JP2528001Y2 - Telephone paging broadcasting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to an apparatus for performing paging broadcast from a telephone.

<Prior Art> A conventional paging broadcast device incorporates a paging unit 3 in a main device 2 for connecting a telephone 1 as shown in FIG. 2, and inputs a paging amplifier 4 to a signal line and a control line of the paging unit 3. The circuit and the remote circuit were connected. Incidentally, the paging unit 3 incorporated in the main device 2 has a different circuit configuration for each manufacturer, and therefore the signal levels of signal lines and control lines, output impedance, and the structure of connection terminals are different. Therefore, the paging amplifier 4 has a signal level and impedance switching circuit so that it can be connected to the paging unit of each manufacturer.

Further, in recent business telephones, a paging broadcast is performed by inputting a special code number for paging broadcasting from a telephone at the time of paging broadcasting, and cannot be easily operated. Also, when connecting a paging amplifier with a talkback function to the paging unit, the signal level and circuit impedance of the talkback circuit differ for each manufacturer, and it was necessary to prepare a talkback amplifier for each model or provide a switching circuit. . When the paging unit 3 is a one-way type, talkback cannot be performed.

<Object of the Invention> The purpose of the present invention is to solve the above-mentioned problems of the conventional device.

An object of the present invention is to provide a configuration that enables paging broadcasting without using a paging unit of a telephone main unit. Therefore, the paging unit can be eliminated.

An object of the present invention is to provide a paging broadcast from a telephone using a telephone main unit of all manufacturers only by preparing one kind of paging amplifier. Therefore, a switching circuit and the like become unnecessary, and the cost can be reduced.

It is another object of the present invention to enable paging broadcasting only by operating an external line selection switch, thereby simplifying the operation.

<Structure of the invention> The invention is configured by connecting a paging amplifier to one external line terminal of a telephone main unit via an external line connection adapter. The signal level, circuit impedance, terminal structure and other specifications of the external line terminal of the telephone main unit are almost unified by technical standards, there is little difference between manufacturers, and only one type of external line connection adapter is required.

The external line connection adapter includes a signal line and a control circuit for controlling activation and termination of the paging amplifier.

<Embodiment> An extension terminal of a telephone main unit 11 comprising a key telephone such as a business telephone and capable of mutually connecting and connecting a plurality of private telephones and a plurality of external lines connected to a central office, is provided. The telephones 12a, 12b,... Are connected, and a plurality of external lines 13a, 13b,.
The external line connection adapter 14 is connected to an arbitrary empty terminal of the external line terminal, for example, 13c. External line connection adapter 14, transformer 15,
Current detection circuit 16, switch circuit 17, constant voltage power supply circuit 18,
It comprises a signal line terminal 19 and a control line output terminal 20. The input circuit terminal 22 of the paging amplifier 21 is connected to the signal line terminal 19. The remote terminal of amplifier 21
23 is connected to the control line output terminal 20. A broadcast speaker 24 is connected to an output terminal of the amplifier 21. FIG. 3 shows a detailed view of the external line connection adapter 14. 3, the same parts as those in FIG. 1 are denoted by the same reference numerals.

The device of the present invention is configured as described above and operates as follows.

When it is desired to perform paging broadcast from an arbitrary slave telephone set, for example, from the slave telephone set 12a, an external line terminal 13c to which an external line connection adapter 14 for paging broadcast is connected is selected by an external line selection button switch (not shown) of the slave telephone set 12a. Then, a current loop is closed between the slave telephone 12a and the external line connection adapter 14 via the external line terminal 13c, so that a DC current flows through the transformer 15. The current detection circuit 16 detects a DC current flowing through the transformer 15, and turns on the switch circuit 17. The paging amplifier 21 is activated via the control line output terminal 20 by the ON operation of the switch circuit 17. Thus, the paging amplifier 21 completes the preparation operation. Subsequently, the broadcast signal supplied from the mouthpiece of the slave telephone 12a is input to the input circuit 22 of the paging amplifier 21 through the external terminal 13c of the telephone main unit 11, the transformer 15, the signal line terminal 19, and is amplified. Paging broadcast is performed from the speaker 24.

In the configuration of the present invention, since the paging amplifier 21 has a talkback function, the output of the amplifier 21 is supplied from the telephone main unit 11 to the slave telephone 12a via the transformer 15 of the external line connection adapter 14 and the external terminal 13c. Therefore, talkback is performed.

Then, when the handset of the slave telephone set 12a is placed after the paging broadcast and the talkback are completed, the current loop is opened. Therefore, the current detection circuit 16 turns off the switch circuit 17. Therefore, the operation of the paging amplifier 21 is stopped.

In the present invention, the current detection circuit 16, the switch circuit 17,
The constant voltage power supply circuit 18 may be any control circuit that turns on and off the power supply circuit of the paging amplifier 21, and can be changed to a circuit other than the above embodiment.

<Effects of the Invention> The present invention does not connect a paging amplifier to a paging unit with a different connection specification for each manufacturer, but instead connects an external line connection adapter to an external terminal with almost uniform connection specifications. Since the paging amplifier is connected via a telephone line, any type of telephone main unit can be configured using one type of external line connection adapter and paging amplifier. Therefore, paging broadcasting can be performed without using the paging unit of the telephone main unit. In addition, a single type of external line connection adapter and paging amplifier can be connected to the telephone main unit of any manufacturer, eliminating the need to prepare an amplifier corresponding to each manufacturer or providing a switching circuit, thereby reducing costs. Can be.

Moreover, according to the present invention, when performing paging broadcasting,
It is only necessary to operate the external line selection button switch for selecting an external line terminal connecting the external line connection adapter for paging broadcast from the slave telephone, and the operation of inputting the code number for paging broadcast from the telephone as in the conventional case can be omitted. .

Further, in the present invention, the paging amplifier has a talkback function, and the output of the amplifier is supplied to the private telephone through the external line connection adapter, the external line terminal, and the telephone main unit.
You can talk back.

[Brief description of the drawings]

FIG. 1 is a block diagram of a paging broadcast device according to an embodiment of the present invention, FIG. 2 is a block diagram of a conventional paging broadcast device, and FIG. 3 is a circuit diagram of an external line connection adapter constituting a main part of the present invention. . 11 Main device, 12 Telephone 13 External line terminal, 14 External line connection adapter 21 Paging amplifier

Claims (2)

(57) [Scope of request for utility model registration] 1. A plurality of private telephones (12a, 12b, 12c);
A telephone main unit (11) for mutually connecting and switching a plurality of external lines, a plurality of external line terminals (13a, 13b, 13c) connected to the telephone main unit (11), and a transformer ( 15) The audio signal line (22) of the paging amplifier (21) via means for separating the current loop and the audio signal, such as
An external line connection adapter (14) connected to a current detection circuit (16) to one of the external line terminals, and further connected to a control line (23) of a paging amplifier via a switch circuit (17); A speaker (24) connected to the output side of the paging amplifier, and when the local telephone and one of the external line terminals are connected by an external line selection button switch provided on the selected local telephone,
A power activation signal of a paging amplifier is turned on by an output of the control line, a paging broadcast is performed via the external line connection adapter and the paging amplifier, and a power activation signal of the paging amplifier is stopped when the local telephone is on-hook. Paging broadcast device for telephones. 2. The system according to claim 1, wherein said paging amplifier has a talkback function, and an output of said paging amplifier is supplied to said private telephone via said external line connection adapter, external line terminal and telephone main unit. A paging broadcast device for a telephone as described in the above.