JPH09214628A - Terminal network controller and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely execute the detection of a calling signal and the detection of an off-hook state and to facilitate the constitution of a circuit by reducing the scale of the circuit. SOLUTION: A signal transition detecting means 5 detects the voltage transition of an inter-terminal signal 4 being a signal between a pair of telephone connecting terminals T1 and T2, a frequency detecting means 6 detects the frequency of the inter-terminal signal 4 and a discriminating means 7 discriminates the existence of the calling signal inputted from a telephone line 1 through a pair of telephone line connection terminals L1 and L2 and whether or not a telephone equipment 2 is in an off-hook state based on the detecting states of voltage transition and the frequency, to surely discriminate an off-hook state and the receiving state of the calling signal. In addition, as the existence of the calling signal and the off-hook state of the telephone equipment 2 are discriminated by the same discriminating means, the circuit is shared to reduce the scale of the circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal network control device and a terminal network control method, and more particularly to a call signal detection circuit for detecting a call signal input to a telephone connected to the terminal network control device through a telephone line. And an improved technique of an off-hook signal detection circuit for detecting an off-hook state of a telephone.

[0002]

2. Description of the Related Art FIG. 9 shows a schematic block diagram of a conventional terminal network control device. The terminal network control device 80 uses the telephone line 8
1 is connected to the telephone line connection terminals L1 and L2, the telephone 82 is connected to the telephone connection terminals T1 and T2, and the telephone line connection terminals L1 and L2 are connected. Then, the ringing signal detection unit 83 that outputs the ringing signal detection signal SCL, the off-hook detection circuit 84 that detects the off-hook state of the telephone 82 and outputs the off-hook detection signal SOF, and the ringing signal detection signal SCL and the off-hook detection signal SOF are input. And a control unit (MPU; Micro Processing Uni) for controlling the entire terminal network control device 80.
t) 85, and is comprised.

FIG. 10 shows a more specific circuit configuration example of the ringing signal detection section 83 and the off-hook detection circuit 84 of FIG. The ringing signal detector 83 includes a first constant voltage diode 86 having an anode connected to the telephone line connection terminal L1 and a first constant voltage diode 86.
A second constant voltage diode 87 whose cathode is connected to the cathode of the constant voltage diode 86, and a telephone line connection terminal L2
A capacitor 88 having one terminal connected to the resistor 88, and a resistor 89 having one terminal connected to the other terminal of the capacitor 88.
And a cathode connected to the anode of the second constant voltage diode 87 and an anode connected to the other terminal of the resistor 89, and an anode connected to the anode of the second constant voltage diode 87 and the resistor Second photodiode 9 having a cathode connected to the other terminal of 89
1 and a phototransistor 92 that receives the light emitted from the first photodiode 90 or the second photodiode 91 and turns on to output a calling signal detection signal SCL.

Here, the general operation of the ringing signal detector 83 will be described. A call signal having a 16 Hz signal component input from the telephone line 81 has a DC component cut by a capacitor 88, and forms a AC loop by a first constant voltage diode 86, a second constant voltage diode 87, and a first photodiode 90. , The second photodiode 91, the resistor 89, and the capacitor 88, and the first photodiode 90.
Alternatively, one of the second photodiodes 91 is made to emit light.

As a result, the light emitted from the first photodiode 90 and the second photodiode 91 is received by the phototransistor 92, and the phototransistor 92 outputs the calling signal detection signal SCL to the control section 85.
The off-hook detection circuit 84 includes a resistor 93 having one terminal connected to the telephone line connecting terminal L1, a resistor 94 having one terminal connected to the telephone line connecting terminal L1, and one terminal connected to the other terminal of the resistor 94. And a resistor 95 whose other terminal is connected to the telephone line connecting terminal L2, and a constant voltage diode 96 whose anode is connected to the other terminal of the resistor 93 and whose cathode is connected to the telephone line connecting terminal L2. An inverting input terminal is connected to an intermediate connection point between the resistors 94 and 95, an inverting input terminal is connected to an intermediate connection point between the resistor 93 and the constant voltage diode 96, and a differential amplifier 97 that outputs an off-hook detection signal SOF, Equipped with a telephone line connection terminal L1
An intermediate connection point between the resistor 93 and the resistor 93 is connected to the telephone connection terminal T1, and an intermediate connection point between the telephone line connection terminal L2 and the cathode of the constant voltage diode is connected to the telephone connection terminal T2.

Here, the general operation of the off-hook detection circuit 84 will be described. A predetermined DC voltage is supplied to the telephone line connection terminals L1 and L2 when the telephone 82 connected to the telephone connection terminals T1 and T2 is not in the off-hook state. As a result, a predetermined DC voltage supplied via the resistor 93 is applied to the constant voltage diode 96, and a constant voltage is generated between both terminals thereof.
This constant voltage is input to the non-inverting input terminal of the differential amplifier 97.

On the other hand, a predetermined DC voltage is divided by resistors 94 and 95, and the divided voltage is differential amplifier 97.
Is input to the inverting input terminal. In this case, the resistance values of the resistors 94 and 95 are set so that the constant voltage generated by the constant voltage diode 96 becomes lower than the divided voltage by the resistors 94 and 95.

When the telephone 82 goes off-hook, the telephone connection terminal T1 and the telephone connection terminal T2 are connected to each other.
A current flows due to a predetermined DC voltage applied to the telephone line connecting terminals L1 and L2, the voltage of the telephone line connecting terminals L1 and L2 decreases, and the resistors 94 and 95 are brought into conduction.
The voltage divided by the voltage applied to the inverting input terminal of the differential amplifier 97 becomes lower than the constant voltage generated by the constant voltage diode 96.

As a result, the differential amplifier 97 outputs the off-hook detection signal SOF indicating the off-hook state to the control unit 85.

[0010]

As described above, in the above-mentioned conventional terminal network control device, detection of a ringing signal input from the telephone line and detection of whether the connected telephone is off-hook or not. Therefore, since it is necessary to provide both the ringing signal detection circuit and the off-hook detection circuit, there is a problem that the circuit becomes large-scaled, the circuit becomes complicated, and the cost also rises.

The present invention relates to a terminal network control device and a terminal network control method capable of surely detecting a calling signal and an off-hook state, reducing the circuit scale, simplifying the circuit configuration, and reducing the cost. .

[0012]

In order to solve the above-mentioned problems, the invention according to claim 1 proposes at least one set of telephone line connection terminals to which a telephone line 1 is connected, as shown in the basic configuration diagram of FIG. In the terminal network control device 3 having L1 and L2 and at least one set of telephone connection terminals T1 and T2 to which the telephone 2 is connected, the pair of telephone connection terminals T1 and T2.
Signal detection means 5 for detecting the voltage transition of the signal 4 between terminals, which is a signal between terminals, a frequency detection means 6 for detecting the frequency of the signal 4 between terminals, a detection state of the voltage transition and a detection state of the frequency. And a discrimination means 7 for discriminating whether or not there is a ringing signal inputted from the telephone line 1 through the paired telephone line connection terminals L1 and L2 and whether or not the telephone 2 is off-hook. To do.

According to the first aspect of the present invention, the signal transition detecting means 5 detects the voltage transition of the inter-terminal signal 4 which is a signal between the pair of telephone connection terminals T1 and T2, and the frequency detecting means 6 is provided. Detects the frequency of the signal 4 between terminals. Based on these, the discriminating means 7 determines whether or not there is a ringing signal inputted from the telephone line 1 through the paired telephone line connecting terminals L1 and L2 based on the detected state of the voltage transition and the detected state of the frequency and the telephone 2 is off-hook. It is determined whether it is in the state.

According to a second aspect of the present invention, in the first aspect of the invention, the discriminating means 7 compares the frequency of the high frequency component of the inter-terminal signal 4 with the frequency of the preset high frequency component of the calling reference signal. , And a calling signal frequency determining means for determining whether or not the calling signal is included in the inter-terminal signal 4.

According to the second aspect of the invention, in addition to the operation of the first aspect of the invention, the ringing signal frequency discriminating means of the discriminating means 7 is preset with the frequency of the high frequency component of the inter-terminal signal 4. The frequency of the high frequency component of the calling reference signal is compared to determine whether the calling signal is included in the inter-terminal signal 4.

According to a third aspect of the present invention, in the first or second aspect of the invention, the discriminating means 7 is a signal 4 between terminals.
Of the high frequency component of the ringing reference signal and a predetermined high frequency component of the ringing reference signal are compared with each other to determine whether or not the ringing signal is included in the inter-terminal signal 4. Be prepared and configured.

According to the third aspect of the invention, in addition to the operation of the first or second aspect of the invention, the ringing signal cycle discriminating means of the discriminating means 7 has the appearance period of the high frequency component of the inter-terminal signal 4. And the preset appearance frequency of the high frequency component of the calling reference signal are compared with each other to determine whether or not the inter-terminal signal 4 includes the calling signal.

According to a fourth aspect of the invention, in the invention according to any one of the first to third aspects, the discriminating means 7 is
An off-hook signal discriminating means for comparing the voltage transition state of the inter-terminal signal 4 with the voltage transition state of the preset off-hook reference signal and discriminating whether or not the off-hook signal is included in the inter-terminal signal 4 is provided. Configure.

According to the invention described in claim 4, in addition to the operation of the invention described in any one of claims 1 to 3, the off-hook signal judging means of the judging means 7 makes the voltage transition of the signal 4 between terminals. The state is compared with a preset voltage transition state of the off-hook reference signal to determine whether the inter-terminal signal 4 includes the off-hook signal.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a pair of telephone connections is formed as a part of a closed circuit for flowing the AC component of the terminal signal 4. The capacity between the telephone connection terminals T1 and T2 of the telephone 2 connected to the terminals T1 and T2 is used.

According to the invention described in claim 5, in addition to the operation of the invention described in any one of claims 1 to 4, the telephone set 2 connected to the pair of telephone connection terminals T1 and T2 has. Using the capacitance between the telephone connection terminals T1 and T2, the AC component of the inter-terminal signal 4 is passed. The invention according to claim 6 is the invention according to any one of claims 1 to 5,
A capacitor for flowing the AC component of the inter-terminal signal 4 is provided between the telephone connection terminals T1 and T2 forming a pair.

According to the invention described in claim 6, in addition to the operation of the invention described in any one of claims 1 to 5, a capacitor provided between the pair of telephone connection terminals T1 and T2 is used to connect the terminals. The AC component of signal 4 is passed. The invention according to claim 7 is a terminal network having at least one set of telephone line connection terminals L1 and L2 to which the telephone line 1 is connected, and at least one set of telephone connection terminals T1 and T2 to which the telephone set 2 is connected. In the terminal network control method for controlling the control device 3, a signal transition detecting step of detecting a voltage transition of an inter-terminal signal 4 which is a signal between a pair of telephone connection terminals T1 and T2, and a frequency of the inter-terminal signal 4 And a presence or absence of a ringing signal inputted from the telephone line 1 through the telephone line connecting terminals L1 and L2 forming a pair based on the detected state of the voltage transition and the detected state of the frequency, and the telephone set. A determination step of determining whether or not is in an off-hook state.

According to the seventh aspect of the present invention, the signal transition detecting step detects the voltage transition of the inter-terminal signal 4 which is a signal between the pair of telephone connection terminals T1 and T2, and the frequency detecting step comprises: The frequency of the signal 4 between terminals is detected. Based on these, the determining step is based on the detected state of the voltage transition and the detected state of the frequency, the presence or absence of a ringing signal inputted from the telephone line 1 through the pair of telephone line connecting terminals L1 and L2, and the telephone set being off-hook. It is determined whether it is in the state.

According to an eighth aspect of the invention, in the invention of the seventh aspect, the determining step compares the frequency of the inter-terminal signal 4 with the frequency of a preset calling reference signal, And a calling signal determination step of determining whether or not the calling signal is included.

According to the invention described in claim 8, in addition to the operation of the invention described in claim 7, in the ringing signal judging step of the judging step, the frequency of the inter-terminal signal 4 and the frequency of the preset calling reference signal are set. Are compared with each other to determine whether or not the calling signal is included in the inter-terminal signal 4.

According to a ninth aspect of the present invention, in the invention of the seventh or eighth aspect, the determining step includes the appearance period of the high frequency component of the inter-terminal signal 4 and the preset high frequency component of the calling reference signal. It comprises a calling signal cycle judging step of comparing the appearance cycle and judging whether or not the calling signal is included in the inter-terminal signal 4.

According to the ninth aspect of the invention, in addition to the operation of the seventh or eighth aspect of the invention, the ringing signal cycle determination step of the determination step includes the appearance cycle of the high frequency component of the inter-terminal signal 4. And the preset appearance frequency of the high frequency component of the calling reference signal are compared with each other to determine whether or not the inter-terminal signal 4 includes the calling signal.

According to a tenth aspect of the present invention, in the invention according to any one of the seventh to ninth aspects, the determining step includes the voltage transition state of the inter-terminal signal 4 and the voltage of the preset off-hook reference signal. An off-hook signal determination step of determining whether or not an off-hook signal is included in the inter-terminal signal 4 by comparing with a transition state is provided.

According to the tenth aspect, the seventh aspect is provided.
In addition to the effects of the invention described in any one of claims 9 to 9,
In the off-hook signal determining step of the determining step, the voltage transition state of the inter-terminal signal 4 is compared with the voltage transition state of the preset off-hook reference signal to determine whether the inter-terminal signal 4 includes the off-hook signal. To determine.

[0030]

Preferred embodiments of the present invention will now be described with reference to the drawings. The first embodiment terminal network control device 10 is roughly divided into telephone line connection terminals L1 and L2 connected to a telephone line 11, telephone connection terminals T1 and T2 to which a telephone 12 is connected, and a telephone line connection terminal L1. It is connected between the telephone connection terminal T2 and the telephone line 1
1. An off-hook call signal detection circuit 13 which outputs a detection signal Sdt corresponding to a call signal input from 1 and a state of the telephone 12 (off-hook state / on-hook state), and a call signal based on the detection signal Sdt Data through the control unit (MPU) 14 that controls the entire terminal network control device 10 and the center device side (not shown) and the telephone line 11 while functioning as a determination unit that determines whether or not there is a presence or absence and whether it is in an off-hook state. A data transmission / reception section 15 for transmission / reception, and a switching control signal SWC from the control section 14.
Based on the telephone connection terminal T1 or the data transceiver 1
5, a first changeover switch SW1 for connecting one input / output terminal 5 to the telephone line connection terminal L2, and the other input / output of the telephone connection terminal T2 or the data transmission / reception section 15 based on the changeover control signal SWC from the control section 14. Second changeover switch S for connecting either one of the terminals and the telephone connection terminal T2
W2.

The off-hook ringing signal detection circuit 13 includes a resistor 25 having one terminal connected to the telephone line connection terminal L1.
And the photocoupler 16 having the first input terminal t1 connected to the other terminal of the resistor 25 and the output terminal to connected to the control unit 14, and one terminal connected to the telephone line connection terminal L1 and the other terminal. Is the second input terminal t2 of the photocoupler 16.
The second input terminal t2 of the photocoupler 16 whose anode is connected to the resistor 17 connected to the telephone line connection terminal L1
A first constant voltage diode 18 having a cathode connected to
A second constant voltage diode 19 having a cathode connected to the telephone line connection terminal L1 and an anode connected to the second input terminal t2 of the photocoupler 16, and one terminal connected to the telephone line connection terminal L1 and the other terminal Is connected to the second input terminal t2 of the photocoupler 16, and the second input terminal t2 of the photocoupler 16 is connected to the telephone connection terminal T2.

The photocoupler 16 includes a first photodiode 21 having a cathode connected to the first input terminal t1 and an anode connected to the second input terminal t2, and the first input terminal t.
The second photodiode 22 having the anode connected to 1 and the cathode connected to the second input terminal t2, and the collector terminal connected to the high-potential-side power supply, and the low-potential-side power supply and control unit 14 via the output terminal to. And a phototransistor 23 having an emitter terminal connected thereto.

Next, the operation will be described with reference to FIGS. FIG. 3 shows an equivalent circuit when a call signal is detected. Telephone 1
When 2 is in the on-hook state, the telephone 12 can be regarded as the capacitance CTEL that allows the AC component signal to pass, as viewed from the off-hook ringing signal detection circuit 13.

When a call signal is input from the telephone line through the telephone line connecting terminals L1 and L2, a 16 Hz signal (AC component signal) from the telephone line 11 lasts for 1 second and is separated by 2 seconds. A repeated voltage waveform will appear (see FIG. 4A). In this case, the capacity C
The direct current component is cut by TEL to form an alternating current loop, and a resistor 25, a resistor 17, a first constant voltage diode 18, a second constant voltage diode 19, a capacitor 20, a first photodiode 21, a second photodiode 22 and a capacitor C are formed.
It flows through TEL and makes one of the first photodiode 21 and the second photodiode 22 emit light.

As a result, the light emitted from the first photodiode 21 and the second photodiode 22 is received by the phototransistor 23, and the phototransistor 23 outputs the detection signal Sdt shown in FIG. Becomes As a result, the control unit 14 causes the A / D (not shown)
The detection signal Sdt is analog-to-digital converted by the converter circuit and taken in, and the second threshold value VTH2 (see FIG.
In the detection data SDdt2 (see FIG. 4D) obtained by comparison with (a)), 1) whether there is a portion corresponding to the 16 Hz signal. 2) If there is a portion corresponding to the 16 Hz signal, whether the portion corresponding to the 16 Hz signal appears in the same cycle as the calling signal. When there is no portion corresponding to the 16 Hz signal or there is a portion corresponding to the 16 Hz signal, but when the portion corresponding to the 16 Hz signal appears at a cycle different from the calling signal (including the appearance only once), the calling is performed. Processing is performed assuming that no signal exists.

On the contrary, if the 16 Hz signal-corresponding portion exists and the 16 Hz signal-corresponding portion appears at the same cycle as the calling signal, the control unit 14 performs the processing as if the calling signal exists. Becomes Note that, simply, it is possible not to monitor the appearance period but to perform the process as if the calling signal exists when the portion corresponding to the 16 Hz signal is detected for a predetermined time or longer.

FIG. 5 shows an equivalent circuit when an off-hook state is detected. When the telephone 12 is in the off-hook state, the telephone connection terminal T is seen from the off-hook ringing signal detection circuit 13.
It can be considered that 1 and the telephone connection terminal T2 are short-circuited.

In this case, as shown in FIG.
If the telephone 12 goes off-hook at the time TM, the telephone line connecting terminals L1 and L2 are connected via the telephone line 11.
A current flows through the first photodiode 21 or the second photodiode 22 by a predetermined DC voltage applied between them, and either photodiode emits light, and the light emitted from this photodiode is received by the phototransistor 16. As shown in FIG. 4B, the detection data SDdt1 (see FIG. 4B) obtained by comparing the detection signal Sdt with the first threshold value VTH1 (see FIG. 4A) is at “H” level. Become.

As a result, the control unit 14 controls the A / (not shown).
The detection signal Sdt is analog-to-digital converted by the D converter circuit and taken in, and it is determined whether or not the "H" level has continued for a predetermined time or longer in the obtained detection data SDdt1, and the "H" level If it continues for a predetermined time (3 seconds in the following description) or more, it is determined to be in the off-hook state and the corresponding process is performed.

Next, the overall outline operation of the terminal network control apparatus of the first embodiment will be described with reference to the operation processing flowchart of FIG. In this case, it is assumed that in the initial state, the first changeover switch SW1 and the second changeover switch SW2 are connected to the telephone connection terminals T1 and T2.

First, the control unit 14 determines whether or not a situation has occurred in which an external center device (not shown) should be notified via the telephone line 11 (step S1). Control unit 1
No. 4 is in a standby state when there is no situation to report (step S1; No).

Next, the control section 14 determines whether or not the voltage Vs of the detection signal Sdt is higher than the first threshold value VTH1 based on the detection data SDdt1 (step S2). When the voltage Vs of the detection signal Sdt is equal to or lower than the first threshold value VTH1 (step S2; No), neither the off-hook state nor the ringing signal receiving state is set, and the control unit 14 performs the switching control as shown in FIG. First changeover switch S by signal SWC
W1 and the second changeover switch SW2 are connected to the data transmitting / receiving unit 15
Then, the data transmission / reception unit 15 performs a notification process to the center device (not shown) via the telephone line 11 (step S11), and the process is terminated.

The voltage Vs of the detection signal Sdt is the first threshold value VTH1.
If it is higher (step S2; Yes), there is a possibility of being in the off-hook state or the ringing signal receiving state, so the built-in timer (counting 3 seconds) is started (step S3). Here, the timer is set to 3 seconds because the appearance period of the portion corresponding to 16 Hz of the calling signal is 3
Seconds.

Next, the control unit 14 determines whether or not 3 seconds have elapsed according to the value of the timer (step S4), and stands by until 3 seconds have elapsed. When 3 seconds has elapsed according to the value of the timer, it is determined again based on the detection data Sdt1 whether the voltage Vs of the detection signal Sdt is higher than the first threshold value VTH1 (step S5). This is because the voltage Vs of the detection signal Sdt should be higher than the first threshold value VTH1 for 3 seconds or more when the off-hook state or the ringing signal reception state is supported.

The voltage Vs of the detection signal Sdt is the first threshold value VTH1.
When it is the following (step S5; No), the control unit 1
4 is considered to be caused by erroneous detection of noise or the like in step S2, and as shown in FIG. 7, the first control switch SW1 and the second control switch SW2 are switched to the data transmitting / receiving section 15 side by the control signal SWC. Then, the data transmission / reception unit 15 performs a notification process to the center device (not shown) via the telephone line 11 (step S1).
1), end the process.

The voltage Vs of the detection signal Sdt is the first threshold value VTH1.
If it is higher (step S5; Yes), it is necessary to determine whether it is in the off-hook state or the ringing signal receiving state, so the control unit 14 determines the detection data SD.
Based on dt2, the voltage Vs of the detection signal Sdt is the second threshold VT
It is determined whether it is higher than H2 (step S6).

The voltage Vs of the detection signal Sdt is the second threshold value VTH2.
In the case of the following (step S6; No), it is determined that the off-hook state is set, a process associated with the off-hook state is performed (step S10), and the process ends. If the voltage Vs of the detection signal Sdt is higher than the second threshold value VTH2 (step S6; Yes), there is a possibility of being in the ringing signal reception state. Therefore, the control unit 14 determines that the portion corresponding to 16 Hz is based on the detection data Sdt2. It is determined whether or not it exists (step S7).

When the control section 14 determines that the portion corresponding to 16 Hz does not exist (step S7; No), the determination in step S6 is considered to be due to erroneous detection of noise or the like, and as shown in FIG. The first control switch SW1 and the second control switch SW2 according to the control signal SWC.
To the data transmitter / receiver 15 side, and the data transmitter / receiver 15
Then, the center device (not shown) is notified via the telephone line 11 (step S11), and the process ends.

When the control unit 14 determines that there is a portion corresponding to 16 Hz (step S7; Yes), the process shown in FIG.
As shown in (d), a reference paging signal reception pattern that is preset as to whether or not the appearance period of the portion corresponding to 16 Hz is a predetermined period, that is, whether the portion corresponding to 16 Hz appears every 3 seconds and continues for 1 second. It is determined by comparing with (step S8).

When the appearance cycle of the portion corresponding to 16 Hz is not the predetermined cycle (step S8; No), step S7
It is considered that the discrimination in step 1 is due to erroneous detection of noise or the like, and as shown in FIG.
The changeover switch SW1 and the second changeover switch SW2 are changed over to the data transmission / reception section 15 side, and the data transmission / reception section 15 performs a notification process to a center device (not shown) through the telephone line 11 (step S11), and the process is terminated. .

When the control unit 14 determines that the appearance period of the portion corresponding to 16 Hz has a predetermined period (step S7; Yes), the control unit 14 determines that the call signal is being received,
Perform processing associated with the ringing signal reception state (step S
9), end the processing. As described above, according to the first embodiment, one off-hook ringing signal detection circuit
It is possible to reliably determine the off-hook state and the ringing signal reception state. Further, as compared with the conventional case where both the ringing signal detection unit and the off-hook detection circuit are provided, the circuit configuration is easy, the circuit scale can be reduced, and the cost can be reduced. Second Embodiment In the first embodiment, when a ringing signal is detected,
The capacity CTEL, which is the capacity of the telephone 12, was used as a part of the closed circuit that flows the ringing signal that is an AC component signal. This capacity CTEL is the configuration of the telephone 12 (circuit configuration, etc.).
Therefore, if this value is too small, the desired AC component signal does not always flow.

Therefore, in the second embodiment, as shown in FIG. 8, a capacitor C is provided between the telephone connection terminals T1 and T2, and when the actual call signal is detected, it is replaced with CTEL in the first embodiment. The same processing is performed using CTEL1 which can be expressed by the following equation. CTEL1 = CTEL '+ C As a result, even if the capacity CTEL' of the telephone 12 is small, a closed circuit for flowing the ringing signal, which is an AC component signal, can be surely constructed, and the ringing signal can be reliably detected. it can.

[0053]

According to the first aspect of the present invention, the signal transition detecting means detects the voltage transition of the inter-terminal signal which is a signal between the telephone connection terminals forming a pair, and the frequency detecting means uses the inter-terminal signal. The frequency of the signal is detected, and the determination means determines whether or not there is a ringing signal input from the telephone line through the paired telephone line connection terminal based on the detected state of the voltage transition and the detected state of the frequency, and the telephone is in the off-hook state. Therefore, it is possible to reliably determine the off-hook state and the ringing signal receiving state. Further, since the same discriminating means determines whether or not there is a ringing signal and whether or not the telephone is in the off-hook state, the circuit can be shared and the circuit scale can be reduced.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the calling signal frequency judging means of the judging means has a frequency of the high frequency component of the signal between terminals and a preset calling reference. Compare the frequency of the high frequency component of the signal,
Since it is determined whether or not the call signal is included in the signal between terminals, it is possible to reliably determine the call signal reception state without being affected by noise components and the like.

According to the third aspect of the invention, in addition to the effect of the first or second aspect of the invention, the ringing signal cycle determining means of the determining means has the appearance cycle of the high frequency component of the inter-terminal signal and the advance cycle. By comparing the appearance cycle of the high frequency component of the set calling reference signal and determining whether the calling signal is included in the signal between the terminals, the calling signal can be reliably received without being affected by noise components and the like. The reception status can be determined.

According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, the off-hook signal judging means of the judging means determines that the voltage transition state of the signal between terminals is Since the voltage transition state of the preset off-hook reference signal is compared and it is determined whether or not the off-hook signal is included in the inter-terminal signals, the off-hook state can be reliably detected.

According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1 to 4, between the telephone connection terminals of the telephone set connected to the telephone connection terminals forming a pair. Since the AC component of the signal between the terminals is made to flow by using the capacitance of, the ringing signal reception state can be reliably detected with a simple configuration.

According to the invention described in claim 6, in addition to the effect of the invention described in any one of claims 1 to 5, an AC signal between terminals is exchanged by a capacitor provided between a pair of telephone connection terminals. Since the components are flown, the ringing signal reception state can be reliably detected without being affected by the change in the capacity between the telephone connection terminals of the telephone.

According to the seventh aspect of the invention, the signal transition detecting step detects a voltage transition of the inter-terminal signal which is a signal between the telephone connection terminals forming a pair, and the frequency detecting step detects the inter-terminal signal. The frequency is detected, and the determining step includes the presence or absence of a ringing signal input from a telephone line through a pair of telephone line connection terminals based on the detected state of the voltage transition and the detected state of the frequency, and the telephone is in an off-hook state. Therefore, it is possible to reliably determine the off-hook state and the ringing signal receiving state.

According to the invention described in claim 8, in addition to the effect of the invention described in claim 7, in the ringing signal judging step of the judging step, the frequency of the inter-terminal signal and the frequency of the preset calling reference signal are compared. Since it is determined whether or not the ringing signal is included in the inter-terminal signals, it is possible to reliably determine the ringing signal reception state without being affected by noise components and the like.

According to the invention of claim 9, in addition to the effect of the invention of claim 7 or claim 8, the ringing signal cycle determination step of the determination step is the appearance cycle of the high frequency component of the signal between terminals. By comparing the appearance frequency of the high frequency component of the preset calling reference signal and determining whether the ringing signal is included in the signal between the terminals, it is possible to reliably call without being affected by noise components etc. It is possible to determine the signal reception state.

According to the invention of claim 10, claim 7 is provided.
In addition to the effects of the invention according to any one of claims 9 to 9,
The off-hook signal determining step of the determining step compares the voltage transition state of the inter-terminal signal with the voltage transition state of the preset off-hook reference signal to determine whether the inter-terminal signal 4 includes the off-hook signal. Therefore, the off-hook state can be reliably detected.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 is a schematic configuration block diagram of a terminal network control device of the first embodiment.

FIG. 3 is an equivalent circuit diagram in an on-hook state.

FIG. 4 is an operation explanatory diagram of the first embodiment.

FIG. 5 is an equivalent circuit diagram in an off-hook state.

FIG. 6 is an operation processing flowchart of the first embodiment.

FIG. 7 is an explanatory diagram of a connection state in a notification state.

FIG. 8 is a schematic configuration block diagram of a terminal network control device of a second embodiment.

FIG. 9 is a schematic block diagram of a conventional terminal network control device.

FIG. 10 is a circuit configuration diagram of a conventional call signal detection unit and an off-hook detection circuit.

[Explanation of symbols]

 1 telephone line 2 telephone 3 terminal network control device 4 signal between terminals 5 signal transition detection means 6 frequency detection means 7 discrimination means 10 terminal control device 11 telephone line 12 telephone 13 off-hook ringing signal detection circuit 14 control unit (MPU) 15 data transmission / reception Part L1, L2 telephone line connection terminal Sdt detection signal SW1 first changeover switch SWC changeover control signal SW2 second changeover switch T1, T2 telephone connection terminal to output terminal

Claims (10)

[Claims] 1. A terminal network control device having at least one set of telephone line connection terminals to which a telephone line is connected, and at least one set of telephone connection terminals to which a telephone is connected, said pair of telephone connection terminals being a pair. Signal transition detection means for detecting the voltage transition of the signal between terminals which is a signal between, and frequency detection means for detecting the frequency of the signal between terminals, based on the detection state of the voltage transition and the detection state of the frequency A terminal network, comprising: a determination unit that determines whether or not a call signal is input from the telephone line through the pair of telephone line connection terminals and whether or not the telephone is in an off-hook state. Control device. 2. The terminal network control device according to claim 1, wherein the discrimination means compares the frequency of the high frequency component of the inter-terminal signal with the frequency of the preset high frequency component of the calling reference signal, and determines the terminal. A terminal network control device comprising a calling signal frequency determining means for determining whether or not the calling signal is included in the inter-signal. 3. The terminal network control device according to claim 1 or 2, wherein the determining unit determines the appearance cycle of the high frequency component of the inter-terminal signal and the appearance cycle of the preset high frequency component of the calling reference signal. And a calling signal cycle judging means for judging whether or not the calling signal is included in the inter-terminal signals. 4. The terminal network control device according to claim 1, wherein the determining unit determines a voltage transition state of the inter-terminal signal and a voltage transition state of a preset off-hook reference signal. And an off-hook signal discriminating means for discriminating whether or not an off-hook signal is included in the DC component signal. 5. The terminal network control device according to any one of claims 1 to 4, wherein the terminal network control device is connected to a pair of telephone connection terminals as a part of a closed circuit for flowing an AC component of the terminal signal. A terminal network control device, characterized in that the capacity between the telephone connection terminals of the telephone set is used. 6. The terminal network control device according to claim 1, wherein a capacitor for flowing an AC component of the signal between the terminals is provided between the telephone connection terminals forming the pair. Characteristic terminal network control device. 7. A terminal network control method for controlling a terminal network control device having at least one set of telephone line connection terminals to which a telephone line is connected, and at least one set of telephone connection terminals to which a telephone is connected. A signal transition detecting step of detecting a voltage transition of an inter-terminal signal which is a signal between the pair of telephone connection terminals, a frequency detecting step of detecting a frequency of the inter-terminal signal, a detection state of the voltage transition, and A determination step of determining, based on the detected state of the frequency, whether or not there is a ringing signal input from the telephone line through the pair of telephone line connection terminals and whether or not the telephone is in an off-hook state. A terminal network control method characterized by the above. 8. The terminal network control method according to claim 7, wherein the determining step compares the frequency of the inter-terminal signal with the frequency of a preset call reference signal, and calls the call in the AC component signal. A method for controlling a terminal network, comprising a paging signal determination step of determining whether or not a signal is included. 9. The terminal network control method according to claim 7 or 8, wherein the determining step includes an appearance cycle of a high frequency component of the inter-terminal signal and an appearance cycle of a high frequency component of a preset calling reference signal. And a calling signal cycle determining step of determining whether or not the calling signal is included in the inter-terminal signals. 10. The terminal network control method according to claim 7, wherein the determination step includes a voltage transition state of the inter-terminal signal and a voltage transition state of a preset off-hook reference signal. And an off-hook signal determining step of determining whether or not the inter-terminal signal includes an off-hook signal.