KR20020032900A - A public telephone have voice data multiplexer(vdm) - Google Patents

Abstract

PURPOSE: A public telephone having a voice data multiplexer is provided to prevent a public telephone line from being illegally used by mounting a voice data multiplexer to a public telephone, by detecting a specific signal and by judging whether a call is performed through a normal line. CONSTITUTION: A voice data multiplexer(21M) separates a specific data signal from an inputted signal and outputs the signal separated. A speaking circuit unit(214) respectively receives voice signals separated from the voice data multiplexer(21M) and inputted from a telephone. A charging signal detection unit(215) detects and outputs a charging signal for imposing telephone charges in case that a telephone call is normally performed. A central control unit(211) inputs/outputs all sorts of signals from each unit and judges whether the telephone call is normally performed. An LCD control unit(213) processes signals for displaying all sorts of speaking phases from the signals inputted from the central control unit(211). An LCD(212) receives the signals from the LCD control unit(213).

Description

Public telephone with voice data multiplexer {A PUBLIC TELEPHONE HAVE VOICE DATA MULTIPLEXER (VDM)}

The present invention relates to a public telephone. In detail, a voice data multiplexer (VDM) is mounted on a public telephone to prevent fraudulent use of public telephone lines and display messages in real time. It is about a public telephone which can be.

The data transmission method that has been developed with the development of science and technology has been continuously developed to solve a one-to-one transmission problem through a telephone line and to transmit a large amount of data including multimedia data at high speed. Among these various transmission methods, research and development on data communication using public enterprise communication network (CO-LAN) are being actively conducted.

Public enterprise communication network (CO-LAN) is a communication network that can transmit and receive voice and data at the same time by installing voice and data multiplexing devices (VDM) on a general telephone line, and is a corporate computer network data communication service mainly used by corporate customers.

In addition, the voice and data multiplexing device (VDM) refers to a device capable of realizing voice information and various data on a single line. The VDM equipment is an advanced product capable of improving line efficiency due to its excellent voice and data compression function.

1 is a schematic diagram of a public telephone for explaining a conventional communication form and method.

As shown in the drawing, a conventional telephone call system is a system in which a public telephone 11 commonly used and a switch 12 in a communication building are directly connected. There are many types of methods, but nowadays, almost all of them adopt digital methods according to the digital trend. In addition, the telephone number dialed in the public telephone during the call with the outside is connected through the exchange to make a call.

However, the conventional communication method as described above has the following problems.

As described above, the conventional scheme generally takes the form of a direct connection between the exchange 12 and the public telephone 11. Therefore, the conventional communication method has a disadvantage in that it is possible to make a call when another telephone is connected in parallel to a public telephone line, and thus cannot solve the problem caused by the illegal use of the telephone line.

Accordingly, an object of the present invention for solving the above-described problems is to install a voice and data multiplexing device (VDM) in a general public telephone, thereby preventing a fraudulent use of the public telephone line and displaying a message in real time. To provide a technology for a public telephone with a built-in data multiplexing device.

1 is a schematic diagram of a public telephone for explaining a conventional communication form and method.

Figure 2 is a connection state diagram of a public telephone with a built-in voice data multiplexing device according to an embodiment of the present invention.

Figure 3 is a block diagram of a public telephone with a built-in voice data multiplexing device according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

21: public telephone 21M: voice data multiplexing device (VDM)

211: central control unit 212: LCD

213: LCD control unit 214: call circuit unit

215: billing signal detection unit 22: public enterprise communication network

23: exchange 24: server

A public telephone having a voice data multiplexing device according to the present invention for achieving the above object,

A voice data multiplexing device that separates and outputs a voice and a specific data signal from an input signal; A call circuit unit for receiving a voice signal separated from the voice data multiplexing device and a voice signal input from the telephone, and processing a signal to enable a call; A charging signal detection unit for detecting and outputting a charging signal for charging a telephone charge from a telephone call state when the telephone call is normally performed; A central control unit for inputting and outputting various signals from each component of the telephone to determine whether the telephone call is normal and to maintain the call, and to manage and control a call state to enable the call; An LCD controller which processes a signal to display various call states from the signal inputted from the central controller; And an LCD that receives a signal from the LCD control unit and displays a call state and various control states.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating a connection state of a payphone incorporating a voice data multiplexing apparatus according to an embodiment of the present invention, and FIG. 3 is a block diagram of a payphone incorporating a voice data multiplexing apparatus according to an embodiment of the present invention. to be.

First, and in the connection form of this embodiment, as shown in Fig. 2, a public telephone 21 equipped with a VDM device is connected to a public enterprise communication network 22 (CO-LAN). The switch 23 and the server 24 are connected to the other side of the public enterprise communication network 22 and COLAN, respectively.

The VDM is connected to the public enterprise communication network 22 (COLAN). In the description of this embodiment, the VDM connected to the public enterprise communication network 22 (COLAN) is divided into CO_VDM, and the VDM connected to the public telephone is divided into R_VDM 21M.

As shown in Fig. 3, the public telephone 21 of the present embodiment first includes a central control unit 211 for managing and controlling all states such as communication status. The central control unit 211 is connected to the LCD 212 and the LCD control unit 213, the other is connected to the call circuit unit 214, charging signal detection unit 215, respectively, R_VDM for signal input and output of the public telephone 21M is connected.

2 and 3, it is important that the voice and data multiplexing device (VDM) is included in a public telephone and used. As described above, the VDM is a device that can independently use voice and data simultaneously by using a frequently used voice frequency band (300 Hz to 3400 Hz) and an information data band (40 Hz to 110 Hz). In the present invention, the VDM device 21M is used to transmit a specific signal and various necessary data for illegally determining the public telephone line.

First, the server 24 shown in FIG. 2 performs a function of storing and managing text or multimedia data. A public telephone 21 with a VDM 21M and a server 24 are respectively connected to the public enterprise communication network 22 (COLAN). The other side of the public enterprise communication network 22 (CO_LAN) is connected to a telephone station or a base station switch 23.

In this embodiment, since the server 24 is used, the public enterprise communication network 22 (COLAN) is used. However, when only the public telephone 21 is used without using the server 24 or other peripheral devices, the public public line is used. May be used. In addition, the present invention may be used by connecting various peripheral devices to the public enterprise communication network 22 (CO_LAN) in addition to the server 24 shown in FIG.

In the public telephone shown in Fig. 3, the VDM 21M is a portion connected to the public telephone lines 22 and C0_LAN, and is provided with a voice port and a data port, respectively. Since the VDM 21M includes a filter and various circuits for separating the voice data and the information data, respectively, various data can be input and output.

Among the data separated by the VDM 21M, the voice data is transmitted to the call circuit unit 214 and the charging signal detection unit 215, and the information data is transmitted to the central control unit 211, respectively. The call circuit unit 214 modulates and demodulates the external voice data inputted from the public telephone line and the voice data inputted from the public telephone caller, and transfers the data to the central control unit for the caller and to the VDM 21M for export to the outside. Play a role of

The charging signal detection unit 215 processes signals related to charges such as call charges and remaining charges. The contents of the call state and billing information processed by the call circuit unit 215 and the information data separated from the VDM 21M are transmitted to the central control unit 211.

The central controller 211 processes the input call state and text data and transmits the received call state and text data to the LCD controller 213. The LCD control unit 213 processes the data transmitted from the central control unit 211 as data that can be visually shown, and transmits the data to the LCD 212, and the LCD 212 controls the adjustment state of the telephone call, the current call state, and the telephone. Various states such as line connection status are displayed.

In addition, the public telephone 21 of the present embodiment determines whether the current call state is a call through a formal line or is connected in a negative way through detection of a specific signal included in voice data and information data. If a specific signal is not detected, the call is regarded as being used through a negative connection and the call is blocked. Therefore, the present invention has the effect of preventing the illegal use of public telephone lines.

According to the present invention, after a voice and data multiplexing device (VDM) is installed in a public telephone, whether or not to maintain the call by determining whether the call state is through a formal line or through a negative method through the detection of a specific signal is present or not. Determine. Therefore, the present invention provides an effect of preventing the illegal use of public telephone lines.

Claims (2)

In the phone, A voice data multiplexing device that separates and outputs a voice and a specific data signal from an input signal; A call circuit unit for receiving a voice signal separated from the voice data multiplexing device and a voice signal input from the telephone, and processing a signal to enable a call; A charging signal detection unit for detecting and outputting a charging signal for charging a telephone charge from a telephone call state when the telephone call is normally performed; A central control unit for inputting and outputting various signals from each component of the telephone to determine whether the telephone call is normal and maintaining the call, and for managing and controlling a call state to enable the call; An LCD controller which processes a signal to display various call states from the signal inputted from the central controller; And, And an LCD for receiving a signal from the LCD control unit and displaying a call state and various control states. The method of claim 1, wherein the specific data signal is A public telephone having a built-in voice data multiplexing device, characterized in that it is a specific signal used as a material for determining whether or not the call state is normal.