JPS6360691A - Key telephone system - Google Patents

Abstract

PURPOSE:To control a radio terminal station without using a control line by detecting the ON/OFF of a direct current loop installed between a key telephone set main body and a hand set, and generating a sine wave signal for controlling the radio terminal station. CONSTITUTION:The key telephone set main body 20 is provided with a direct current superimposing circuit 21 for superimposing a direct current of a transmission line between the hand set, and with a direct current detection circuit 22 for detecting the ON/OFF of the direct current loop which includes the PTS 13 of the hand set 10. When the PTS13 is depressed at the time of a calling, the circuit 22 detects it and is transmitted to an APU24. Data inputted to the APU24 are inputted to an NPU32 through the KPU34 of a main equipment 30, and the NPU32 transmits a control signal to a radio 1/F unit 31. The unit 31 generates the sine wave signal for controlling the radio terminal station 50, and outputs it to a COP 33, and the sine wave signal, being superimposed on a voice, is transmitted to the terminal station 50. Thus, the radio terminal station can be controlled without using the control line.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to press-to-talk
) Relating to a button telephone device having the following functions.

BACKGROUND OF THE INVENTION FIG. 5 shows a conventional telephone device, in which 1 is a handset equipped with a press-to-talk switch f1a, 2 is an individual telephone with the handset 1, and 3 is a pair of control lines for each press-to-talk switch 1a of the individual telephone 2. 4 is a private branch exchange to which the telephone 2 and the sine wave signal generator 3 are connected via a communication path, and 5 is a private branch exchange in the premises. This is a wireless terminal station connected to the exchange 4 via a wireless dedicated line.

In the above configuration, when the press talk switch 1a is turned on, the sine wave signal generator 3 detects this and generates a sine wave signal for controlling the wireless terminal station 5. This sine wave signal is converted into an audio signal (double signal) and sent to the communication path, private branch exchange 4, and wireless dedicated line, and the wireless terminal station 5 detects this sine wave signal and enters the transmitting state.

Problems to be Solved by the Invention However, in the above conventional telephone device, the single telephone 2
There is a problem in that a pair of control lines is required for each telephone between the telephone and the sine wave signal generator 3.

Furthermore, since a stand-alone telephone is used, there is a problem in that the service of a key telephone cannot be received.

In view of the above problems, the present invention does not use a control line,
It is an object of the present invention to provide a button telephone device which can be controlled as a wireless terminal station and can receive the services of a button telephone.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a direct current loop in the transmission path between the key telephone body and the handset, which is turned on and off by the press talk switch of the handset. The device is configured to generate a sine wave signal for controlling a wireless terminal station by detecting whether the loop is on or off.

OPERATIONS With the above-described configuration, the present invention can control a wireless terminal station without using a control line between the press-to-talk switch of the handset and the sine wave signal generation circuit, and can also receive key telephone service.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the button telephone device according to the present invention, FIG. 2 is a more detailed circuit diagram of the button telephone device of FIG. 1, and FIG. 3 is a wireless interface diagram of the button telephone device of FIG. FIG. 3 is a more detailed block diagram of the foos unit.

In FIG. 1, 10 is a handset, 20 is a key telephone body equipped with a handset, 30 is a main device to which the key telephone body 20 is connected, 40 is a private branch exchange to which the main device 30 is connected, and 50 is a wireless dedicated line. This is a wireless terminal station connected to the private branch exchange 40 via the private branch exchange 40.

As shown in detail in FIG.
1 is press talk switch? (PTS) 13 are connected in parallel, and a DC blocker capacitor C1 is connected in series to prevent direct current superimposed on the transmission path from affecting transmission system elements.

As shown in FIG. 1, the button telephone main body 20 includes a DC superimposition circuit 21 for superimposing DC on the transmission path with the handset 10, and a circuit for detecting on/off of the DC loop including the PTS 13 of the handset 10. DC detection circuit 22
, a communication circuit network 23 for 2-wire to 4-wire conversion, and a microcomputer (APU) 24 for controlling the operation of the button telephone 10.20.

As shown in detail in FIG. 2, the button telephone main body 20 also has a power terminal A connected to one of the PTS 13 of the handset 10, and a photocoupler for detecting on/off of the DC loop to the other. (PH)22a
are connected to constitute the DC superimposition circuit 21 and the DC detection circuit 22 shown in FIG. 1, respectively. Note that C2 is a DC blocking capacitor, and VA is a varistor that reduces the click noise generated when the PTS 13 is turned on/off.

As shown in FIG. CPU unit (NP
U) 32, a central office line unit (COP) 33 for connecting the general subscriber line and the wireless dedicated line, and each button telephone 1.
Telephone unit for connecting 0.20) (KPU)
It is roughly composed of 34.

As shown in detail in FIG. 3, the wireless I/F unit 31 of the main device 30 includes a circuit 31a that generates a sine wave for controlling the wireless terminal station 50, and a sine wave signal from the circuit 31a and a sine wave signal from the NPU 32. A link switch 31b is used to superimpose the control signal on the communication path, and a low-pass filter (L
PF) 31C and the handset l due to the sidetone when sending a call.
A low pass filter (LPF) 31d for cutting the control signal heard from the receiver 12 of
It is composed of communication circuit networks 31d and 31e connected to U34 and C0P33 to perform 2-wire to 4-wire conversion.

Next, the operation of the embodiment according to the above configuration will be explained.

In FIG. 2, the PTS of the handset 10 when sending a call
When 13 is pressed, PTS13, PH2 from power terminal A
2a, a DC loop is formed to GND, p, 122
a detects that this DC loop is on and transmits it to the APU 24.

The data input to the APU 24 is as shown in Figure 1.
The signal is input to the NPU 32 via the KPU 34 of the main device 30, and the NPU 32 sends a link switch control signal to the wireless I/F unit 31.

As shown in FIG. 3, in the wireless I/F unit 31, the zinc switch y-31b is turned on, and the signal from the sine wave signal generation circuit 31a is output to the COP 33 via the link switch 31b and the communication circuit network 31e. , is sent to the central office line communication path to which the wireless line is connected. Therefore, the sine wave signal is superimposed on the voice and sent to the wireless terminal station 50.

On the other hand, if the PTS 13 turns off when going to receive a call, the DC loop is disconnected, the PH 22a detects this, and the A
Inform PU24. In response to this, the NPU 32 turns off the link switch control signal, and the wireless I/F unit 31 stops sending out the sine wave signal to the office line communication path.

In addition, when making a call on a central office line or an extension call (other than a call over a wireless line), even if the PTS 13 is turned on, the program can be protected so that there will be no effect such as call disconnection. In addition, since the main device 30 accommodates a general subscriber line and a dedicated wireless line, it is possible to identify the line by program so that only the dedicated wireless line (: a sine wave signal is sent out). It is configured.

As explained above, according to the above embodiment, when the PTS 13 is turned on when transmitting a call via the wireless dedicated line, the wireless I/F unit 31 in the main device 30 converts the sine wave signal into audio (
The wireless terminal station 50 can be controlled to double-fold and transmit.

FIG. 4 shows a second embodiment of the present invention, in which the same members (2 are given the same reference numerals) as those in FIGS. 1 to 3.

In FIG. 4, 10.20 is the same handset and key telephone body as in FIG. It is a switchboard and a wireless terminal station.

The main device 60 in this embodiment includes a CPU unit (NPU) 32, a central office line unit (COP) 33, and a telephone unit (KPU) 34, which are similar to those in the previous embodiment.
It also has an external sine wave signal generation circuit 31a that sends out an earth signal using a relay control signal from the NPU 32.
The wireless interface (I/F') unit 61 includes a relay 61a that activates the wireless interface (I/F').

In this embodiment, when the PTS 13 of the handset 10 is turned on, the DC detection circuit 22 (PH 22a) and APU 24 of the telephone main body 20 detect this and notify it to the NPU 32 of the main device 60, and the NPU 32 detects this as in the previous embodiment. A relay control signal is sent to the wireless I/F unit 61.

The wireless I/F unit 61 sends a ground signal to the sine wave signal generation circuit 31a, and the circuit 31a receives the ground signal, generates a sine wave signal, superimposes it on audio, and sends it to the central line communication path. . On the other hand, when PTS 13 is turned off, earth air is disconnected.

According to the above embodiment, it is possible to house a wireless line and a general subscriber line in the same key telephone, and it is possible to receive various services of the key telephone.

Note that, as in the first embodiment, when the main device 30 includes a built-in wireless I/F unit 31 that generates a sine wave signal, the conventional sine wave signal generation circuit 3 (FIG. 5) is unnecessary. Furthermore, when the main device 60 has a built-in wireless 1/F unit 61 that generates an earth signal as in the second embodiment, the existing sine wave signal generation circuit 3 can be used.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention has a direct current loop that is turned on and off by a press talk switch of the handset, and detects whether the direct current loop is turned on or off. Since the configuration is configured to generate a sine wave signal for controlling the wireless terminal station, there is a connection between the press talk switch of the handset and the sine wave signal generation circuit (-- it is possible to control the wireless terminal station without using a control line). You can also receive key telephone service.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the button telephone device according to the present invention, FIG. 2 is a more detailed circuit diagram of the button telephone device of FIG. 1, and FIG. 3 is a wireless interface diagram of the button telephone device of FIG. Fu-
FIG. 4 is a block diagram showing a second embodiment of the present invention, and FIG. 5 is a block diagram showing a conventional example. 10...handset, 11...telephone, 13...
・Press talk switch (PTS), 20... Button telephone body, 21... DC superimposition circuit, A... Power supply terminal, 22... DC detection circuit, 22a... Photocoupler (PH), 24・・・Microcomputer (APU)
), 30.60...Main device, 31.61...Wireless interface (I/F) unit, 31a...Sine wave signal generation circuit, 32...CPU unit (NPU)
, 50... Wireless terminal station. Name of agent: Patent attorney Toshi Nakao
2 d

Claims (1)

[Claims] The transmission path between the button telephone body and the handset is equipped with a DC loop that is turned on/off by the handset's press talk switch, and a sine wave signal is used to control the wireless terminal station by detecting the on/off state of the DC loop. A button telephone device characterized by generating.