JPH03117156A - Ordering communication equipment - Google Patents

Abstract

PURPOSE:To attain communication at any time as required by applying changeover control to a line toward the data transmission or the talking side based cn the presence of a specific frequency signal mixed in a data. CONSTITUTION:When a talking switch 12 is depressed to ON while switches 8a, 8b of a changeover circuit 8 are thrown to the position of a data transmission circuit 3 and data transmission is implemented, if a specific frequency signal S1 is not lost within a prescribed time, a speech display lamp 14 is inactive, a line 11 is thrown to the position of the data transmission circuit 3 and the operation restores to the ST 2. If the specific frequency signal S1 is lost within a prescribed time, it is discriminated to be production of a speech request, a terminal equipment 2 outputting the specific frequency signal S1 and the line 11 are connected, the switches 8a, 8b of the changeover circuit 8 are thrown to the position of a speech circuit 7 to make communication.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a system consisting of a plurality of devices connected via a telephone line, in which each device mutually transmits data and makes a meeting call as necessary. The present invention relates to a communication device for meetings.

[Prior Art] For example, a system shown in FIG. 4 is known as a system that collects data from a plurality of distributed devices and centrally manages the data, and also conducts a meeting call between the devices as necessary.

This system connects a distribution device 23 to a parent device 20 that centrally manages data via a signal line 21 and a telephone line 22.
is connected to the distribution device 23, and a plurality of terminal devices 24 are distributed and connected to the distribution device 23 by a line 25, and the parent device 2
0 and the distribution device 23 via a signal line 21 when transmitting and receiving data, and via a telephone line 22 when making a meeting call, respectively, using a dedicated line as necessary. It was being implemented.

By the way, when transmitting data or making a meeting call between the distribution device 23 and each terminal device 24, the distribution device 23 switches the line 25 to perform the communication. To explain further, normally, the distribution device 23 and each terminal device 24
The line 25 is switched to the signal line side so that data can be transmitted in both directions.
When a call request signal is sent from the distribution device 23 or the terminal device 24 to the other party's device, the other party's device receives this call request signal, lights up a call lamp, and prompts the operator to switch the line 25 to the call line side. Put up signs to encourage people to do so. Then, the operator manually operates the switch according to this display to switch the line 25 to the call line that allows meeting calls and makes the call, and after the call ends, both parties switch the line 25 back to the signal line that allows data transmission. I was switching to the side.

[Problem to be Solved by the Invention] However, in the above-mentioned conventional system, when making a call between devices, the operator manually operated a switch according to the display to switch the line 25 to the call line. Failures often occur in which the line 25 is forgotten to be switched after the end of a call, resulting in an interruption without proceeding to data transmission, and subsequent data is interrupted, making accurate data transmission impossible.

By the way, in order to solve the above-mentioned problem, a method has been proposed for low-speed data transmission in which the band of the communication line is divided and a band for pig transmission and a call band are exclusively allocated so that data transmission and phone calls can be carried out simultaneously. Since high-speed data transmission requires a wide band for data transmission and a communication band to be allocated, data transmission and communication cannot be performed simultaneously within the limited band.

Therefore, the present invention was made in view of the above-mentioned problems, and its purpose is to prevent data transmission from being interrupted due to forgetting to change the switch after the end of a call. The purpose of the present invention is to provide a meeting call device.

[Means for Solving the Problems] In order to achieve the above object, a meeting call device according to the present invention is applicable to a system in which data is normally transmitted between at least two or more devices, and a meeting call is made as necessary. , each of the devices includes a specific frequency signal output means for outputting a specific frequency signal within the same band as the data during data transmission, a detection means for detecting a specific frequency signal from the other device, and a detection means based on the detection result of the detection means. The device is characterized in that it includes a switching means for switching the line between the communication device and the other device to the data transmission side or the communication side.

[Operation] Each device usually outputs a specific frequency signal within the same band as the data for data transmission, and when the other device detects disconnection of this specific frequency signal, it switches the line from the data transmission side to the call side.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of a meeting call device according to the present invention.

The meeting call device according to this embodiment has a distribution device 1 connected to a parent device that centrally manages data via a signal line and a telephone line, and terminal devices 2 distributed in this distribution device 1. Data transmission or phone calls are performed between the two using switching operations.

The distribution device 1 is placed in a room dedicated to communication, etc., and includes a data transmission circuit 3, a specific frequency signal generator 4, a mixing circuit 5, a specific frequency removal filter 6, a communication circuit 7, a switching circuit 8, a specific frequency signal detection circuit 9, It is configured to include a control circuit 10.

The data transmission circuit 3 sends and receives data to and from the line-connected terminal device 2 through the line 11, and the transmission data D1 at this time is supplied to the mixing circuit 5.

In other words, 3300Hz, which does not occur during calls.
By continuously transmitting this high frequency, it becomes possible to determine that it is not a telephone call.

The specific frequency signal generator 4 generates a specific frequency signal S of a frequency within the same band of transmitted and received data, for example, 3300 Hz.
1, and this specific frequency signal S1 is supplied to the mixing circuit 5.

The mixing circuit 5 mixes the transmission data D1 from the data transmission circuit 3 and the specific frequency signal S1 from the specific frequency signal generator 4, and outputs the mixture to the terminal device 2 side via the switching circuit 8 and the line 11. As a result, when data is transmitted, not only the transmission data D1 but also the specific frequency signal S1 is necessarily mixed with this data D1 and transmitted over the line 11.

The specific frequency signal removal filter 6 receives the transmission data D1 from the terminal device 2, which is a partner device connected to the line, as received data D2, removes the specific frequency signal S1 included in this received data D2, and sends it to the data transmission circuit 3. It is output to.

The telephone communication circuit 7 performs a telephone conversation with the terminal device 2 connected to the terminal device 2 through the switching circuit 8 and the telephone line 11 by transmitting and receiving a transmitting signal S2 and a receiving signal S3.

The switching circuit 8 is composed of two transmitting side line changeover switches 8a and a receiving side line changeover switch 8b, and is configured so that the line 11 is connected only to either the data transmission circuit 3 or the communication circuit 7. 3 and line 1] and the communication circuit 7 and line 11.
Normally, switching is made so that the data transmission circuit 3 side is selected.

The specific frequency signal detection circuit 9 is connected to the terminal device 2 via a line.
The specific frequency signal S1 included in the received data D2 from is detected and output to the control circuit 10.

The control circuit 10 includes a call switch 12 and a call termination switch 1.
3, the switches 8a and 8b of the switching circuit 8 are switched, the call indicator lamp 14 is turned on, and the discharge buzzer 15 is turned on based on the presence or absence of the specific frequency signal S1 from the specific frequency signal detection circuit 9 for a predetermined time or more. It is equipped with a discrimination circuit 10a that controls the ringing. To explain further, when the call switch 12 is pressed, a switching signal S4 is output to the switching circuit 8 so that each switch 8a, 8b of the switching circuit 8 is switched to the call circuit 7 side. Further, if the specific frequency signal 81 from the specific frequency signal detection circuit 9 is supplied for a predetermined time or longer, it is determined that data transmission is being performed, and the switching signal S5 indicates the current line connection state, that is, the pig transmission circuit 3. If the specific frequency signal SL is not supplied for a predetermined period of time or more, it is determined that there is a call request from the terminal device 2 side, and the call display lamp 14 blinks, The discharge buzzer 15 is sounded and a switching signal S4 is outputted to switch the switching circuit 8 to the communication circuit 7 side. Furthermore, when a line connection is made to any terminal device 2 and a call is being made, when the call ends and the end call switch 13 is pressed, each switch 8a, 8b of the switching circuit 8 is turned off. A switching signal S5 is output to the switching circuit 8 so as to switch to the data transmission circuit 3 side. The control circuit 10 also includes a timer circuit lOb activated by a specific frequency signal S1 from the specific frequency signal detection circuit 9. If the specific frequency signal S1 is not supplied from the specific frequency signal detection circuit 9 after a predetermined period of time has elapsed after activation, the timer circuit 10b determines that there is a call request from the terminal device 2 and turns on the call indicator lamp 14. At the same time, the discharge buzzer 15
sounds and switches the switching circuit 8 to the communication circuit 7 side. Further, if the specific frequency signal S1 is not interrupted even after a predetermined period of time has elapsed, it is determined that the other party's terminal device 2 is absent and there is no call request, and the switching circuit 8 is maintained on the data transmission circuit 3 side.

The terminal devices 2 are distributed in remote locations apart from the distribution device 1, and the terminal devices 2 have the same configuration as the distribution device 1. It is connected via a line 11 so that the transmission signal S2 of the device 2 is transmitted as the reception signal S3 of the distribution device 1.

Note that components of the terminal device 2 that correspond to each part of the dispensing device 1 are given the same numbers and their explanations will be omitted.

Next, the operation of the meeting telephone device configured as described above will be explained based on the flowchart shown in FIG.

Each switch 8a, 8b of the switching circuit 8 is connected to the data transmission circuit 3.
while data transmission is in progress (
STI), when the call switch 12 is pressed and turned on (
sr2-yes), the call display lamp 14 turns on and lights up (Sr1). If the specific frequency signal S1 is not interrupted within a predetermined time (ST4-No), the call display lamp 14 is turned off, the line 11 is switched to the data transmission circuit 3 side (ST5), and the operation returns to ST2. If the specific frequency signal S1 is interrupted within a predetermined time (ST4-Y
es), specific frequency signal S1 when a call request has occurred.
Each switch 8a of the switching circuit 8 connects the terminal device 2 and the line 11 outputting the .

Switch 8b to the call circuit 7 side (ST6) and make a call (
ST7).

Next, when the call ends and the end call switch 13 is turned on (
(ST8-Yes), turn off the call indicator lamp 14, switch the line 11 to the data transmission circuit 3 side, and restore (ST8-Yes).
9) Return to the operation of ST2.

If the end switch 13 of any of the devices 1.2 with which the call is being made remains off (ST8-No), and the specific frequency signal S1 is received from the other party's device for a predetermined period of time or longer (ST10). -Yes), proceed to the operation of ST9. If the specific frequency signal S1 has not been received from the partner device for a predetermined period of time or longer (ST10-No), the process returns to ST8.

On the other hand, if the call switch 12 is not on during data transmission (ST2-No) and the specific frequency signal S1 from the other party's device is not cut off for a predetermined period of time (
STI 1-No), the operation of ST2 is repeated.

If the specific frequency signal S1 from the other party's device is cut off for a predetermined period of time or more (STII Yes), the call indicator lamp 14 flashes and the call buzzer 15 sounds (ST12). Then, when the call switch 12 is pressed and turned on (ST13
-Yes), the call display lamp 14 is turned on, the call buzzer 15 is turned off, and the line 11 is switched to the call circuit 7 side (ST
14), ST to start a call in this state 15), S
Shift to operation T7.

On the other hand, the call switch 12 is not turned on (ST13No),
If the specific frequency signal S1 is received from the other party's device for a predetermined period of time or more (ST16-Yes), the call display lamp 14 and the calling buzzer 15 are turned off (ST17). If the specific frequency signal S1 is not received for a predetermined period of time (ST1
6-No), 2 Return to the operation of ST13.

Therefore, in the embodiment described above, switching between the data transmission circuit 3 and the communication circuit 7 between the lines 11 is performed based on the presence or absence of the specific frequency signal S1 output from each device 1.2 together with the data Di and D2 for a predetermined period of time or longer. A call can be made between the distribution device 1 and the terminal device 2 under control, and when the call ends, the line 11 is closed by operating the end switch 13 in at least one of the devices 1 and 2 with which the call is being made. Since it automatically returns to the data transmission circuit 3 side, it is possible to switch between data transmission and telephone calls without interrupting data transmission due to forgetting to operate a switch as in the conventional case.

In the example, a telephone line and a data transmission line are distinguished by detecting 3300 Hz for a predetermined period of time or more, but the frequency is not limited to this, and the frequency of occurrence of transmission on a telephone line is determined. It is sufficient to select fewer signals.

Incidentally, in the above-mentioned embodiment, an example was explained in which the terminal devices 2 were connected one-to-one to one side of one distribution device 1 via the line 11, but as shown in FIG. Similar effects can be obtained when the terminal device 2 is connected via the line 11.

Furthermore, although the above example describes the case where the distribution device 1 and the terminal device 2 are connected, it can also be applied to the case where the parent device and the terminal device 2 are connected via the distribution device 1.

In other words, the scope of application of the above-mentioned telephone communication system is that data is normally transmitted through a single line, and as long as it is possible to make a telephone call through the same line as necessary, it can be applied to any device other than the above-mentioned embodiments, such as a ship. It can also be applied to incoming lines. In this case, there are two possible methods: one is to perform data transmission or call switching while the line is connected, and the other is to specify the other party and perform data transmission or call.

[Effects of the Invention 1 As explained above, the meeting telephone device according to the present invention has the following advantages:
Since the line is switched to either the data transmission side or the calling side based on the presence or absence of a specific frequency signal mixed with data, you can make a call at any time as needed, and you can also use the Interruption of data transmission can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the meeting call device according to the present invention, FIG. 2 is a flowchart showing the operation of the device, and FIG. 3 is a block diagram showing a schematic configuration of another embodiment of the device. 4 are block diagrams showing a schematic configuration of a system to which a conventional meeting call device is applied. 1...Distribution device (device) 2...Terminal device (device)
, 3... data transmission circuit, 4... specific frequency signal generator (specific frequency signal output means), 7... telephone call circuit,
8...Switching circuit (switching means), 9...Specific frequency signal detection means (detection means), 10-...Control circuit, 11.
・-Line. 5

Claims (1)

[Claims] In a system in which data is normally transmitted between at least two or more devices, and a meeting call is made as necessary, each of the devices transmits a specific frequency signal within the same band as the data during data transmission. A specific frequency signal output means for outputting, a detection means for detecting a specific frequency signal from the other party's device, and a switching means for switching the line between the other party's device to the data transmission side or the calling side based on the detection result of the detection means. A meeting telephone device characterized by comprising: