JPH08307555A - Facsimile equipment - Google Patents

Abstract

PURPOSE: To provide a facsimile equipment capable of detecting off-hook during the transmission of a calling signal without using any line current detecting means on an NCU by incoporrating a calling signal generating means in the power source part of the equipment and using the output signal of an overcurrent detection circuit to detect the off-hook. CONSTITUTION: A calling signal generating part 21 outputs a pseudo calling signal (Ci signal) to an automatic answering telephone 16 and is incorporated in a power source part 5. The calling signal generating means 21 for sending the calling signal is provided inside the DC power source 5 of communication equipment, and off-hook during the transmission of the calling signal is detected by using an overcurrent detecting means 42 of the calling signal generating means 21. Therefore, since the calling signal generating circuit 21 is provided at the DC power source part 5 of the communication equipment and the output signal for detecting the overcurrent of the calling signal is used, the response time for the off-hook detection of a telephone set can be shortened. Even while the calling signal is transmitted, off-hook can be instantaneously detected and the sending of the calling signal can be automatically stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to off-hook detection during transmission of a ringing signal in a facsimile apparatus provided with a ringing signal generating means and an off-hook detecting means inside a DC power source.

[0002]

2. Description of the Related Art Conventionally, there is a facsimile apparatus having a function of activating an answering machine and ringing a ringing tone of the telephone. In such a facsimile machine, N
A calling signal circuit is formed on a printed circuit board of the CU or an independent printed circuit board, and a calling signal is sent from this circuit to perform an operation of activating the answering machine and ringing a ringing sound of the telephone.

In the conventional calling signal generating circuit, in order to obtain a calling signal of high voltage (+ 24V to -150V),
The DC-DC converter system is adopted as the power supply voltage, and the boosted voltage obtained on the secondary side is controlled by a control signal from the main body of the facsimile apparatus.
Here, the off-hook detection of the telephone during transmission of the pseudo call signal is detected by the line current detection means mounted on the NCU board.

[0004]

However, in the above-mentioned conventional example, the off-hook detection during ringing of the telephone by the pseudo call signal is performed by adding the time constants C and R to the signal from the line current detecting means on the NCU. Since it was detected by a signal having a curved shape, it had the following drawbacks.

(1) Since a photocoupler, a current detection reed relay or a current detection IC using a hall element is used as the line current detection means, when considering the direct current resistance of the telephone connected to the facsimile apparatus, The influence of the DC resistance of the line current detection means cannot be ignored.

(2) Since the off-hook detection during ringing of the telephone by the pseudo call signal is detected when the pseudo call signal is interrupted, the off-hook detection can be sent to the off-hook of the telephone, and it takes time to detect the off-hook.

(3) The off-hook detection during ringing of the telephone by the pseudo call signal is detected when the pseudo call signal is interrupted. Therefore, the off hook detection can be sent to the off hook of the telephone, and the pseudo call signal is sent after the telephone is off hook. Since the pseudo call signal is input to the telephone until the sending of the call is stopped, the pseudo call sound leaks from the handset, which is uncomfortable.

An object of the present invention is to provide a facsimile apparatus capable of performing off-hook detection during transmission of the ringing signal without using the line current detection means on the NCU.

[0009]

According to the present invention, ringing signal generating means for transmitting a ringing signal is provided inside a DC power supply of a communication device, and an off-hook detection during the ringing signal transmission is detected by the ringing signal generating means. This is done using a current detection means.

Therefore, according to the present invention, a call signal generating circuit is provided in the DC power supply unit of the communication device, and an output signal for detecting an overcurrent of the call signal can be used to accelerate the response time of off-hook detection of the telephone. Even while the signal is being sent, the off-hook can be instantly detected and the sending of the ringing signal can be automatically stopped.

[0011]

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

The CPU 1 controls the entire facsimile apparatus according to the program stored in the ROM 2. The non-volatile memory 4 is the power source 5 of the facsimile machine.
It stores the data that should be saved even if is blocked.

The recording unit 6 is controlled by the CPU 1 and RA
The reading data is stored in the M3 and is printed out as a hard copy.
Under the control of the CPU 1, binarizes the data read using the CCD, and sequentially binarizes the binarized data.
It is sent to AM3.

The modem section 8 is composed of G3, G2, G1, FM modems and a clock generation circuit connected to these modems. Under the control of the CPU 1, a RAM is provided.
3 modulates the transmission data stored in No. 3 and outputs it to the telephone line 10 via the NCU unit 9. Further, the modem unit 8 receives the analog signal of the telephone line 10 from the NCU.
The data is introduced through the unit 9, demodulated, and binarized data is stored in the RAM 3.

Under the control of the CPU 1, the NCU unit 9 connects the telephone line to the modem unit 8 or the main telephone unit 11 and the answering machine 1.
6 is used for connection.

The power supply unit 5 is for generating the main power supply of the facsimile apparatus, and has an AC input (primary side).
Is configured to obtain a DC output. Also,
A power source for a calling signal for activating the answering machine 16 and ringing the main telephone section 11 is generated.

The call signal generator 21 outputs a pseudo call signal (Ci signal) to the answering machine 16 and is incorporated in the power supply unit 5. The Ci detection section 22 detects a ringing signal from the line 10.

FIG. 2 is a block diagram showing the configuration of the NCU unit 9.

The NCU unit 9 connects the line 10 to the telephone 11,
CM for selectively switching connection between the 16 side and the modem section 8 side
The L relay 17, the off-hook detection circuit 18 for detecting the response of the main telephone section 11, the off-hook detection circuit 19 for detecting the response of the answering machine 16, the answering machine 16 on the line 10 side and the calling signal generating section 21 side. And a K relay 20 which is selectively switched and connected.

FIG. 3 is a flow chart showing the operation at the time of an incoming call in this embodiment.

First, the fact that the answering machine 16 is connected is registered in the nonvolatile memory 4 by a software switch or the like.

When there is an incoming call from the line 10 (S1), the CPU 1 sends K before the answering machine 16 answers.
After switching the relay 20 to the A side (call signal generating section 21 side) (S2), the Ci detecting section 22 detects Ci (S3). If it is not Ci, the K relay 20 is switched to the B side (line 10 side) and the process returns (S13).

If it is Ci in S3, the CML relay 17 is switched to the B side (modem 8 side) and the line 10 is captured (S4) to determine whether the call is from a facsimile or a telephone. Is determined (S5). If it is determined to be a facsimile here, the operation shifts to a facsimile communication operation (S14).

On the other hand, if it is determined that the incoming call is from a telephone, the software switch is checked (S6). If the setting is that the answering machine 16 is not connected,
The operation shifts to the call operation by the main telephone unit 11 (S15). In the present embodiment, the facsimile communication and the telephone call by the main telephone unit 11 are omitted, and the starting operation of the answering machine 16 will be described.

That is, in S6, the answering machine 16
Is connected, the pseudo call signal generator 21 outputs the pseudo call signal of the frequency registered in advance in the non-volatile memory 4 a predetermined number of times or a predetermined time in order to activate the answering machine 16. S7).

Then, the answering machine 16 is monitored for the off-hook response signal 41 from the off-hook detection circuit 42 using the overcurrent detection of the ringing signal generator 21 in the DC power supply (S8), and the response is made within the fixed time T. If there is not, the process proceeds to the next process (S9, S10). Also, if there is a response, CML
The relay 17 is switched to the A side (the answering machine 16 side) (S11), and the answering process of the answering machine 16 is performed (S1).
2).

FIG. 4 is a circuit diagram showing the configuration of the power supply unit 5.

The power supply unit 5 is an AC for inputting an AC voltage.
A plug 30, a power switch 31, a fuse 32,
Noise filter 33, rectifier circuit 34, smoothing circuit 35
And over voltage detection, over current protection, PW of switching power supply
A power supply control unit 36 including an M control and shutdown circuit, a transformer 37, a regulator unit 38 that outputs a DC voltage to each circuit, and a call that switches the voltage obtained from the transformer 37 to generate the pseudo call signal. The signal generator 21 and the main circuit of the facsimile machine (CPU
1) The photocoupler 40 for inputting a control signal for controlling the switching operation of the calling signal generator 21 to control ON / OFF of the pseudo calling signal from the side 1).
That is, the main circuit side and the call signal generating section 21 are electrically separated by the photocoupler 40.

FIG. 7 is a timing chart showing the timing of the pseudo call signal.

This pseudo call signal is a sine wave with an effective value of 75 V _RMS , and a DC voltage is superimposed on it. CPU1 above
Controls the photo coupler 40 on / off by controlling the output port of the control signal of the pseudo call signal in the parallel input / output unit (PIO) 12. Then, when the photocoupler 40 is on, a sine wave of 75V _RMS is output to the output end of the ringing signal generator 21, and the photocoupler 4
A DC voltage of +24 V is output when 0 is off.

By the way, the detection of the ringing signal of the usual answering machine is controlled so as to capture the line at the break of the ringing signal. The conventional off-hook detection during sending of the pseudo call signal (FIGS. 5 and 6) is detected while the pseudo call signal is OFF (stopped). However, if a person picks up the handset, the timing at which the handset is picked up does not necessarily mean that the handset is picked up while the pseudo call signal is off. Therefore, when the receiver is lifted while the pseudo call signal is being transmitted by the conventional control, the sound of the pseudo call signal is heard from the receiver, which is uncomfortable, and the problem is to speed up the response of off-hook detection.

Therefore, in order to solve this, the off-hook detection circuit 42 by the overcurrent detection of the ringing signal generator 21.
Is provided to speed up the response to the off-hook detection during the sending of the pseudo call signal and automatically stop the sending of the pseudo call signal immediately.

FIG. 8 is a timing chart showing off-hook detection during sending of the pseudo call signal.

If the handset of the answering machine is lifted while the pseudo call signal is being sent, the pseudo call signal generating circuit is terminated by the DC resistance of the answering machine. Here, the DC resistance of the telephone is defined by technical standards and is 50 to 300 ohms. That is, when the direct current resistance is terminated from 50 ohms to 300 ohms, the overcurrent detection circuit 42 of the ringing signal generator
Automatically stops the ringing signal immediately and outputs an off-hook response signal.

Therefore, the off-hook response signal is sent to the CPU.
1 to detect that the handset of the answering machine has been hooked up.

By controlling in this manner, it is possible to immediately detect off-hook even while the pseudo call signal is being sent.

Next, the off-hook detection of the answering machine 16 during communication will be described. When the pseudo call signal is not transmitted, the pseudo call signal has a predetermined DC voltage (+24
V) is output. On the other hand, during communication, the answering machine 16
Switch the K relay 20 to the A side. That is, a voltage of + 24V is applied to the answering machine 16.

When the answering machine is off-hook, +24 V output from the pseudo call is applied to the telephone,
The off-hook of the answering machine is detected by detecting the current flowing when off-hook by a photo coupler on the NCU, a current detection reed relay, or a current detection IC using a hall element.

Next, the off-hook detection circuit 42 of this embodiment.
A more detailed configuration example of the above will be described in comparison with the related art.

FIG. 9 is a block diagram showing the configuration of the peripheral portion of the off-hook detection circuit 42 shown in FIG.
0 is a circuit diagram showing an internal configuration of the off-hook detection circuit 42.

In FIG. 9, the calling signal generating section 21 has an O
It has an N / OFF section 21a, a frequency changing section 21b, and an output drive section 21c. Further, the circuit shown in FIG. 10 constitutes a current detection circuit by the operational amplifier 42a, the photocoupler 41, and the like.

FIG. 11 is a circuit diagram showing an internal configuration example of the off-hook detection circuit 19 shown in FIG. The configuration shown in FIG. 11 is the same as the conventional one.

In the conventional off-hook detection, the off-hook detection circuit 19 shown in FIG. 2 detects off-hook during pseudo CI transmission, communication, communication, and standby. Therefore, in the off-hook detection during sending of the pseudo CI (during ringing of the telephone), a delay is caused by the CR time constant circuit, and the pseudo CI sound leaks from the handset, which is uncomfortable.

Therefore, in the present embodiment, the off-hook detection during pseudo CI transmission is detected by the current detection circuit shown in FIG. 10 added to the pseudo CI circuit to detect the current during pseudo CI transmission. That is, when the telephone is off-hook, the impedance (DC resistance) of the telephone becomes 50 to 300 ohms and the current increases. When this is detected, the transmission of the pseudo CI is stopped, and at the same time, an off-hook signal is returned to the CPU 1,
PU1 detects this off-hook of the telephone by reading this off-hook signal.

Next, a second embodiment of the present invention will be described.

FIG. 12 is a block diagram showing the configuration of the key telephone system according to the second embodiment.

In the figure, a dedicated telephone 105 is a 4-wire button telephone connected to the main unit 101 via a telephone line 103 and a control line 104. Main device 10
Reference numeral 1 has a function of exchanging a plurality of dedicated telephones.

The main device interface 122 of the dedicated telephone 105 receives a control code such as a calling code from the main device 101, and also sends a control code such as an off-hook code to the main device 101.

On the other hand, the dedicated telephone 105 is connected to the telephone line 10.
It is connected to the two-wire type facsimile machine 107 via 6 and plays the role of an adapter for connecting the facsimile machine 107 to the main apparatus 101.
Reference numeral 17b connects the main device 101 and the facsimile device 107.

The DC voltage circuit 1 of the dedicated telephone 105
23 includes a pseudo call signal generation circuit 119 and an off-hook detection circuit 132 that is transmitting the pseudo call signal. Further, the dedicated telephone 105 includes a control circuit 121, a non-volatile memory 124, a hook switch 126, an amplifier 127,
A speaker 128, a call circuit 129, a handset 130, a DC loop detection circuit 131, etc. are provided.

Next, FIG. 13 is a flow chart showing the operation of the dedicated telephone 105.

When the main device interface 122 detects the call code (S61), the control circuit 121 generates a pseudo call signal built in the DC power supply 123 by using a square wave having a frequency registered in the nonvolatile memory 124 as a control signal. Input to the section 119 to generate a ringing signal, and the call line 1
It is sent to the facsimile apparatus 107 via 06 (S6
2).

Then, the response of the facsimile apparatus 107 to the pseudo CI, that is, whether the facsimile apparatus 107 is started up by the pseudo CI, is determined by the DC power supply 1
This is done by monitoring the off-hook response signal from the off-hook detection means 132 using the overcurrent detection of the pseudo CI generating unit 23.

Here, when it is detected that the facsimile device 107 responds by the off-hook response signal within a certain time (S63, S64), the transmission of the pseudo CI is immediately stopped automatically, and the relay 117 is switched to communicate. The line 103 and the facsimile machine 107 are connected (S6
6) Then, shift to facsimile communication (S67). If there is no response, the process moves to the next process (S65).

[0055]

As described above, according to the present invention,
Since the ringing signal generator is built into the power supply of the equipment and off-hook detection is performed using the output signal of the overcurrent detection circuit of the ringing signal generator, the DC resistance and off-hook detection of the line current detection circuit as in the past have been performed. There is no need to worry about the response time of, and there is an effect that the response of off-hook detection can be made faster.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of an NCU unit in the above embodiment.

FIG. 3 is a flowchart showing an operation at the time of incoming call in the above embodiment.

FIG. 4 is a circuit diagram showing a configuration of a power supply unit in the above embodiment.

FIG. 5 is a timing chart showing the timing of a pseudo call signal in a conventional example.

FIG. 6 is a timing chart showing off-hook detection during transmission of a pseudo call signal in a conventional example.

FIG. 7 is a timing chart showing the timing of the pseudo call signal in the above embodiment.

FIG. 8 is a timing chart showing off-hook detection during sending of a pseudo call signal in the above embodiment.

9 is a block diagram showing a configuration of a peripheral portion of the off-hook detection circuit shown in FIG.

10 is a circuit diagram showing an internal configuration of the off-hook detection circuit shown in FIG.

11 is a circuit diagram showing an internal configuration example of the off-hook detection circuit shown in FIG.

FIG. 12 is a block diagram showing a configuration of a key telephone system according to a second embodiment of the present invention.

FIG. 13 is a flowchart showing the operation of the dedicated telephone in the second embodiment.

[Explanation of symbols]

 1 ... CPU, 2 ... ROM, 3 ... RAM, 4 ... Non-volatile memory, 5 ... Power supply section, 6 ... Recording section, 7 ... Reading section, 8 ... Modem section, 9 ... NCU section, 10 ... Line, 11 ... Book Telephone section, 12 ... PIO, 16 ... Answering machine, 21 ... Call signal generating section, 22 ... Ci detecting section.

Claims (4)

[Claims] 1. A facsimile apparatus, wherein a calling signal generating means for sending a calling signal for ringing a telephone connected to the facsimile apparatus is provided inside a DC power source means of the facsimile apparatus, and an input unit for controlling the calling signal generating means. It has an electrical separating means for electrically separating the output control signal, an off-hook detecting means for detecting an off-hook of the telephone connected to the calling signal generating means, and a calling signal stopping means for stopping the sending of the calling signal. At the same time, an off-hook detecting means for detecting an off-hook of the telephone is provided inside the calling signal generating means, and an off-hook response signal output from the off-hook detecting means is monitored to detect the off-hook of the telephone, and the calling signal When the phone goes off-hook during transmission,
A facsimile apparatus characterized in that the transmission of the calling signal is immediately stopped. 2. The facsimile apparatus according to claim 1, wherein the off-hook detecting means of the telephone connected to the calling signal generating means is constituted by using the overcurrent detecting means of the calling signal generating means. 3. The output signal of the ringing signal according to claim 1, wherein a DC voltage is superimposed on a sine wave, and when the ringing signal is not generated,
A facsimile machine characterized in that it outputs a predetermined DC voltage. 4. The off-hook detection during communication when a ringing signal is not generated by the ringing signal generating means and a predetermined DC voltage is output, and the ringing signal is not transmitted, according to claim 1. Facsimile machine characterized by using a DC voltage.