JPS5812468A - Tie telephone set - Google Patents

Abstract

PURPOSE:To store call requests from terminals in storage area, to display those pieces of information, and to make the call requests from the terminals clear on a center side, by providing a memory which has storage areas corresponding to data circuits respectively. CONSTITUTION:To terminal devices connected to data circuits, a center 60 is connected through the data circuits, and to those data circuits, a multiplexer 31 and relay contacts 50 provided individually for the respective circuits are connected. In the memory 37 of this center 60, request signals from the terminal devices are stored, and the address for writing to the memory 37 is specified by an address counter 39 while synchronizing with the switching of the multiplexer 31. The request signals are supplied from the multiplexer 31 to an incoming detecting circuit 34 and every time, one request is made, a 1-signal generating circuit 35 outputs logic 1. Then, it is supplied through an OR gate 36 to the memory 37, and the request signal which corresponds to a circuit selected by the multiplexer 31 is stored in the memory 37; and information from the memory 37 is displayed on a display device 27 by being specified by an address counter 40, thus making the call requests clear.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact telephone device, and particularly to a communication telephone device that selects one of a plurality of data lines connecting one terminal and a center, uses the selected data line as a telephone line, and The present invention relates to a communication telephone device that allows a telephone call to be made between a machine and a center.

BACKGROUND ART Road information display boards that display road information have been placed at various locations on roads, expressways, and the like.

Such a road information display board displays road information transmitted from a center via a data line. In such a system, when inspecting or repairing the road information display board, there are cases where it is desired to make a telephone call between the road information display board as a terminal and the center. However, since telephone lines are not often connected to road information display boards, it is not possible to easily make calls. Therefore, it is conceivable to use the data line as a telephone line. However, the number of terminals is very large, and each data line is connected to the center. Since data lines do not have exchanges like telephone lines, K needs to install a telephone for each line in order to communicate with each terminal, but this is not realistic. Not. Conventionally, people would call the center from a public telephone located near a road information display board to specify the line they wanted to call, and the center would connect the telephone to the nine specified lines and make a call between the terminal side and the center side. There was the annoyance of having to do it.

Therefore, the main object of the present invention is to enable a plurality of terminals to make a call request via a data line, and to store the number of the data line to which each terminal that made a call request is connected. It is an object of the present invention to provide a contact telephone device capable of displaying the number.

To summarize the invention, a memory having a storage area corresponding to each of a plurality of data lines is provided, and each time there is a call request from a terminal, this is detected and the data line to which the terminal is connected is detected. The system is configured to store information that there is a call request in a storage area of the memory corresponding to the memory area, and to sequentially read out and display the contents of this memory.

The present invention will be described in more detail below along with embodiments shown in the drawings.

FIG. 1 is a schematic block diagram of a terminal included in an embodiment of the present invention. In the configuration, when data is transmitted using a data line, when data is transmitted from the center, this data is transferred to the hybrid coil 2. Game) 3. Bandpass filter (B, P, F) 4,
Amplifier 5. The signal is provided to the processing section 7 via the demodulator 6. Also, when transmitting data from terminal 1 to the center,
From the processing section 7 to the modulator 8. Gate 9. Amplifier 10. Data is transmitted via the hybrid coil 2 for data circulation. Such a configuration is well known in the art. When the terminal 1 makes a call request to the center, a call signal is output. In this rounding, oscillation circuit 1
1 and a transmission control section 12, this oscillation circuit 11 transmits clock pulses to the transmission control section 12 and a gate control circuit 14.
give to. The transmission control unit 12 is provided with a switch 13, and when the switch 13 is operated, the transmission control unit 12 outputs a transmission signal. When one switch 13 is operated at the same time, a control signal is given from the transmission control section 12 to the gate control circuit 14. This gate control circuit 14 is connected to each gate 3.
, 9, 15, 17, 18, and 19, respectively. That is, when the switch 13 is operated, the gate control circuit 14 opens the gates 15 and 17 and closes the others. Further, when the switch 13 is not operated, the gates 15 and 17 are closed and the other gates are opened. Therefore, when the switch 13 is operated, the transmission signal output from the transmission control section 12 is transmitted to the gate 15. Bandpass filter 16. Gate 17. Amplifier 10. The signal is transmitted to the center via the hybrid coil 2.

When a calling signal is input from the center to terminal 1,
This call signal is sent to the hybrid coil 2° gate 18. Bandpass filter 16. The signal is applied to the call 9 incoming call detection circuit 20 via the gate 19.

This paging 9 incoming call detection circuit 20 detects a paging signal and an end signal. When it is detected that a calling signal has been input, the incoming call indicator 21 is turned on and the incoming call buzzer 22 is made to sound.

FIG. 2 is an external view of the contact telephone device provided at the center. This contact telephone device 25 includes a handset 26 and a display 27.
, a number selection switch 28 , a call switch 29 , and an end switch 30 . The handset 26 is used to communicate with the terminal 1.

The display 27 displays the number of the data line to which the terminal that requested the call is connected. The number selection switch 28 is used to select the number of the data line to which the requested terminal is connected. The call switch 29 is used to call the corresponding terminal by operating the call switch 29 after selecting a number with the number selection switch 28. End switch 30
is operated when a call with a terminal is ended.

FIG. 3 is a schematic block diagram of the center side included in one embodiment of the present invention. When transmitting data between the terminal 1 and the center 60, K is the relay contact 50.
The data line is connected to a modem 54. In this embodiment, the data lines are e.g.
It is assumed that there are 4 lines. These data lines are connected to multiplexer 31. This multiplexer 31 sequentially switches 64 data lines.

Note that the relay contacts 50 are individually provided for each data line, and the contacts 3 are commonly connected. In FIG. 3, only one system out of 64 data lines is shown.

A memory 37 is provided as a storage means for storing information about the rare occurrence of a call request from the terminal l.

This memory 37 has storage areas corresponding to, for example, 64 data lines. The write address of this memory 37 is addressed in synchronization with the switching of the multiplexer 31. For this purpose, address counter 3
9 is provided. This address counter 39 counts clock pulses of, for example, 41 QHz output from the oscillation circuit 38, specifies the write address of the memory 37 based on the count output signal, and sequentially switches the multiplexer 31. Therefore, when there is a call request from the terminal 1, this call request signal is transmitted from the multiplexer 31 to the amplifier 32. The signal is applied to an incoming call detection circuit 34 via a bandpass filter 33. When the incoming call detection circuit 34 detects that there is a call request, the "1" signal generation circuit 35 outputs a logic "1" signal. This signal is OR gate 36
is applied to the memory 37 via. Therefore, the memory 37 stores a logic "1" in the storage area corresponding to the data line selected by the multiplexer 31 as information indicating that a call request has been made.

An address counter 40 is provided for reading information stored in memory 37. This address counter 40 counts, for example, a 1 kHz clock signal output from the oscillation circuit 38. The count output signal of the address counter 40 is applied to the memory 37 as a successive address signal, and is also applied to the 1 gate 42. When a read address is designated, the memory 37 reads information from the corresponding storage area and provides it to the "1" signal generation circuit 41. The rlJ signal generation circuit 41 provides a logic "1" signal to the gate 42 based on the read information. The data output from the gate 42 is given to a hold circuit 43. The hold circuit 43 displays the information read from the memory 37 on the display 27 for a certain period of time. This hold circuit 4
3, for example, when displaying data at address n of the memory 37, the address counter 40 repeatedly counts a 1kHz clock signal, and the memory 37 continuously outputs data using an address signal with a relatively fast cycle. Since the data is displayed on the device 27 at a speed that is invisible to the naked eye,
This is to display data only during visible time. Then, the data in the storage area n is displayed, and in order to display the next data at the address of the storage area n+1, the data is held and displayed for a time of 64 lines x 1mwtxn+1.

When making a call to a terminal that has requested a call, the number of the data line displayed on the display 27 is selected using the number selection switch 28. When the number selection switch 28 is operated, a signal is given to the gates 45 and 46, and when the call switch 29 is operated, the gate 45 is opened. When the gate 45 is opened, the number selected by the number selection switch 28 is applied to the memory 37 via the number selection switch 28. As a result, data is successively output from the addressed storage area of the memory 37 and displayed on the display 27.

On the other hand, since the gate 45 is opened, a control signal is given to the relay drive circuit 49. In response, relay drive circuit 49 switches relay contact 50 to the negative side. When the calling switch 29 is operated, an output signal is also given to the calling signal generating circuit 51 via the delay circuit 47. The delay circuit 47 compensates for the time it takes for the relay contact 50 to be switched to the third side. Therefore, the calling signal generating circuit 51 outputs the calling signal after the relay contact 50 is switched to @. The calling signal 51 with the hybrid coil 53 .
Terminal IK is applied via relay contact 5G. Since the relay contact 50 has been switched to the negative side, the center 6
A conversation can be made between the handset 26 of 0 and the telephone 24 of terminal 1. When the call ends, the end switch 30 is operated.

When the end switch 30 is operated, the end signal generation circuit 52
A termination signal is output from the hybrid coil 53. It is transmitted to the terminal device 1 side via the relay contact 50. At the same time, the output signal of termination switch 30 is applied to memory 37 via gate 46° OR gate 56 as an address signal.

At this time, the "0" signal generation circuit 4 is output from the termination switch 30.
A signal is also given to 4, and this signal causes the logic
0'' signal is applied to the memory 37 via the OR gate 36. Therefore, the data in the addressed storage area of memory 37 is erased. Further, the signal output from the gate 46 is delayed by a predetermined time in a delay circuit 48 and is then applied to a relay drive circuit 49. In response, the relay drive circuit 49 switches the relay contact 50 to the b side.

Next, the operation of one embodiment of the present invention will be described with reference to FIGS. 1 to 3. When the switch 13 of the terminal device 1 is operated, a transmission signal is output from the transmission control section 12. This transmitted signal is passed through a gate 15° band pass filter 16.
．． Gate 17. Amplifier 10° hybrid coil 2. It is transmitted to the server 60 via a data line. The multiplexer 31 sequentially switches data lines in accordance with the address signal given from the address counter 39, and outputs a calling signal when it selects the data line to which the terminal 1 that has requested a call is connected. The incoming call detection circuit 34 detects this outgoing signal and stores the data in the storage area of the memory 37 corresponding to the data number mK for which the call request was made. The data stored in the memory 37 is immediately read out by address designation by the address counter 40 and displayed on the display 27.

When a call request is received from a plurality of terminals 1, data is stored in a storage area corresponding to a data line to which each terminal 1 is connected. Based on these data, the data line numbers are sequentially displayed on the display 27.

Then, the user inputs the number of the data line connected to the terminal to which he or she wants to make a call from the number selection switch 28. At the same time, when the call switch 29 is operated, data corresponding to the selected data line is read out from the memory 37 and displayed on the display 27. At the same time, the relay contact 50 is switched to the negative side, and the calling signal output from the calling signal generating circuit 51 is given to the terminal 1.

This call signal is the vibration of the terminal, lid coil 2°)18. Bandpass filter 16. The call 9 is detected by the incoming call detection circuit 20 via the gate 19.

In response to this detection, the incoming call indicator 21 is displayed and the incoming call buzzer 22 sounds. A conversation is then made between the handset 26 of the center 60 and the telephone 24 of the terminal 1.

When ending one episode, the end switch 30 is operated. Then, an address signal is output from the gate 46 and becomes "0".
A logic “0” signal is applied from the signal generation circuit 44 to the memory 37. Therefore, the data in the storage area corresponding to the data line to which the terminal that was currently talking is erased. At the same time, a termination signal is transmitted from the termination signal generation circuit 52 to the terminal device 1. Further, after being delayed for a predetermined time by the delay circuit 48, the relay drive circuit 49 switches the relay contact 50 to the b side. Therefore, data is thereafter transmitted between the modem 54 of the center 60 and the terminal 1.

As described above, according to this embodiment, the center 6° is provided with a memory 37 having a storage area corresponding to each data line, and when a call request is received from a terminal, the terminal is connected. Store data indicating that there is a call request in a storage area corresponding to the data line,
Since this data can be immediately displayed on the display, the center 60 can clearly see from which terminal a call request has been made. When making a call, the user uses the number selection switch to specify the data line connected to the terminal that requested the call and operates the call switch 29 to call the desired terminal 1 and make the call. be able to. Therefore, when repairing or inspecting a terminal such as a road information display board, communication between the center and the terminal can be carried out relatively easily.

As described above, according to the present invention, a memory having a storage area corresponding to each of a plurality of data lines is provided, and in response to a call request from each terminal, the terminal is connected. Stores information indicating the use of the data line in the storage area corresponding to the data line, and stores this information.
Since the information is displayed, the center side can clearly see from which terminal a call request has been made.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a terminal included in an embodiment of the present invention. FIG. 2 is an external view of an embodiment of the present invention. FIG. 3 is a schematic block diagram of the center side included in one embodiment of the present invention. In the figure, 1 is a terminal, 11 is an oscillation circuit, 12 is a call control unit, 20 is an incoming call detection circuit, 21 is an incoming call indicator,
22 is an incoming call buzzer, 26 is a handset, 27 is a display, 2
8 is a number selection switch, 29 is a call switch, 30 is an end switch, 31 is a multiplexer, 34 is an incoming call detection circuit, 37 is a memory, 38 is an oscillation circuit, 39.40 is an address counter, 42 is a gate, 43 is a hold circuit , 4
9 is a relay drive circuit, 50 is a relay contact, 51 is a calling signal generation circuit, and 52 is an end signal generation circuit.

Claims (6)

[Claims] (1) A contact phone call that selects one of a plurality of data lines connecting the terminal and the center and uses the selected data line as a telephone line to make a call between the terminal and the center. In the apparatus, the center includes: a detection means for detecting a call request from the terminal; a storage means including a storage area corresponding to each of the plurality of data lines; and a detection signal outputted from the detection means. a writing means for storing information representing the use of the data line in a storage area of the storage means corresponding to the data line connected to the terminal that made the call request; 1. A contact telephone device, comprising: successive means for sequentially reading out each piece of information that has been read out; and a display means for displaying the information read by said successive means. (2) The display means displays the information of the storage area read from the storage means for a certain period of time, and after displaying the information for the certain period of time, displays the information read from the primary storage area. A contact telephone device according to claim (1). (3) The center comprises a specifying means for specifying the line number on which the call request was made, a selecting means for selecting a data line having the line number specified by the specifying means, and nine data lines selected by the selecting means. and a calling signal output means for outputting a calling signal to a terminal connected to the terminal.
A contact telephone device according to claim (1). (4) The detection means includes a switching means that sequentially switches the plurality of data lines, and a call detection unit that detects when a terminal connected to the data line switched by the switching means requests a call. A communication telephone device according to claim 1, comprising: means. (5) The writing means causes the switching means to sequentially switch the plurality of data lines and, in synchronization with the switching, outputs an address signal for sequentially specifying each storage area of the storage means. including the means of designation;
A contact telephone device according to claim (4). (6) The terminal device connected to the data line selected by the center selection means receives the detection signal from the call signal detection means for detecting the call signal from the center and the touge call ML translation H output means. The contact telephone device according to claim (3), which includes a notification means for making notification.