JP3748542B2 - Communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication apparatus for detecting a hook state of the second communication means in a facsimile apparatus or a data communication apparatus that can be used by connecting a second communication means such as a telephone.
[0002]
[Prior art]
FIG. 6 is a diagram showing a conventional communication device 600.
[0003]
In the conventional communication apparatus 600, communication means CS61 and CS62 are connected to one analog public line (PSTN), and a telephone as the second communication means CS62 is connected to the facsimile apparatus as the first communication means CS61. This is a conventional example to be used.
[0004]
In the conventional communication apparatus 600, a line is connected to the terminals L1 and L2, and a telephone is connected to the terminals T1 and T2. The first communication means CS61 has a modem 64 (facsimile modem or data communication modem) and performs communication.
[0005]
Then, a CML relay 61 as a first switch means is provided, and the line is connected to the telephone side or connected to the modem 64 side of the first communication means CS61, and either the telephone or the modem 64 of the first communication means is connected. Can be used.
[0006]
That is, if the CML relay 61 is off, the line is connected to the telephone, and if it is on, the line is connected to the modem 64, and either the telephone or the modem 64 can operate.
[0007]
The transformer 63 transmits an analog signal for communication. The DC switching unit 62 recognizes that the communication device is connected to the line by passing a direct current through the telephone line.
[0008]
When the CML relay 61 is connected to the ON side, the line is connected to the transformer 63 and the direct current capturing unit 62 of the first communication means CS61, so that the facsimile apparatus as the first communication means communicates with the modem 64. Is possible.
[0009]
In this case, since there is only one line, only one of the facsimile apparatus and the telephone can be used. Therefore, the facsimile apparatus always monitors the line use state (on-hook / off-hook state) of the telephone. There is a need.
[0010]
When detecting the hook state of the telephone, the current that flows when the telephone is off-hook is supplied to the HOOK detector 66, and the hook of the telephone is detected by the HOOK signal output from the HOOK detector 66.
[0011]
The HOOK detector 66 includes a current sensor using a photocoupler or a Hall element, a current detection relay, or the like.
[0012]
That is, a line DC voltage or a DC power supply 67 inside the facsimile apparatus is applied to the connection portion of the telephone set as the second communication means CS62 through the facsimile apparatus as the conventional communication apparatus 600. When the telephone is on-hook, no current flows, so the HOOK detector 66 does not output a HOOK signal. On the other hand, if the telephone is off-hook, an appropriate current flows and the HOOK detector 66 outputs a HOOK signal. Therefore, the facsimile apparatus which is the conventional communication apparatus 600 can detect the hook state of the telephone which is the second communication means CS62.
[0013]
The HOOK detector 66 normally determines that an off-hook has been detected when a direct current of 5 to 10 mA flows.
[0014]
On the other hand, when the second switch (H relay 65) is provided inside the facsimile machine and the telephone is switched to either the line side or the DC power supply 67 inside the facsimile machine, the following operation is realized. Can do.
[0015]
When the first switch (CML relay 61) is connected to the telephone side (off side) and the second switch (H relay 65) is connected to the line side (off side), the telephone is ready for use. Further, it is possible to detect a hook due to a line DC voltage. That is, it is possible to detect a standby state and a hook state in a telephone use state.
[0016]
Regardless of the connection direction of the first switch (CML relay 61), when the second switch (H relay 65) is connected to the DC power supply 67 side (ON side) inside the facsimile apparatus, the DC power supply inside the facsimile apparatus 67 makes it possible to detect telephone hooks. Accordingly, it is possible to detect a telephone hook not only when the facsimile apparatus is in a standby state but also when the facsimile apparatus is in an operating state.
[0017]
Further, when a ringing signal arrives from the line in the standby state, when the second switch (H relay 65) is connected to the line side, the ringing signal reaches the telephone, the telephone rings, When the second switch (H relay 65) is connected to the DC power supply 67 side inside the facsimile apparatus, the calling signal does not reach the telephone and the telephone does not ring.
[0018]
Either of these can be selected by controlling or setting the facsimile apparatus.
[0019]
Japanese Patent Application Laid-Open No. 1-129649 provides an application means for applying a line voltage to a detection means for detecting the state of the communication means, and the detection means is connected based on the voltage applied by the application means. It is described to detect the state of the means.
[0020]
Japanese Patent No. 3055343 discloses a facsimile apparatus that is provided with invalid means for invalidating a ringing signal for ringing a slave telephone by a unidirectional element and that can detect the hook state of the slave telephone.
[0021]
[Problems to be solved by the invention]
In the above-described conventional example, when a DC power source of a facsimile apparatus, which is the conventional communication apparatus 600, is applied to the connection portion of the telephone, which is the second communication means CS62, a secondary DC power source included in the conventional communication apparatus 600. , The DC power source needs to be insulated from other secondary circuits of the conventional communication device 600. Providing this insulating and separating circuit is expensive and uses a large space, There is also a problem that extra power consumption is required.
[0022]
Further, in the above conventional example, the internal noise of the conventional communication device 600 is likely to appear on the second communication means CS62 and the line, and it is necessary to provide a noise countermeasure circuit in order to suppress this noise, and a noise countermeasure circuit is provided. There is a problem that it is expensive and space for the noise countermeasure circuit is required.
[0023]
Further, in the above conventional example, when using the telephone as the second communication means CS62, the HOOK detector needs to satisfy the line standard for use of the telephone in order to guarantee the operation. That is, between the line connection part of the conventional communication apparatus 600 and the connection part of the telephone set as the second communication means CS62, that is, between the terminals L1, L2 and T1, T2 in the conventional communication apparatus 600 It is necessary to satisfy standards such as “insertion loss” which is a standard for suppressing signal loss in a band and “series DC resistance” which is a standard for suppressing resistance value.
[0024]
However, when it is necessary to detect the off-hook of the telephone as the second communication means CS62 with a current value smaller than the above 5 to 10 mA, even if the HOOK detector is configured as such, it satisfies the above standards at the same time. There is a problem that it is difficult.
[0025]
Further, in the conventional method described in JP-A-1-129649, there is only one means for detecting the state of the calling means. In this case, only one type of detection sensitivity can be realized, Depending on the line voltage state, it may not be detected. For example, when a line relay (cml) is connected to the modem unit 1, the line current flows to the modem unit 1, but at the same time, the h relay is turned on to detect the state of the telephone set 2, particularly off-hook. In this case, if the direct current impedance of the telephone 2 is higher than the direct current impedance of the modem unit 1, the direct current flowing to the telephone 2 side becomes small and smaller than the current required for the off-hook state detection means of the telephone 2, thereby There is a problem that the off-hook of the telephone 2 cannot be detected.
[0026]
Further, in the above conventional method, there is no means for preventing the phone from ringing, and if the communication device is not in an operating state, the incoming call signal always reaches the phone, and even if it does not want to ring the phone, it rings. There's a problem.
[0027]
Further, in the conventional method described in Japanese Patent No. 3055343, one off-hook detection circuit is provided for each slave phone, and the above problem may occur in the same manner.
[0028]
Furthermore, in the above conventional example, in order to solve the above problem, the means for detecting the polarity of the telephone line and the polarity matching means for matching the polarity of the telephone line and the polarity of the slave telephone based on the detected polarity There is a problem that the number of internal circuits increases, which increases costs, increases circuit space, and increases power consumption.
[0029]
SUMMARY OF THE INVENTION An object of the present invention is to provide a communication device that can be used by connecting to an analog public line and that can be inexpensive and save space.
[0030]
[Means for Solving the Problems]
The present invention comprises a first communication means for communicating by connecting to a telephone line, and a connection means for connecting a second communication means for connecting to and communicating with the telephone line via the first communication means. In the communication device provided, the first communication means includes the first switch means for connecting the telephone line to the first communication means or the second communication means, and the second communication via the first switch means. A first route means for connecting the means to the telephone line; a second route means for directly connecting the second communication means to the telephone line; and the second communication means as a first route means or a second route means. Second switch means connected to the first route means, first hook detection means connected to the first route means, a telephone line of the second route means, and a second hook connected between the second switch means A communication device having detection means.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
[First embodiment]
FIG. 1 is a block diagram showing a communication apparatus 100 according to the first embodiment of the present invention.
[0032]
The communication device 100 includes a first communication unit CS11, and further includes, for example, a modular connector that is a connection unit for connecting the second communication unit CS12. The first communication unit CS11 is, for example, a communication unit that performs facsimile communication, and the second communication unit CS12 is a telephone.
[0033]
The communication device 100 is connected to an analog public line via two lines L1 and L2, and a telephone which is the second communication means CS12 is connected to the second communication means T2 and T2 which are connection means. It is connected.
[0034]
The facsimile apparatus as the communication apparatus 100 includes a CML relay 11, a first communication unit CS 11, an H relay 15, a first path unit 16, a second path unit 17, and HOOK detectors 18 and 19. The first communication means CS11 includes a direct current capturing unit 12, a transformer 13, and a modem 14.
[0035]
The CML relay 11 is an example of first switch means, and when connected to the off side, connects the line to the telephone side which is the second communication means CS12. When the CML relay 11 is connected to the ON side, the CML relay 11 is connected to the modem 14 (here, a facsimile modem) as the first communication means. That is, when the facsimile apparatus is not operating or when the telephone is in an operating state, the connection is made to the off side, and when the facsimile apparatus is in communication operation by the modem 14, the connection is made to the on side.
[0036]
The first route means 16 is a two-wire line that connects the line from L1 and L2 via the CML relay 11 to the telephone side.
[0037]
The transformer 13 transmits an analog signal for communication. The DC exchange recognizes that the communication device is connected to the line by causing the direct current capturing unit 12 to pass a direct current through the telephone line.
[0038]
When the CML relay 11 is connected to the ON side, the line is connected to the transformer 13 and the DC capturing unit 12 which are the first communication means CS11, so that the facsimile apparatus can communicate with the modem 14. .
[0039]
The H relay 15 is an example of the second switch means, and is connected between the CML relay 11 of the first route means 16 and the telephone, and the telephone is connected to either the first route means 16 or the second route means 17. Is a relay to connect.
[0040]
The second route means 17 is a route that branches from L1 and L2 connecting the lines and connects L1 and L2 and the H relay 15 by two lines. Therefore, when the H relay 15 is off and the CML relay 11 is off, the telephone is connected to the line via the first route means 16 and the H relay 15 is on. Regardless of the connection of the CML relay 11, the telephone can be connected to the line via the second route means 17.
[0041]
The first HOOK detector 18 is connected between the CML relay 11 and the H relay 15 of the first route means 16, and when the telephone is connected to the line via the first route means 16, the hook detection of the phone is detected. I do.
[0042]
The second HOOK detector 19 is connected between the branch point on the second route means 17 and the H relay 15, and when the telephone is connected to the line via the second route means 17, the hook detection of the phone is detected. I do.
[0043]
The first HOOK detector 18 and the second HOOK detector 19 are configured by a current sensor using a photocoupler, a Hall element, a current detection relay, and the like, and a HOOK1 signal output from the first HOOK detector 18 according to a flowing DC current, The level of the HOOK2 signal output from the second HOOK detector 19 is determined, and the CPU of the first communication means CS11 (not shown) looks at the level of the HOOK1 signal or the HOOK2 signal, so that the telephone is on-hook or off-hook. Determine whether.
[0044]
That is, when the telephone is in the on-hook state, no current flows through the first HOOK detector 18 and the second HOOK detector 19, so that the HOOK1 signal and the HOOK2 signal are at a low level, for example, while the telephone is in the off-hook state. At a certain time, a current flows through the first HOOK detector 18 and the second HOOK detector 19, and the HOOK1 signal and the HOOK2 signal are at a high level.
[0045]
The level of the HOOK1 signal and the HOOK2 signal changes when the phone is off-hooked from the on-hook state or when the phone is on-hooked from the off-hook state. In order to eliminate the delay of the hook, a hook state determination timer is provided.
[0046]
That is, when the HOOK1 signal or the HOOK2 signal changes from the low level to the high level, the timer is started. For example, if the high level continues for 500 ms, the telephone changes from the on-hook state to the off-hook state to decide.
[0047]
When the first HOOK detector 18 and the second HOOK detector 19 are photocouplers, a bidirectional photocoupler that does not limit the direction of the direct current is used. In the case of current sensors and current detection relays, there is no restriction on the direction of the direct current.
[0048]
Next, the operation of the above embodiment will be described.
[0049]
Since the CML relay 11 is connected to the off side in the standby state, the hook detection of the telephone can be performed regardless of whether the H relay 15 is connected to the off side or the on side. That is, when the H relay 15 is connected to the off side, the telephone is connected to the first path 16, and when the telephone is off-hook, a line that flows through the first path 16 Current flows into the first HOOK detector 18 and the HOOK1 signal goes to a high level, so that the telephone off-hook can be detected.
[0050]
Of course, since no current flows when the telephone is on-hook, the on-hook can be detected when the HOOK1 signal goes low. Further, when the H relay 15 is connected to the ON side, the telephone is connected to the second path 17, and when the telephone is off-hook, from the line flowing through the second path 17 Current flows into the second HOOK detector 19 and the HOOK2 signal becomes a high level, so that it is possible to detect the off-hook of the telephone.
[0051]
As described above, since no current flows when the telephone is on-hook, it is possible to detect on-hook when the HOOK2 signal goes low.
[0052]
Therefore, the DC power supply inside the apparatus, which was necessary in the conventional example, is not required in the above-described embodiment, and therefore a noise removal circuit that should remove noise generated by the DC power supply is not necessary in the above-described embodiment.
[0053]
When the telephone is off-hooked from the standby state, the CML relay 11 continues the off connection, and the H relay 15 continues the off connection or connects from the on to the off to connect the telephone to the first route means 16. By connecting to the line and connecting to the line, you can guarantee the trouble-free use (call) of the phone. At this time, when detecting the on-hook of the telephone, the first HOOK detector 18 detects the on-hook of the telephone.
[0054]
On the other hand, when the CML relay 11 is connected to the ON side and it is necessary to detect the hook of the telephone when the facsimile apparatus is operating in some way, the H relay 15 is always connected to the ON side and the telephone is connected to the second side. Connected to the path 17.
[0055]
For example, when a hook key is provided in the facsimile apparatus and the CML relay 11 is turned on when this hook key is pressed, or before the dialing operation is performed after the CML relay 11 is turned on in order for the facsimile apparatus to enter a dialing operation, In order to detect the CNG signal after the call signal arrives in the FAX / TEL switching mode, after the CML relay 11 is turned on, when a dial signal is sent from the facsimile apparatus with the telephone set off-hook, or when the CML relay 11 is turned on. When the hold sound or voice response signal is output from the modem 14, the H relay 15 is always connected to the ON side, and the telephone is connected to the second path 17.
[0056]
Therefore, when the telephone is off-hook, the off-hook of the telephone can be detected by flowing the current from the flowing line to the second HOOK detector 19 via the second path 17, and of course the telephone is on-hook. Since no current flows through the second HOOK detector 19, on-hook can be detected.
[0057]
Furthermore, there are the following cases as operations of the first embodiment.
[0058]
If the hook detection of the telephone is necessary when the CML relay 11 is on, the H relay 15 is turned on, the telephone is connected to the second route means 17, and hook detection is performed. When it is off-hook and affects the operation of the facsimile machine, the H relay 15 is turned off to disconnect the telephone from the second route means 17 and disconnect the telephone from the line. For example, when a telephone and a facsimile machine are connected in parallel to the line and the characteristics of the facsimile machine change, affecting its operation. For example, when the facsimile machine is communicating or sending a dial signal Then, the H relay 15 is turned off and the telephone is disconnected from the second route means 17.
[0059]
As described above, the first HOOK detector 18 and the second HOOK detector 19 respectively provided in the first route means 16 and the second route means 17 are further configured as follows.
[0060]
Since the first HOOK detector 18 exists on the first route means 16 to be connected when the telephone is in use, the first standard HOOK detector 18 satisfies the above-mentioned standards and guarantees the telephone specifications. The current value for detecting the off-hook is set to about 5 to 10 mA. Accordingly, since there is no influence on facsimile communication of the facsimile apparatus, dial transmission, etc., an inexpensive photocoupler or the like can be used as the first HOOK detector 18.
[0061]
On the other hand, when the second HOOK detector 19 needs to detect the hook of the telephone when the CML relay 11 is on, the second HOOK detector 19 connects the telephone to the second route means 17 as described above to connect the hook. Since it may be detected, it is configured as follows.
[0062]
That is, when the CML relay 11 is turned on, if the telephone is connected to the second route means 17 and the telephone is off-hooked, the DC capturing unit 12 of the facsimile apparatus and the telephone are connected in parallel. At this time, if the direct current impedance of the direct current capturing unit 12 is smaller than that of the telephone, the current flowing through the telephone becomes small. Even in this case, it is necessary to detect the hook. Therefore, the second HOOK detector 19 is configured to detect off-hook even when the current flowing through the telephone is small. Specifically, when a current of several hundred μA to 1 mA flows through the telephone, it is determined that the telephone is off-hook.
[0063]
Even if the second HOOK detector 19 is configured to detect the off-hook of the telephone with a small current, since the timer determination means is provided as described above, when the timer becomes full and the telephone is determined, Even if the capacitor inside is fully charged and the CML relay 11 is switched from on to off and the line is connected to the telephone, it is not erroneously detected that the central office switch is on-hook by disconnecting the line current.
[0064]
Since the second route means 17 is used when detecting the hook of the telephone, it is not necessary to satisfy the above standard when the telephone is connected to the second route means 17 including the second HOOK detector 19. A current off-hook detection current can be realized. Since the second HOOK detector 19 is connected so as not to affect the facsimile communication or dial transmission of the facsimile apparatus, an inexpensive photocoupler can be used.
[0065]
Here, the above-described various relays are controlled by a control means such as a CPU (not shown) of the facsimile apparatus.
[0066]
[Second Embodiment]
FIG. 2 is a block diagram showing a communication apparatus 200 according to the second embodiment of the present invention.
[0067]
The communication device 200 includes a first communication unit CS21, and further includes, for example, a modular connector that is a connection unit for connecting the second communication unit CS22. The first communication means CS21 is, for example, communication means for performing facsimile communication, and the second communication means CS22 is the same telephone as the second communication means CS12.
[0068]
Further, the second path means 17 of the communication device 200 has a current rectifier 20. The current rectifier 20 is provided on the second path means 17 and on the line side of the H relay 15.
[0069]
FIG. 3 is a circuit diagram illustrating an example of the current rectifier 20.
[0070]
As shown in FIG. 3, the current rectifier 20 uses four unidirectional elements (for example, diodes), and is connected to the anode and cathode connection terminals of the diode so that there is no polarity on the line side. Are connected to the anode connecting terminal (−) and the cathode connecting terminal (+) having polarity. In this way, a unidirectional DC current can be obtained on the H relay 15 side regardless of the polarity of the DC current from the line, and the HOOK detection by the second HOOK detector 19 can be realized without any problems. it can.
[0071]
In particular, since the second HOOK detector 19 is located closer to the H relay 15 than the current rectifier 20, the direction of the direct current of the line is constant, so that a one-way photocoupler can be used, and the two-way photocoupler. The cost can be reduced. Even in the case of a current sensor or a DC detection relay, there is no limitation on the direction of the DC current, but it can be used as the second HOOK detector 19 even when the direction of the DC current is limited.
[0072]
Further, when the H relay 15 is turned on and the telephone set as the second communication means CS22 is connected to the second route means 17 when the facsimile apparatus as the communication apparatus 200 is in a standby state, the normal frequency of 15 Hz to 60 Hz from the line is obtained. Even if a call signal with a negative voltage level arrives, it is rectified by the current rectifier 20 and becomes a half wave with only a positive voltage level, the call signal is invalidated, and the ringer inside the telephone does not ring. . That is, even if the DC power supply provided in the facsimile apparatus in the conventional example is not provided, it can be disabled without ringing the telephone in a state where it is connected to the line.
[0073]
On the other hand, when the H relay 15 is turned off and the telephone is connected to the first route means 16 in the standby state, the ringing signal coming from the line reaches the telephone as it is and the telephone rings without any problem.
[0074]
The connection of the H relay 15 in the standby state depends on the initial setting of the facsimile apparatus.
[0075]
As described above, since the current rectifier 20 is provided in the second path means 17, even when the calling signal arrives when the H relay 15 is turned on, the telephone does not ring. Furthermore, since the current rectifier 20 is configured by using four unidirectional elements, it is possible to detect a telephone off-hook without any problem without adding an extra circuit regardless of the direction of the line DC current. it can.
[0076]
[Third embodiment]
FIG. 4 is a block diagram showing a communication apparatus 300 according to the third embodiment of the present invention.
[0077]
The communication apparatus 300 includes first communication means CS31 and includes, for example, a modular connector that is a connection means for connecting the second communication means CS32. The first communication unit CS31 is, for example, a communication unit that performs facsimile communication, and the second communication unit CS32 is the same telephone as the second communication unit CS12.
[0078]
Further, the second route means 17 of the communication device 300 has an H detection relay 21. The H detection relay 21 is provided in the second route means 17 in the communication device 300 and on the line side from the H relay 15. In the communication device 300, the H detection relay 21 is provided only on one side of the two wires, but the H detection relay 21 may be provided on both of the two wires.
[0079]
When the H detection relay 21 is turned on, the second route means 17 is connected, and when the H relay 21 is turned off, the second route means 17 is disconnected. Other configurations are the same as those of the communication apparatus 200.
[0080]
Next, the control operation in the communication apparatus 300 will be described.
[0081]
When it is necessary to detect the hook of the telephone as the second communication means CS32 when the CML relay 11 is on, the H relay 15 is turned on and the telephone is connected to the second route means 17 to detect the second hook. The device 19 detects the hook. In the case where the operation of the facsimile communication means as the first communication means CS31 is affected while the telephone is off-hook, and the H relay 15 needs to be turned on, the H detection relay 21 is turned off, The two-route means 17 is cut. That is, the telephone is disconnected from the line.
[0082]
For example, when the telephone as the second communication means CS32 and the facsimile communication means as the first communication means CS31 are connected in parallel to the line, the characteristics of the facsimile apparatus change and affect its operation. For example, the H detection relay 21 is turned off and the second route means 17 is disconnected while the facsimile apparatus is communicating or sending a dial signal.
[0083]
According to the communication apparatus 300, as described above, the H detection relay 21 is provided, and the second path means 17 can be disconnected by the H detection relay 21, so that the facsimile apparatus is communicating or is sending a dial signal. In some cases, the telephone can be disconnected from the line so that even if the telephone is off-hooked, it is not affected by the operation of the telephone.
[0084]
Further, as described above, when the H relay 15 is turned off instead of the H detection relay 21, if the H relay 15 is a mechanical relay, the switching sound is loud. Therefore, if the H detection relay 21 is provided and controlled, the H relay 15 can be kept on, and no switching sound is generated even if the H relay 15 is a mechanical relay.
[0085]
Here, the above-described various relays are controlled by a control means such as a CPU (not shown) of the facsimile apparatus.
[0086]
[Fourth embodiment]
FIG. 5 is a circuit diagram showing a communication apparatus 400 according to the fourth embodiment of the present invention.
[0087]
The communication device 400 includes a first communication unit CS41, and further includes, for example, a modular connector that is a connection unit for connecting the second communication unit CS42. The first communication means CS41 is, for example, communication means for performing facsimile communication. In the communication apparatus 400, the first HOOK detector 18 is moved between the L1 and L2 that connect lines and the CML relay 11. . The second communication means CS42 is the same telephone as the second communication means CS32.
[0088]
Other configurations and operations are the same as those described in the communication devices 100, 200, and 300, and there is no problem even if the first HOOK detector 18 is connected to the position shown in FIG. be able to.
[0089]
In the communication apparatus 400, the first HOOK detector 18 is connected on a path for facsimile operation such as facsimile communication and dialing, and is configured to satisfy those characteristics, that is, DC characteristics and AC Configure so that the characteristics are not affected.
[0090]
In this case, the standards (insertion loss, series DC resistance, etc.) for the telephone can be easily satisfied. For example, a current sensor or a current detection relay using a Hall element can be used for the first HOOK detector 18. In this case, the presence or absence of the line current can be detected even in the operating state of the first communication means in which the first switch means is on.
[0091]
Here, the above-described various relays are controlled by a control means such as a CPU (not shown) of the facsimile apparatus.
[0092]
In the communication devices 100, 200, 300, and 400, the CML relay 11 and the H relay 15 are relays that operate simultaneously in two circuits, but instead, two one-circuit relays may be used.
[0093]
According to the communication device of the first aspect, the first communication means for communicating by connecting to the telephone line and the second communication means for connecting to and communicating with the telephone line via the first communication means are connected. And a first switch means for connecting the telephone line to either the first communication means or the second communication means, and a first switch means for connecting to the first communication means. A first route means for connecting the second communication means to the telephone line via a switch means; a second route means for directly connecting the second communication means to the telephone line; and the second communication means. , Second switch means connected to either the first route means or the second route means, first hook detection means connected to the first route means, a telephone line of the second route means, 2nd hook detection connected between 2 switch means Because it has a stage, for hook detection of the second communication means, you can have two types of hook detection means, such as separating the hook detection sensitivity can be selected depending on the usage.
[0094]
In particular, the first route means is connected and used during operation of the second communication means, and the second route means can be used only when hook detection of the second communication means is performed. In a state where the second communication means is connected to the second route means including the hook detection means, it is not necessary to satisfy other required standards as long as the hook detection of the second communication means can be performed. Therefore, the second hook detection means can be configured with inexpensive hardware (for example, a photocoupler). Furthermore, it is not necessary to provide a dedicated DC power supply that has been conventionally provided in the first communication means, and there is no noise generated from the dedicated DC power supply, thus realizing an inexpensive and small-sized communication device with lower power consumption. can do.
[0095]
According to the communication device of the second aspect, when the second switch means connects the second communication means to the first route means, the first hook detecting means is the second communication. A hook state of the second communication means is detected when the second switch means connects the second communication means to the second route means. Therefore, even when the first communication means is in the standby state or the operating state, the hook detection of the second communication means by the line current can be performed. For example, in a state where the first communication means is not connected to the line side, the hook detection of the second communication means can be performed by either the first hook detection means or the second hook detection means. Even when the first communication means is connected to the line side, the hook detection can be easily performed by the second hook detection means when the hook detection of the second communication means is necessary.
[0096]
Further, according to the communication device of the third aspect, the first hook detecting means is connected between the first switch means on the first route means and the second switch means. It is a position that does not affect the communication of the communication device, dial transmission, etc., and it only needs to satisfy the characteristics of connecting the line to the second communication means and the hook detection condition, and is composed of inexpensive hardware (photocoupler etc.) Is possible.
[0097]
According to the communication device of the fourth aspect, since the first hook detection means is connected between the telephone line and the first switch means, the first switch means is on. The presence or absence of line current can be detected even in the operating state of the first communication means.
[0098]
According to a fifth aspect of the present invention, since the off-hook detection current value of the second hook detection means is smaller than the off-hook detection current value of the first hook detection means, the current for detecting off-hook depends on the line condition. Even if it is small, off-hook can be detected without any problem.
[0099]
Furthermore, according to the communication device of the sixth aspect, the first communication means has timer determination means for determining that the hook state has changed after a certain time when the output of the hook detection means changes. The chattering of the hook switch of the second communication means, the delay of the current change due to the capacitor and resistance in the second communication means can be eliminated. In particular, even if the off-hook detection current is small and the capacitor in the second communication means is not sufficiently charged, the charge is sufficiently stored after the timer time has elapsed. There is no worry of disconnecting the line even if it is reconnected to the communication means.
[0100]
According to a seventh aspect of the present invention, there is provided a current rectifying means comprising four unidirectional elements between the telephone line of the second route means and the second switch means. Therefore, the hook detection of the second communication means by the second route means can be executed without any problem without adding an extra circuit, and the second hook detection means only needs to detect a one-way current. By using a one-way detection current detector for the hook detection means, the cost can be reduced, the incoming call signal can be made half-wave, and the call of the second communication means can be invalidated.
[0101]
Further, according to the communication device of claim 8, when the first switch means is connected to the first communication means side, the second switch means is connected to the first route means. Therefore, even when the first switch means is connected to the first communication means side, the telephone and the second route means and the line can be disconnected as necessary, and the off-hook operation of the second communication means is 1 Does not affect the operation of the communication means.
[0102]
Furthermore, according to the communication device of the ninth aspect, the second route means has third switch means between the telephone line and the second switch means, and the third switch means is the second switch means. Since it is a means for connecting and disconnecting the two-route means, the telephone and the second route means and the line can be disconnected as required while the second switch means is turned on, and the off-hook operation of the second communication means However, it does not affect the operation of the first communication means.
[0103]
According to the communication device of the tenth aspect, when the hook state of the second communication means is detected when the second switch means is connected to the second route means, the third switch means When the second switch means is connected to the second route means, and it is necessary to detect the hook state, the second communication means is connected by connecting the third switch means. Is connected to the line, current can flow from the line even when the second communication means is off-hooked, and hook detection of the second communication means can be executed without any problem.
[0104]
According to the communication device of claim 11, the first switch means is connected to the first communication means, and the third switch means disconnects the second path means while the first communication means is operating. Therefore, even when the first switch means is operating with the first communication means connected to the circuit side, the second communication means and the second communication means can be provided with the second switch means turned on as required. The route means and the line can be disconnected, and the off-hook operation of the second communication means does not affect the operation of the first communication means.
[0105]
Further, according to the communication apparatus of the twelfth aspect, a modem is used as the first communication means, and the second communication means is a telephone. The device can be used.
[0106]
【The invention's effect】
According to the present invention, there is an effect that a communication device used by connecting to an analog public line can be inexpensive and space-saving.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a communication apparatus 100 according to a first embodiment of the present invention.
FIG. 2 is a circuit diagram showing a communication apparatus 200 according to a second embodiment of the present invention.
FIG. 3 is a circuit diagram showing an example of a current rectifier 20;
FIG. 4 is a circuit diagram showing a communication apparatus 300 according to a third embodiment of the present invention.
FIG. 5 is a circuit diagram showing a communication apparatus 400 according to a fourth embodiment of the present invention.
6 shows a conventional communication device 600. FIG.
[Explanation of symbols]
100, 200, 300, 400 ... communication device,
CS11, CS21, CS31, CS41 ... first communication means,
11 ... CML relay,
12 ... DC capturing part,
13 ... Trance,
14 ... modem,
15 ... H relay,
16 ... 1st route means,
17 ... second route means,
18, 19 ... HOOK detector,
20 ... Current rectifier,
21 ... H detection relay,
CS12, CS22, CS32, CS42 ... second communication means.

Claims (12)

A communication apparatus comprising: first communication means for communicating by connecting to a telephone line; and connection means for connecting second communication means for connecting to and communicating with the telephone line via the first communication means In
The first communication means includes
First switch means for connecting the telephone line to the first communication means or the second communication means;
First route means for connecting the second communication means to the telephone line via the first switch means;
Second route means for directly connecting the second communication means to the telephone line;
Second switch means for connecting the second communication means to the first route means or the second route means;
First hook detecting means connected to the first route means;
Second hook detecting means connected between the telephone line of the second route means and the second switch means;
A communication apparatus comprising: In claim 1,
When the second switch means connects the second communication means to the first path means, the first hook detection means detects the hook state of the second communication means, and the second switch means However, when the second communication means is connected to the second route means, the second hook detection means detects the hook state of the second communication means. In claim 1 or claim 2,
The communication apparatus, wherein the first hook detecting means is connected between the first switch means on the first route means and the second switch means. In claim 1 or claim 2,
The communication apparatus, wherein the first hook detection means is connected between the telephone line and the first switch means. In any one of Claims 1-4,
The off-hook detection current value of the second hook detection means is smaller than the off-hook detection current value of the first hook detection means. In any one of Claims 1-5,
The first communication means includes timer determination means for determining that the hook state has changed after a predetermined time when the outputs of the first hook detection means and the second hook detection means change. A communication device. In any one of Claims 1-6,
A communication apparatus, wherein a current rectifying means comprising four unidirectional elements is provided between the telephone line of the second route means and the second switch means. In any one of Claims 1-7,
A communication apparatus comprising: means for connecting the second switch means to the first path means when the first switch means is connected to the first communication means side. In any one of Claims 1-8,
The second route means has third switch means between the telephone line and the second switch means, and the third switch means is means for connecting and disconnecting the second route means. A communication device. In claim 9,
When detecting the hook state of the second communication means when the second switch means is connected to the second route means, the third switch means is set to the second route means connection state. Communication device. In claim 10,
A communication apparatus, wherein the first switch means is connected to the first communication means, and the third switch means is in a disconnected state of the second route means while the first communication means is operating. In any one of Claims 1-11,
A communication device, wherein a modem is used for the first communication means, and the second communication means is a telephone.

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