JPS5910635B2 - Display signal control method of button telephone device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display signal control method for a button telephone device that has a simple configuration and can perform reliable display control.

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 type connects the main device and the button telephone with three pairs of lines, and uses multiplexing technology to send control signals, making the control circuit complicated and the entire device complicated and expensive. There was a trend. The present invention has been made in consideration of these points, and has three points.
For button telephone devices that use paired lines and time-division multiplexed control signals, the configuration of the circuit portion that controls the display elements such as lamps is significantly simplified, and the overall configuration of the button device is simplified. The present invention provides a display signal Fbl leg system of a button telephone device that realizes simplification.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a key telephone device to which the present invention is applied, and the handset and receiver sides of the key telephone are shown separately for simplicity. i.e. 1
, 2 are office lines, and these office lines 1 and 2 are connected to a communication cross point 5 via office line circuits 3 and 4. An extension circuit 6 is connected to this call/talk cross point 5.
is further connected to the calling crosspoint 8 via the extension calling circuit 7.
connected to. A central office line paging circuit 9 is connected to this paging crosspoint 8 . The telephone cross point 5 is connected to the handset 13,
14 and 15 are connected. 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 13
, 14, 15 and call speakers 16, 17, 18 constitute each button telephone set 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. The terminals are connected by calling voice transmission lines 27, 28, and 29.
In addition, 20S, 21S, 22S are each button telephone 20, 2.
1 and 22 are button switches, and 30, 31, and 32 are uplink control signal transmission lines. 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, the telephone voice transmission line 24, the terminal circuit 10A, and the telephone cross point 5 are connected. 5a, connected to the office line 1 via the 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 key telephone 21 answers here, the handset 14 is connected to the office line 2 via the call voice transmission line 25, the terminal circuit 11A, the point 5b of the call cross point 5, and the office line circuit 4, and a response is made. It will be done.

At this time, since the incoming call detection on the central office line 2 for the previous office line call disappears, the calling stops and the calling crosspoints 8 and 8a are restored. Next, in the case of an extension call, for example, if the key telephone 20 makes the call, the handset 13 of the key telephone 20 is connected to the telephone voice transmission path 24, the terminal circuit 10A, the point 5C of the telephone crosspoint 5, the extension circuit 6, It is connected to the 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 7 through the communication path. Alternatively, the dial signal can be transmitted as a control signal from the key telephone to the main device through the upper V 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 point 8b of the calling cross point 8.
, is sent to the calling speaker 17 via the calling voice communication path 28 of the terminal circuit 11B, and a voice calling is performed.

Note that voice calls from this extension are also made using the button telephone 21 on the called party's side.
This is possible even if the user is on a call. Although the above description is about voice calling, this is not limited to this. For example, the extension calling circuit 7 disconnects the route, sends a ring back tone to the calling party, and sends a ring back tone to the called party. Tone calls can also be made by sending a tone.

In addition, in addition to the above-mentioned voice calling, by adding a temporary device that functions as a calling speaker and a microphone instead of the calling speaker 17 of the called party's key telephone 21, the calling party's key telephone 20 Calling and...
It is also possible to make a 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 transmitter/receiver 15 of the button telephone 22 is connected to the telephone voice transmission line 26,
Terminal circuit 12A, point 5d of call cross point 5
1 extension circuit 6, and the caller's key telephone 20 is connected in parallel to the extension circuit 6 via the call cross point 5. 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.

Next, the lighting of the lamp (display element) of each button telephone will be described. The status of each station line circuit 3, 4 and extension circuit 6 is given to the common line (bus) 500 in a time-sharing manner, and the necessary blinking cycle is given by the lamp signal generation circuit 400, and the output line 410 receives the time-sharing signal as it is. is output to. Output line 410
are each supplied in parallel to a part of the terminal circuit, 10B, 11B, 12B, and are connected to the lower control signal transmission lines 36, 37, respectively.
, 38, the blinking of each display element 33, 34, 35 is controlled. This will be discussed in detail below.

Figure 2 shows the central office line circuit 3, and the central office line 1
A transformer 51 is provided in the middle of the lines Ll, L2, and a contact HS of the line relay HS is provided on the lines Ll, L2.
l, hS2 are provided.

These contacts HSl, hS2 are small contacts, and a break contact HS3h is located at each make contact HSl, hS2.
The incoming call detection circuit 52 is connected to the incoming call detection circuit 52 via S4, and the output terminal of the incoming call detection circuit 52 is connected to one output terminal of the AND gate 531. On the other hand, the midpoint of the winding on the cross point 5 side of the transformer 51 is grounded via a resistor 53, and the call signal detection circuit 54 and the hold signal detection circuit 5
5 is connected, the output terminal of one detection circuit 54 is connected to the set terminal of the S-R flip-flop circuit 56 with priority to set and one input terminal of the OR circuit 57, and the output terminal of the other incoming call detection circuit 54 is connected to the set terminal of the S-R flip-flop circuit 56. The output terminal of this S-R flip-flop circuit 56 is connected to the other input terminal of the above-mentioned OR circuit 57, and the output terminal of this OR circuit 57 is grounded via the winding of a line relay 58. Each input terminal of the AND gate 57 is connected to one input terminal of the AND gates 532 and 533, and the AND gates 531 and 532
, 533 have a common timing pulse 1.
09 is applied. Furthermore, each AND gate 531, 53
The output end of 2,533 is a common line (bus) 501, 502,
503. The main office line circuit consists of a relay circuit as in conventional multi-wire key telephone equipment. It is slightly different from the station line circuit, but it is the station line 1 (L
1, L2) are separated in terms of DC by the transformer 51, and the secondary side of the transformer 51 (the side without the midpoint) is a DC load for the station line.The transformer 51 corresponds to the conventional H point. This is a signal extracted from the midpoint of the primary side of , and an S-R flip-flop circuit 56 is employed to maintain the hold state. These are the points above. To explain the operation here, firstly, when making a call to the central office line, as described in the explanation of FIG. l of
A speech signal flows from the next midpoint through a terminating resistor 53, is detected by a speech signal detection circuit 54, and its output passes through an OR circuit 57 to operate a line relay 58.

Then, station wire 1 (Ll, L2) becomes relay contact HSl, hS.
2 to the secondary side of the transformer and maintains the central line in a direct current manner. The voice signal is also connected to the call button telephone via a transformer 51. Now, at this time, the output of the call signal detection path 54 is further ANDed with the timing pulse 109 in an AND circuit 532, and the output is outputted to the call common line 502.

Second, when talking about incoming calls from the central office line, firstly, the central office line 1 (Ll, L
2) incoming signal from -7) absorb.

At this time, since the line relay 58 is inoperative, the break contacts HS3 and hS4 are closed, and the incoming call signal D1 is detected by the incoming call detection circuit 52, so that the incoming call signal D1 is detected by the incoming call detection circuit 52, and is used to call the key telephone 40, for example, as described in the explanation of FIG. Performs an incoming call operation on the central office line. Further, the output of the incoming call detection circuit 52 is output from the AND circuit 53.
1 and the AND with the timing pulse 109, and V,
The output is output to the calling common line 501.

When responding to an incoming call, the same operation as in the case of originating from the central office line is performed, and the incoming signal from the central office line is stopped by the response, and therefore, the incoming call is stopped. Thirdly, regarding hold, if you press the hold button on the button telephone in the second call state, the transceiver
At the midpoint of 1, a hold signal is generated in addition to the call signal.

This is detected by the pending signal detection circuit 55, and the S-R flip-flop circuit 56 which gives priority to set is set. S-
The output of the R flip-flop circuit 56 is added to the input of the OR circuit 57. In this state, since the output of the call signal detection circuit 54 has been hot, the output of the OR circuit 57 will not change. Therefore, the line relay 58 is turned on. Continue the condition.
The output of the S-R flip-flop circuit 56 is also ANDed with the timing pulse 109 by the AND circuit 533 and outputted to the common line 503. Note that this state is the same both when the hold button is pressed and when the confidential conversation release button is pressed. Further, when the hold button is released, the call cross point 5 is restored, the connection between the button telephone and the office line is released, and the signal at the primary side midpoint of the transformer 51 disappears. Then, the inputs of the call signal detection circuit 54 and the hold signal detection circuit 55 disappear, and their outputs also disappear. At this time, if an appropriate delay is given to the pending signal detection circuit 55, the S-R flip-flop circuit 56 will maintain the set state because first the set signal disappears and then the set signal disappears. Therefore, the line relay 58 remains in operation through the OR circuit 57, and the station line 1 (Ll, L2) continues to maintain the station line in a direct current manner by the relay contacts HS1, hS2. Now, at this time, the output of the AND circuit 532 which inputs the output of the call signal detection circuit 54 is stopped. Re-response on hold performs the same operation as dialing, but when re-replying, the call signal detection circuit 5
The S-R flip-flop circuit 56 is reset by the output of 4. Because the above operations are performed, the office line circuit 3 performs conventionally known functions, and also sends control signals for calling, talking, and holding of the office line circuit to each common line 501, 502, and 503 in accordance with timing pulses. Output. The state of the station line circuit can be completely known by the above three control signals. This is shown in Table-1. Therefore, three common lines 5
The state of the station line circuit can be known from the signals 01, 502, and 503.

FIG. 3 is a block diagram of the area around the common line of the present invention.
1,542,543 is the logic gate 53 of the station line circuit 3
This is an AND gate in the station line circuit 4 provided corresponding to 1,532,533, and the timing pulse 209 from the timing generation circuit 300 is applied to one input terminal. 501, 502, and 503. One ends of the common lines 501, 502, 503 are grounded via terminating resistors 511, 512, 513, respectively. 400 is a ramp signal generation circuit, which is an AND gate 4
01,403, logic prohibition gate 402, OR gate 4
04, each gate 401, 402, 403
One input terminal of each of the common lines 501, 502, 503
The inhibit terminal of the logical inhibit gate 402 is connected to the common line 503, and the lamp blinking timings 411, 412 from the timing pulse generation circuit 300 are applied to the other input terminals of the AND gates 401, 403. .

The output terminal of this ramp signal generation circuit 400, that is, the output terminal of the OR gate 404, is connected to one input terminal of the OR gates 61b, 62b forming the terminal circuits 10B, 11B. 61a and 62a are call signals given to the terminal circuits 10B and 11B at timings different from the office line and extension lamp signals, and 61c and 62c are call signals to the lower V control signal transmission lines 36 and 37. In the sending circuit, the lamp blinking timings 411 and 412 are set so that, for example, when a call is displayed by blinking at 1Hz and a call is displayed by blinking at 2Hz, a signal of 1Hz is given to 411 and a signal of 2Hz is given to 412. The operation will be explained using the time chart shown in FIG.

A timing pulse 109 is supplied from a timing pulse generation circuit 300 to the office line circuit 3, and a timing pulse 209 is similarly supplied to the office line circuit 4, and each office line circuit 3, 4 adjusts the timing according to its operating state. 3 common lines for calling, talking, and holding for the time determined by the pulse 5
Output signals to 01, 502, and 503. These common lines 501, 502, 503 are connected to terminating resistors 511, 51, respectively.
2,513 and added as an input to the display signal generation circuit 400. Now, for example, when the station line circuit 3 is in the station arrival state, it outputs to the calling common line 501 for the time period of the timing pulse 109.

In addition, in the station arrival state, as shown in Table 1, the common telephone line 502,
It is not output to the hold common line 503. Then, in the display signal generation circuit 400, the time of the timing pulse 109 is output by the AND gate 401 according to the lamp blinking timing 411, and the logic prohibition gate 402 and the AND gate 40
Therefore, the OR gate 404 outputs an output according to the lamp blinking timing 411 during the timing pulse 109. Display signal generation circuit 400
As described above, in response to the common line input, a display as shown in Table 2, which has been conventionally known as a lamp display of a key telephone device, is performed.

Therefore, the operation of the logic gate circuit of the display signal generation circuit 400 is as shown in Table 13.

The output signal 410 of this display signal generation circuit 400 is, after all,
This signal is equivalent to a signal obtained by multiplexing the display signals of each office line and extension line with timing pulses supplied to each office line circuit and extension circuit.

Now, the display signal 410 is given to the terminal circuits 10B, 11B, and 12B, respectively, and is passed through the OR gates 61b, 62b in the terminal circuits 10B, 11B to the sending circuits 61c,
62c, the signal is sent to the lower control signal transmission lines 36 and 37.

The other input terminals of the OR gates 61b and 62b are used to control the button telephones individually, for example, for individual calling, which is different from the common display signal for each of the button telephones. Control signals 61a, 62a necessary for
is given at a timing different from that of the ramp signal.

The time-division multiplexed signals sent from the terminal circuits 10B and 11B to the downlink control signal transmission lines 36 and 37 are transmitted to the serial numbers installed in the button telephones 20 and 21. The signals are converted into a parallel format by a parallel converter (not shown), and then supplied to a plurality of display lamps provided corresponding to each station line circuit and extension circuit. Note that the terminal circuit 1
The control signals 61a and 62a multiplexed with 0B and 11B are subjected to serial-to-parallel conversion and then led to, for example, a drive circuit (not shown) for driving a calling speaker to control the drive circuit for a wall. In the above explanation, the lamp lighting (display) of the extension circuit is not described in detail. Of course, the output 410 also includes an extension lamp (display) signal.

However, in this case, an output indicating that the extension paging circuit is connected is outputted to the calling common line in place of the output of the station arrival detection circuit in the station line circuit.

In addition, if there is no extension secret call or extension hold function, there is no need to connect to the hold common line.

As described above, this key telephone device supplies timing pulses corresponding to each office line circuit and extension line circuit,
It is configured to output to a common line for the time given by the timing pulse according to the control status of each station line circuit and extension line circuit, and furthermore, the output given to this common line is added to the display signal generation circuit. The obtained multiplexed lamp (display) signal is commonly distributed to each terminal circuit, and the blinking of the lamp (display element) of each button telephone is controlled through the lower control signal transmission path.

Since the timing pulse is applied in this way and the output is output to the common line only during that time, it is necessary to have a time division multiplexing modulation circuit in each station line circuit and extension circuit in order to obtain a common multiplexed signal to each terminal circuit. (c) limit v, number of station lines,
Even if the number of extensions increases, there is no need to increase the number of special circuits.Therefore, the configuration becomes simpler. In addition, in order to obtain the signals necessary for lamp (display element) blinking control, the control status of each station line circuit and extension circuit is output to a common line and created using a common logic circuit. There is no need for separate extension circuits, and the configuration is simple in this respect as well.

Furthermore, the signals obtained from each office line circuit and extension circuit to the common line are used as multiplexed signals that are sent directly to the lower D control signal transmission line without any processing on the time axis other than passing through logic gates. obtain. Furthermore, the common lamp (display element) flashing signal for each button telephone, and the (
After separately processing the paging control signal processed by the stock 1, the logical sum of the two is calculated and sent to the lower control signal transmission path, so even if it is the same lower control signal, the content may differ. In this case, it is possible to construct a control circuit in which each of the control signals having a high quality is individually advantageous.

As described above, according to the present invention, display signal control in a button telephone device with a dead line can be realized with an extremely simple configuration.

It goes without saying that the logic circuit portion of the present invention is not necessarily limited to the above embodiments.

As described above, according to the present invention, the main device and the key telephone are connected by a three-pair line, and the main device is provided with a call cross point and a calling cross point independently, thereby making it possible to call an extension during a call. In a pushbutton telephone device, a timing pulse corresponding to each office line circuit and extension circuit is given respectively, and an output corresponding to the state of each office line circuit and extension circuit is outputted to the common line only during this timing pulse. Since the common lamp signal forming circuit is driven by the output of the lamp signal to obtain the lamp signal, it is possible to provide a display signal control method for a button telephone device that greatly simplifies the configuration and control of the lamp control part.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a button telephone device to which the present invention is applied, and FIG. 2 and FIG. 3 are for explaining a display signal control system of a button telephone device according to an embodiment of the present invention.
FIG. 2 is a block diagram of the office line circuit, FIG. 3 is a block diagram around the common line, and FIG. 4 is a timing chart of the configuration shown in FIG. 3. 1, 2... Office line, 3, 4... Office 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, 11B, 12A, 12B...
...Terminal circuit, 13, 14, 15... Transmitter, 16, 17, 18... Output speaker, 20,
21, 22... button telephone, 20S, 21S
, 22S...Button switch, 24, 25, 2
6... Call voice transmission line, 27, 28, 29...
...Call audio transmission line, 30, 31, 32...
・Upper b control signal transmission line, 33, 34, 35...
Display element, 36, 37, 38... Lower b control signal transmission path, 51... Transformer, 52...
Incoming call detection circuit, 53...Resistor, 54...
- Call signal detection circuit, 55... Hold signal detection circuit, 56... S-R flip-flop circuit, 5
7...OR gate, 58...Line relay 400...Display signal generation circuit, 500 common line.

Claims (1)

[Claims] A one-button telephone and a main device are connected by three pairs of lines,
An uplink control signal transmission line and a downlink control transmission line are provided on the three-pair line for transmitting and receiving control signals between the button telephone and the main device by multiplex transmission, and a terminal circuit is provided on the main apparatus as an interface with the three-pair line. A central office line circuit is provided as an interface with the central office line, an extension circuit for internal telephone calls,
Further, in a button telephone device provided with a call cross point for connecting the above-mentioned 3-pair call voice transmission line to a central office line circuit and an extension circuit via a terminal circuit, a timing pulse corresponding to each office line and extension line is provided. means for supplying the plurality of control states of the respective office line circuits and the extension circuits to the plurality of common lines corresponding to the respective control states for the period of the timing pulse; display signal generating means for passing the signals supplied through these common lines through logic gates according to display blinking timings set in advance for each common line, and distributing this output as a display signal to each terminal circuit in common; A display signal control method for a button telephone device, characterized in that: 2 The control status of the station line circuit is the arrival status, call status,
An extension call state corresponding to the control state of the office line circuit is set as the control state of the extension circuit;
On the other hand, three common lines are provided for calling, talking, and holding, and outputs are sent to these three common lines in accordance with each control state during the period when a timing pulse is applied. The output obtained through the logic gate circuit which takes the signals of the three common lines as input and the display blinking cycle of the lamp (display element) of the button telephone as input is distributed to the terminal circuit, and further the output is distributed to the terminal circuit. 2. A display signal control method for a button telephone device according to claim 1, wherein blinking of a display element of the button telephone device is controlled by transmitting the signal to the button telephone device through a communication terminal.