JP3542421B2 - Data communication device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a data communication apparatus corresponding to the dial-in service.
[0002]
[Prior art]
In recent years, a so-called dial-in service has been provided in which a DTMF signal is transmitted from a central office at the time of an incoming call, and one of a plurality of terminals (for example, a telephone and a facsimile machine or a data terminal) connected to a line is specified as an incoming terminal. ing. This dial-in service requires the use of a device corresponding to a private branch exchange, but is a service that can be easily used when a user has a plurality of devices and wants to use a direct number for each of them.
[0003]
To receive dial-in service using existing telephones, facsimile machines, data terminals, etc., use a device equivalent to a private branch exchange that analyzes the DTMF signal from the exchange and selects the terminal connected to the line. A facsimile apparatus to which an external telephone can be connected has been considered which is compatible with such a dial-in service.
[0004]
[Problems to be solved by the invention]
Conventional facsimile machines compatible with dial-in service are provided with a reciprocity detection circuit for detecting the polarity reversal of the dial-in service, and an external telephone using the dial-in service without ringing the external telephone with a ringing signal upon receiving a call. In addition to controlling direct incoming calls to multiple terminals, including the automatic answering by voice message and the ability to receive calls to an external telephone, the external telephone is set to the off-hook detection voltage instead of the line side during standby. The state of the telephone hook is monitored by an off-hook detection circuit for detecting the off-hook of the external telephone and an off-hook detection voltage supply means for supplying the off-hook detection voltage to the line. What has been proposed.
[0005]
However, in the above-described conventional configuration, since the off-hook detection voltage is supplied even during standby, there is a problem that the power consumption of the device during standby is large.
[0006]
Further, in the conventional facsimile apparatus compatible with the dial-in service, when a telephone number of the dial-in service is registered in the device, a DTMF signal indicating the telephone number corresponding to the facsimile is transmitted from the exchange when calling a facsimile, and In the case of a call to an external telephone, it is expected that a DTMF signal indicating a telephone number corresponding to the telephone will be transmitted from the exchange, and in a state where service is not available from a line carrier, the external telephone and a facsimile are used. In some cases, incoming calls cannot be switched properly between the communication mechanisms. Since it is not always possible to immediately receive service from a line carrier immediately after applying for a dial-in service, it is necessary to consider when to register a direct number in such a configuration, and the handling of the user is troublesome. There is a problem.
[0007]
Therefore, an object of the present invention is to operate with low power consumption and to communicate with an external telephone such as a facsimile even when a telephone number of a dial-in service is registered and a service is not yet available from a line carrier. suitable incoming switching between the mechanisms is to provide a capable data communication device.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a polarity detecting means for detecting polarity reversal of a line, an off-hook detecting means for detecting a hook state of an external telephone, and a calling signal detecting means for detecting a calling signal from a line. When a DC voltage for off-hook detection, and supply means for supplying a pseudo call signal to the external telephone, the external telephone and off-hook detecting means the line side or a first switching to one of said supply means side A switching unit, a data communication unit having a function of detecting a DTMF signal designating a called terminal transmitted from a line, and connecting the line to the external telephone , the off-hook detection unit and the call signal detection unit, or the data communication unit. and a second switching means for switching to either side, and the external telephone line by said second switching means, Ofufu Connect to click detection means and said call signal detecting means side, and said first of said external telephone line by controlling so as to connect the external telephone and off-hook detection means to the line side by switching means, an off-hook Connected to the detection means and the call signal detection means, and controlled to turn off the output of the supply means. When the line is connected to the external telephone , the off-hook detection means and the call signal detection means, the polarity detection means When the polarity inversion of the line is detected by the addition to connecting the external telephone and off-hook detecting means to said supplying means side by the first switching means, said off-hook detecting means to turn on the output of said supply means to supply the off-hook detection voltage, thereafter, a call from the line by the ringing signal detecting means When a signal is detected, the line is switched to the data communication means by the second switching means. When a DTMF signal is detected by the data communication means, the supply means is switched in accordance with the detected DTMF signal. , A control to supply a pseudo call signal to the external telephone is adopted.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a block diagram showing the overall configuration of a facsimile apparatus embodying the present invention.
[0012]
In FIG. 1, the NCU 1 switches the line connection between the external telephone 2 and the facsimile main body, and details will be described later with reference to FIG.
[0013]
The tone detector 3 detects a tone such as CNG (1100 Hz) or BT (400 Hz), and the DTMF detector 4 transmits a DTMF signal for a dial-in service (or another service) transmitted from the exchange. Is to be detected. The modem 5 modulates and demodulates an image signal to be transmitted / received, and the voice transmitting unit 6 transmits a voice message.
[0014]
The control unit 7 controls the entire facsimile apparatus, and includes a CPU 8 serving as a control center, a RAM 9 used to accumulate images, store various flags and tables, use a work area of the CPU 8, It includes a ROM 10 in which a program is written, a timer 11 for various timings, and the like.
[0015]
The reading unit 12 reads an image on a document, and includes a light source for document illumination, a document transport system, and the like. The recording unit 13 records a received image or the like on a recording sheet, and is configured by a recording mechanism of a thermal type or an electrophotographic type. The operation unit 14 includes an LCD display unit for performing various displays, a keyboard for inputting various keys, and the like. The power supply unit 15 supplies power to the entire facsimile machine.
[0016]
FIG. 2 is a block diagram illustrating a configuration of the NCU 1 according to the present embodiment.
[0017]
In FIG. 2, a line pair 21 is a line pair connected to a telephone line, and a line pair 22 is a line pair connected to the external telephone 2. The polarity inversion detection circuit 23 is a circuit for detecting the polarity of a line, and outputs 40-a and 40-b are outputs thereof. This polarity inversion detection circuit 23 detects the polarity when the line is opened. When the line L1 is + and the line L2 is-, the output 40-a is "L" and the output 40-b is "H". When the line L1 is-and the line L2 is +, the output 40-a is "H" and the output 40-b is "L". However, when the line is closed by the facsimile or the external telephone 2, the outputs 40-a and 40-b are both set to "L".
[0018]
In the present embodiment, the control unit 7 monitors the ports 40-a and 40-b of the polarity inversion detection circuit 23 at a certain cycle. Then, when the power is turned on, the output values of 40-a and 40-b are stored in the RAM 9, and this polarity is set to a normal polarity (K), and polarity inversion and reversion are detected. However, if both 40-a and 40-b are "L" when the power is turned on, it means that the line is not connected to the line pair 21 of the NCU 1, so that when either output becomes "H". The polarity is normal polarity (K).
[0019]
The CML relay 24 is a relay for selectively switching the line to the external telephone 2 side or the facsimile main body side, and the DC capture circuit 25 is a circuit for satisfying the DC resistance value of the facsimile main body when capturing the line. is there. The transformer 26 is a transformer for separating the line from the modem side in a DC manner, and the signal lines 38 and 39 are lines for transmitting a transmission / reception signal to the modem 5 in FIG.
[0020]
The off-hook detection circuit 30 is a circuit that detects an off-hook of the external telephone 2, and outputs an off-hook detection signal to the control unit 7 via a signal line 33. For the operation of the off-hook detection circuit 30, it is necessary to turn on the H relay 31 and supply a DC for off-hook detection from the pseudo CI and DC voltage generation circuit 32.
[0021]
The pseudo CI and DC voltage generation circuit 32 is used to input a pseudo CI (call signal) to the telephone connected to the line pair 22 to make it ring, and to detect the off-hook detection circuit 30 provided in the line pair 22. It is also used for the function of supplying necessary DC.
[0022]
That is, the pseudo CI and DC voltage generation circuit 32 generates a pseudo CI signal that oscillates at about +24 V to −150 V according to the signal on the signal line 34 sent from the control unit 7, and makes the external telephone 2 ring. That is, the pseudo CI and DC voltage generation circuit 32 pseudoly forms a state when a normal telephone receives a CI (call) signal.
[0023]
Further, the pseudo CI and DC voltage generation circuit 32 is configured to supply about 24 V when the pseudo CI is not generated. The circuit 32 is configured to be able to select whether or not to generate the DC voltage according to a signal on the signal line 35 sent from the control unit 7.
[0024]
The H relay 31 is a relay for selectively switching the connection of the external telephone set 2 to the line side or the pseudo CI and DC voltage generation circuit 32 side.
[0025]
The CI detection circuit 29 is a circuit that detects a CI (call signal) from a line, and outputs the CI detection signal to the control unit 7 from a signal line 36.
[0026]
The audio transformer 27 is a transformer for separating the line from the tone detection circuit 28 and has an input impedance of about 20 KΩ. The tone detection circuit 28 is for detecting FC (1300 Hz), and outputs an FC detection signal to the control unit 7 via a signal line 37.
[0027]
FIG. 7 is a flowchart showing the operation of the apparatus shown in FIG. The illustrated procedure is controlled by the CPU 8 of the control unit 7, and is stored in the ROM 10 as a program of the CPU 8. It is assumed that the parts of the same alphabet in FIG. 7 are connected there.
[0028]
In the present embodiment, a mode in which the operation is performed in accordance with the dial-in service and a conventional operation mode can be selected by key input of the operation unit 14. At the start of the flowchart in FIG. It is assumed that the service support mode has been selected.
[0029]
In this dial-in service mode, it is assumed that the telephone number "0001" is registered for facsimile and the telephone number "0002" is registered for telephone. These direct numbers are registered in the RAM 9 of FIG. 1 or an EEPROM (not shown). These direct numbers are transmitted from the exchange at the time of an incoming call.
[0030]
At this time, in the standby state, CML relay 24 is off (external telephone 2 side), H relay 31 is off (line side), pseudo CI and DC voltage generating circuit 32 are off (both pseudo CI and DC voltage are generated). Not).
[0031]
First, it is monitored in the standby state whether there is polarity reversal from the line (step S1). If there is no polarity reversal, the output 33 of the off-hook detection circuit 30 checks whether the external telephone 2 is off-hook. (Step S2). Then, when the off-hook is detected, the process at the time of talking on the external telephone 2 is performed (step S4). If no off-hook is detected, the process waits for 100 ms (step S3) and returns to the standby state. Note that the wait time in (Step S3) can be changed as long as there is no problem in monitoring the state.
[0032]
In the above (Step S1), when the polarity inversion is detected by the output (40-a, 40-b) of the polarity inversion detection circuit 23 (K), the remote signal 35 is turned on, and the pseudo CI and DC voltage generation circuit 32 is turned on. , And turns on the H relay (pseudo CI and DC voltage generation circuit 32 side) (step S5).
[0033]
Next, the timer 1 is started (step S6), and it is checked whether or not a CI (call signal) has arrived from the line based on the output 36 of the CI detection circuit 29 (step S7). Here, the time T1 of the timer 1 is set to 5 seconds, but can be changed.
[0034]
If no CI is detected, it is checked whether or not the set time of the timer 1 has passed (step S8). If the time counted by the timer 1 has not elapsed, the CI is checked again (step S7). If it has passed, the H relay is turned off (line side), the remote signal 35 is turned off, and the DC voltage from the pseudo CI and DC voltage generation circuit 32 is stopped (step S30). Thereafter, the polarity is stored (step S31), and the process returns to the standby state.
[0035]
In the above (Step S7), if CI is detected, the CML relay 24 is turned on (FAX side) (Step S9).
[0036]
Next, the timer 2 is started (step S10), and a DTMF signal sent from the exchange is detected (step S11). This DTMF signal is a four-digit telephone number for which a dial-in service contract has been made. Here, the time T2 of the timer 2 is set to 3 seconds, but can be changed.
[0037]
If a DTMF signal cannot be detected in the above (step S11), a CNG signal is detected (step S16). If CNG cannot be detected, it is checked whether the set time of the timer 2 has passed (step S17). If the time measured by the timer 2 has not elapsed, the DTMF signal is checked again. If the time measured by the timer 2 has elapsed or CNG has been detected, processing for switching to facsimile is performed as in the conventional case (step S18).
[0038]
If a DTMF signal is detected in step S11, the polarity (K) at that time is stored (step S12), and the CML relay 24 is turned off (external telephone 2 side) (step S13). Then, the detected DTMF signal is compared with the registered telephone number (step S14). If the detected DTMF signal is a telephone number for dial-in service facsimile ("0001" in the present embodiment), the facsimile is performed. A communication process is performed (step S15).
[0039]
If the detected DTMF signal is a dial-in service telephone number ("0002" in this embodiment), it is checked whether or not the external telephone 2 is off-hook (step S19). Then, if on-hook, the pseudo CI is transmitted (step S20).
[0040]
Next, the timer 3 is started (step S21), and polarity reversal is detected (step S22). When the other party abandons the communication in the middle, the line is reset (K). The time T3 of the timer 3 is set to 60 seconds, but can be changed.
[0041]
When this reversion is detected, the pseudo CI is stopped (step S23), the H relay is turned off (line side), the remote signal 35 is turned off, and the pseudo CI and the DC voltage from the DC voltage generation circuit 32 are turned off. The voltage is stopped (step S30). Thereafter, the polarity is stored (step S31), and the process returns to the standby state.
[0042]
If the return is not detected, it is checked whether or not the external telephone 2 is off-hook (step S24). If it is on-hook, it is checked whether the set time of the timer 3 has passed (step S32). If it has not passed, the polarity inversion is checked again (step S22).
[0043]
In the above (Step S32), when the set time of the timer 3 has passed, the transmission of the pseudo CI is stopped (Step S33), the H relay is turned off (line side), and the remote signal 35 is turned off. The DC voltage from the pseudo CI and DC voltage generation circuit 32 is stopped (step S34). Then, the CML relay 24 is turned on (FAX side), and a message "I am out of the office, please call again later" is sent from the voice sending section 6 (step S36), and the CML relay 24 is turned off (external connection). (Step S37). Thereafter, the polarity is stored (step S31), and the process returns to the standby state.
[0044]
In the above (Step S24), when an off-hook is detected, the transmission of the pseudo CI is stopped (Step S25), the H relay is turned off (line side), the remote signal 35 is turned off, and the pseudo CI and The DC voltage from the DC voltage generation circuit 32 is stopped (Step S26). During a call on the external telephone 2 (step S27), off-hook detection is performed (step S28). If the call is on-hook, it is determined that the call has ended (step S29), and the polarity is stored (step S29). S31), returning to the standby state.
[0045]
Next, the operation of the relay, the polarity of the line, the pseudo CI, and the change in the transmission voltage from the DC voltage generation circuit 32 in the dial-in service will be described with reference to the time charts of FIGS.
[0046]
FIG. 3 shows a case of an incoming call to the telephone number "0001" (facsimile) (corresponding to steps S1 to S7 to S11 to S14 to S15 in FIG. 7).
[0047]
In FIG. 3, 101-a indicates a change in line polarity, 102-a indicates the operation of a CML relay, 103-a indicates the operation of an H relay, and 104-a indicates the pseudo CI and DC voltage generation circuit 32. Represents the change in the voltage of
[0048]
Further, t1 is a timing at which the polarity is inverted, and t2 is a timing at which the remote signal 35 and the H relay are turned on. Further, after the polarity is inverted, the CI arrives and the output 36 of the CI detection circuit 29 is turned on. Therefore, the control unit 7 checks whether the incoming signal is the CI. Then, at time t3, if the CI is determined, the CML relay 24 is turned on to capture the line (primary response).
[0049]
Thereafter, the lower four digits of the telephone number are sent as a DTMF signal from the exchange, and the DTMF detector 4 detects this. The detection is completed between time t3 and time T1 (500 ms in the present embodiment), and at time t4, the CML relay 24 is turned off to break the DC loop. Note that T1 needs to be within about 2.1 seconds.
[0050]
Subsequently, the detected DTMF signal is compared with the registered telephone number for a time T2 (500 ms in this embodiment). In this case, since "0001" has been received and the telephone number is a registered facsimile telephone number, the CML relay 24 is turned on again at time t5 to start facsimile reception. Note that when the line is captured at t5, the polarity of the line is reversed (secondary response).
[0051]
Next, FIG. 4 shows a case of an incoming call to the telephone number "0002" (telephone) (corresponding to steps S1 to S7 to S11 to S14 to S19 to S23 to S24 to S25 in FIG. 7).
[0052]
In FIG. 4, 101-b indicates a change in line polarity, 102-b indicates an operation of a CML relay, 103-b indicates an operation of an H relay, and 104-b indicates a pseudo CI and DC voltage generation circuit 32. Represents the change in the voltage of Further, t1, t2, t3, and t4 are the same timings as described above.
[0053]
Subsequently, the detected DTMF signal is compared with the registered telephone number for a time T2 (500 ms in this embodiment). In this case, since it is "0002", which is a registered telephone number, at time t5, the pseudo CI and the DC voltage generation circuit 32 generate a pseudo CI to cause the external telephone 2 to ring. When the external telephone 2 is hooked off at time t6, the H relay is turned off. At that point, a DC loop is formed again, so that the polarity of the line is reversed (secondary response). Further, the pseudo CI is stopped, the remote signal 35 is turned off, and the DC voltage is also turned off.
[0054]
FIG. 5 shows the case where the telephone number “0002” of the dial-in service is transmitted as in FIG. 4, but shows the case where the caller hangs up without anybody answering the call (FIG. 7). Steps S1 to S7 to S11 to S14 to S19 to S22 to S23).
[0055]
In FIG. 5, 101-c indicates a change in line polarity, 102-c indicates the operation of the CML relay, 103-c indicates the operation of the H relay, and 104-c indicates the pseudo-CI and DC voltage generation circuit 32. Represents the change in the voltage of Also, t1, t2, t3, t4, and t5 are the same timings as in FIG.
[0056]
In FIG. 5, the calling side hangs up the telephone at time t6 to release the line, so that the polarity of the line is reversed. On the facsimile side of this embodiment, the polarity reversal detection circuit 23 detects that the polarity has been reversed at time t6, stops the pseudo CI, turns off the remote signal 35, and turns off the DC voltage. .
[0057]
FIG. 6 also shows a case where the dial-in service number "0002" is transmitted as in FIG. 4, but shows a case where no one answers the telephone for a certain period of time (steps S1 to S7 to FIG. 7). S11 to S14 to S19 to S23 to S24 to S32 to S33).
[0058]
6, 101-d indicates a change in the polarity of the line, 102-d indicates the operation of the CML relay, 103-d indicates the operation of the H relay, and 104-d indicates the pseudo-CI and DC voltage generation circuit 32. , And 105 indicates voice transmission. Further, t1, t2, t3, t4, and t5 are the same timings as described above.
[0059]
At time t6, if a predetermined time (T3) or more has elapsed from t5 (timer 3 expires), pseudo CI is stopped, the remote signal 35 is turned off, and the DC voltage is turned off. Also, the H relay is turned off. Next, at time t7, the CML relay is turned off. At that point, a DC loop is formed again, so that the polarity of the line is reversed (secondary response). Then, a message is transmitted from the voice transmitting unit 6. Then, at time t8, the transmission of the message ends, and the line is released.
[0060]
According to the above embodiment, when a dial-in service contract is made, an external telephone is connected to the line side when the device is on standby, the output of the off-hook detection voltage supply means is turned off, and polarity reversal is detected. By turning on the pseudo-CI and the output of the DC voltage generating circuit 32 when supplied, supplying the off-hook detection voltage and switching the external telephone to the off-hook detection voltage supply side, the off-hook detection voltage can be supplied only when necessary, It is possible to realize non-ringing reception at the time of dial-in service reception, and reduce power consumption of the device at the time of standby.
[0061]
Also, when the telephone number of the dial-in service is registered, even if the service is not yet available, if a call is received by a normal method (to the telephone number previously used), the same facsimile / The telephone can be switched, and the facsimile and telephone can be switched smoothly.
[0062]
In the above description, the facsimile apparatus to which an external telephone can be connected has been described as an example. However, a part of the facsimile apparatus may be a data processing apparatus such as a computer system. It is needless to say that the present invention is not limited to the embodiment.
[0063]
【The invention's effect】
As apparent from the above description, according to the present invention, a DC voltage for off-hook detection, the output of the supply means for supplying a pseudo call signal to the external telephone to be able to turn on when needed to call control Therefore, it is possible to provide an economical data communication device that requires less power consumption during standby .
[Brief description of the drawings]
FIG. 1 is a block diagram showing an overall configuration of a facsimile apparatus employing the present invention.
FIG. 2 is a block diagram showing a configuration of an NCU part in FIG.
FIG. 3 is a time chart illustrating an operation when a call is received by facsimile in the configuration of FIG. 1;
FIG. 4 is a time chart showing an operation when a call is received by receiving a call from an external telephone in the configuration of FIG. 1;
FIG. 5 is a time chart showing an operation when a call is received by an external telephone and the calling side hangs up in the configuration of FIG. 1;
FIG. 6 is a time chart showing an operation in the case of receiving a call to an external telephone and transmitting a voice message without a response for a fixed time in the configuration of FIG. 1;
FIG. 7 is a flowchart illustrating incoming call control in the configuration of FIG. 1;
[Explanation of symbols]
1 NCU
2 External telephone 3 Tone detector 4 DTMF detector 5 Modem 6 Voice transmitter 7 Controller 8 CPU
9 RAM
10 ROM
DESCRIPTION OF SYMBOLS 11 Timer 12 Reading part 13 Recording part 14 Operation part 15 Power supply part 21 Line pair 22 Line pair 23 Polarity inversion detection circuit 24 CML relay 25 DC capture circuit 26 Transformer 27 Audio transformer 28 Tone detection circuit 29 CI detection circuit 30 Off-hook detection circuit 31 H relay 32 Pseudo CI and DC voltage generation circuit 32 DC voltage generation circuit

Claims (1)

Polarity detection means for detecting the polarity reversal of the line,
Off-hook detection means for detecting a hook state of the external telephone;
Paging signal detection means for detecting a paging signal from the line,
DC voltage for off-hook detection, supply means for supplying a pseudo-call signal to the external telephone ,
First switching means for switching the external telephone and the off-hook detection means to either the line side or the supply means side;
Data communication means having a function of detecting a DTMF signal specifying a called terminal transmitted from the line;
The external telephone line, or off-hook detecting means and said call signal detecting means side, a second switching means for switching to one of said data communication means side,
Has,
The second switching means connects a line to the external telephone , the off-hook detecting means and the call signal detecting means , and the first switching means connects the external telephone and the off-hook detecting means to the line side. By connecting the line to the external telephone , the off-hook detecting means and the calling signal detecting means, and controlling the output of the supplying means to be off, and the line is controlled by the external telephone , the off-hook detecting means and the calling signal. When the polarity detecting means detects the reversal of the line in the state connected to the signal detecting means, the first switching means connects the external telephone and the off-hook detecting means to the supply means side, the off-hook detection voltage to said off-hook detecting means to turn on the output of said supply means Feeding and, thereafter, when the call signal from the line by the ringing signal detecting means is detected, switching the line by the second switching means to said data communication means side, DTMF signal is detected by said data communication means Then, in response to the detected DTMF signal, the data communication device controls the supply means to supply a pseudo call signal to the external telephone .

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