JPS6170893A - Signal converting device - Google Patents

Abstract

PURPOSE:To connect a two-wire system telephone set to a key telephone set system by converting a signal between a data signal of the key telephone set system and a condition signal of a two-wire system telephone set. CONSTITUTION:A main device 5 is connected to telephone lines 1-1 and 1-2. To the device 5, key telephone sets 6 and 7 are connected and an ordinary telephone set 9 is connected through a signal converting device 8. Wirings 2-1 and 2-2 use lines 1-1 and 1-2 and are used at the time of calling the external part. Wirings 3-1 and 3-2 are used at the time of calling the extension between telephone sets 6 and 7 or between the telephone sets 6 and 7 and a telephone set 9.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a signal conversion device for a button telephone system, and particularly relates to a signal conversion device for a button telephone system to which a normal two-wire telephone can be connected. .

[Conventional technology]

Conventional key telephone systems can only be connected to key telephones designed specifically for the system.

[Problem that the invention seeks to solve]

Therefore, there is a drawback that it is not possible to connect a commonly used two-wire telephone, such as a decorative telephone, directly to a telephone line.

In view of the above points, the present invention has been made to solve such problems and eliminate such drawbacks, and its purpose is to connect an ordinary two-wire telephone to a button telephone system by simple melting. The object of the present invention is to provide a signal conversion device that can perform the following steps.

[Means for solving problems]

In order to achieve such an object, the present invention provides a data modulation/demodulation circuit for modulating/demodulating control data signals and transmitting/receiving data with the main device of a key telephone system, and a data modulation/demodulation circuit for detecting on-hook/off-hook of a telephone and the like. A status monitoring circuit for identifying the dial signal sent from the telephone and monitoring the status of a two-wire telephone that can be directly connected to a telephone line, and a state monitoring circuit for communicating with the outside via the telephone line or for wiring. and a control circuit for controlling the data modulation/demodulation circuit, the status monitoring circuit, and the communication path switching switch, and the status monitoring circuit. The output of the above is transmitted to the main device via the control circuit and the data modulation/demodulation circuit, and the communication path between the main device and the Type 21 telephone can be set by the communication path changeover switch. It is.

[Function] The output of the status monitoring circuit is transmitted to the main device via the control circuit and the data modulation/demodulation circuit, and the communication path between the main device and the two-wire telephone can be set using the communication path changeover switch.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

First, before describing embodiments, a button telephone to which the present invention is applied will be described in order to facilitate understanding of the present invention.

FIG. 1 is a block diagram showing an example of the overall configuration of a key telephone system to which the present invention is applied.

In the figure, 5 is a main device connected to the telephone line 1-1.1-2, a button telephone 6.7- is directly connected to this main device 5, and a normal telephone is connected via a signal conversion device 8. When the telephone 9 has made a call to the outside using the telephone line 1-1. You can make internal calls between. In this case, as the telephone 9, the telephone line 1-1.1-
There is no problem with any normal two-wire telephone that can be used by directly connecting to the telephone.

In addition, 2-1.2-2 is the wiring A used when talking to the outside using the telephone line 1-1.1-2, and 3-1.3-2 is the wire A used for talking to the outside using the telephone line 1-1.1-2. This is the wiring B used when making an extension call between the button telephones 7 or between the button telephones 6 or between the button telephones T and the telephones 9.

The wiring 3-1, 3-2 includes a direct current power supply (not shown) necessary for operating the button telephone 6.7, the signal conversion device 8, and the telephone 9, as well as the main device 5. data signals are superimposed. 4-1.4
-2 is a wiring C that transmits a data signal.

Now, the present invention is implemented as follows. "FIG. 2 is a block diagram showing an embodiment of the signal conversion device according to the present invention, and shows an extracted portion of the signal conversion device 8 in FIG. 1.

In Fig. 2, the same numbers as in Fig. 1 indicate corresponding parts, and 11 is used to close/open the circuit of wiring A 2-1 and 2-2 when communicating with the outside via the telephone line. 12 is a low-pass filter for passing a call signal of 3 kHz or less when making an extension call using wiring B 3-1.3-2; 13 is shown in FIG. A high-pass filter 14 is used to pass control data signals of 3 KHz or higher between the main device 5 and the main device 5. A high-pass filter 14 modulates/demodulates the control data signals in the high-pass filter 13 and transmits the data between the main device 5 and the main device 5. A data modulation/demodulation circuit 15 is used to send and receive data, and a power supply separation circuit (low-pass filter), 16 communicates with the outside via a telephone line, or 3-1.3- of wiring B.
2 is the call route changeover switch for selecting whether to make an extension call and setting the call route; 17 is the 16H switch for the telephone;
A signal generation circuit 18 is a two-wire type that can detect on-hook/off-hook of the telephone, identify dial signals of intermittent DC or multi-frequency signals sent from the telephone, and connect directly to the telephone line. A status monitoring circuit for monitoring the status of the telephone, 19 a current supply circuit for supplying current to the telephone, 20 each of the above circuits, namely, a line control circuit 11, a data modulation/demodulation circuit 141, a communication path changeover switch 16, and Condition monitoring circuit 18
This control circuit 20 is configured on a computer.

Next, the operation of the embodiment shown in FIG. 2 will be explained with reference to FIG. In the following explanation, in order to make the operation easier to understand, an example will be explained in which a call operation is performed from a telephone and a call is made to an external party via a telephone line.

First, when the telephone is off-hook to make a call, the DC circuits 4-1 and 4-2 of wiring C are closed and current flows, so the status monitoring circuit 18 detects this and the control circuit 2
Tell 0. This control circuit 20 is a data modulation/demodulation circuit 14
．． 3-1.3 of wiring B using high-pass filter 13
-2 to the main device 5 shown in FIG. 1, which indicates that the telephone line will be used. Then, if the telephone line is not in use, this main device 5 sends "use permission" data and at the same time seizes the telephone line and wires A.
2-1.2-2.

Next, the 1 control circuit 20 operates the line control circuit 11 and the communication path changeover switch 16 to connect the wiring person 2-1.2-2 and the wiring C 4-1.4-2. The operator of the telephone hears a dial tone from the telephone line and performs a dialing operation. Then, a dial signal based on this dial operation, for example, a DC intermittent signal, that is, a dial pulse, is identified by the status monitoring circuit 18 and sent to the control circuit 20, and further sent as data to the main device 5 shown in FIG. . Then, a dial sending circuit (not shown) built into the main device 5 sends a dial signal based on the above data to the telephone line.

After the telephone line is acquired and the dialing operation is performed in this manner, a call is started.

When the telephone call ends and the telephone enters the on-hook state, the status monitoring circuit 18 detects this and transmits this to the main device 5 of FIG. 1 via the control circuit 20 to open the telephone line.

Thus, a conventional two-wire telephone can be connected to the key telephone system.

〔Effect of the invention〕

As can be seen from the above description, according to the invention, a simple circuit is provided to perform the conversion between the data signals of a pushbutton telephone system and the status signals of a two-wire telephone without the use of complex means. The configuration allows a two-wire telephone to be connected to the key telephone system, so the practical effect is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the overall configuration of a key telephone system to which the present invention is applied, and FIG. 2 is a block diagram showing an embodiment of the signal conversion device of the present invention shown in FIG. 5...Main device, 14...Data modulation/demodulation circuit, 1
6. Communication path changeover switch, 18. Condition monitoring circuit, 20. Control circuit.

Claims (1)

[Claims] In button telephone systems, modulation of control data signals/
A data modulation/demodulation circuit for performing demodulation and exchanging data with the main device of the key telephone system, detecting on-hook/off-hook of a telephone, identifying a dial signal sent from the telephone, and connecting directly to a telephone line. A status monitoring circuit for monitoring the status of a two-wire telephone, and a call path switch for setting a call path by selecting whether to make a call to the outside via the telephone line or to make an internal call via the wire. a switch, and a control circuit for controlling the data modulation/demodulation circuit, the status monitoring circuit, and the communication path changeover switch, and transmitting the output of the status monitoring circuit to the main device via the control circuit and the data modulation/demodulation circuit. A signal conversion device characterized in that the communication path changeover switch is capable of setting a communication path between the main device and the two-wire telephone.