JPH1188548A - CATV telephone system and its terminal device - Google Patents

Abstract

(57) [Summary] [Problem] To automatically select an optimum line according to the situation at the time of using any telephone in a subscriber's house. SOLUTION: In a CATV telephone system for extracting telephone data from data transmitted to a CATV network 14 and outputting the extracted telephone data to a plurality of telephones 40, 41 in a subscriber's house 20, any one of the telephones 40, 41 is provided. CATV telephone terminal device 22 may be used in accordance with the conditions at the time of use of the telephone set, for example, the conditions of the destination number dialed from the telephone set.
A vacant line of the V network 14 or the public telephone network 15 is automatically selected and switched for connection, and a telephone service for enabling a call with the other party through the selected optimum line is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CATV telephone system using both a CATV network and a public telephone network, and a terminal device thereof.

[0002]

[Related Background Art] In recent years, in the flow of ideas of fusion of communication and broadcasting, the CATV business has entered the stage of providing communication services from the broadcasting service centering on the conventional distribution of video and the like. In particular, at present, a so-called CATV telephone system is being used as a second telephone service.

[0003] In this CATV telephone system, in addition to a telephone line of a public telephone network (hereinafter simply referred to as "telephone line") which has been conventionally installed, a telephone line of a CATV network (hereinafter referred to as "CATV line") is used. Branched lines (for example, coaxial cables or optical fibers) are laid in each home. For this reason, telephone lines and CAT
A telephone is provided for each of the V lines.

[0004] A CATV telephone can communicate within the same CATV network through the CATV network. By connecting the CATV network to another type 1 communication carrier, the CATV telephone can communicate with a public telephone network subscriber. Make calls and international calls.

[0005]

However, in such a system, the CATV transmission line connecting the CATV center station and the subscriber's home is generally provided with backup measures such as duplication except for the trunk system. If it cannot be used due to repair work or disconnection, the high frequency band signal (R
F signal) cannot be transmitted and the wave is stopped, ie, CATV
The broadcast signal is not transmitted. In this case, CA
There was a problem that it was not possible to make a call using a TV telephone.

In order to supply power to a CATV telephone terminal provided in a subscriber's home, a power supply is provided in a CATV transmission line, and a network power supply from which a power is supplied via the CATV transmission line. There is also a method of receiving power supply (local power supply) from the subscriber's house.
In these methods, even if a power failure occurs, power must be supplied for a certain period of time. In the case of network power supply, the power supply device in the CATV transmission line is
In the case of local power supply, it is necessary to provide a backup battery in each CATV telephone terminal device.
However, since existing CATV transmission lines do not support network power supply, the above-mentioned power supply requires repair work on the transmission lines, which increases the equipment cost for CATV operators. there were. In addition, in the case of local power supply, if a battery is provided in the CATV telephone terminal device, it becomes necessary to periodically replace the battery. In this case, there is a problem that the maintenance cost is increased for the CATV operator.

[0007] In addition, when using a telephone, the user generally uses the line selection criteria as a guide to the usage fee, but as described above, it is assumed that the user uses the telephone line and the CATV line. Since each fee system is complicated, the selection criterion is difficult for the user to understand, and there is a problem that it is difficult to determine which telephone should be used for each telephone call. Furthermore, in the above-mentioned system, a public NTT telephone and a CATV telephone are separately installed in the home, and it is necessary to determine which telephone receives a call at the time of receiving a call. there were.

[0008] The present invention has been made in view of the above-mentioned problems, and is applicable to any telephone set in a subscriber's house.
It is an object of the present invention to provide a CATV telephone system capable of automatically selecting an optimum line according to a dialed destination number and a terminal device thereof.

[0009]

In order to achieve the above-mentioned object, according to the present invention, a plurality of telephones, for example, any one of two telephones and a line of a CATV network or a public telephone network are required. For example, the connection is performed by switching according to the condition of the dialed destination number, and a telephone service is performed by using a free line of the CATV network or the public telephone network.
An ATV telephone system and a terminal device thereof are provided.

[0010] That is, no matter which telephone in the subscriber's home dials the destination number, the terminal device selects and switches a free line of the CATV network or the public telephone network, and connects to the telephone. And a telephone service for automatically selecting an optimal line to enable a call with the other party. Under the condition that one of the lines of the CATV network or the public telephone network and one of the telephones are connected, the other telephone is connected to the CAT.
It is preferable to switch to and connect to a line of a V network or a public telephone network, and to use the other telephone to provide a telephone service through a free line of the CATV network or the public telephone network. For example, under the condition that one of the telephones uses the line of the CATV network, the terminal device detects the use, connects the other telephone to the line of the public telephone network, and
Even if an ATV network line cannot be used, a call can be made using an empty line of the public telephone network.

[0011] Further, under the condition that power is not supplied to the terminal device, it is preferable to select and perform a telephone service using a vacant line of the public telephone network. In other words, even when the power is not supplied due to a power failure or the like, the terminal device connects the telephone set in advance and the line of the public telephone network, thereby making a call using an empty line of the public telephone network. to enable.

Further, under the condition that the telephone service on the CATV network cannot be performed, it is preferable to select and perform the telephone service on the free line of the public telephone network. For example, when the line of the CATV network is stopped or congested, the terminal device detects the condition and connects the telephone to the line of the public telephone network. Allows outgoing and incoming calls using a free line on the network.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A CATV telephone system according to the present invention and a terminal device thereof will be described with reference to FIGS. FIG. 1 is a system configuration diagram showing an example of a CATV telephone system using a CATV terminal device according to the present invention. In the figure, the CATV center station 10 and the CATV telephone terminal device 22 installed in the subscriber home 20 are:
Connected via a CATV network 14 composed of a CATV transmission line such as a coaxial cable or an optical fiber,
It is connected via the public telephone network 15 of the first type communication carrier.

The CATV center station 10 converts the telephone signal fetched by the exchange 11 into a CATV telephone center device 12.
The signal is converted into a signal of a high frequency band (RF) and input to the head end 13. The head end 13 receives a CATV broadcast signal from a broadcast satellite, a communication satellite, or the like in addition to receiving a terrestrial broadcast, converts the broadcast signal into RF, and then transmits the RF broadcast signal and the center device 12 Combines RF telephone signals.

The combined signal is sent to the CATV telephone terminal device 22 via the CATV network 14 formed in a tree shape and the protector 21 in the subscriber's house 20.
Here, the above signal is branched into two, one of which is sent to the telephone 40 or 41 to enable a call, and the other signal is received by the home terminal 42 and a CATV broadcast signal modulated into an RF signal is demodulated. Then, the television 43 can display an image or the like.

Further, the CATV telephone terminal device 22 uses a number dialed from the telephone 40 or 41 to transmit
An optimum line (for example, a line with a low call charge) of the CATV line 16 of the ATV network 14 or the telephone line 17 of the public telephone network 15 is automatically selected to enable a call with the other party. FIG. 2 is a block diagram showing an example of the configuration of the CATV telephone terminal device shown in FIG. In the figure, the CATV telephone terminal device 22 of the present embodiment includes a connector 23 connected to the center station 10 via the CATV line 16,
Modular connector 24 connected to public telephone network 15 via telephone line 17, modular connectors 25 and 26 connected to telephones 40 and 41, and home terminal 4
2 and a connector 27 to be connected.

The number dialed from telephone 40 or 41 via modular connector 25 or 26
When the ATV line 16 is selected, the line switch 30
The telephone and the CATV line 16 are connected. The CATV telephone signal including the dialed number is sent to the CATV telephone terminal modem 29, where it is converted into an RF signal and transmitted to the CATV line 16, and furthermore, using the upstream signal transmission band of the CATV, the CATV center station. It is transmitted to ten headends 13.

After that, the above CATV telephone signal is
The CATV telephone signal, which is transmitted to the V telephone center device 12, where it is composed of an RF signal, is demodulated into a voice signal,
Sent to exchange 11. In the exchange 11, the subscriber home 2
According to the number dialed from the telephone 40 or 41 in 0, a route is selected and connected to the other party. In the exchange 11, it is possible to make an exchange connection with a subscriber in the same CATV network. However, since the public telephone network 15 and the exchange 11 are connected, the exchange with the subscriber in the public telephone network 15 is possible. Calls are also possible.

A telephone signal from the other side of the telephone call is sent from the exchange 11 to the CATV telephone center device 12, where it is modulated into an RF signal and then transmitted to the head end 13. The head end 13 uses the CATV broadcast signal and the CATV downlink signal transmission band to
The data is transmitted to the subscriber home 20 via the transmission path 14. C
A signal from the ATV center station 10 is divided into two by a distributor 28 via a protector 21 connected to a connector 23, and one of the signals is transmitted from a connector 27 to a home terminal 42. The other signal is CATV
The signal is distributed to the telephone terminal modem 29, where it is demodulated from the RF signal to a telephone signal of a predetermined frequency band,
0 is sent to the telephone to enable a telephone call.

The CATV telephone terminal modem 29 is
It monitors a stop condition where the CATV broadcast signal is not transmitted to the CATV line 16, a condition where the line is congested, and the like. And C
If the ATV line 16 cannot be used for any reason, the change is detected, and an abnormal signal 31 is sent from the CPU (not shown) to the line switch 30, and the ATV line 1
6 is not available.

The power supply monitoring circuit 32 monitors the power supply voltage of the telephone line 17 of the public telephone network 15 (the power supply voltage for operating the telephones 40 and 41). When the power supply voltage is different from the normal value set in advance, the power supply monitoring circuit 32 sends an abnormal signal 33 to the line switch 30 to notify that the telephone line 17 of the public telephone network 15 cannot be used. Notice.

As shown in FIG. 3, the line switch 30
Changeover switches 30a, 30b for connecting to the ATV telephone terminal modem 29 or the telephone line 17 of the public telephone network 15.
A line selection table 30c for storing data serving as selection conditions for the CATV line 16 and the telephone line 17, a dial transmission circuit 30d for transmitting the telephone number of the other party after the telephone line to be used for calling is selected, Notification circuit 30 for notifying the user when the line used at the time is not the optimum line (for example, a line with a low call charge).
e, an audible sound transmission circuit 30f for transmitting a dial tone, a busy tone, or the like to the telephone, and a line and a line switching control circuit, which will be described later, connected between the telephones 40, 41 and the switches 30a, 30b. Changeover switches 30g, 30h for changing over 30i, and changeover switches 30a, 30b, 30g, 30h based on dialed numbers, abnormal signals, and the like.
And a line switching control circuit 30i (an example of the line switching control means of the present invention) for performing switching control of (an example of the switching means of the present invention).

The changeover switches 30a and 30b perform state transitions shown in Tables 1 and 2 below when a call is made to the caller and a call is received from the caller.

[0024]

[Table 1]

[0025]

[Table 2] The changeover switches 30a and 30b perform state transitions shown in Tables 3 and 4 below when a CATV network failure and a public telephone network failure occur.

[0026]

[Table 3]

[0027]

[Table 4] The changeover switches 30a and 30b are provided with a line switch control circuit 30i.
The state is changed as in each of the above-described cases based on the switching control of.

The line selection table 30c stores the line switch 3
A line selection condition of 0 is stored, and the selection condition is to associate a line to be used with a dialed telephone number. In this embodiment, the same CAT
Calls with subscribers in the V network are cheaper on the CATV line 16 than on the telephone line 17 of the public telephone network 15, and calls with subscribers on the public telephone network 15 are less expensive. It is assumed that a call through the public telephone network 15 is cheaper, and a call with a subscriber in the same CATV network 14 is
The above selection conditions are set so that the CATV line 16 is selected.

The changeover switches 30g and 30h are connected to the terminal f when the power is on and not used (in the initial stage), and are connected to the terminal e during a call, based on the switching control of the line switching control circuit 30i. Connected to. The changeover switches 30g and 30h are connected to the terminal e when the power is off. The line switching control circuit 30i is provided with a changeover switch 30a, 30b, 30 based on the state transition at the time of calling and receiving.
g, 30h, and at the time of outgoing call, instruct the dial outgoing circuit 30d to send out the telephone number of the other party, instruct the notifying circuit 30e to notify, and detect the up of the handset of the telephone at the time of outgoing call to the audible sound transmitting circuit 30f. A dial tone transmission instruction has been issued.

Next, the terminal device 2 for CATV telephone at the time of outgoing call
2 will be described with reference to the flowcharts of FIGS. Here, as an example, a case in which a call is made by the telephone 40 will be described.
The telephone number of the subscriber in the network is, for example, "0463-69-
xxxx "(xxxx is an arbitrary number). First, when the receiver of the telephone 40 is picked up, the line switching control circuit 30i
Detects this (step 101) and instructs the audible sound transmission circuit 30f to transmit a dial tone (step 1).
02). Based on this instruction, the audible sound transmission circuit 30f
A dial tone is transmitted to the telephone 40.

Next, when the telephone number of the other party is dialed from the telephone set 40, the line switching control circuit 30i detects this (step 103) and instructs the audible sound transmission circuit 30f to stop transmitting the dial tone. At the same time (step 104), the number is compared with the other party's telephone number in the line selection table 30c to select an appropriate line to use (step 105). Here, the dialed telephone number is "0463-69-xxxx" or "69-xxx."
In the case of "x", the CATV line 16 is selected; otherwise, the telephone line 17 is selected. Further, the line switching control circuit 30i is connected to the CATV line 16 and the telephone line 1
7 are not used (step 10).
6).

If both of the two lines are not used, the corresponding changeover switch 30a or 30b is switched to the used line side (step 107). In the present embodiment, the changeover switch 30a connected to the telephone 40 is switched to the terminal a, and the telephone 40
The connection is made to the TV line 16, and the changeover switch 30b connected to the telephone 41 is switched to the terminal c on the public telephone network 14 side. At the same time, the line switching control circuit 30i instructs the dial sending circuit 30d to send the number dialed to the optimal line, and the dial sending circuit 30d.
Sends the dialed number to CATV line 1 based on the above instruction.
6 (step 108).

Then, the line switch control circuit 30i switches the corresponding switch 30g or 30h to the line in use (step 109) to enable a telephone call between the dialed party and the connected telephone 40 (step 109). Step 11
0). When the call ends and the receiver is put down, the changeover switch 30a is switched to the contact b side, the changeover switch 30b is switched to the contact d side, and the changeover switches 30g and 30h are switched to the contact f.
Side, and returns to the initial state (at the time of standby) (see Table 1).

In step 106, if neither line is in an unused state, that is, if one line is in use,
Or, if it cannot be used, proceed to FIG.
Alternatively, it is determined whether the unusable line is the line selected in step 105 (step 111). If the line that is being used or cannot be used is not the selected line, the process proceeds to step 107 to perform the above operation.
If the line in use or unavailable is the selected line, the other line is selected and the call charge of the line to be used is set in the line selection table 30c.
(Step 112). Here, the operation of the terminal device 22 when the line is in use and when it cannot be used will be described separately for each case.

First, the case where one line is in use will be described. For example, during a call using the telephone 41 and the CATV line 16, the changeover switch 30a is connected to the terminal b.
The switch 30b is connected to the terminal d (see Table 1). For this reason, even when the number dialed from the telephone 40 is “0463-69-xxxx” (including the case of only this local station number), the CATV line 16 cannot be used.

Therefore, in this embodiment, the communication fee is set high, but the communication is set so that the telephone call can be made even through the public telephone network 15. In this case, the line switching control circuit 30i first compares the call fee of the selected CATV line 16 with the line (telephone line 17) detected in step 112, and the detected line has a higher call rate than the other line. It is determined whether the fee is high (step 113).

Here, if the detected line has the same or lower call charges than the other line, the dial transmission circuit 30d is controlled to transmit the dial number to the telephone line 17, which is a free line. With (Step 1
16) The corresponding changeover switch 30g or 30h (30g in this embodiment) is switched to the contact e side (step 1).
17), telephone 40 connected to the dialed destination
(Step 118).

If it is determined in step 113 that the detected line has a higher call charge than the other line, the line switching control circuit 30i sends a notification from the notification circuit 30e to the telephone 40 indicating that the CATV line 16 cannot be used. An instruction is sent to notify (step 114). As a method of this notification, transmission of a preset message, notification by sound, or the like can be considered.

When this notification is given, the user can confirm that a call cannot be made on a line with a low call charge. Here, when the user does not want to make a call using the line having a high call charge, the user may hang up the handset, and when he wants to make a call using the line having a high call charge, he raises the handset. What is necessary is just to hold as it is. After the notification, the line switching control circuit 30i determines whether or not the user has a call, ie, whether or not the user makes a call by turning on / off the hook switch (step 1).
15).

Here, when the handset is placed, the line switch 30 determines that no telephone call is to be made, terminates the above operation, and returns to the standby state (step 119). Also,
If the handset remains up, step 116
The operations of .about.118 are performed to enable a telephone call with the telephone 40 connected to the called party. This allows
In the present embodiment, the telephone service using the vacant channel of the CATV network or the telephone service using the public telephone network is selected and performed. Therefore, even if any telephone in the subscriber's house is used, the other party dialed from the telephone is used. The optimum line can be automatically selected according to the destination number, and a call with the other party can be made.

In this embodiment, when one of the lines of the CATV network or the public telephone network is connected to one of the telephones, one of the two telephone services is selected and the other telephone is connected. Since a call is used, even if one network line cannot be used, a free line of the other network can be automatically selected and a call can be made with the other telephone, thereby effectively using the line. be able to.

Next, the operation of the terminal device 22 when the line cannot be used will be described. The reason why the CATV line 16 cannot be used is, for example, disconnection of a cable of a CATV network or CA.
CATV broadcast signal is CAT due to TV amplifier failure etc.
This is the case where there is no wave transmitted to the V line 16 or the line is congested and there are no empty lines.

In such a case, the CATV center station 1
0 including CATV telephone signals from the head end 13 of CA
The TV broadcast signal is not transmitted to the subscriber home 20. The CATV telephone terminal modem 29 in the terminal device 22 monitors such a condition and sends an abnormal signal 31 indicating that the CATV line cannot be used to the line switch 30 (see FIG. 2).

Line switching control circuit 30 in line switching unit 30
In i, when the abnormal signal 31 is received, the CATV line 16
Is detected, the switch 30a is forcibly connected to the contact b on the telephone line 17 side, and the switch 30b is forcibly connected to the contact c on the telephone line 17 side. When making a call from the telephone 40 in this state, when the receiver of the telephone 40 is lifted up, the dial tone is transmitted from the audible sound transmission circuit 30f to the telephone 40 since the switch 30g is connected to the contact f side. . When the dial number is sent from the telephone 40 to the line switching control circuit 30i,
If the dial tone transmission is stopped and the dialed number is "69-xxxx", the operations of steps 111 to 119 shown in FIG. 5 are performed. If a call is made with the other party by making a connection, and no call is made, the system returns to the standby state and waits for the next call.

If the receiver is picked up while trying to make a call from the telephone 41 while talking on the telephone 40, the line switching control circuit 30i detects that fact and sends an audible sound transmission circuit 30f to the telephone 41. "Not possible", for example, a busy tone is transmitted. The public telephone network 15
The telephone line 17 becomes unavailable, for example, when the connection between the subscriber's home 20 and the public telephone network 15 is disconnected.

In such a case, the power supply monitoring circuit 32 in the terminal device 22 supplies the power supply voltage of the telephone line 17 (the telephone 4
The power supply voltage for operating 0, 41 is monitored, and when it is detected that the power supply has been stopped, an abnormal signal 33 indicating that the telephone line cannot be used is transmitted to the line switch 30 (see FIG. 2). . When receiving the abnormal signal 33, the line switching control circuit 30i detects that the telephone line 17 is abnormal, and switches the switch 30a to the contact a on the CATV line 16 side and connects the switch 30b to the CATV line 16
Forced connection to the side contact d. In this state, telephone 4
When making a call from 0, when the receiver of the telephone 40 is picked up, the dial tone is transmitted from the audible sound transmission circuit 30f to the telephone 40 because the changeover switch 30g is connected to the contact f side. When the dial number is sent from the telephone set 40 to the line switching control circuit 30i, the dial tone transmission is stopped, and if the dial number is other than "69-xxxx" (including the area code). The operations of steps 111 to 119 shown in FIG. 5 are performed, and when a call is made, the CATV line 16 is connected to the telephone 40 to enable a call with the other party. Return to the state of time and wait for the next call.

If the receiver is picked up while trying to make a call from the telephone 41 while talking on the telephone 40, the line switching control circuit 30i detects that fact and cannot be used from the audible sound transmission circuit 30f to the telephone 41. Is transmitted, for example, a busy tone is transmitted. That is, in the present embodiment, C
The ATV telephone terminal modem 29 monitors the state of the CATV line 14, and when the state changes, an abnormal signal 3
1 is sent to the line switching control circuit 30i of the line switching device 30. When the abnormal signal 31 is input, the line switching control circuit 30i controls the switches 30a, 30b, 30g, and 30h to switch the telephone line 16 and the telephone 40 so that the telephone line 16 is forcibly used. Connect.

The power supply monitoring circuit 32 is connected to the telephone line 16.
The power supply monitoring circuit 32 sends an abnormal signal 33 to the line switching control circuit 30i of the line switch 30 when the power supply voltage is different from a preset normal value. When the abnormal signal 33 is input, the line switching control circuit 30i controls switching of the changeover switches 30a, 30b, 30g, and 30h so as to forcibly use the CATV line 14, and connects the CATV line 14 with the telephone 40. Connect.

When the line in which the abnormality has occurred returns to a normal state, the CATV telephone terminal modem 29 and the power supply monitoring circuit 32 stop outputting the abnormal signals 31 and 33 and send the signal to the line switch 30. Inform. When detecting the stop of the abnormal signal, the line switching control circuit 30i of the line switching unit 30 shifts from the forced switching control described above to the normal state switching control.

Therefore, in this embodiment, the state of both lines is
Monitoring is performed by the ATV telephone terminal modem and the power supply monitoring circuit, and if one of the lines becomes unavailable for some reason, the system is forcibly switched to use the other line. Line selection can be performed automatically. In the present invention, in addition to monitoring the presence or absence of various carrier signals on the CATV network, for example, CAT
Other monitoring methods can be used, such as monitoring the status of the V-phone terminal modem. Even with a CATV telephone terminal device having such a monitoring function, a communication line can be duplicated for each home, and even when one of the lines is abnormal, the user can easily perform the operation without complicated operation or line selection. You can use the phone.

When a power outage occurs in the subscriber home 20, the terminal device 22 normally receives power supply from the subscriber home 20 and does not have a backup battery. become unable. Since it is a problem in operation of the CATV telephone system that a telephone call cannot be made in such a state, in the present embodiment, it is set so that a telephone call can be made using the telephone line 17 of the public telephone network 15.

That is, in the public telephone network 15, even if a power failure occurs, power is supplied for driving a telephone in the subscriber home 20 from a subscriber exchange (not shown) within a certain period of time. Therefore, a call is possible. For this reason,
When a power failure occurs, the line switch 30 of the terminal device 22
Switch 30a, 30b in the public telephone network 1
5 is set to be connected to the telephone line 17 side. However,
In this case, since two telephones cannot be used at the same time, it is necessary to set in advance that only one of the telephones 40 and 41 can be used when a power failure occurs.

For example, if it is set that the telephone 40 can be used at the time of a power failure, when the power of the terminal device 22 is turned off, the switch 30 in the line switch 30 is turned off.
a is connected to the contact b side, and the changeover switch 30b is connected to the contact d side. Then, the changeover switches 30g and 30h are also connected to the contact e side. In this way, the telephone 4
When the receiver of 0 is picked up, a dial tone is sent out from the public telephone network 15 and a telephone call becomes possible by dialing a telephone number. At this time, if the dial tone transmitted from the public telephone network 15 is set to a different sound from the dial tone transmitted from the audible sound transmission circuit 30f, the user is out of power and the public telephone network 15 You can recognize that you can only make calls via

As described above, in this embodiment, when a power failure occurs, the telephone service using the public telephone network is selected and performed, so that even if the CATV network line cannot be used, the public telephone network line cannot be used. Can be used, and the operational reliability of the CATV telephone system can be improved. Next, C
The operation of the ATV telephone terminal device 22 will be described with reference to the flowchart of FIG. If there is an incoming call from the CATV line of the CATV network or the telephone line of the public telephone network,
The line switching control circuit 30i receives the incoming signal, and switches the telephone set (for example, the telephone 40 or 41 or both) that is set in advance so that the bell rings at the time of the incoming call to the incoming line side to connect the switch. 30b operation control,
Thereafter, the changeover switches 30g and 30h are switched to the contact e side to connect the line with the telephone so that the incoming signal is sent to the desired telephone, thereby ringing the bell of the telephone. Therefore, in this embodiment, both telephones 40, 41
And the switch 30a is connected to the contact b on the public telephone network 15 and the switch 30b is connected to the contact d on the CATV network 14 during standby (see Table 2). , CATV network CATV
A case where an incoming call is received from the line 16 will be described.

In such a state, first, the CATV line 16
When there is an incoming call, the line switching control circuit 30i detects this by receiving the incoming signal (step 201).
It is determined whether it is possible to receive a call with the telephone (step 20).
2). If one of the telephones is in use and cannot respond to the incoming call, the line switching control circuit 30i connects the switch 30a or 30b of the telephone capable of receiving the call to the contact on the incoming line (step 203). Further, the switch 30g or 30h of the telephone capable of receiving an incoming call is connected to the contact e side (step 204), and the telephone is connected to the incoming call line, and an incoming signal is sent to a desired telephone. Sounds. In this embodiment, the CAT
In the case of an incoming call from the V line, the switching control of the changeover switch 30b is not necessary when the telephone 41 can answer, but when the telephone 40 can answer, the changeover switch 30a is connected to the contact a on the incoming line (CATV line) side. There is a need.

When the line switching control circuit 30i detects that the receiver of the telephone which can receive a call is picked up (step 2).
05), it is possible to detect that the telephone is connected to the CATV line and that a telephone call is possible (step 2).
06). In step 202, if both telephones can receive a call, the line switching control circuit 30i sets the changeover switch 30a of the telephone capable of receiving a call to the incoming line (CAT).
(V line) or the switch 30b is connected to the contact d on the incoming line side (step 207).
Is connected to the contact e side (step 208), an incoming signal is sent to the telephones 40 and 41, and the bell of each telephone rings.

Next, when the line switch control circuit 30i detects that the handset of one of the telephones, for example, the telephone 40, has been picked up (step 209), the line switch control circuit 30i switches the changeover switch 30b of the telephone 41 which does not respond to the contact c of the telephone line 17 to the contact c. By connecting the switch and the changeover switch 30h to the contact f side (step 210), the telephone 41 and the CATV line 1 are connected.
Release the connection with 6. Then, by securing the connection between the answering telephone 40 and the CATV line 16, a telephone call becomes possible (step 211).

Thus, in this embodiment, when there is an incoming call at the subscriber's house, it is possible to answer with at least one of the two telephones, so that the user can use either of the lines. The response communication can be performed without being conscious of the incoming call. If there is an incoming call from the public telephone network 15 at the time of failure of the CATV network 14, the changeover switches 30a and 30b have already turned on the contacts b and c on the telephone line 17 side.
(See Table 3), when one telephone responds, the changeover switch 30 on the other telephone
By connecting a or 30b to the contact a or d on the CATV line 16, the telephone which does not respond and the telephone line 17 can be opened.

When the public telephone network 15 fails, the CATV
When there is an incoming call from the network 14, the changeover switch 3
Since 0a and 30b are connected to the contacts a and d on the CATV network 14 side (see Table 4), when one telephone responds, the changeover switch 30a or 3 on the other telephone side.
By connecting 0b to the contact b or c on the telephone line 17, the telephone which does not respond and the CATV line 16 can be opened.

When a call is received from the public telephone network 15 at the time of a power outage at the subscriber's home 20, the switch 30a is connected to the contact b on the public telephone network 15 side, and the switch 30g is connected to the contact so that the telephone 40 can be used. Since it is connected to the e side, even if there is an incoming call via the public telephone network 15, the user can make a good answering call. In addition, the operation of the CATV telephone system according to the present invention is not limited to the case of these embodiments, and various other operations can be considered.

[0061]

As described above, according to the present invention, CA
2. Description of the Related Art In a CATV telephone system that extracts telephone data from data transmitted to a TV network and outputs the data to a telephone, a predetermined telephone of a plurality of telephones and a line of the CATV network or a public telephone network are used as conditions. A terminal device for selecting one of the lines of the CATV network or the public telephone network according to the condition of the dialed destination number and connecting the line to a predetermined telephone; Selects a telephone service using a vacant line in the telephone network and uses each telephone to make a call, so no matter which telephone in the subscriber's premises is used, the optimal line is automatically selected according to the dialed destination number. it can.

Further, under the condition that either one of the lines of the CATV network or the public telephone network is connected to one of the telephones, the telephone is connected to a free line of the CATV network or the public telephone network. Since a service is selected and a call is made using the other telephone, even if a line on one network is unavailable, a call on the other telephone is automatically selected by selecting a free line on the other network. it can.

Further, under the condition that power is not supplied to the terminal device, the telephone service using the public telephone network is selected and performed, so that even if the CATV network line cannot be used, the public telephone network line is not used. Calls can be used and operability is improved. Further, under the condition that the telephone service on the CATV network cannot be performed, the telephone service using the vacant line of the public telephone network is selected and performed. Therefore, even if the line of the CATV network cannot be used, the telephone service of the public telephone network is used. Outgoing,
Incoming calls can be received, further improving operability.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an example of a CATV telephone system using a CATV telephone terminal device according to the present invention.

FIG. 2 is a block diagram showing an example of a configuration of the CATV telephone terminal device shown in FIG.

FIG. 3 is a block diagram showing an example of a configuration of a line switch shown in FIG. 2;

4 is a flowchart showing an operation of the CATV telephone terminal device shown in FIG. 2 at the time of calling.

FIG. 5 is a flowchart showing an operation of the CATV telephone terminal device when making a call.

FIG. 6 is a flowchart showing the operation of the CATV telephone terminal device when receiving a call;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 CATV center station 14 CATV network 15 Public telephone network 16 CATV line 17 Telephone line 20 Subscriber's house 22 CATV telephone terminal device with line switching function 28 Distributor 29 CATV telephone terminal modem 30 Line switching device 30a, 30b, 30g, 30h Changeover switch 30c Line selection table 30d Dial transmission circuit 30e Notification circuit 30f Audible sound transmission circuit 30i Line switching control circuit 32 Power supply monitoring circuit 40, 41 Telephone

Claims (10)

[Claims] 1. A CATV telephone system for extracting telephone data from data transmitted to a CATV network and outputting the extracted data to a telephone, wherein the telephone is a telephone of a plurality of telephones and a line of the CATV network or a public telephone network. CATV telephones, comprising: a terminal device that switches and connects the terminals according to conditions, and selects a telephone service using the free line of the CATV network or the public telephone network and performs a call using each telephone. system. 2. The CATV according to a condition of a destination number dialed from any one of the telephones.
2. The CATV telephone system according to claim 1, wherein either one of a network and a line of a public telephone network is selected, and the line is connected to the predetermined telephone. 3. Under a condition that one of the lines of the CATV network or the public telephone network is connected to one of the telephones, an idle line of the CATV network or the public telephone network is used. 2. The CATV telephone system according to claim 1, wherein a telephone service is selected and a telephone call is made using the other telephone. 4. The system according to claim 1, wherein, under the condition that power is not supplied to said terminal device, a telephone service using an available line of said public telephone network is selected and a telephone call is made using said telephone. The CATV telephone system as described. 5. The telephone system according to claim 1, wherein, under the condition that the telephone service on the CATV network is disabled, a telephone service using a vacant line of the public telephone network is selected and a telephone call is performed using the telephone. The CATV telephone system as described. 6. A terminal device of a CATV telephone system for extracting telephone data from data communicated on a CATV network and outputting the extracted telephone data to a telephone, a plurality of first connection means to which the plurality of telephones are respectively connected, A plurality of second connection means to which lines of the CATV network and the public telephone network are respectively connected; any one of the telephones;
Line switching control means for performing a line switching control according to conditions with a line of either a network or a public telephone network; a predetermined telephone among the telephones under the control of the line switching control means; the CATV network or A terminal device comprising: switching means for switching a line with a line of a public telephone network. 7. The line switching control means selects one of the CATV network and the public telephone network according to a condition of a destination number dialed from one of the telephones. The terminal device according to claim 6, wherein control is performed to connect the line to the telephone. 8. The CATV control apparatus according to claim 1, wherein
Under the condition that one of the lines of the network or the public telephone network is connected to one of the telephones, a control for connecting the other telephone to a free line of the CATV network or the public telephone network. The terminal device according to claim 6, wherein 9. The apparatus according to claim 6, wherein said switching means connects a line of said public telephone network to a predetermined telephone among said telephones under a condition that power is not supplied to said terminal device. The terminal device as described in the above. 10. The CAT switching means comprises:
7. The terminal device according to claim 6, wherein control is performed to connect a line of the public telephone network to a predetermined telephone among the telephones under a condition that the telephone service by the V network cannot be performed.