JPH0697777B2 - Communication device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a communication device for exchanging data via a communication line, and more particularly to a communication device for transmitting data using an international line or the like.

[Prior Art] As a communication device of this type, for example, a facsimile device for transmitting and receiving image information is known. In a conventionally known facsimile machine, when making a call from the facsimile machine in the automatic transmission mode, it is possible to recognize that the machine itself is the calling side and execute a predetermined control procedure. It is possible. However, when a call is made from the telephone to the communication partner, it is not configured to recognize or detect whether or not the device itself is the calling side.

During the transmission of data from the calling side to the called side by issuing an echo suppressor function stop tone to the data line terminating device side before starting a predetermined communication via the international communication line. Also, it is possible to transmit a control signal from the called side to the calling side (so-called full-duplex operation).

However, even if the echo suppressor disabling tone is sent in advance in such an international communication, contrary to the above case, the caller side is in the middle of transmitting data from the callee side to the caller side. Full-duplex operation of transmitting control signals to the called party was not possible. Therefore, in this latter situation (when transmitting data from the called side to the calling side),
When "Continuous (Error) retransmission" is performed, the transmitter of image information cannot detect a control signal (for example, a NACK signal sent when a reception error occurs), and as a result, The major drawback was that communication was impossible.

The term "continuous error retransmission" used here means
An error retransmission method based on full-duplex operation. That is, if the receiving side detects an error while sending the image information from the sending side, the receiving side sends a NACK signal to the sending side at that time to stop the transmission of the image information, and then the error It refers to the method of retransmitting image information from the generated address, frame, line, etc.

[Objective] In view of the above points, an object of the present invention is to perform error retransmission before data communication starts based on an international communication instruction from an operator and a result of determination as to whether or not a calling party. Another object of the present invention is to provide a communication device capable of controlling data transmission without any trouble by selecting whether to start data communication at low speed.

In order to achieve such an object, in the present invention, a first mode for performing data communication by error resending, a communication means capable of performing data communication in a second mode for starting data communication at low speed, and international communication are provided. Based on the instruction means manually instructed by the operator, the determination means for determining whether or not the calling side, the instruction by the instruction means and the determination result of the determination means, before the start of data communication, It is provided with means for selecting whether to perform communication in one mode or communication in the second mode and executing a communication procedure so that communication is performed in the selected mode.

[Examples] Hereinafter, the present invention will be described in detail based on Examples.

First, an outline of a facsimile apparatus to which the present invention is applied will be described.

The facsimile machine (receiver) on the receiving side determines whether or not the facsimile machine (transmitter) on the transmitting side has a function of performing continuous error retransmission by using an initial identification signal (NSF signal) having a non-standard function. ). this is,
For example, it is performed by allocating a specific bit of FIF (facsimile information field) in the NSF signal. For example, if the FIF 50th bit of the NSF signal is "0", it does not have the function of performing continuous error retransmission, and if the FIF 50th bit of the NSF signal is "1". This means that it has the function of performing continuous error retransmission.

Also, on the transmitter side, it is determined whether the operator has selected the operation in the continuous error reproduction mode or the international communication button has been pressed.

First of all, the outline of the case where the receiver of the communication partner has the continuous error retransmission function and the operator on the transmitter side selects the continuous error retransmission mode and the international communication button is pressed The operation will be described.

In this case, the transmitter recognizes whether it is the calling side or the called side by the calling side identification means described later in detail.
When the transmitter is the calling side, the image information is transmitted according to the continuous error retransmission mode. The declaration of transmission in this continuous error retransmission mode is
Performed by NSS signal. If the transmitter is the called side, low speed image information transmission is started. Declaration of transmission from this low speed is done by DCS signal.

When the operator of the transmitter does not select the continuous error retransmission mode, normal image information is transmitted. In this case, it is irrelevant whether or not the receiver has the continuous error resending function, or whether or not the operator on the transmitter side presses the international communication button.

If the receiver on the transmitter side does not have the continuous error resending function despite the operator selecting the continuous error resending mode, transmission of image information from a low speed is started. In this case, it is irrelevant whether or not the operator on the transmitter side presses the international communication button.

If the receiver has the continuous error resend function and the operator on the transmitter side has selected the continuous error resend mode, and the international communication button is not pressed, the continuous error resend mode is used. Transmission.

Next, one embodiment of the facsimile apparatus to which the present invention is applied will be described in detail.

FIG. 1 is a block diagram showing the configuration of the transmission side of a facsimile apparatus which is an embodiment of the present invention.

In FIG. 1, 2 is a network control unit NCU (Network Control
Unit), which controls the connection of the telephone switching network by connecting the telephone network to the terminal of the line to use for data communication, switches to the data communication path, and holds the loop. The communication line 2a indicates a telephone line. This NC
U2 inputs the signal on the signal line 36a. If this signal level is "0", the telephone line is connected to the telephone side (that is,
2a to the signal line 2b side). NUC2 is signal line 36a
If the signal level is "1", the telephone line is connected to the facsimile machine side (that is, the signal line 2a side to the signal line 2c side). In the normal state, the telephone line is connected to the telephone side.

Reference numeral 4 is a telephone.

Reference numeral 6 is a hybrid circuit for separating a transmission system signal and a reception system signal. That is, the transmission signal of the signal line 18a is sent to the telephone line via the signal line 2c and NCU2. Further, the signal sent from the communication partner side is output to the signal line 6a via the NCU 2 and the signal line 2c.

A reading circuit 8 sequentially reads image information for one line in the main scanning direction from a document to be transmitted, and creates a signal string representing binary values of white or black. The reading circuit 8 is composed of an image pickup device such as a CCD (charge coupled device) and an optical system.
Then, the binarized signal string representing the binary of white or black is output to the signal line 8a.

Reference numeral 10 is an encoding circuit, which is a circuit that inputs the binarized data output to the signal line 8a and performs encoding. The encoding circuit 10 has a memory necessary for performing retransmission. When the signal level of the signal line 36d is "0", normal transmission encoding is performed. When the signal level of the signal line 36d is "1", encoding is performed by continuous error retransmission. Here, when the continuous error retransmission mode is selected, the operation according to the following control is performed. First, when the signal level of the signal line 36b becomes "1", the transmission of image information is interrupted. Next, when the signal level of the signal line 36b becomes "0", the retransmission start line information output to the signal line 36c is input and the retransmission from this line is performed. Then, MH (Modified Huffman) coded data, MR (Modified Read) coded data, or data coded for error retransmission is output to the signal line 10a.

Reference numeral 12 is a modulator that performs modulation based on the well-known CCITT recommendation V27ter (differential phase modulation) or V29 (quadrature modulation). The modulator 12 receives the signal on the signal line 10a, modulates the signal, and outputs the modulated data to the signal line 12a. Here, when the signal level of the signal line 36e is "0", transmission from a high speed (for example, V299 600 bit / sec) is tried. When the signal level of the signal line 36e is "1", transmission from a low speed (for example, V27ter 4800bit / sec) is tried.

Reference numeral 14 is a modulator that performs modulation based on the well-known CCITT recommendation V21. The modulator 14 receives the procedure signal on the signal line 36f, modulates the procedure signal, and outputs the modulated data to the signal line 14a.

Reference numeral 16 denotes an echo suppressor function stop tone generating circuit, which generates an echo suppressor function stop tone on the signal line 16a when a pulse is generated on the signal line 36g. In this embodiment, as the echo suppressor function stop tone,
Keep the 2100Hz signal for 1 second. Then, at the time when the transmission of the echo presser stop tone is completed,
A tone transmission end pulse is transmitted to the signal line 16b.

Reference numeral 18 denotes an adder circuit, which includes the signal line 12a, the signal line 14a, and the signal line 16a.
Signal is input and the addition result is output to the signal line 18a.

Reference numeral 20 is a demodulator that performs demodulation based on the well-known CCITT recommendation V21. This demodulator 20 receives the signal on the signal line 6a and outputs V2
1 Demodulates and outputs the demodulated data to the signal line 20a.

Reference numeral 22 denotes a NACK signal detection circuit, which inputs the signal on the signal line 6a and generates a pulse on the signal line 22a when the NACK signal transmitted from the facsimile machine on the other side is detected.

A retransmission start line detection circuit 24 detects the retransmission start line number transmitted subsequently to the NACK signal and outputs the line number to the signal line 24a.

Reference numeral 26 is a selection signal sending circuit, which inputs the dial number information output to the signal line 36i when a pulse is generated on the signal line 36h, and sends the selection signal to the signal line 26a. This dial number is designated by the operation unit 30 described later. As a dial number input method from the operation unit 30, there are a one-touch dial method, a speed dial method, a ten-key method, and the like. Further, a DC impulse or a push button dial signal can be used as the selection signal.

Reference numeral 28 denotes a selection signal detection circuit, which inputs a signal of the signal line 2b and detects whether or not the selection signal is transmitted from the telephone. As the selection signal, a DC impulse or push button dial signal is used. When the selection signal is sent from the telephone, the selection signal detection circuit 28 outputs a signal of signal level "1" to the signal line 28a. Also,
When the line is disconnected, the selection signal detection circuit 28
The signal of the signal level "0" is output to. Then, when the selection signal is sent from the telephone or when the selection signal is sent from the selection signal sending circuit 28 and the line is connected, the facsimile apparatus recognizes that it is on the calling side.

30 is an operation unit. This operation department
30 includes a start key, a mode setting key, a numeric keypad, an alphabet key, a one-touch key, and the like.
The information signal input from the operation unit 30 is output to the signal line 30a.

Reference numeral 32 is a circuit for detecting whether or not the operator has selected the continuous error reproduction mode. The detection circuit 32 outputs a signal of signal level "0" to the signal line 32a when the operator does not select the continuous error retransmission mode. Further, this detection circuit 32 outputs a signal of signal level "1" to the signal line 32a when the operator selects the continuous error retransmission mode.

Reference numeral 34 is a circuit that detects whether or not the operator is pressing the international communication button. The international communication button press detection circuit 34 outputs a signal of signal level "0" to the signal line 34a when the operator does not press the international communication button. When the operator presses the international communication button, the signal of the signal level "1" is output to the signal line 34a.

36 is a control circuit that performs the control described below.

Here, a case where one call connection is established and facsimile transmission is performed will be described as an example.

When the receiver of the communication partner has the continuous error resending function and the operator on the transmitter side selects continuous error resending, when the international communication button is pressed, the transmitter Recognize if there is or is the called party. As a result, when the transmitter is the calling side, transmission is performed in the continuous error retransmission mode. Further, when the transmitter is the called side, image information transmission from a low speed is started.

When the operator on the transmitter side does not select the continuous error retransmission mode, normal transmission is performed. In this case, it is irrelevant whether or not the receiver has a continuous error resending function, or whether or not the operator on the transmitter side presses the international communication button.

Even if the operator on the transmitter side selects the continuous error retransmission mode, if the receiver does not have the continuous error retransmission function, it starts image information transmission from a low speed. . In this case, it is irrelevant whether or not the operator on the transmitter side presses the international communication button.

When the receiver has the continuous error resend function, the operator on the transmitter side selects the continuous error resend mode, but when the international communication button is not pressed, the continuous error is sent. Image information is transmitted in the retransmission mode.

Here, the image information transmission in the continuous error retransmission mode is declared by the NSS signal. The DCS signal is used to declare the transmission of image information from low speed.

FIG. 2 is a flow chart showing a control procedure to be executed by the control circuit 36 shown in FIG.

In FIG. 2, in step S50, the telephone line is connected to the telephone side. That is, the signal of the signal level "0" is output to the signal line 36a.

In steps S52 to S64, in the manual / automatic line connection, the HASSIN flag is set to "1" for the calling side and the HASSIN flag is set to "0" for the called side.

That is, "0" is set to the HASSIN flag (step S5
2) Then, the start factor of the facsimile machine is checked (steps S54, S56, S58). When there is a call from the operation section (the control circuit 36 inputs the dial number from the signal line 30a and the selection signal sending circuit 26 sends the selection signal), or after calling from the telephone, the start button When pressing, the HASSIN flag is set to "1".
Is set (step S64). Other activation factors,
That is, the HASSIN flag is not set when an automatic incoming call is made or when the start button is pressed after a manual incoming call is made.

Even when operating in the manual mode (that is, when the start button is pressed after connecting the line using the telephone), it is identified whether the facsimile machine is the calling side or the receiving side. However, there is a feature of this embodiment. This identification is based on the selection signal detection circuit 28
(Corresponding to the determination in step S60).
That is, in step S60, the signal of the signal line 28a is input, and if it is the signal level "1", it is determined that the telephone call is made.

After being activated by various activation factors, the telephone line is connected to the facsimile device side (steps S58, S59, S62). This connection control is performed by outputting a signal of signal level "1" to the signal line 36a.

In step S66, it is determined whether or not the continuous error retransmission mode has been selected, that is, whether or not the signal line 32a is at the signal level "1". Here, when the continuous error retransmission mode is selected, that is, when the signal line 32a is at the signal level 1 ", step S74.
Proceed to. On the other hand, when the continuous error retransmission mode is not selected, that is, when the signal line 32a is at the signal level "0", the process proceeds to step S68.

Step S68 represents a pre-procedure. Here, the normal transmission mode is declared by the NSS signal.

Step S70 represents normal image transmission. That is, the signal of the signal level "0" is output to the signal lines 36d and 36e.

Step S72 represents a post procedure.

In step S74, it is determined whether or not the receiver has the continuous error retransmission function. this is,
It is determined by the procedure signal (NSF signal) output to the signal line 20a. If the receiver has the continuous error resending function, the process proceeds to step S76. On the other hand, if the receiver side does not have the continuous error retransmission function, the process proceeds to step S88.

In step S76, it is determined whether or not the international communication button is pressed, that is, whether or not the signal line 34a is at the signal level "1". Here, if the international communication button is pressed, that is, if the signal line 34a is at the signal level "1", the process proceeds to step S78. On the other hand, if the international communication button is not pressed, that is, the signal line 34
If a is the signal level "0", the process proceeds to step S80.

In step S78, it is determined whether or not the facsimile machine is the calling side, that is, whether or not the HASSIN flag is "1". As a result, if it is the calling side, that is, if the HASSIN flag is "1", step S80
Proceed to. On the other hand, when it is not the calling side, that is, when the HASSIN flag is "0", the process proceeds to step S88.

In step S80, transmission in the continuous error retransmission mode is selected. That is, signal lines 36d and 3
The signal levels "1" and "0" are output to 6e, respectively.

Step S82 represents a pre-procedure. Here, the image information transmission in the continuous error retransmission mode is declared by the NSS signal.

Step S84 represents image information transmission in the continuous error retransmission mode. When image information is transmitted using an international line, the tone generation circuit 16 generates an echo suppressor function stop tone immediately before the image signal is transmitted. Further, the NACK signal detection circuit 22 detects the NACK signal. The retransmission start line number transmitted after the NACK signal is detected by the retransmission start line detection circuit 24.
Next, when performing error retransmission, a signal indicating the retransmission start line number is output to the signal line 36c, and the encoding circuit 10 is notified of the retransmission start line number. Then, the encoding circuit 10 retransmits the image information from the retransmission start line number.

Step S86 represents a post procedure.

In step S88, image information transmission from low speed is selected. That is, the signal levels "0" and "1" are output to the signal lines 36d and 36e, respectively.

Step S90 represents a pre-procedure. Here, the image information transmission from the low speed is declared by the DCS signal.

Step S92 represents image information transmission at low speed.

Step S94 represents a post procedure.

In the embodiments described so far, when the error resending mode is selected when performing communication via an international line, image information transmission from the called side to the calling side is performed at a low speed. Control. However, in addition to such control, it is also possible to employ a method of performing half-duplex error retransmission (so-called stop-and-wait error retransmission method).

Further, in the embodiments described so far, it is determined whether or not the communication is the international communication by detecting the pressed state of the international communication button. However, it is also possible to configure so as to automatically identify whether or not it is international communication by receiving the initial identification signal NSF / CSI / DIS signal.

[Effect] As described above, according to the present invention, based on the instruction of the international communication by the operator and the judgment result of whether the calling side or not, the error resending is performed before the data communication is started or the low speed is transmitted. Since it is selected whether or not to start the data communication and the communication procedure is executed so that the communication is performed in the selected mode, the data transmission control can be performed without any trouble.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus to which the present invention is applied, and FIG. 2 is a flowchart showing the control procedure of the control circuit 36 shown in FIG. 2 ... NCU, 4 ... phone, 6 ... hybrid circuit, 8 ... reading circuit, 10 ... encoding circuit, 12 ... V27ter or V29 modulator, 14 ... V21 modulator, 16 ... echo suppressor Tone sending circuit for function stop, 18 …… Adding circuit, 20 …… V21 demodulator, 22 …… NACK signal detecting circuit, 24 …… Retransmission start line detecting circuit, 26 …… Selection signal sending circuit, 28 …… Selection signal Detection circuit, 30 ... Operation section, 32 ... Continuous error retransmission selection detection circuit, 34 ... International communication button press detection circuit, 36 ... Control circuit.

Claims (1)

[Claims] 1. A communication means capable of performing data communication in a first mode in which data communication is performed by error resending, a second mode in which data communication is started at a low speed, and an instruction means by which an operator manually instructs international communication. And a decision means for deciding whether or not the calling side, and whether to perform communication in the first mode before starting data communication based on the instruction by the instruction means and the decision result of the decision means. , Or a means for selecting whether to perform communication in the second mode and executing a communication procedure so that communication is performed in the selected mode.