JPH08163346A - Fax machine - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to enable a facsimile machine to which an external telephone can be connected to support a dial-in service without purchasing a dedicated switching device. [Structure] For a dial-in service, a DTMF signal after a primary response is detected, the detection result is compared with a pre-registered telephone number, and if there is a corresponding telephone number, it is responded to by that number. To connect to a telephone or a telephone, and when the telephone is connected, ring the telephone,
Further, when polarity reversal is detected before the telephone is off-hook, the ringing of the telephone is controlled to stop.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine capable of supporting a dial-in service.

[0002]

2. Description of the Related Art In a conventional facsimile machine to which an external telephone can be connected, when a contract for dial-in service is made, it is necessary to connect a dedicated switching device to the line side and connect the telephone and the facsimile device to the switching device. there were.

[0003]

Therefore, conventionally, when using the dial-in service, it is necessary to purchase a dedicated switching device, which has a drawback of high cost.

It is an object of the present invention to enable a facsimile machine to which an external telephone can be connected to support a dial-in service without purchasing a dedicated switching device.

[0005]

The present invention detects a DTMF signal after a primary response to a dial-in service, compares the detection result with a pre-registered telephone number, and responds with the corresponding telephone number. If there is, it will connect to the facsimile or telephone depending on the number, ring the telephone when it is connected to the telephone, and if the polarity reversal is detected before the telephone is off-hook, stop ringing the telephone. The control realizes a facsimile device compatible with the dial-in service.

[0006]

1 is a block diagram showing the configuration of a facsimile apparatus according to an embodiment of the present invention.

In the figure, the NCU 1 switches the line connection between the telephone 2 side and the facsimile side.
Details will be described later with reference to FIG.

The tone detection section 3 uses the CNG (1100H
z), BT (400 Hz), and other tones, and the DTMF detection unit 4 detects DTMF signals. The modem 5 modulates / demodulates an image signal to be transmitted / received, and the voice sending unit 6 sends a voice message.

The control unit 7 controls the entire facsimile apparatus, and has a CPU 8 which is the center of control, stores images, stores various flags and tables, and controls CP.
A RAM 9 used as a work area of U8, a ROM 10 in which a control program is written, a timer 11 for various clocks, and the like are included.

The reading unit 12 reads an image on a document, and the recording unit 13 records a received image or the like on a recording sheet. The operation unit 14 is an L for performing various displays.
It is composed of a CD display unit and a keyboard for inputting various keys. The power supply unit 15 supplies power to the entire facsimile apparatus.

FIG. 2 is a circuit diagram showing the configuration of the NCU 1 of this embodiment.

The line pair 21 is a line pair connected to the telephone line, and the line pair 22 is a line pair connected to the telephone set 2. The anti-reverse detection circuit 23 is a circuit for detecting the polarity of the line, and 41-a and 41-b are outputs thereof. The anti-polarity detector 23 is designed to detect the polarity when the line is released, and the details will be described later with reference to FIG.

The CML relay 24 is a relay for selectively switching the line to the telephone side or the facsimile side, and the P relay 25 is a relay for generating a dial pulse. The S relay 26 is a relay for short-circuiting the line when a dial pulse is generated, and the RET coil 27 is a coil that forms a DC loop. The hybrid transformer 28 is a transformer for separating the line side and the modem side, the signal line 39 is a transmission side line, and the signal line 49 is a reception side line.

The off-hook detection circuit 29 is a circuit for detecting the off-hook of the telephone 2, and outputs a detection signal 37. The pseudo CI generation circuit 30 is a circuit for generating a pseudo CI signal that vibrates at approximately +27.6 to −150 V in order to ring the telephone 2. It should be noted that the pseudo CI generation circuit 30 outputs about 2 when the pseudo CI is not output.
It supplies 7.6V. The H relay 31 is a relay that switches the connection of the telephone between the line and the pseudo CI generation circuit 30.

The CI detection circuit 32 is a circuit for detecting CI from the line and outputs a detection signal 38. The audio transformer 33 has a line side and a detection circuit 3 for tone detection.
It is a transformer for separating the four sides and has an input impedance of about 20 kΩ. The tone detection circuit 34 is for detecting FC (1300 Hz) and outputs a detection signal 42.

Further, the pseudo busy tone generating circuit 35 is
It is a circuit that generates a pseudo busy tone.
It is connected to the line side via. When the off-hook is detected while the CML relay 24 is switched to the facsimile side, the B relay 36 is made and the pseudo busy tone generating circuit 35 sends the pseudo busy tone to the telephone.

FIG. 9 is a circuit diagram showing the configuration of the anti-polarity detection circuit 23.

The photocouplers 51-a and 51-b are connected to each other via a resistor 52 so that their directions are opposite to each other. And the DC resistance when open is 1MΩ
Because of the above-mentioned regulations, the resistance 52 is set to 1.1 MΩ in this embodiment. Further, a varistor 53 is inserted in parallel with the photocouplers 51-a and 51-b for protecting the photocoupler.

The receiving sides of the photocouplers 51-a and 51-b are 55 after being received by the transistors 54-a and 54-b.
It is input to the Schmitt buffers -a and 55-b, and the outputs 41-a and 41-b thereof are sent to the control unit 7.

When the line L1 is + and the line L2 is-, the photocoupler 51-b is turned on to output 41-b.
Becomes "H". When the line L1 is − and the line L2 is +, the output 41-a becomes “H” in the opposite case. However, when the line is closed by a facsimile or a telephone, the potential between the lines does not increase as much as the photocouplers 51-a and 51-b are turned on.
Both 1-b are "L".

In the present embodiment, the control unit 7 monitors the ports 41-a and 41-b at a certain cycle. Then, when the power is turned on, the output values of 41-a and 41-b are stored in the RAM 9, and this polarity is set as the normal polarity, and the polarity inversion and depolarization are checked. However, when the power is turned on, 41
If both -a and 41-b are "L", it means that the line is not connected to the line pair 21 of the NCU1, so the polarity when either output becomes "H" is the normal polarity. .

Further, with the configuration of the polar anti-detection circuit 23 of this embodiment, the polarity can be always checked, and therefore it can be used for collision monitoring.

Next, FIGS. 7 and 8 are flow charts showing the operation of this embodiment.

In the present embodiment, the operation mode corresponding to the dial-in service and the conventional operation mode can be selected by the key input of the operation unit 14, and the flowcharts of FIGS. 7 and 8 are started. At this time, it is assumed that the dial-in service compatible mode has already been selected.

In this dial-in service compatible mode, it is assumed that the telephone number "0001" is registered for facsimile and the telephone number "0002" is registered for telephone. At this time, in the standby state, the CML relay 24 is off (line side) and the P relay 2
5 is off (break), H relay 31 is on (pseudo CI
Generator circuit side).

First, in S1, it is monitored whether or not there is a key input from the operation unit 14, and if there is a key input, the process proceeds to S2 and the absence flag is turned off. The absence flag is assumed to be secured on the RAM 9. Then, in S3, key processing is performed.

If there is no key input in S1, the process proceeds to S4, and the output 37 of the off-hook detection circuit 29 checks whether or not the telephone 2 is off-hook. When the off-hook is detected, the process proceeds to S5, the absence flag is turned off, and the process proceeds to S21.

If the off-hook is not detected in S4, the process proceeds to S6 to detect the CI. And C
If I is not detected, the process returns to S1.

If CI is detected, the process proceeds to S7 and C
Turn on the ML relay 24 (FAX side) and set the P relay 25
Turn on (make up). Next, in S8, the DTMF signal sent from the exchange is detected. This DTMF signal is a 4-digit telephone number for which a dial-in service contract is made.

If the DTMF is detected in S8, the process proceeds to S9, the CML relay 24 and the P relay 25 are turned off, and in S10, the DT detected in S8 is detected.
The MF signal is compared with the registered telephone number. If the detected DTMF signal is a facsimile telephone number ("0001" in this embodiment), the process proceeds to S11.
The CML relay 24 and the P relay 25 are turned on, and the fax reception process is started in S12.

Further, in S10, the detected DTMF is detected.
The signal is a telephone number for a telephone (in this embodiment, "000").
2 "), the process proceeds to S13. If the absence flag is on, the process proceeds to S14, the CML relay 24 and the P relay 25 are turned on, and the process proceeds to S15.
From "I'm out right now. Please call back later."
Message is sent, the process proceeds to S16, the CML relay 24 and the P relay 25 are turned off, and the process returns to the standby.

If the absence flag is turned off in S13, the process proceeds to S17, in which the pseudo CI generating circuit 30 outputs the pseudo CI.
To ring the phone. Then, in S18, the timers 1 and 2 are initialized and started,
Turn off the timeout flag. The time-out flag is secured in the RAM 9. Further, the timers 1 and 2 are included in the timer 11. And timers 1 and 2
The timer 2 has a larger initial value of 30 seconds and 30 seconds in the present embodiment.

Next, in S19, the off-hook of the telephone is detected. When the off-hook is detected, S20
Then, the pseudo CI is stopped, the H relay 31 is turned off in the next S21, and the process proceeds to S22. In S22, a call process is performed, and when the call ends, the H relay 31 is turned back on in S23 and the process returns to the standby.

If the off-hook is not detected in S19, the process proceeds to S24, and it is checked whether the timer 1 has timed out. If the timer 1 has timed out, the process proceeds to S25, the timeout flag is turned on, and the process proceeds to S26. Also, in S24, the timer 1
If has not timed out, the process directly proceeds to S26.

In S26, it is checked whether the timer 2 has timed out. Then, if the timer 2 has timed out, the process proceeds to S29. If the timer 2 has not timed out, the process proceeds to S27 and the detection circuit 23
It is checked by the outputs 41-a and 41-b of 1. whether the polarity has been restored. Then, if the polarity is not depolarized, the process returns to S19, and if the polarity is depolarized, the process proceeds to S28.

In S28, the time-out flag is checked. If the time-out flag is on, the answer flag is turned on in S29, the pseudo CI is stopped in S30, and the process returns to the standby. If the timeout flag is off, the process proceeds directly to S30,
Stop the pseudo CI and return to standby.

Next, the operation of the relay of this embodiment and the change of the polarity of the line in the dial-in service will be described with reference to the time charts of FIGS.

FIG. 3 shows the case of an incoming call to the telephone number "0001".

In the figure, 101-a represents the operation of the CML relay, and 102-a represents the change of the polarity of the line. Further, t1 is the timing at which the CI arrives, and the polarity of the line is reversed at this point. Also, when the CI arrives,
Since the output 38 of the CI detection circuit 32 is turned on, the control unit 7 checks whether the incoming signal is CI. Then, at the time of t2, if the CI is confirmed, C
The ML relay 24 and the P relay 25 are turned on to capture the line (primary response).

After this, the last 4 digits of the telephone number from the exchange are D
Since it is sent as a TMF signal, the DTMF detector 4
To detect this. From t2 to T1 (500 in this embodiment)
msec) time, the detection is completed, and at time t3, CM
Turn off the L relay and P relay to disconnect the DC loop.
Note that T1 needs to be set within approximately 2.1 sec.

Then, T2 (500 mse in this embodiment)
c) During time, compare the detected DTMF signal with the registered telephone number. In this case, the number is "0001", which is the registered facsimile number, so at time t4, the CML relay 24 and the P relay 25 are turned on again and the facsimile reception is started. When the line is captured at t4, the polarity of the line is restored (secondary response).

Next, FIG. 4 shows the case of an incoming call to the telephone number "0002".

In the figure, 101-b indicates the operation of the CML relay, 103 indicates the operation of the H relay, 102-a.
Indicates a change in the polarity of the line. Also, t1, t2, t3
Is the same timing as above.

Then, after t3, the detected DTMF signal is compared with the registered telephone number. in this case,
Since it is "0002" and is a registered telephone number, a pseudo CI is generated from the pseudo CI generation circuit 30 to ring the telephone. When the telephone goes off-hook at time t5, the H relay is turned off and the DC loop is formed again at that time, so that the polarity of the line is restored (secondary response).

FIG. 5 shows a case where the telephone number "0002" is received, but no one answers the telephone, and the calling side hangs up the telephone.

In the figure, 101-c represents the operation of the CML relay, and 102-c represents the change in the polarity of the line. Also, t1, t2, and t3 are the same timings as above.

After t3, the detected DTMF signal is compared with the registered telephone number. in this case,
Since it is "0002" and is a registered telephone number, a pseudo CI is generated from the pseudo CI generation circuit 30 to ring the telephone. Further, at t6, the calling side hung up the telephone and opened the line, so that the polarity of the line is restored. On the facsimile side of the present embodiment, the polarity reversal detection circuit 23 detects that the polarity has been restored at time t6, and the pseudo CI is detected.
Stop.

FIG. 6 shows the case where an incoming call is made to the telephone number "0002" while the facsimile apparatus of this embodiment is in the absence mode.

In the figure, 101-d represents the operation of the CML relay, and 102-d represents the change in the polarity of the line. Moreover, t1, t2, t3, and t4 are the same timing as the above.

Then, after t3, the detected DTMF signal is compared with the registered telephone number. in this case,
Since it is "0002", which is the registered telephone number, the CML relay 24 and the P relay 25 are turned on again at t4, and then the message is sent from the voice sending unit 6 (secondary response). At t7, the transmission of the message ends and the line is released.

Next, as another embodiment of the present invention, an example of switching to the absence mode by key input from the operation unit 14 and canceling the absence mode by key input from the operation unit 14 and timer timeout Will be described.

10 and 11 are flowcharts showing the operation of this embodiment.

Since the construction of the facsimile apparatus, the operation of each relay, and the change of the polarity of the line are the same as those in the above-described embodiment, the description will be given here only with reference to the flow charts of FIGS. 10 and 11. .

Also in the case of this embodiment, the mode for operating the dial-in service and the conventional operation mode can be selected by key input on the operation unit 14, and at the start of the flowcharts of FIGS. The dial-in service compatible mode has already been selected, and the telephone number "000"
It is assumed that 1 ”is registered for facsimile and the telephone number“ 0002 ”is registered for telephone. At this time, in the standby state, the CML relay 24 is off, the P relay 25 is off, and the H relay 31 is on. Has become.

First, in S41, it is checked whether or not there is a key input from the operation unit 14 for instructing switching to the absence mode. Then, if there is a key input for instructing switching to the absence mode, the process proceeds to S42, and the absence flag is turned on. Then, in S43, the timer 3 is initialized and started. It should be noted that the timer 3 is included in the timer 11, and here the initial value is set to 60 minutes.

If there is no key input instructing to switch to the absence mode in S41, the process proceeds to S44 to check whether there is a key input instructing to release the absence mode. Then, if there is a key input for instructing cancellation of the absence mode, the process proceeds to S45, the absence flag is turned off, and the process proceeds to S46. If there is no key input for canceling the absence mode in S44, the process directly proceeds to S46.

In S46, it is checked whether the timer 3 has timed out. Then, if it has timed out, the process proceeds to S47, the absence flag is turned off, and the process proceeds to S48. If the timer 3 has not timed out, the process directly proceeds to S48.

At S48, CI is detected. If CI
If no CI is detected, the process returns to S41, and if a CI is detected, S
Proceed to 49. In S49, the CML relay 24 and the P relay 25 are turned on.

Next, in S50, the DTMF signal sent from the exchange is detected. This DTMF signal is a 4-digit telephone number for which a dial-in service contract is made.
Then, if DTMF is detected in S50, S5
1, the CML relay 24 and the P relay 25 are turned off, and in S52, the DTMF detected in S50 is detected.
Compare the signal with the registered phone number. And
If the detected DTMF signal is a telephone number for facsimile ("0001" in this embodiment), the process proceeds to S53 and CM.
The L relay 24 and the P relay 25 are turned on, and in S54, the FAX reception process is performed.

Further, in S52, the detected DTMF is detected.
The signal is a telephone number for the telephone (“0002” in this embodiment)
If so, proceed to S55, and if the absence flag is on, S5
6, the CML relay 24 and the P relay 25 are turned on, and the process proceeds to S57. In S57, the voice sending unit 6 sends out a message saying "I am out of office now. Please call again later."
Then, the P relay 25 is turned off and the operation returns to the standby.

If the answering flag is off in S55, the process proceeds to S59, in which the pseudo CI generating circuit 30 outputs the pseudo CI.
To ring the phone. Then, in S60, the timer 2 is initialized and started. The initial value of the timer 2 is 60 seconds in this embodiment.

Next, in S61, the off-hook of the telephone is detected. When the off-hook is detected, S62
Then, the pseudo CI is stopped, the H relay 31 is turned off in the next S63, and the process proceeds to S64. In S64, a call process is performed, and when the call ends, the H relay 31 is turned back on in S65 and the process returns to the standby.

If the off-hook is not detected in S61, the process proceeds to S66, and it is checked whether the timer 2 has timed out. If the timer 2 has timed out, the process proceeds to S68, the pseudo CI is stopped, and the process returns to the standby.

If it is determined in S66 that the timer 2 has not timed out, the process proceeds to S67, in which the extreme detection circuit 2 is detected.
It is checked by the outputs 41-a and 41-b of No. 3 whether the polarity is restored. If the polarity is not depolarized, the process returns to S61, and if the polarity is depolarized, the process proceeds to S68, the pseudo CI is stopped, and the process returns to the standby.

[0065]

As described above, according to the present invention,
As in the related art, there is an effect that the facsimile apparatus capable of connecting the external telephone can support the dial-in service without purchasing a dedicated switching device. Further, there is an effect that the malfunction of switching between the facsimile and the telephone, which has been a problem in the past, can be eliminated.

Further, when there is no person to receive the call, the incoming caller can be absent by detecting that he / she does not go off-hook even if the phone is ringed, or by registering that he / she will be out of office in advance. By sending the message to convey, the person making the call can immediately recognize that he / she is out. Also,
For the fax side that supports the dial-in service,
It is possible to reduce the time that the line is occupied by an incoming call to the telephone side, and to reduce the probability of a congestion state when an incoming call to the facsimile side is made.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of an NCU of the above embodiment.

FIG. 3 is a time chart showing the operation of the above embodiment.

FIG. 4 is a time chart showing the operation of the above embodiment.

FIG. 5 is a time chart showing the operation of the above embodiment.

FIG. 6 is a time chart showing the operation of the above embodiment.

FIG. 7 is a flowchart showing the operation of the above embodiment.

FIG. 8 is a flowchart showing the operation of the above embodiment.

FIG. 9 is a circuit diagram showing a configuration of a polar reversal detection circuit of the above-described embodiment.

FIG. 10 is a flowchart showing the operation of another embodiment of the present invention.

FIG. 11 is a flowchart showing the operation of the other embodiment.

[Explanation of symbols]

 1 ... NCU, 2 ... Telephone, 3 ... Tone detecting section, 4 ... DTMF detecting section, 5 ... Modem, 6 ... Voice sending section, 7 ... Control section, 8 ... CPU, 9 ... RAM, 10 ... ROM, 11 ... Timer , 12 ... reading unit, 13 ... recording unit, 14 ... operation unit, 15 ... power supply unit.

Claims (5)

[Claims] 1. A calling signal detecting means for detecting a calling signal, and a polarity detecting means for detecting a polarity reversal of a line,
An off-hook detecting means for detecting the state of the hook switch, a DTMF signal detecting means for detecting the DTMF signal,
DTMF after primary response to dial-in service, having telephone number registration means for registering telephone number
A signal is detected by the DTMF signal detecting means, and the detection result is compared with each telephone number registered in the registering means,
If there is a corresponding telephone number, connect it to a fax machine or telephone depending on the number, ring the telephone when connected to the telephone, and ring the telephone if polarity reversal is detected before the telephone is off-hook. Facsimile apparatus characterized by controlling to stop. 2. The method according to claim 1, further comprising switching means for switching from the first state to the second state and from the second state to the first state, and voice transmission means for transmitting a predetermined voice message, A facsimile apparatus, wherein the voice message is transmitted when an incoming call is received on the telephone side in the second state. 3. The device according to claim 2, wherein the means for switching from the first state to the second state is means for detecting that the time for calling the telephone is longer than a fixed time, and the detecting means calls the telephone. When it is detected that the time is equal to or longer than a certain time, it operates so as to be in the second state, and the means for switching from the second state to the first state is an off-hook detection means. Characteristic facsimile machine. 4. The facsimile according to claim 3, wherein the means for switching from the second state to the first state is automatically switched when a predetermined time elapses. apparatus. 5. The switching means for switching from the first state to the second state and from the second state to the first state according to claim 3, further comprising input from an operation unit. Characteristic facsimile machine.