JPS6155305B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a call control system for a button telephone device using three-pair lines that enables voice calls during a call.

Key telephones have been put into practical use with features such as mutual calling between extensions and ease of handling. There are two types of button telephones: a so-called multi-wire type and an electronic type using three pairs of lines, which improves the disadvantage of the multi-wire type in that it requires a large number of wires. This electronic button telephone device connects the main device and each button telephone with three pairs of lines, but in the conventional type, each pair of three pairs of lines is a voice communication path,
In addition, the uplink and downlink control signal transmission paths are used to send and receive control signals between the main unit and the key telephones using time division multiplexing, and the uplink and downlink control signal transmission paths are used to supply power to each button telephone. I practiced it with great faith. Initially, a ringing sound source for a ring tone was installed inside each button telephone, and in order to make a call, this sound source was driven by a control signal from the main unit to generate the ring tone. It was occurring. However, in this case, it is not possible to make an extension voice call, which is possible with a normal multi-wire key telephone device. Therefore, by taking advantage of the fact that the 3-pair voice communication path is vacant except during the call period, the button telephone side switches the destination of the voice communication path from the handset side to the calling speaker side using a control signal from the main device. It is being considered to configure a signal path for a voice call using a voice call. This allows voice calls and also allows use of this signal path for tone ringer calls. However, even in this case, voice calls cannot be made during a call. Of course, it is possible to make voice calls possible by increasing the number of lines in the conventional electronic key telephone system, but this has not been actually realized due to the inconvenience caused by the increase in the number of lines. Therefore, there has been a desire for a button telephone device that takes advantage of the features of the three-pair line and allows voice calls to be made during a call in the same way as a multi-line type.

The present invention has been made focusing on the above circumstances,
The purpose of this is to create a 3-pair line by providing a voice call transmission line and a calling voice transmission line independently on the 3-pair line, and by providing a call cross-point independently of the call cross-point in the main device. To provide a button telephone device which enables voice calling during a call, and also enables voice calling of a plurality of independent extensions.

An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is for explaining this invention.
For clarity, the handset side and the ringing speaker side of the key telephone are shown separately. To explain the configuration, 1 and 2 are central lines;
is the call cross point 5 via the central office line circuits 3 and 4.
connected to. An extension circuit 6 is connected to this call crosspoint 5, and this extension circuit 6 is further connected to a calling crosspoint 8 via an extension calling circuit 7. A central office line paging circuit 9 is connected to this paging crosspoint 8 . Terminal circuits 10A, 11A, 12A are selectively connected to the office line circuits 3, 4 and the extension circuit 6 at the call cross point 5.
Transceivers 13, 14, and 15 are connected via.
On the other hand, call speakers 16, 17, and 18 are connected to the call cross point 8 via terminal circuits 10B, 11B, and 12B that are selectively connected to the office line call circuit 9 and the extension call circuit 7. Furthermore, handset 1
3, 14, 15 and call speakers 16, 17, 18
constitute the respective key telephones 20, 21, 22, and the other part 23 is the main device. The handsets 13, 14, 15 of each button telephone 20, 21, 22 and the main device 23 are connected by speech tone transmission lines 24, 25, 26, and the call speakers 16, 17, 18 and the main device 23 are connected. are connected by calling voice transmission lines 27, 28, and 29.

To explain the operation in this configuration, first of all, in the case of a central office line call, for example, when the button telephone 20 selects the central office line 1, the handset 13 and the telephone voice transmission line 2
4. Connected to the central office line 1 via the terminal circuit 10A, the point 5a of the call cross point 5, and the central office line circuit 3.

Next, in the case of an incoming call from a central office line, when an incoming signal is given from the central office line 2, the incoming call is detected in the central office line circuit 4, and a preset key telephone, for example, the key telephone 21, is When tone paging is performed, a ring tone is generated from the central office line paging circuit 9, sent to the paging speaker 17 via the paging cross point 8, the terminal circuit 11B, and the paging audio transmission line 28, and from the speaker 17. A ring tone is generated.

This voice call is provided with a call crosspoint 5 and an independent call crosspoint 8, and the ringing tone is transmitted through a route different from the call path, so even if the key telephone 21 to be called is in the middle of a call, can also be called.

If the button telephone 21 responds here,
The handset 14 includes a call voice transmission path 25, a terminal circuit 11A, a point 5b of the call cross point 5,
It is connected to the office line 2 via the office line circuit 4 and a response is made. At this time, since the incoming call detection on the office line 2 disappears for the previous office line call, the call stops and the point 8a of the call cross point 8 is restored.

Next, in the case of an extension call, for example, if the key telephone 20 makes the call, this key telephone 2
The handset 13 of No. 0 has a voice transmission line 24, a terminal circuit 10A, a point 5c of the voice cross point 5,
It is connected to an extension circuit 6 and an extension calling circuit 7. If you dial in this state, the called party will be selected. In the case of MF dialing, this dialing signal can be directly given to the extension calling circuit 9 through the communication path. Alternatively, the dial signal can be transmitted as a control signal from the key telephone to the main unit through an uplink control signal transmission path and provided to the extension calling circuit 7.

Now, suppose that the called party is the button telephone set 21 through the dialing operation described above.

If a voice call is to be made here, the voice from the key telephone 20 is transmitted to the extension calling circuit 7 as described above, and then further transmitted to the point 8b of the calling cross point 8, the terminal circuit 11B, and the calling voice channel 28. is sent to the intermediary calling speaker 17,
A voice call is made. This extension voice call is also possible even if the key telephone 21 on the called party's side is busy.

In addition, although we talked about voice calls above,
The present invention is not limited to this, and tone calling may be performed by, for example, cutting the route in the extension paging circuit 7, sending a ringback tone to the calling party, and sending a ringing tone to the called party. can.

In addition, in the above-mentioned voice call, by adding a hands-free answering device having the functions of a calling speaker and a microphone in place of the calling speaker 17 of the called person's button telephone 21, the caller can receive a call from the caller's button telephone 20. It is also possible to use the line up to the person's button telephone 21 in both directions for calling and hands-free response.

Next, the case of an extension call will be explained. It is assumed that an extension call is made as described above and that the call is answered. Since a response can be made from any button telephone device in the case of a button telephone device, a case will be described here in which, for example, the button telephone 22 responds. That is, the handset 1 of the button telephone 22
5 is connected to the call voice transmission line 26, the terminal circuit 12A, the point 5d of the call crosspoint 5, and the extension circuit 6, and the caller's button telephone 20 is connected in parallel to the extension circuit 6 via the call crosspoint 5. connected to.

At this time, the calling of the extension is stopped, the connection between the extension circuit 6 and the extension calling circuit 7 is cut off, and the point 8b of the calling cross point 8 is restored.

In this way, calls between extension lines can be made.

As mentioned above, the configuration shown in Fig. 1 makes it possible to realize a key telephone device that allows voice calls during a call, but as a more specific example, Fig. 2 describes an example in which three pairs of lines are used for the transmission line. do. 3 pairs of lines 3 between the button telephone 20 and the main device 23
1 is provided, and each pair 31A of the three pairs of lines 31,
31B and 31C on the button telephone 20 side are connected to a telephone circuit network 35, a parallel-to-serial conversion circuit 36, and a serial-to-parallel conversion circuit 37 via transformers 32, 33, and 34, respectively, and the telephone circuit network 35 is connected to the handset 13. A line selection switch 38 is connected to the parallel-serial conversion circuit 36, and a display element 39 is connected to the parallel-serial conversion circuit 37. In the button telephone 20, the calling speaker 16 is connected to a transformer 41 via an amplifier 40, and both ends of the secondary winding of the transformer 41 are connected to the midpoint of the secondary windings of the transformers 32 and 33. Furthermore, both poles of the power supply circuit 42 are connected to the midpoint of the secondary windings of the transformers 41 and 34.

On the other hand, on the main device 23 side, each pair 31 of the three pairs of lines 31
Transformers 43, 44, and 45 forming the terminal circuit 10 are connected to A, 31B, and 31C. The primary winding of the transformer 43 is connected to the communication cross point 5, and the primary winding of the transformer 44 is connected to the receiving circuit 4.
6, and the primary winding of the transformer 45 is connected to a transmitting circuit 47. Furthermore, transformers 43, 44
2 of the transformer 48 between the respective midpoints of the secondary windings of
The primary winding of this transformer 48 is connected to the calling crosspoint 8. Further, a power source 49 is connected between the middle points of the secondary windings of the transformers 48 and 45.

In such a configuration, the button telephone 20 is supplied with driving power from the power supply 49 of the main device 23. The supply path enters the midpoint of the transformer 48 from the power supply 49, enters the midpoint of the transformers 43 and 44 from both ends thereof, and then passes through the pairs 31A and 31B of the three pairs of lines 31 in parallel from both ends of the transformer 48, and the key telephone 2.
0 transformers 32 and 33, enters both ends of the transformer 41 from the midpoint thereof, exits from the midpoint and enters one end of the power supply circuit 42. Also, on the return trip, power supply circuit 4
The main device 2 enters the center point of the transformer 34 from the other end of 2, and connects to the main device 2 from both ends via the pair 31C of the 3 pairs of lines 31.
It enters both ends of the transformer 45 of No. 3, and enters the other end of the power supply 49 from its midpoint.

In this way, the power supply circuit 4 of the button telephone 20
Power is supplied to 2, and power is supplied to each part from this power supply circuit 42.

First, to make a call, turn off the hook switch and operate the line selection switch 38 by pressing the line selection button, and then the uplink control signal time-division multiplexed via the parallel-to-serial conversion circuit 36 is sent to the transformer 3.
3, the main device 23 through the pair 31B of the three-pair line 31
and is guided from the transformer 44 of the terminal circuit 10 to the receiving circuit 46. Although not shown, the output of the receiving circuit 46 drives a control circuit to make a desired point of the communication cross point 5 conductive, thereby putting the office line circuit or extension line circuit into a communication state. Then, the handset 13 of the button telephone 20 is connected to the call cross point 5 via the telephone circuit network 35, the transformer 32, the pair 31A of the 3-pair line 31, and further via the transformer 43 of the terminal circuit 10, and a transmission path for the call voice is established. It is formed.

Next, when receiving a call, a control signal for the call is given from the control circuit (not shown) of the main device 23 to the transmitting circuit 47, and this is sent as a downlink control signal to the key telephone 20 via the transformer 45 and the pair 31C of the three-pair line 31. The signal is sent to the serial-to-parallel conversion circuit 37 via the transformer 34, where it demodulates the time-division multiplexed control signal. This control signal turns on the light emitting element (generally a light emitting diode) 39 and puts the amplifier 40 into operation.

On the other hand, the ring tone at this time passes from the ring cross point 8 of the main device 23 to the transformer 48 of the terminal circuit 10, and then enters the midpoint between transformers 43 and 44,
The signal is transmitted using the pair 31A and the pair 31B of the paired line 31. In the button telephone 20, the transformer 32,
Receive at 33, exit from each midpoint and transform to 4
1. The signal enters the ringing speaker 16 via the amplifier 40, and a ringing tone is generated from the ringing speaker 16.

As mentioned above, for the three-pair line 31, each pair constitutes a speech voice transmission line, an uplink control signal transmission line, and a downlink control signal transmission line, and furthermore, the pair 31A and the pair 31B
In addition, the outgoing route is further coupled to the paired lines 31A and 31B, and the return route is further coupled to the pair 31C to form a power supply transmission line. In each of these transmission lines, if the transformer and the line are sufficiently balanced, they will not interfere with each other and stable operation will be maintained. However, since the power supply transmission line has different line impedances on the outbound and return lines, it is not a perfectly balanced transmission line, but there is no problem in terms of power supply.

By using the three-pair line in this manner, the call voice transmission line and the calling voice transmission line can be provided independently, and it becomes possible to make a voice call during a call.

That is, in the present invention, a voice call cross point and a call cross point are provided independently on the main device side, and a voice call transmission line and a call voice transmission line are provided in the three pairs of lines, thereby making it possible to make a voice call to a button telephone set during a call. I am now able to do this. Moreover, since the present invention uses a paging crosspoint, it is possible to make a plurality of independent voice calls to extensions, resulting in extremely high call performance.

Further, in the present invention, since extension calls and office line calls are made through a common call crosspoint, the voice path can be made into one, and the system configuration can be simplified. This effect is
This is extremely effective in the present invention in which three pairs of lines are used and the number of transmission lines is controlled.

Furthermore, for extension calls, the caller's and responder's button telephones are connected in parallel to the extension circuit by a call crosspoint, so that a call crosspoint corresponding to the line selection button of each button telephone can be established. Just by preparing it, you can make internal calls, and it can be used in the same way as a multi-wire key telephone device.

Another feature of the arrangement according to the invention is that it has three pairs of lines and five
By obtaining two independent transmission lines and using a total of six wires in three pairs of lines for power transmission, line loss during power feeding can be kept to a minimum, compared to the conventional four-wire transmission line. This makes it possible to supply power over longer distances.

In the embodiment shown in FIG. 1, the extension circuit and the extension calling circuit are connected one to one, but for example, one extension circuit can be connected to the extension calling circuit at the same time by hunting, such as four extension circuits to one calling circuit. Alternatively, a plurality of extension calling circuits may be provided, and furthermore, an attendant's key telephone may be directly connected to the extension calling circuit to form a DSS (direct calling).

As described in detail above, according to the present invention, by providing the call crosspoint and the call crosspoint independently, it is possible to call an extension line during a call even though it has a three-pair line configuration, and moreover, it is possible to call an extension line during a call even though the call crosspoint is configured as a three-pair line. Accordingly, it is possible to provide a button telephone device having a simple configuration that allows extension calls to be made.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a configuration example of a button telephone device according to the present invention, and FIG. 2 is a diagram showing a case where the main device of the button telephone device shown in FIG. 1 and the button telephone are connected by a three-pair line. FIG. 3 is a wiring diagram showing a specific example. 1, 2...Station line, 3, 4...Station line circuit, 5...
Call cross point, 6... Extension circuit, 7... Extension calling circuit, 8... Calling cross point, 9...
Office line calling circuit, 10A, 10B, 11A, 11
B, 12A, 12B...Terminal circuit, 13, 14,
15... Handset, 16, 17, 18... Calling speaker, 20, 21, 22... Key telephone, 23
...Main device, 24, 25, 26... Call voice transmission line, 27, 28, 29... Call voice transmission line, 31
...3 pairs of lines, 31A, 31B, 31C... pairs,
32, 33, 34...Transformer, 35...Telephone circuit network, 36...Parallel-serial conversion circuit, 37...Series-parallel conversion circuit, 38...Line selection switch, 3
9... Light emitting element, 40... Amplifier, 41... Transformer, 42... Power supply circuit, 43, 44, 45...
Transformer, 46... Receiving circuit, 47... Transmitting circuit, 48... Transformer, 49... Power supply.

Claims (1)

[Scope of Claims] In a button telephone device in which a one-button telephone and a main device are connected by three pairs of lines, the button Uplink and downlink control signal transmission paths, call audio transmission paths, and call audio transmission paths are configured for exchanging control signals between the telephone and the main device, and the main device includes a handset for each button telephone and the above-mentioned telephone receiver. A call cross point connected via a call voice transmission line and a call cross point connected to the call speaker of each button telephone and the call voice transmission line are provided independently, and this call cross point has a connection with the central office line. A central office line circuit is provided in between, a central office line calling circuit is provided at the calling cross point, and an extension circuit and an extension calling circuit are provided between the calling cross point and the calling cross point, and when an extension voice call is made, a button is pressed. Telephone handset - Call voice transmission line - Call crosspoint - Extension circuit - Extension calling circuit - Calling crosspoint - Calling voice transmission line -
Voice is transmitted through the route of the ringing speaker of the button telephone, and during an extension call, the handset and receiver of the button telephone - call voice transmission line - call cross point - extension circuit - call cross point - call voice transmission line - key telephone handset. A button telephone device characterized in that a call voice is transmitted through a route. 2. Among the real lines of each pair of three-pair lines, a first double trust line is configured between the first real line and the second real line, and a first double trust line is configured between the first double trust line and the third real line. 2nd in between
By configuring a double trust line, five independent transmission lines are constructed for the three pairs of lines, and the second double trust line supplies power from the main unit to the button telephone, and the other four lines are connected to each other. 2. The button telephone device according to claim 1, wherein the key telephone device is used for a speech voice transmission line, a call voice transmission line, and an uplink and downlink control signal transmission line.