JP3733740B2 - Communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention facilitates input / output of various data to / from a facsimile (hereinafter referred to as FAX) apparatus. For example, a modem (modem) for modulating / demodulating FAX data into an analog signal for transmission / reception via a telephone line, A communication apparatus or computer that converts image data such as bitmap data into FAX data and prints it using a FAX apparatus, or receives FAX data from the FAX apparatus and converts it into image data such as bitmap data for display. , Intelligent TV, etc.
[0002]
[Prior art]
In recent years, multimediaization of home appliances and computer equipment has been promoted, and devices that transmit and receive image data have come to be widely used.
[0003]
A conventional communication apparatus will be described below. 12 and 13 show the configuration of a conventional communication apparatus.
[0004]
An image memory 101 expands and records image data as bitmap data. Reference numeral 102 denotes a display circuit which reads out bitmap data on the image memory 101, converts it into a display RGB signal, and outputs it. Reference numeral 103 denotes a microcomputer, which reads out bitmap data and converts it into a FAX format. A FAX modem 104 receives FAX digital data converted by the microcomputer 103, modulates it into an analog signal for transmission to the telephone line, and transmits it to the telephone line via the NCU circuit 105. Reference numeral 106 denotes a FAX apparatus that is directly connected to a telephone line and is limited to transmission / reception via the telephone line.
[0005]
Next, the control operation of the NCU circuit 105 in FIG. 12 will be described with reference to FIG. Reference numeral 111 denotes a FAX modem which is controlled by the microcomputer 112.
[0006]
When the FAX modem 111 transmits FAX data to the telephone line, the microcomputer 112 confirms that the FAX apparatus 114 is not in the off-hook state by the off-hook detection circuit 115 connected to the FAX apparatus 114, and then switches the switching circuit 110 to the microcomputer 112. After switching to the FAX modem side under the control, the off-hook switch 113 connected to the FAX modem 111 is set to the off-hook state, and control is performed so that data is transmitted to the telephone line.
[0007]
When receiving FAX data from the telephone line, the ringing circuit 116 connected to the telephone line detects the transmitted calling signal, and when the FAX apparatus 114 is not in the off-hook state, the switching circuit 110 is controlled by the microcomputer 112. After switching to the FAX modem side, the FAX modem 111 off-hooks the off-hook switch 113 under the control of the microcomputer 112. At that time, a DC loop is generated in the telephone line by the current source 117 to enter an off-hook state. Thereafter, the FAX modem 111 receives FAX data.
[0008]
The FAX apparatus 114 is connected to the telephone line via the switching circuit 110, and transmission / reception of a calling signal to / from the telephone line is not performed until the switching circuit 110 is switched to the FAX apparatus 114 side under the control of the microcomputer. Can be sent and received. However, since the FAX modem 111 and the FAX apparatus 114 cannot be connected by the switching circuit 110, the FAX modem 111 and the FAX apparatus 114 cannot transmit and receive. Although not shown, even when the FAX apparatus 114 is directly connected to the FAX modem 111 without using a telephone line, the FAX modem 111 transmits and receives a call signal to the FAX apparatus 114 without passing through the line. Therefore, the FAX modem 111 and the FAX device 114 cannot automatically transmit / receive FAX data under the control of the microcomputer 112.
[0009]
In FIG. 13, the bridge circuit and the like necessary for the NCU circuit are not directly related to the description of the present invention and are omitted.
[0010]
[Problems to be solved by the invention]
As described above, such a configuration has the following problems.
[0011]
(1) Since the NCU circuit 118 cannot send a call signal to the FAX apparatus 114 that is directly connected to the FAX modem 111 without going through a telephone line, the FAX apparatus 114 receives the call signal and sends it to the NCU circuit 118. To control off-hook. As a result, there has been a problem that data cannot be transmitted to the FAX apparatus 114 that is directly connected without using a telephone line.
[0012]
(2) Since the NCU circuit 118 has no means for selecting either the telephone line 119 or the FAX apparatus 114 as the destination of transmission data, there is a problem that the user cannot select the destination of transmission data.
[0013]
(3) Since the FAX modem 111 cannot detect a call signal from the FAX apparatus 114 that is directly connected to the FAX modem 111 without going through a telephone line, the microcomputer 112 cannot perform control to off-hook the FAX apparatus 114. As a result, there has been a problem that data cannot be received from the FAX apparatus 114 that is directly connected without using a telephone line.
[0014]
(4) Since the NCU circuit does not have a function of selecting either the telephone line 119 or the FAX apparatus 114 as the transmission source of the received data, there has been a problem that the user cannot select the data transmission source.
[0015]
[Means for Solving the Problems]
  to this end,According to the present invention, a communication device connected to a public telephone line network is further configured to be directly connectable to a FAX apparatus without going through a telephone line, and a ring detection for detecting a call signal from the public telephone line network An off-hook detection circuit that detects an off-hook state of the FAX apparatus when the FAX modem directly connected to the communication apparatus and the FAX modem directly connected to the communication apparatus are not in a conductive state, and a directly connected FAX apparatus. A conduction circuit for conducting a tone signal to be emitted; a tone detection circuit for detecting the tone signal conducted by the conduction circuit; and detecting the ringing tone and detecting a non-off-hook state of the FAX device or detecting an off-hook state of the FAX device. And switching from a cut-off state to a conductive state in accordance with the detection of the tone, and switching to the public telephone line network. Receives fax data from the fax machine, receives fax data from the public telephone line network or the fax machine via the off-hook circuit, and demodulates the received analog signal into fax digital data. A FAX modem is provided.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings.
[0019]
FIG. 1 is a diagram showing a configuration of a communication apparatus according to the present invention. In FIG. 1, reference numeral 11 denotes an image memory which records input image data as bitmap data. Reference numeral 12 denotes a display circuit which reads bitmap data on the image memory 11 and converts it into display RGB signals for output. A microcomputer 13 reads the bitmap data on the image memory 11 and converts it into a fax format, or converts the input fax format data into bitmap data and writes it to the image memory 11. . Reference numeral 14 denotes a FAX modem which inputs FAX format digital data converted by the microcomputer 13, modulates it into an analog signal for transmission to the telephone line, and transmits it to the FAX apparatus 16 or telephone line via the NCU circuit 15. . The FAX modem 14 receives FAX data modulated into an analog signal from the FAX apparatus 16 or a telephone line, converts it into a digital data format of FAX format, and outputs it to the microcomputer 13.
[0020]
According to the present invention, the FAX modem and the FAX device 16 which are not possible in the conventional example are directly connected, that is, the FAX modem 14 and the FAX device 16 are directly connected without using a telephone line, and can transmit and receive each other. Yes. An example of the configuration of the NCU circuit will be shown below and its operation will be described.
[0021]
In FIG. 2, reference numeral 21 denotes a FAX modem, which is controlled by the microcomputer 22 to input FAX format digital data, modulate it into an analog signal, and output it. A call signal generation circuit 23 receives a call signal from the microcomputer 22 with a period of 1 second on and 2 seconds off at 16 Hz, converts it to an amplitude of about 200 V, and outputs it. Reference numeral 24 denotes a switching circuit, which switches whether the connection source of the FAX apparatus 28 is the FAX modem 21 or the call signal generation circuit 23 under the control of the microcomputer 22.
[0022]
Reference numeral 25 denotes a first off-hook detection circuit which is connected to the FAX apparatus 28 when the switching circuit 24 is switched to the calling signal generation circuit 23 side. Reference numeral 26 denotes a second off-hook detection circuit which is connected to the FAX apparatus 28 when the switching circuit 24 is switched to the FAX modem 21 side. A DC supply circuit 27 is a current source, and supplies a DC current to the FAX apparatus 28 via the switching circuit 24.
[0023]
A control operation of the microcomputer 22 and the like when the user transmits FAX data to the FAX apparatus 28 in the communication apparatus having such a configuration will be described with reference to FIGS. In FIG. 3, first, it is confirmed by the second off-hook detection circuit 26 or the first off-hook detection circuit 25 to be applied that the FAX apparatus 28 is not in the off-hook state (step 1), and the switching circuit 24 is moved to the calling signal generation circuit 23 side. Switch (step 2). Thereafter, the call signal generation circuit 23 sends a call signal to the FAX apparatus 28 (step 3). Thereafter, it is confirmed by the off-hook detection circuit 23 that adapts the FAX device 28 to be off-hook within a predetermined time (step 5), and the switching circuit 24 switches to the FAX modem 21 side (step 6). The FAX modem 21 controls to transmit the data from the image memory 11 shown in FIG. 1 as FAX format data (Step 10). By executing the operation as described above, it is possible to output the input image data from the FAX apparatus 28 that is directly connected without using a telephone line.
[0024]
Note that the second off-hook detection circuit 26 to be applied confirms that the FAX apparatus 28 is not in the off-hook state (step 7), when transmission of transmission data is completed (step 8), or when the user stops transmission. In such a case (step 9), the microcomputer 22 controls to stop transmission.
[0025]
In FIG. 2, the bridge circuit and the like necessary for the NCU 15 are omitted because they are not directly related to the description of the present invention.
[0026]
In the communication apparatus configured as described above, the NCU 15 has means for transmitting a call signal to the FAX apparatus 28 that is directly connected without using a telephone line, and the FAX apparatus 28 receives the call signal. The NCU 15 can be controlled off-hook.
[0027]
That is, the NCU circuit 15 has a call signal generation function for the FAX apparatus 28 that is directly connected without using a telephone line, so that a call signal can be transmitted. As a result, the FAX apparatus 28 can perform off-hook control, and the directly connected FAX apparatus 28 can automatically receive data. As a result, image data such as bitmap data can be easily transmitted directly to the FAX apparatus and printed.
[0028]
Further, the user can use the FAX apparatus as a simple printer more easily.
[0029]
(Embodiment 2)
Next, a second embodiment of the communication apparatus of the present invention will be described with reference to the drawings.
[0030]
In FIG. 4, 31 is a FAX modem, which is controlled by the microcomputer 32, inputs FAX digital data, modulates it into an analog signal, and outputs it. A call signal generation circuit 33 receives a call signal having a period of 1 second on and 2 seconds off at 16 Hz from the microcomputer 32, converts it into an amplitude of about 200V, and outputs it. Reference numeral 34 denotes a first switching circuit that switches whether the connection source of the FAX apparatus 38 is the FAX modem 31 or the call signal generation circuit 33 under the control of the microcomputer 32. Reference numeral 35 denotes a first off-hook detection circuit, which is connected to the FAX apparatus 38 when the first switching circuit 34 is switched to the calling signal generation circuit 33 side, and detects an off-hook state.
[0031]
Reference numeral 36 denotes a second off-hook detection circuit, which is connected to the FAX apparatus 38 when the first switching circuit 34 is switched to the FAX modem 31 side, and detects an off-hook state. Reference numeral 37 denotes a DC supply circuit, which is a current source, and supplies a DC current to the FAX apparatus 38 via a first switching circuit 34 and a second switching circuit 39 described later. Reference numeral 39 denotes a second switching circuit which switches whether the connection destination of the FAX modem 31 is a telephone line or a DC supply circuit 37 under the control of the microcomputer 32.
[0032]
When the FAX format data is transmitted from the FAX modem 31 to the FAX apparatus 38 and output from the FAX apparatus 38, the microcomputer 32 applies the second off-hook detection circuit 36 to be applied as in the control shown in the flowchart of FIG. Alternatively, the first off-hook detection circuit 35 confirms that the FAX apparatus 38 is not in the off-hook state (step 1), the first switching circuit 34 is switched to the call signal generation circuit 33 side, and the second switching circuit 39 is DC Switching to the supply circuit 37 side (step 2). Thereafter, the call signal generation circuit 33 sends a call signal to the FAX apparatus 38 (step 3). Then, it is confirmed by the off-hook detection circuit 35 that the FAX apparatus 38 has been off-hook within a predetermined time (step 5), and the first switching circuit 34 is switched to the FAX modem 31 side (step 6). At this time, a direct current is supplied from the DC supply circuit 37 to the FAX apparatus 38. Then, the FAX modem 31 controls to transmit the FAX data from the image memory 11 to the FAX apparatus 38 (Step 10).
[0033]
The off-hook detection means 36 or the off-hook detection circuit 35 to be adapted confirms that the FAX apparatus 38 is not in the off-hook state (step 7), when transmission of transmission data is completed (step 8), or when the user stops transmission. In such a case (step 9), the transmission is controlled to be stopped.
[0034]
Next, control when FAX format data is transmitted from the FAX modem 31 to the telephone line will be described with reference to the flowchart of FIG. 5 and FIG.
[0035]
The microcomputer 32 confirms that the FAX apparatus 38 is not in the off-hook state by the adaptive second off-hook detection circuit 36 (step 11), and switches the first switching circuit 34 to the calling signal generation circuit 33 side. At this time, the second switching circuit 39 is switched to the telephone line side (step 12).
[0036]
Next, the microcomputer 32 confirms that the telephone line is not off-hook using the second off-hook detection circuit 36 (step 13), and the FAX modem 31 sends a calling signal to the telephone line (step 14).
[0037]
Thereafter, it is confirmed that the telephone line has been off-hooked (timed out) within a predetermined time (step 15), and control is performed so that FAX data in FAX format is transmitted from the FAX modem 31 to the telephone line (step 19).
[0038]
When the FAX modem 31 confirms that the telephone line is not in an off-hook state (step 16), when transmission of the transmission data is completed (step 17), or when the user stops transmission (step 18), the FAX modem 31 performs transmission. Control to stop.
[0039]
When control is performed so that the FAX apparatus 38 transmits to the telephone line, the second off-hook detection circuit 36 or the first off-hook detection circuit 35 adapted to detect that the FAX apparatus 38 is in the off-hook state detects the first The first switching circuit 34 is switched to the FAX modem 31 side, and the second switching circuit 39 is switched to the telephone line side. Thereafter, the FAX apparatus 38 transmits FAX data to the telephone line.
[0040]
In FIG. 4, the bridge circuit and the like necessary for the NCU circuit 115 are omitted because they are not directly related to the description of the present invention.
[0041]
In the communication apparatus configured as described above, in addition to the effects of the configuration described in the first embodiment, the NCU circuit 115 selects the transmission destination of transmission data to be either a telephone line or a FAX apparatus under the control of the microcomputer. Therefore, the user can select the destination of the transmission data.
[0042]
As a result, it is possible to realize a communication device with a wide range of uses that allows a user to freely select a destination of data to be transmitted.
(Embodiment 3)
Next, a third embodiment of the present invention will be described with reference to the drawings.
[0043]
In FIG. 6, reference numeral 41 denotes a FAX modem, which is controlled by the microcomputer 42, receives FAX digital data, modulates it into an analog signal and outputs it, and demodulates the input modulated analog signal into FAX digital data. 43 is a call signal generation circuit, which inputs a call signal with a period of 1 second on and 2 seconds off at 16 Hz from the microcomputer 42, converts it into an amplitude of about 200V, and outputs it. Reference numeral 44 denotes a first switching circuit which switches the connection source of the FAX apparatus 48 to the FAX modem 41 or the call signal generation circuit 43 connected via the off-hook relay 401 under the control of the microcomputer 42. A first off-hook detection circuit 45 is connected to the FAX apparatus 48 and detects an off-hook state when the first switching circuit 44 is switched to the calling signal generation circuit 43 side. A second off-hook detection circuit 46 is connected to the FAX apparatus 48 and detects an off-hook state when the first switching circuit 44 is switched to the off-hook relay 401 side.
[0044]
Reference numeral 47 denotes a DC supply circuit, which is a current source, and supplies a DC current to the FAX apparatus 48 via a first switching circuit 44 and a second switching circuit 49 described later. Reference numeral 49 denotes a second switching circuit which switches the connection destination of the FAX modem 41 to the telephone line or the DC supply circuit 47 via the off-hook relay 401 under the control of the microcomputer 42. A ring detection circuit 40 is connected to the telephone line and determines whether or not a call signal has been transmitted from the telephone line, and outputs the result to the FAX modem 41. The FAX modem 41 outputs the result to the microcomputer 42.
[0045]
A capacitor 403 is connected to both ends of the off-hook relay and is AC coupled. Reference numeral 402 denotes a current source, which is off-hooked to the telephone line by passing a current between the FAX modem 41 side of the off-hook relay 401 and the grounding point of the telephone line.
[0046]
When the user transmits a signal in the FAX data format from the FAX modem 41 to the FAX apparatus 48, the second off-hook detection circuit 46 or the first off-hook detection circuit 45 to be adapted as in the control described in the flowchart of FIG. After confirming that the FAX apparatus 48 is not in the off-hook state (step 1), the microcomputer 42 switches the first switching circuit 44 to the calling signal generation circuit 43 side.
(Step 2). At this time, the second switching circuit 49 is controlled to be switched to the DC supply circuit 47 side.
[0047]
Next, the call signal generation circuit 43 sends a call signal to the FAX apparatus 48 (step 3). Then, after confirming that the FAX device 48 is off-hooked within a predetermined time by the first off-hook detection circuit 45 (step 5), the first switching circuit 44 is switched to the off-hook relay 401 side (step 6). . The off-hook relay 401 is maintained in a cut-off state.
[0048]
Next, the FAX modem 41 controls to transmit the image data in the image memory 11 as FAX data to the FAX apparatus 48 (Step 10).
[0049]
The applicable off-hook detection means 46 confirms that the FAX apparatus 48 is not in the off-hook state (step 7), completes transmission of transmission data (step 8), or terminates transmission by the user (step 8). Step 9) controls to stop transmission.
[0050]
The control by the microcomputer 42 when receiving the analog-modulated FAX data from the telephone line via the FAX modem 41 will be described with reference to the flowchart of FIG.
[0051]
The microcomputer 42 detects the ringing signal from the telephone line by the ring detection circuit 40 (step 21), and confirms the off-hook state of the FAX apparatus 48 by the second off-hook detection circuit 46 to be applied (step 22). When the second off-hook detection circuit 46 confirms that the FAX apparatus 48 is not in the off-hook state, the second switching circuit 49 is switched to the telephone line side (step 23). Then, the off-hook relay 401 is turned on to go off-hook to the telephone line (step 24). Thereafter, the microcomputer 42 controls the FAX modem 41 to receive analog-modulated FAX data from the telephone line (step 29).
[0052]
When the microcomputer 42 confirms that the telephone line is not in the off-hook state (step 26), when the received data is finished (step 27), or when the user stops receiving (step 28), the reception is stopped. To control.
[0053]
Also, when transmitting from the FAX modem 41 to the telephone line, and when the user transmits data from the FAX apparatus 48 to the telephone line, that is, when the data read by the FAX apparatus 48 is transmitted to the outside via the telephone line. This can be achieved by performing the same control as that described in the second embodiment.
[0054]
In FIG. 4, the bridge circuit and the like necessary for the NCU circuit 125 are omitted because they are not directly related to the description of the present invention.
[0055]
In the communication apparatus configured as described above, the FAX modem can also receive data from the telephone line in addition to the effects of the configuration described in the second embodiment.
[0056]
As a result, it is possible to realize a communication device with a wide range of uses that allows a user to freely select a source of data to be received.
[0057]
(Embodiment 4)
Next, a fourth embodiment of the communication apparatus of the present invention will be described with reference to the drawings.
[0058]
In FIG. 8, 51 is a FAX modem, which is controlled by the microcomputer 52, inputs FAX digital data, modulates and outputs the analog signal, and demodulates the input modulated analog signal to FAX digital data. . 53 is a call signal generation circuit, which receives a call signal with a period of 1 second on and 2 seconds off at 16 Hz from the microcomputer 52, converts it into an amplitude of about 200V, and outputs it. A first switching circuit 54 switches the connection source of the FAX apparatus 58 from the FAX modem 51 or the call signal generation circuit 53 connected via the off-hook relay 501 under the control of the microcomputer 52.
[0059]
A first off-hook detection circuit 55 is connected to the FAX apparatus 58 and detects an off-hook state when the first switching circuit 54 is switched to the calling signal generation circuit 53 side. A second off-hook detection circuit 56 is connected to the FAX apparatus 58 and detects an off-hook state when the first switching circuit 54 is switched to the off-hook relay 501 side. A DC supply circuit 57 is a current source, and supplies a DC current to the FAX apparatus 58 via a first switching circuit 54 and a second switching circuit 59 described later. Reference numeral 59 denotes a second switching circuit which switches whether the connection destination of the FAX modem 51 is a telephone line or a DC supply circuit 57 under the control of the microcomputer 52. A ring detection circuit 50 is connected to the telephone line and determines whether a call signal is transmitted from the telephone line and outputs the result.
[0060]
A capacitor 503 is connected to both ends of the off-hook relay and AC-coupled. Reference numeral 502 denotes a current source, which goes off-hook with respect to the telephone line by passing a current between the FAX modem 51 side of the off-hook relay 501 and the grounding point of the telephone line. A FAX calling tone detection circuit 504 is connected in the same manner as the FAX modem 51, detects a FAX calling tone, and outputs the result.
[0061]
Hereinafter, operation control of this configuration will be described. FIG. 9 is a flowchart illustrating an operation in a case where control is performed so that data read by the user into the FAX apparatus 58 is transmitted to the FAX modem 51 as FAX data.
[0062]
First, the microcomputer 52 detects the off-hook state of the FAX apparatus 58 using the second off-hook detection circuit 56 or the first off-hook detection circuit 55 that adapts (step 31). When it is detected that the FAX apparatus 58 is in an off-hook state, the first switching circuit 54 is switched to the off-hook relay 501 side, and the second switching circuit 59 is switched to the DC supply circuit 57 side, and the off-hook relay 501 is disconnected. The microcomputer 52 controls so as to maintain the above (step 32).
[0063]
Next, the FAX calling tone discrimination circuit 504 confirms that the FAX device 58 has sent a calling tone (step 33). If it is confirmed that the calling tone signal has been transmitted, control is performed so that the FAX modem 51 receives the analog-modulated FAX data transmitted by the FAX apparatus 58 (step 37).
[0064]
When data is transmitted from the FAX modem 51 to the FAX apparatus 58, the same control as that described in the third embodiment is performed. The microcomputer 52 stops the reception when it is confirmed that the FAX device 58 is not in the off-hook state (step 34), when the reception data is finished (step 35), or when the user stops the reception (step 36). Control to do.
[0065]
When transmitting from the FAX modem 41 to the telephone line, or when transmitting data read by the user by the FAX apparatus 48 to the telephone line, the same control as in the second embodiment is performed. In FIG. 5, the bridge circuit and the like necessary for the NCU circuit are not directly related to the description of the present invention and are omitted.
[0066]
The communication apparatus configured as described above has a function of detecting a calling tone signal from the FAX apparatus 58 that is directly connected without using a telephone line, in addition to the effect of the configuration described in the second embodiment. Based on the detection result, the FAX modem 51 causes the FAX device 58 to go off-hook, and data from the directly connected FAX device 58 can be received by the FAX modem 51. The NCU circuit 135 has a function of selecting either the telephone line or the FAX device 58 as the transmission source of the received data, and as a result, the user can freely select the transmission source of the received data. Realize communication equipment
In other words, it has a function of detecting a calling tone signal from a FAX apparatus directly connected without a telephone line or a function of detecting a calling signal, and the microcomputer off-hooks according to the detection result and starts a receiving operation. Data can be automatically received from a directly connected FAX machine. As a result, information that can be transmitted by the FAX apparatus can be received from a directly connected FAX apparatus and captured as image data such as bitmap data. The user can use the FAX machine as a scanner more easily.
[0067]
(Embodiment 5)
Next, a fifth embodiment of the communication apparatus of the present invention will be described with reference to the drawings.
[0068]
In FIG. 10, reference numeral 71 denotes a FAX modem which is controlled by the microcomputer 72 and demodulates an input modulated analog signal into FAX digital data. An off-hook detection circuit 73 is connected to the FAX apparatus 75. A DC supply circuit 74 is a current source, and supplies a DC current to the FAX apparatus 75. Reference numeral 76 denotes a switching circuit which switches the connection destination of the FAX modem 71 to the telephone line or the DC supply circuit 74 via the off-hook relay 77 under the control of the microcomputer 72.
[0069]
Reference numeral 78 denotes a ring detection circuit, which is connected to a telephone line, determines whether a call signal is transmitted from this telephone line, and outputs the result to the FAX modem 71. A capacitor 79 is connected to both ends of the off-hook relay and is AC coupled. Reference numeral 80 denotes a current source, which goes off-hook with respect to the telephone line by passing a current between the FAX modem 71 side of the off-hook relay 77 and the grounding point of the telephone line. A FAX calling tone detection circuit 81 is connected in the same manner as the FAX modem 71, detects a FAX calling tone from the FAX apparatus 75, and outputs the result to the microcomputer 72.
[0070]
The control when FAX data is transmitted from the FAX apparatus 75 will be described. First, the off-hook detection circuit 73 detects the off-hook state of the FAX apparatus 75. When the off-hook detection circuit 73 detects that the FAX apparatus 75 is in the off-hook state, the switching circuit 76 is switched to the DC supply circuit 74 side. At this time, the off-hook relay 77 is kept off.
[0071]
Next, when the FAX calling tone detection circuit 81 confirms that the FAX device 75 has transmitted a calling tone, the FAX modem 71 controls the FAX modem 71 to receive the analog-modulated FAX data transmitted.
[0072]
On the other hand, when analog-modulated FAX data is transmitted from the telephone line, the ring detection circuit 78 detects a call signal from the telephone line, switches the switching circuit 76 to the telephone line side, and turns off the off-hook relay 77. After being off-hooked to the telephone line, the FAX modem 71 is controlled to receive the analog-modulated FAX data from the telephone line.
[0073]
In FIG. 10, the bridge circuit and the like necessary for the NCU circuit 145 are omitted because they are not directly related to the description of the present invention.
[0074]
In the communication apparatus configured as described above, in addition to the effects of the embodiment, the NCU circuit has a function of selecting either a telephone line or a FAX apparatus as a transmission source of received data, and data received by the user You can select the source of
[0075]
In the communication apparatus described in the fourth and fifth embodiments, a FAX apparatus that discriminates a calling signal output from the FAX apparatus instead of a calling tone detection circuit that determines a calling tone output from the FAX apparatus. When the user transmits fax data from the fax machine to the fax modem, the microcomputer confirms that the fax machine has sent the call signal by the fax machine call signal discrimination means, and then the fax machine. It is also possible to control to receive analog-modulated FAX data transmitted by.
[0076]
(Embodiment 6)
Next, a sixth embodiment of the communication apparatus according to the present invention will be described with reference to FIG.
[0077]
FIG. 11 shows an embodiment of the configuration of the communication apparatus according to the present invention. In FIG. 11, reference numeral 82 denotes a FAX modem, which has an effect of modulating / demodulating digital data into an analog signal for transmission over a public telephone line. In recent years, the main circuit has a configuration integrated in an IC. 94 is a general public telephone line connected to the modem, and exchanges data with the FAX modem 82. Reference numeral 83 denotes an insulating transformer, which is the same as the component described as “transformer” described in FIG. 4 and the like but not provided with a reference numeral, and is a voltage level on the FAX modem 82 side and a voltage on the telephone line 94 side. Has the effect of transforming the difference from the level.
[0078]
The resistor 85 has a function of adjusting the signal level, and the capacitor 86 has a function of blocking the DC signal. The first relay 93 has an effect of selecting whether a telephone line 95 or a DC power supply 95 (corresponding to a DC supply circuit in FIG. 4) is connected to a terminal 92 such as a facsimile machine with a telephone or a FAX modem 82. The second relay 88 has a function of controlling the connection between the FAX modem 82 and the telephone line 94, and the third relay 84 is a diode bridge 87 provided for forming a DC loop (not shown in FIG. 4 and the like). And the fourth relay 91 has a ring signal generated by a ring signal generation circuit 89 (corresponding to a call signal generation circuit in FIG. 4 and the like) with a telephone. It has the effect of controlling whether or not to transmit to a terminal 92 such as a facsimile machine.
[0079]
The ring signal generation circuit 89 has a function of generating a signal similar to the ring signal transmitted through a normal public telephone line, and the generated ring signal is transmitted to the telephone. That is, a ring signal can be transmitted from the FAX modem 82 to a terminal 92 such as a facsimile machine with a telephone, that is, a call can be made.
[0080]
Next, the operation of the embodiment thus configured will be described. First, when transmission is performed between the telephone line 94 and the FAX modem 82, the first relay 93 is off (the upper side in FIG. 11, the upper side is turned off and the lower side is turned on in all the relays below), The second relay 88 is turned on, the third relay 84 is turned off, and the fourth relay 91 is turned off. In this state, a DC loop is formed in the line, and the FAX modem 82 is connected to the telephone line 94 via the insulation transformer 83, and normal transmission is performed.
[0081]
Next, when transmission is performed between the terminal 92 such as a facsimile machine with a telephone and the FAX modem 82 in the conventional configuration, the first relay 93 is turned on, the second relay 88 is turned off, and the third relay is turned on. 84 is off, and the fourth relay 91 is off. In this state, since no DC voltage is applied to the diode bridge 87, the diode is off, and the level of the signal between the terminal 92 such as a facsimile machine with a telephone and the FAX modem 82 decreases. Reliable communication becomes difficult. Therefore, the second relay 88 may be turned on to make the diode bridge 87 conductive. In this case, the DC power supply 95 supplies current to both the terminal 92 such as a facsimile apparatus with a telephone and the DC circuit 90. Supply is required, and the configuration of the power source is also large and expensive. Therefore, in this embodiment, the third relay 84 is provided, and the diode bridge 87 and the DC circuit 90 are bypassed by turning on the third relay 84, and communication is possible between the terminal 92 such as a facsimile apparatus with a telephone and the FAX modem 82. It is what.
[0082]
Further, according to the present embodiment, when a terminal 92 such as a facsimile machine with a telephone communicates with another terminal via a telephone line 94, when the line signal needs to be monitored, the second is performed as described above. The relay 88 is turned off and the third relay 84 is turned on, so that even if the second relay 88 is turned off, the state of the other party is facsimileed AC via the series circuit of the resistor 85 and the capacitor 86. The CNG signal and the DTMF signal of the telephone can be monitored. Further, since the diode bridge 87 and the DC circuit 90 are bypassed, the line signal can be monitored without a voltage drop due to the diode.
[0083]
As described above, according to the present embodiment, the above-described configuration is advantageous in that it is possible to monitor a telephone line and a telephone with a simple circuit configuration without the need to add a monitor device to the outside as in the prior art. Effects can be obtained. Further, as in the other embodiments, the communication apparatus can be directly connected to the FAX modem without being connected to the telephone line connection terminal, and the FAX apparatus can be connected to the telephone line terminal. Data can be sent and received. In other words, by using four relays, even if the off-hook relay is in the off state, the other party's state is changed to AC via the resistor / capacitor series circuit via the resistor / capacitor series circuit. Can be monitored. As a result, it is possible to obtain an advantageous effect that a telephone line or a telephone can be monitored with a simple circuit configuration without using a monitor display.
[0084]
【The invention's effect】
As described above, the communication apparatus of the present inventionSince data can be output to a directly connected FAX apparatus without using a telephone line, data can be easily printed using the FAX apparatus.
In addition, since a calling tone from a directly connected FAX apparatus can be detected without going through a communication line, data read using the FAX apparatus can be easily captured.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of a communication apparatus according to the present invention.
FIG. 2 is a block diagram showing a configuration of an NCU circuit in the first embodiment of the present invention.
FIG. 3 is a flowchart of the control operation of the NCU circuit.
FIG. 4 is a block diagram showing a configuration of an NCU circuit in a second embodiment of the present invention.
FIG. 5 is a flowchart of the control operation of the NCU circuit.
FIG. 6 is a block diagram showing a configuration of an NCU circuit according to a third embodiment of the present invention.
FIG. 7 is a flowchart of the control operation of the NCU circuit.
FIG. 8 is a block diagram showing a configuration of an NCU circuit according to a fourth embodiment of the present invention.
FIG. 9 is a flowchart of the control operation of the NCU circuit.
FIG. 10 is a block diagram showing a configuration of an NCU circuit according to a fifth embodiment of the present invention.
FIG. 11 is a block diagram showing a configuration of an NCU circuit according to a sixth embodiment of the present invention.
FIG. 12 is a block diagram showing the configuration of a conventional communication apparatus.
FIG. 13 is a block diagram showing a configuration of an NCU circuit of a conventional communication apparatus.
[Explanation of symbols]
23, 33, 43, 53, 89 Call signal generation circuit
25, 26, 35, 36, 45, 46, 55, 56, 73 Off-hook detection circuit
27, 37, 47, 57, 74, 90 DC supply circuit
24, 34, 39, 44, 49, 54, 59, 76, 84, 91, 93 switching circuit
40, 50, 74 Ring detection circuit
81 FAX calling tone detection circuit

Claims (1)

The communication device connected to the public telephone line network is further configured to be directly connectable to the FAX apparatus without going through the telephone line, and communicates with a ring detection circuit for detecting a call signal from the public telephone line network, An off-hook detection circuit for detecting an off-hook state of the FAX apparatus when the FAX modem directly connected to the communication apparatus and the FAX apparatus directly connected to the communication apparatus are not in a conductive state, and a tone signal generated by the directly connected FAX apparatus. A conduction circuit for conducting; a tone detection circuit for detecting the tone signal conducted by the conduction circuit; and detecting the ringing tone and detecting a non-off-hook state of the FAX device or detecting an off-hook state of the FAX device and detecting the tone. A switch is made from a cut-off state to a conductive state upon detection, and the public telephone network or F An off-hook circuit that receives FAX data from the X apparatus, and a FAX that receives the FAX data from the public telephone line network or the FAX apparatus via the off-hook circuit and demodulates the received analog signal into FAX digital data. A communication apparatus comprising a modem.

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