JPH0993359A - Communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the communication equipment to conduct its operation with a small power consumption and to attain proper changeover of an incoming call between an externally mounted telephone set and a communication equipment such as a facsimile equipment even when the service from a company of channels is not yet received when a telephone number of a dial-in service is registered. SOLUTION: An externally mounted telephone set is connected to a line in the standby state to release an output of a pseudo CI and a DC voltage application circuit 32, and when a polarity inversion detection circuit 23 detects the polarity inversion of the line, an output of the pseudo CI and the DC voltage application circuit 32 is active to supply a hook-off detection voltage to a hook- off detection circuit 30. Then an H relay 31 is used to switch the externally mounted telephone set to the pseudo CI and the DC voltage application circuit 32 and a hook-off detection voltage is applied only when it is required for call reception control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device, and more particularly to a communication device such as a facsimile device compatible with a dial-in service.

[0002]

2. Description of the Related Art In recent years, when a call is received, a DTMF signal is transmitted from a central office, and one of a plurality of terminals (for example, a telephone, a facsimile machine, a data terminal, etc.) connected to a line is designated as a called terminal. In-service is provided. This dial-in service
Although it is necessary to use a device corresponding to a private branch exchange, this is a service that can be easily used when the user has a plurality of devices and wants to use a direct number for each of them.

In order to receive a dial-in service using an existing telephone, a facsimile machine, a data terminal, etc., a device corresponding to a private branch exchange that analyzes the DTMF signal from the exchange and selects the terminal connected to the line is installed. Although it is used, a facsimile machine capable of connecting an external telephone is also considered to be compatible with such a dial-in service.

[0004]

In the conventional facsimile apparatus compatible with the dial-in service, the anti-reverse detection circuit for detecting the polarity reversal of the dial-in service is provided, and the external telephone is made to ring by the ringing signal when an incoming call arrives. Dial-in service to control direct incoming calls to multiple terminals including external telephones without having to do so, and to realize functions such as automatic response by voice message and incoming calls to external telephones The telephone is switched to the off-hook detection voltage supply side instead of the line side, and the telephone is provided by the off-hook detection circuit for detecting the off-hook of the external telephone and the off-hook detection voltage supply means for supplying the off-hook detection voltage to the line. It has been proposed to monitor the state of the Hook.

However, the above-mentioned conventional structure has a problem that the off-hook detection voltage is supplied even in the standby state, and therefore the power consumption in the standby state of the apparatus is large.

Further, in the conventional facsimile apparatus compatible with the dial-in service, when the 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 to the facsimile. Also, when calling to an external telephone, it is expected that a DTMF signal indicating the telephone number corresponding to the telephone will be transmitted from the exchange, and when the service cannot be received from the line carrier, the external telephone In some cases, the incoming call cannot be properly switched between the communication mechanism such as a facsimile and the like. Since it is not always possible to receive the service from the carrier immediately after applying for the dial-in service, it is necessary to consider when to register the direct dialing number in such a configuration, which is troublesome for the user. There is a problem.

Therefore, an object of the present invention is to operate with low power consumption, and at the time of registering the telephone number of the dial-in service, even if the service cannot be received from the line carrier, the external telephone and the facsimile. It is to provide a communication device capable of appropriately switching an incoming call between communication mechanisms such as.

[0008]

In order to solve the above problems, according to the present invention, in standby mode, an external telephone is connected to the line side to turn off the pseudo call signal and the output of the DC voltage supply means. , When the polarity reversal of the line is detected, the pseudo call signal and the output of the DC voltage supply means are turned on to supply the off-hook detection voltage of the external telephone, and the external telephone is connected to the pseudo call signal and DC voltage supply means side. It is controlled so that it is switched to, and the off-hook detection voltage is supplied only when it is necessary for incoming control.

Further, according to the present invention, a DTMF signal detecting means for detecting a DTMF signal and a dial-in service D
When the TMF signal is not detected, the control is performed such that an appropriate terminal is selected from the communication means and the external telephone according to the result of detection of the predetermined procedure signal for a predetermined time to receive the call.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall construction of a facsimile apparatus embodying the present invention.

In FIG. 1, the NCU 1 switches the line connection between the external telephone 2 side and the facsimile main body side, details of which will be described later with reference to FIG.

The tone detection unit 3 uses the CNG (1100H
z) or BT (400 Hz) or the like, and the DTMF detection unit 4 uses D for the dial-in service (or other service) transmitted from the exchange.
The TMF signal is detected. The modem 5 is for performing modulation / demodulation of image signals to be transmitted / received, and the voice transmission 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 includes a light source for illuminating the document, a document conveying system, and the like. The recording unit 13 records a received image or the like on a recording sheet, and is composed of a heat-sensitive or electrophotographic recording mechanism. 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 apparatus.

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

In FIG. 2, 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 external telephone 2. The polarity reversal detection circuit 23 is a circuit for detecting the polarity of the line,
a and 40-b are the outputs. The polarity reversal detection circuit 23 detects the polarity when the line is open. 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-
It is assumed that b becomes "L". However, if the line is closed by facsimile or external telephone 2, output 40
Both -a and 40-b are "L".

In this embodiment, the CPU 8 monitors the ports 40-a and 40-b of the polarity inversion detection circuit 23 by the control unit 7 at a certain cycle. Then, when the power is turned on, 40-
The output values of a and 40-b are stored in the RAM 9, and this polarity is set as the normal polarity (K), and polarity reversal and depolarization 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 NCU1, so either output is "
The polarity when it becomes “H” is the normal polarity (K).

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 satisfies the DC resistance value at the time of capturing the line of the facsimile main body. Circuit. The transformer 26 is a transformer that separates the line from the modem side in terms of direct current, and the signal lines 38 and 39 are lines for transmitting a transmission / reception signal to the modem 5 in FIG.

The off-hook detection circuit 30 is a circuit for detecting the off-hook of the external telephone 2, and outputs an off-hook detection signal to the control section 7 via the 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 the DC for off-hook detection from the pseudo CI and DC voltage generation circuit 32.

The pseudo CI and DC voltage generating circuit 32 is
A function of inputting a pseudo CI (call signal) to a telephone connected to the line pair 22 and ringing the same,
It is also used for the function of supplying the direct current necessary for the detection of the off-hook detection circuit 30 provided in.

That is, the pseudo CI and DC voltage generation circuit 32 generates a pseudo CI signal which oscillates at about + 24V to -150V in response to the signal on the signal line 34 sent from the control unit 7, and causes the external telephone 2 to ring. . That is, the pseudo CI and DC voltage generation circuit 32 pseudo-forms a state when a CI (call) signal is received in a normal telephone.

Further, the pseudo CI and DC voltage generating circuit 3
No. 2 is configured to be able to supply about 24V when no pseudo CI is generated. This circuit 32 is made selectable to generate or not to generate this DC voltage according to the signal on the signal line 35 sent from the control unit 7.

The H relay 31 is a relay for selectively switching the connection of the external telephone 2 to the line side or the pseudo CI and DC voltage generating circuit 32 side.

The CI detection circuit 29 is a circuit for detecting the CI (call signal) from the line, and the CI detection signal is output from the signal line 36 to the control unit 7.

The audio transformer 27 is a transformer for separating the tone detecting circuit 28 and the line, 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 the signal line 37.

FIG. 7 is a flow chart showing the operation of the apparatus of FIG. The procedure shown is controlled by the CPU 8 of the control unit 7.
It is stored in M10. It is assumed that the parts of the same alphabet in FIG. 7 are connected there.

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. At the start of the flowchart of FIG. It is assumed that the dial-in service compatible mode has already been selected.

In the 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. These direct numbers are the RAM of Figure 1.
9 or an EEPROM (not shown) or the like.
Further, these direct numbers are transmitted from the exchange when receiving a call.

At this time, in the standby state, the CML relay 24 is off (external telephone 2 side), and H
The relay 31 is off (line side), and the pseudo CI and DC voltage generation circuit 32 is off (no pseudo CI or DC voltage is generated).

First, it is monitored whether or not there is a polarity reversal from the line in the standby state (step S
1) If there is no polarity reversal, the output 33 of the off-hook detection circuit 30 checks whether or not the external telephone 2 is off-hook (step S2). Then, when the off-hook is detected, the processing at the time of talking on the external telephone 2 is performed (step S4). If no off-hook is detected, after waiting for 100 ms (step S3), the operation returns to the standby state. In addition, the wait time of (step S3) is within a range where there is no problem in monitoring the state,
Changes are possible.

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 the DC voltage are supplied. A DC voltage is generated from the generation circuit 32, and the H relay is turned on (pseudo CI and DC voltage generation circuit 32 side) (step S5).

Next, the timer 1 is started (step S6), and it is checked by the output 36 of the CI detection circuit 29 whether or not the CI (call signal) has arrived from the line (step S7). Here, the measured time T of the timer 1
1 = 5 seconds, but can be changed.

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 measured 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).
After that, the polarity is stored (step S31), and the process returns to the standby state.

When the CI is detected in the above (step S7), the CML relay 24 is turned on (FAX side) (step S9).

Next, the timer 2 is started (step S10), and the DTMF signal sent from the exchange is detected (step S11). This DTMF signal is a 4-digit telephone number for which a dial-in service contract is made.
Here, the time count T2 of the timer 2 is set to 3 seconds, but it can be changed.

In the above (step S11), the DTM
If the F signal cannot be detected, the CNG signal is detected (step S16). If CNG cannot be detected, it is checked whether or not 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.
When the time measured by the timer 2 has elapsed or when CNG is detected, the process of switching to the facsimile is performed as in the conventional case (step S18).

When the 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), and if the detected DTMF signal is the telephone number for facsimile of the dial-in service ("0001" in this embodiment), the facsimile Communication processing is performed (step S15).

The detected DTMF signal is the number for the telephone of the dial-in service ("0002" in this embodiment).
If so, it is checked whether the external telephone 2 is off-hook (step S19), and if it is off-hook, it waits for being on-hook. If it is on-hook, the pseudo CI is transmitted (step S20).

Next, the timer 3 is started (step S21), and polarity reversal is detected (step S22).
When the other party abandons communication on the way, the line is repolarized (K). The time measured by the timer 3 is T3 = 60 seconds, but it can be changed.

When this repolarization 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 is turned on.
And the DC voltage from the DC voltage generation circuit 32 is stopped (step S30). After that, the polarity is stored (step S31), and the process returns to the standby state.

When the repolarization is not detected, the external telephone 2
Is checked off-hook (step S24). If it is on-hook, it is checked whether or not the set time of the timer 3 has passed (step S32). If not, the polarity inversion is checked again (step S22).

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. Then, the pseudo CI
And the DC voltage from the DC voltage generating circuit 32 is stopped (step S34). Then, the CML relay 24 is turned on (FAX side), and the voice transmission unit 6 sends out a message saying "I am absent now. Please try again later." (Step S36), and turns off the CML relay 24 (externally attached). (Telephone 2 side) (step S37). After that, the polarity is stored (step S31), and the process returns to the standby state.

In the above (step S24), when the 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, The DC voltage from the pseudo CI and DC voltage generation circuit 32 is stopped (step S2).
6). Then, 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), the polarity is stored (step S31),
Return to standby state.

Next, referring to the time charts of FIGS. 3 to 6, the operation of the relay of the present embodiment, the polarity of the line, the pseudo CI and the change in the voltage sent from the DC voltage generating circuit 32 in the dial-in service will be described. explain.

FIG. 3 shows the case of an incoming call to the telephone number "0001" (facsimile) (step S in FIG. 7).
1 to S7 to S11 to S14 to S15).

In FIG. 3, 101-a indicates a change in the polarity of the line, 102-a indicates the operation of the CML relay, and 103.
-A represents the operation of the H relay, and 104-a represents the change in the voltage from the pseudo CI and DC voltage generation circuit 32.

Further, t1 is the timing at which the polarity is inverted, and t2 is the timing at which the remote signal 35 and the H relay are thereby turned on. Also, after polarity reversal,
Since the CI is received and the output 36 of the CI detection circuit 29 is turned on, the control unit 7 checks whether the received signal is the CI. Then, when it is determined to be CI at time t3, the CML relay 24 is 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. t3 to T1 (in the present embodiment, 5
00 ms) time, the detection is completed, and at time t4,
The CML relay 24 is turned off to break the DC loop. In addition, T1 needs to be within about 2.1 seconds.

Subsequently, T2 (in this embodiment, 500 m
s) During time, compare the detected DTMF signal with the registered telephone number. In this case, "0001" has been received, and since it is the registered telephone number for facsimile, the CML relay 24 is turned on again at the time of t5,
Move on to facsimile reception. When the line is captured at t5, the polarity of the line is restored (secondary response).

Next, FIG. 4 shows the case of an incoming call to the telephone number "0002" (telephone) (step S1 in FIG. 7).
~ S7 ~ S11 ~ S14 ~ S19 ~ S23 ~ S24 ~ S
Equivalent to 25).

In FIG. 4, 101-b indicates the change in the polarity of the line, 102-b indicates the operation of the CML relay, and 103.
-B represents the operation of the H relay, and 104-b represents the change in the voltage from the pseudo CI and DC voltage generating circuit 32. Moreover, t1, t2, t3, and t4 are the same timing as the above.

Subsequently, T2 (500 m in this embodiment)
s) During time, compare the detected DTMF signal with the registered telephone number. In this case, it is "0002", which is the registered telephone number for the telephone. Therefore, at time t5, the pseudo CI and the DC voltage generating circuit 32 generate the pseudo CI.
Is generated 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, the DC loop is formed again, so
The polarity of the line returns (secondary response). Further, the pseudo CI is stopped, the remote signal 35 is turned off, and the DC voltage is also turned off.

FIG. 5 shows the case where the telephone number "0002" of the dial-in service is transmitted as in FIG.
It shows a case where the calling side hangs up without anybody answering the phone (steps S1 to S7 to S11 to S14 to S in FIG. 7).
19 to S22 to S23).

In FIG. 5, 101-c indicates a change in the polarity of the line, 102-c indicates the operation of the CML relay, and 103.
-C represents the operation of the H relay, and 104-c represents the change in the voltage from the pseudo CI and DC voltage generating circuit 32. Further, t1, t2, t3, t4, and t5 have the same timing as in FIG.

In FIG. 5, since the calling side hung up the telephone and opened the line at time t6, the polarity of the line is restored. On the facsimile side of the present embodiment, at time t6, the polarity reversal detection circuit 23 detects that the polarity has been restored, the pseudo CI is stopped, the remote signal 35 is turned off, and the DC voltage is turned off. .

FIG. 6 also shows a case where the dial-in service number “0002” is transmitted as in FIG. 4, but no one answers the call for a certain period of time (FIG. 7).
Steps S1 to S7 to S11 to S14 to S19 to S2
3 to S24 to S32 to S33).

In FIG. 6, 101-d indicates a change in the polarity of the line, 102-d indicates the operation of the CML relay, and 103.
-D is the operation of the H relay, 104-d is the change in the voltage from the pseudo CI and DC voltage generating circuit 32, and 105 is the voice transmission. Also, t1, t2, t3, t4, t5
Is the same timing as above.

At time t6, a fixed time (T3) has passed since t5.
If the above has passed (timer 3 has timed out), the 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, the DC loop is formed again, so that the polarity of the line is restored (secondary response). Then, the voice sending unit 6 sends the message. Then, at t8, the transmission of the message ends and the line is released.

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 in standby, and the output of the off-hook detection voltage supply means is turned off to set the polarity. When the inversion is detected, the output of the pseudo CI and the DC voltage generation circuit 32 is turned on to supply the off-hook detection voltage, and the external telephone is switched to the off-hook detection voltage supply side, so that the off-hook detection voltage is supplied only when necessary. It is possible to supply the data, realize a ringing-free incoming call when the dial-in service is received, and reduce the power consumption of the device during standby.

Even when the telephone number of the dial-in service is registered, even if the service is not available yet, if a call arrives in the normal method (to the telephone number used before), the same as before. It is possible to switch between the facsimile and the telephone, and the facsimile and the telephone can be smoothly switched.

In the above description, the facsimile machine to which the external telephone can be connected has been described as an embodiment. However, the facsimile machine may be a data processing device such as a computer system and other than voice communication performed by the device. It goes without saying that the communication is not limited to the above embodiment.

[0063]

As is apparent from the above description, according to the present invention, during standby, an external telephone is connected to the line side to turn off the output of the pseudo call signal and the DC voltage supply means. When polarity reversal of the line is detected,
The output of the pseudo call signal and DC voltage supply means is turned on to supply the off-hook detection voltage of the external telephone, and the external telephone is controlled to switch to the pseudo call signal and DC voltage supply means side, which is necessary for incoming call control. Since the off-hook detection voltage is supplied only at such times, it is possible to provide an economical communication device that consumes less power during standby. In addition, DT which detects the DTMF signal
MF signal detection means and dial-in service DTMF
When no signal is detected, a control is performed to select an appropriate terminal from the communication means and the external telephone according to the result of detection of a predetermined procedure signal for a predetermined time, and perform reception. Appropriate incoming call switching can be performed between an external telephone and a communication mechanism such as a facsimile.
There is an excellent effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a facsimile apparatus adopting the present invention.

FIG. 2 is a block diagram showing a configuration of an NCU portion of FIG.

FIG. 3 is a time chart diagram showing an operation when a call arrives at a facsimile in the configuration of FIG.

FIG. 4 is a time chart diagram showing an operation when a call is received by an external telephone in the configuration shown in FIG.

FIG. 5 is a time chart diagram showing an operation in the case where an external telephone receives an incoming call and the calling side hangs up the telephone in the configuration of FIG. 1;

FIG. 6 is a time chart diagram showing an operation in the case of receiving a call to the external telephone and transmitting a voice message without a response for a fixed time in the configuration of FIG.

FIG. 7 is a flowchart showing the incoming call control in the configuration of FIG.

[Explanation of symbols]

 1 NCU 2 External telephone 3 Tone detection section 4 DTMF detection section 5 Modem 6 Voice transmission section 7 Control section 8 CPU 9 RAM 10 ROM 11 Timer 12 Reading section 13 Recording section 14 Operation section 15 Power supply section 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 (2)

[Claims] 1. A polarity detecting means for detecting a polarity reversal of a line, an off-hook detecting means for detecting a state of an external telephone, a pseudo call signal and a DC voltage supplying means for supplying a voltage for off hook detection and a pseudo call signal. Switching means for switching the external telephone to either the line side or the pseudo call signal and DC voltage supply means side; and a control means for ON / OFF controlling the output of the pseudo call signal and DC voltage supply means, It has a communication means to communicate by a predetermined communication method that uses a line with an external telephone, and in standby, connects the external telephone to the line side,
The outputs of the pseudo call signal and the DC voltage supply means are turned off, and when the polarity reversal of the line is detected, the output of the pseudo call signal and the DC voltage supply means is turned on by the control means to turn off hook detection voltage. And the external telephone is controlled by the switching means to be switched to the pseudo call signal and DC voltage supply means side. 2. A DTMF signal detecting means for detecting a DTMF signal transmitted from a line is provided, and when a DTMF signal of a dial-in service is not detected, a predetermined procedure signal is detected for a predetermined time. 2. The communication apparatus according to claim 1, wherein control is performed to select an appropriate terminal from the communication means and the external telephone to receive an incoming call.