sent if the called side has a model that does not have an optional function. Further, the series of signals including the first and second function identification signals are detected in the receiving device until the calling side detects the signal and sends the next command signal, or when the command is not sent. And time out (about 30 ~
40 seconds), the call is repeatedly sent from the called party with an interval of about 3 seconds. The calling side receives a series of signals including the function identification signal (hereinafter, simply referred to as "function identification signal") and detects only the DIS signal without detecting the NSF signal in the in-house mode. The signal of the command different from that at the time of detection is transmitted to the called side. Upon receiving the command signal, the called side stops sending the function identification signal, and sends information corresponding to the contents of the command signal to the calling side,
The calling side also sends information corresponding to the function identification signal of the called side to the called side. In the transmitter 1, after the communication is performed, the document set in the transmitter 1 is read by the reading unit 11, and the image data is compressed and modulated by the reader 11 via the line memory 14 to obtain the NCU.
The signal is transmitted from 18 to the receiving device 2 by a line.

In the receiving device 2, the image data received through the NCU 19 is demodulated and expanded, held in the line memory 23, and then sent to the recording unit 25 to be recorded on a print sheet.

Documents can be transmitted and received in this manner.

As described above, in the detection of the function identification signal in the series of operations, when the NSF signal in the own mode is detected, the called side device does not detect the NSF signal in the own machine and the own mode, and only the DIS signal is detected. In this case, it is necessary to determine that the called device is a standard procedure GIII machine that does not have its own optional function, that is, a machine of another company.

However, according to the conventional technique, when the transmitter 1 side is manually operated, it may not be possible to distinguish between the company's own machine and the other company's machine as described below, and it is impossible to use the optional function that is effective in the case of both company's machines. There are drawbacks.

That is, when the transmitter 1 is manually operated, the transmission button receives the called station identification signal from the called side and is pressed as described above. Is transmitted, the function identification signal is often already transmitted to the calling side when the transmission button is pressed. On the calling side, detection of the function identification signal for switching to the data transmission / reception circuit by pressing the transmission button is also started by pressing the transmission button. For this reason, if the transmission button is pressed while receiving the function identification signal, detection may start from the middle of the first (DIS) and second (NSF) function identification signals. For example,
When the detection is started in the middle of the NSF signal, the signal cannot be detected and only the DIS signal sent next is detected. Even if the NSF signal in the in-house mode is included, it is determined to be another machine. Resulting in.

As another conventional technique for eliminating the possibility of erroneous detection as described above, even if the transmission button is pressed, the detection system for the NSF and DIS signals is not immediately entered, but the detection system is set for the interval of the function identification signal repeatedly sent. There is a discrimination method to enter.

However, in this method, when the echo suppressor function is added to the transmission device 1, if the echo suppressor operates due to noise or the like when the transmission button is pressed into the transmission circuit, the reception signal is not received. May be mistaken for. Due to this erroneous recognition, detection is started when the interval is not a regular interval, and the effect of this determination method is lost, so this method is incomplete as a countermeasure.

(d) Object of the invention The object of the present invention is to solve the above-mentioned drawbacks, and it is possible to reliably distinguish between the own machine and another company's machine, and to use the optional function in the case of the own machine. To provide the equipment.

(e) Configuration of the Invention The present invention is directed to a detection / counting unit that detects and counts a first function identification signal, and a second function identification between a plurality of detections of the first function identification signal by the detection and counting unit. When a signal is detected,
A facsimile communication apparatus comprising: means for transmitting image data in response to a second function identification signal. By doing so, the object can be achieved.

(f) Embodiment of the Invention One embodiment of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 3 is a block diagram showing an embodiment according to the present invention, and FIG. 4 is a flow chart of FIG.

In FIG. 3, 27 is a frame extraction unit, 28 is a signal detection unit, 29 is a counter, 30 is a comparator, 31 is a control unit, 32 is a data creation unit, 33 is a frame creation unit, 3
Reference numerals 4 and 35 denote modems.

The frame extraction unit 27 has a function of extracting data from the signal transmitted in frame units.

The signal detection unit 28 detects the in-house mode NSF signal or DIS signal from the data extracted by the frame extraction unit 27, sends the detection signal to the control unit 31 if it is the in-house mode NSF signal, and detects it if it is the DIS signal. It has a function of sending a signal to the counter 29.

The counter 29 counts the signals sent from the signal detector 28 and sends the count value to the comparator 30 each time.

When the count value sent from the counter 29 becomes the same as the preset value (for example, 2) in the comparator 30, the comparator 30 judges that the called side is in the other company's mode and sends a signal to the control unit 31. At the same time, it has a function of clearing the counter 29.

The data creation unit 32 has a function of creating a response signal for another company's mode or data corresponding to an optional function in the in-house mode and sending it out according to a command from the control unit 31.

The frame creation unit 33 has a function of creating a frame unit to be transmitted.

With such a configuration and function, the signal from the line is demodulated by the modem 34, the data is extracted by the frame extractor 27, and the extracted data is detected by the signal detector 28.
In, when the in-house mode NSF signal is detected, the detection signal is sent to the control unit 31, and when the DIS signal is detected,
A signal is sent to the counter 29 for counting.

If the in-house mode NSF signal is not detected, the function identification signal is subsequently sent. Therefore, if the in-house mode NSF signal is detected by the signal detection unit 28, this detection signal is also sent to the control unit 31. Also, when the DIS signal is detected, the signal is sent to the counter 29. When the number of detections of the DIS signal counted by the counter 29 reaches the number set in the comparison unit 30, for example, 2, the comparison unit 3
When it is 0, it is judged as the other company's mode and the control unit 31 is notified.

As described above, the signal detector 28 and the comparator 30 are connected to the controller 31.
If the in-house mode NSF signal is detected even once during the multiple detections of the DIS signal, including the related operation with, the called side device is judged to be in the in-house mode, and the in-house mode NS is also detected.
When the F signal is not detected and the number of times the DIS signal is detected matches the preset number, it is determined that the called device is in the other company's mode. In the above detection method, the presence or absence of the in-house mode NSF signal is detected while counting the DIS signal a plurality of times. Therefore, if the signal is included, it can be reliably detected regardless of when the transmission button of the transmitter is pressed. it can.
When the control unit 31 determines that the mode is the in-house mode, the control unit 31 instructs the data creation unit 32 to create data corresponding to a predetermined optional function, the frame creation unit 33 sends the data in frame units, and the modem 35 modulates and sends the data. To do.

When it is determined to be the other company's mode, a normal response signal is created by the data creating unit 32 and similarly sent.

In this way, even in the case of manual transmission, it is possible to distinguish between the company's own machine and another company's machine without being affected by the timing of pressing the send button, and it is possible to effectively use the optional function in the case of both company's machines. .

In the above example, it takes NS until the DIS signal is counted twice.
Although the example of determining whether it is the own machine or the other company's machine depending on whether or not the F signal is detected has been described, by increasing the number of times the DIS signal is detected and giving the opportunity to detect the NSF signal multiple times. Therefore, the reliability of NSF signal detection can be further improved. For example, when the echo suppressor is used, the NSF signal can be reliably detected even if the echo suppressor operates due to noise when the transmission button is pressed and the signal being received is interrupted.

Further, instead of counting the number of times the DIS signal is detected by the counter 29, the time is counted from the first DIS signal detection, the predetermined time data is set in the comparator 30 in advance, and the time sent from the counter 29 is counted. The same effect can be obtained by the method of making a judgment depending on whether or not the NSF signal is detected before the time coincides with the set time. Even in this method, by taking a sufficient amount of time,
It is possible to prevent the influence of the malfunction of the echo suppressor.

In the above example, the transmitter side is set to the calling side and the receiving side is set to the called side, and the transmitting device 1 is provided with the signal detection unit 28 and the like. However, conversely, the transmitting side is set to the called side and the receiving side is set to the receiving side. The same effect can be obtained by applying it to the receiving device 2 when the calling side is used.

(g) Effects of the Invention As described above, according to the present invention, it is possible to easily distinguish between the own machine and other companies' machines, and to use the optional functions required when the two machines are in-house. .

[Brief description of drawings]

1 is an explanatory view showing facsimile communication, FIG. 2 is a block diagram showing a facsimile communication apparatus to which the present invention is applied, FIG. 3 is a block diagram showing an embodiment according to the present invention, and FIG. 4 is FIG. It is a flowchart of. In the figure, 1 is a transmitting device, 2 is a receiving device, 11 is a reading unit, 12 and 26 are operating units, 13, 24 and 31 are control units,
14 and 23 are line memories, 15 is a compression unit, and 16 and 2.
1, 34 and 35 are modems, 17 and 20 are transmission control units, 1
8 and 19 are NCUs, 22 is an extension unit, 25 is a recording unit, and 27
Is a frame extracting unit, 28 is a signal detecting unit, 29 is a counter, 30 is a comparator, 32 is a data creating unit, and 33 is a frame creating unit.

Claims (1)

[Claims] 1. After the calling device detects first and second function identification signals indicating a standard function and a non-standard function in its own mode, which are repeatedly transmitted from the called device, the first and second function identification signals are detected. A facsimile communication device for transmitting or receiving image data according to a function identification signal to or from the called device, said detection / counting means for detecting and counting said first function identification signal; And a means for transmitting image data according to the second function identification signal when the second function identification signal is detected during the detection of the first function identification signal by the counting means a plurality of times. Facsimile communication device.