KR200225539Y1 - Adapter for phone - Google Patents

Abstract

The present invention relates to a telephone adapter, comprising: an interface unit for interfacing a dial signal and a voice signal input and output from one of a telephone station line and a telephone, and an AC voltage output from the interface unit in a telephone connected from a telephone line. A voltage rectifying unit for rectifying the voltage, a dial signal decoding unit for recognizing the dial signal outputted from the interface, and decoding the dial; and a signal applied from the dial signal decoding unit, comparing the reference signal with a reference signal, and calculating and applying the same. A control unit for determining the property of the received signal, a switching unit for switching the voltage rectified from the constant voltage unit based on the first output signal determined by the control unit, and a current voltage applied from the switching unit to a voltage having a predetermined magnitude. Keep constant and call the phone A constant voltage unit for generating a signal, a melody sound generation unit for generating a melody sound for notifying a user of an eavesdropping state based on the second output signal determined by the control unit, and storing, withdrawing and outputting data input from the control unit Memory section is included. This prevents unauthorized eavesdropping and theft of the telephone 20 and enables the setting of a call right.

Description

Adapter for phone

The present invention relates to a telephone adapter (Adapter), and more particularly to a telephone adapter having a function such as to prevent eavesdropping during the call, restrict the use of the telephone.

Conventional telephone system is one of the terminals to transmit the voice signal to the predetermined distance by wire through the telephone office and the relay station, and can be omitted from the modern life which is essential in the home, office or business office. There is no transmission medium.

Such a telephone is intended to be shared by several people, and when a handset is picked up, the telephone can be started by a voltage applied from a telephone line and can hear a dial tone transmitted from the telephone station. At this time, when the user dials a desired telephone number, a dial tone (dual tone signal) is generated from the telephone to make a voice call by calling a subscriber of the telephone number dialed through a relay station or a telephone station through a telephone line.

In addition, the telephone line connected to the telephone may be connected to a communication device such as a facsimile or a computer as well as the telephone to transmit and receive data.

On the other hand, the telephone used to connect to the telephone line has emerged a telephone having a variety of functions, such a telephone is used for various purposes by recording a voice message or connected to a computer or home appliances. A telephone can be used by connecting several telephones to a single trunk line, and when more than a certain number is required, a separate control device is required. In case of using several telephones without connecting the control device, it is impossible to make a good call because of voltage drop or noise mixed by leakage current.

Such conventional telephones are used by many people in a business office or office, or by a family member in the home using one or more telephones, especially in the case of a telephone installed in a place such as a business office or office. Unauthorized subscribers have the problem of making long distance calls, international calls, or using information. Thus, subscribers are inconvenient to spend many direct unused phone bills.

In addition, it is possible to eavesdrop private telephone conversations by connecting a separate telephone to a telephone line of one line without permission or by using multiple telephones connected to a telephone line of a line. There are many problems with the security of landline phones.

The present invention has been made in order to solve the above problems, by connecting an additional device between the telephone line and the telephone line can detect the unauthorized tapping by connecting the telephone and telephone line to the telephone line, international calls In addition, it is possible to block long distance calls or information use, and to set the calling area with a simple operation, and to use a telephone adapter to facilitate password entry and password change to restrict the use of the telephone. To provide, the purpose is.

1 is a block diagram of an adapter for a telephone according to the present invention,

2 is a circuit diagram of an adapter for a telephone according to the present invention.

-Explanation of symbols for the main parts of the drawing-

10: telephone line 20: telephone

30: adapter 32: interface

34: constant voltage section 36: switching section

38: voltage rectifier 40: melody sound generator

42: dial tone decoding unit 44: control unit

46: memory sections R1-R12: resistors

D1-D6: Diode C1-C10: Capacitor

TR1-TR5: transistor VA1, AR1: impulse prevention element

L1: coil IC1-IC4: integrated circuit

The above object is, according to the present invention, in a telephone connected from a telephone main line, an interface unit for interfacing a dial signal and a voice signal input and output from any one of the telephone line and the telephone, and an AC voltage output from the interface unit. A voltage rectifying unit for rectifying the signal, a dial signal decoding unit for recognizing the dial signal outputted from the interface unit, and decoding the dial; and a signal applied from the dial signal decoding unit, and comparing with a reference signal to perform arithmetic processing. A control unit for determining a property of the received signal, a switching unit switching a voltage rectified from the constant voltage unit based on the first output signal determined by the control unit, and a current voltage applied from the switching unit to a voltage having a predetermined magnitude. Keep constant so the phone can approve call A constant voltage unit for generating a melody, a melody sound generation unit for generating a melody sound for notifying a user of an eavesdropping state on the basis of the second output signal determined by the control unit, and a memory unit for storing, withdrawing and outputting data input from the control unit; It is achieved by an adapter for a telephone to include.

Here, the voltage rectifier includes a capacitor, an impulse prevention element, and a bridge diode for full-wave rectifying the applied voltage to a predetermined size to prevent noise, instantaneous overvoltage or overcurrent, etc. embedded in the voltage applied from the telephone line. It is preferable to include a capacitor and a coil for charging, discharging and smoothing the current passing through the bridge diode within a predetermined time to output a stable voltage.

In addition, it is preferable that a plurality of transistors and resistors for switching the voltage signal applied from the voltage rectifying unit as a control signal of the control unit are connected in parallel.

In addition, the constant voltage unit is preferably connected to a zener diode and a plurality of capacitors for smoothing and rectifying and outputting the voltage signal switched from the switching unit to maintain a voltage of a predetermined magnitude.

The melody sound generating unit includes a plurality of resistors and capacitors connected to a switching unit and a control unit, a fifth transistor switched to an applied driving voltage, and a fourth integrated circuit incorporating a melody sound. It is preferable.

In addition, the dial tone decoding unit preferably includes a second integrated circuit that receives the dual tone signal applied from the interface unit through a resistor and a condenser, decodes it, and converts it into a binary electrical signal.

In addition, the memory unit preferably includes an electrically erasable EEPROM.

The control unit may include a first integrated circuit configured to compare and calculate a signal connected to the voltage rectifying unit and the switching unit, respectively, and output a corresponding control signal, and a plurality of reverse voltage preventing diodes connected to an output terminal of the first integrated circuit. And it is preferable that the resistor and the fourth transistor is connected in series.

Hereinafter, the configuration according to the present invention based on the accompanying drawings in detail.

1 is a block diagram of a telephone adapter according to the present invention, Figure 2 is a circuit diagram of the telephone adapter.

The telephone adapter 30 of the present invention is connected between the telephone line 10 and the telephone 20, and is designed so that there is no problem in the practical use of the telephone 20.

The interface unit 32 is connected between the telephone line 10 and the telephone 20 to connect a dial voltage signal or a voice signal input or output from the telephone line 10 and the telephone 20 or at the time of input / output of a signal. By adjusting the timing of the timing, the male and female connectors or jacks are connected.

The constant voltage rectifying unit 34 is connected to the interface unit 32 to rectify the AC voltage signal input via the telephone line 10 into a predetermined voltage signal, and synthesized within the voltage applied from the telephone line 10. Capacitor C7 for preventing noise, surge voltage, instantaneous overvoltage, overcurrent, etc., impulse prevention elements VA1, AR1, and bridge diode D1-D4 for full-wave rectifying the applied voltage to a predetermined magnitude. The capacitor C8 and the coil L1 for charging, discharging and smoothing the current passing through the bridge diodes D1-D4 within a predetermined time and outputting a stable voltage are connected in series and parallel.

The switching unit 36 switches the voltage rectified from the voltage rectifying unit 34 and applies a plurality of transistors TR1 for switching the voltage signal applied from the voltage rectifying unit 34 based on the control signal of the controller 44. TR3) and resistors R1 and R2 are connected in series and parallel.

The constant voltage unit 38 is a portion that maintains a voltage applied from the conduction of the switching unit 36 to a predetermined magnitude, and maintains a voltage signal switched and applied from the switching unit 36 to a voltage having a predetermined size. The zener diodes ZD1 and the plurality of capacitors C1 and C9 for smoothing and rectifying and outputting the same are connected in parallel.

The dial tone decoding unit 42 recognizes the dial tone signal of the telephone 20 applied through the interface unit 32 and converts the dial tone signal into an electric dial number signal, which is connected to one end of the interface unit 32 and applied. A second integrated circuit connected to the resistors R4 and R5 and the capacitor C3 for voltage drop and rectification of the voltage signal, and deciphering the applied dial tone and outputting it to the control unit 44 as a corresponding electric dial number signal; IC2) is included.

The controller 44 recognizes the dial number signal applied from the dial tone decoding unit 42, compares and calculates the preset dial number signal, and outputs a switching control signal to the switching unit 36. The control unit 44 is connected to the voltage rectifying unit 34 and the switching unit 36, respectively, and compares and calculates a signal applied to the first direct circuit IC1 for outputting a corresponding control signal and a first integrated circuit. The plurality of reverse voltage preventing diodes D5 and D6 and the resistors R7-R9 and the fourth transistor TR4 connected to the output terminal of the IC1 are connected in series and in parallel.

The melody sound generation unit 40 generates a stored melody sound informing the user of the eavesdropping state based on the control signal input from the control unit 44, and is connected to the switching unit 36 and the control unit 44 to control the unit 44. A plurality of resistors (R11, R12) and capacitors (C10, C11), a fifth transistor (TR5) is switched to the driving voltage (Vcc) applied as a control signal of the fourth integrated circuit (8) IC4) is included.

The memory unit 46 stores data input from the controller 44 or outputs embedded data, and may be electrically erasable EEPROM.

The function and operation of the present invention configured as described above will be described in detail.

First, the telephone adapter 30 of the present invention is mounted between the telephone line 10 and the telephone 20 in the interface state, respectively, the telephone 20 is connected to a jack, telephone line 10 The connector is connected.

A predetermined size voltage is applied from the telephone line 10 through a jack or connector, which is an interface unit 32, and a dial tone or a voice signal can be input and output to the handset of the telephone 20. Basically, the voltage applied from the telephone line 10 may be applied with an impulse or surge voltage due to a voltage drop or an internal or external condition in the process of being transmitted through a wire. Accordingly, in the voltage rectifying unit 34, the capacitor C7 and the impulse prevention elements VA1 and AR1 are connected to the interface unit 32 in parallel to block the instantaneous input of voltage and current. In addition, the bridge diodes D1-D4 act as rectifiers for the stable voltage to the telephone adapter 30. The rectified voltage is smoothed and rectified again to a more stable voltage through the capacitor C8 and the coil L1. At this time, the input signal is a voltage signal or a dial signal. In addition, the signal output through the telephone adapter 30 can also perform the same action.

The function of the telephone adapter 30 of the present invention is free to use one call, such a function, for example, if the user enters a certain number of passwords after pressing the # button while holding the handset of the telephone 20 Call tone is heard through the handset, and when call tone is heard, international and long distance calls can be made. This is because when the dial tone applied through the interface unit 32 is decoded by the dial tone decoding unit 42 and then applied to the control unit 44, the control unit 44 determines the input signal and stores the stored signal in the memory unit 46. Compared with the data, the control signal is transmitted to the telephone 20 to allow a normal telephone call. When the user completes the telephone call and hangs up the handset, the controller 44 recognizes this and automatically switches to the original state.

In addition, when the user wants to change the password or if the user wants to change the password, for example, when the user presses the handset # * # * and inputs an existing multi-digit password, a beeping sound is output. At this time, the controller 44 outputs a corresponding intermittent sound by using the melody sound generator 40. After the intermittent sound is generated, when the user inputs a new password of a plurality of digits to be changed, the intermittent sound of 'beep' is transmitted again and the input password is stored in the memory unit 46.

On the other hand, for the purpose of limiting the user's use of the phone, a function for allowing the user to make a near-field call selectively is built-in. After pressing the multiple-digit password, the control unit 44 generates a beeping sound under the control of the control unit 44. At this time, if the user presses the desired area code, the short-range call right with the beeping sound is stored. It is added to the section 46. Such a function is to allow the user to call only a corresponding area stored by inputting an area code such as short distance or long distance which is frequently used while restricting unauthorized use of the phone 20.

In addition, when deleting the set the right of call, for example, if you enter a multi-digit password after pressing the handset of the telephone ## **, all the call rights are stored in the memory unit 46 with a cracking sound of 'beep' The area code will be deleted by default. However, ordinary local calls or radio calls can be used as possible.

Another function of the telephone adapter 30 is for a person to detect an eavesdropping through the telephone line 10 or the telephone 20. If a melody sound is suddenly heard from the telephone handset during a telephone call, another telephone handset is already connected. Indicates that it is heard or eavesdropping. Since the signal switched by the switching unit 36 is applied to the control unit 44 due to the change in the magnitude of the voltage input from the telephone line 10, the control unit 44 controls the melody sound generating unit 40 The built-in predetermined melody sound is output to the handset. Therefore, the user can prevent other people from eavesdropping on private calls or secret calls, thereby maintaining telephone security.

As described above, the telephone adapter of the present invention is connected between a telephone line and a telephone, and when a separate telephone is connected to the telephone line or telephone without permission or when a telephone is accidentally intercepted, a melody sound is transmitted and is busy. It is possible to maintain security, restrict unauthorized use of the phone without entering a password, make a telephone call only to a desired area or a frequently used area by the user's choice, and change the password with a simple operation. In the office or workplace, etc., the convenience of using the telephone is increased.

Claims (8)

In a telephone connected from a telephone line, An interface unit for interfacing a dial signal and a voice signal which are input or output from one of a telephone station and a telephone; A voltage rectifying unit rectifying the AC voltage output from the interface unit into a DC voltage; A dial signal decoding unit for recognizing the dial signal output from the interface unit and decoding the dial; A control unit for recognizing a signal applied from the dial signal decoding unit, comparing the signal with a reference signal, and calculating and processing the received signal; A switching unit for switching the voltage rectified from the constant voltage unit based on the first output signal determined by the controller; A constant voltage unit which maintains a current voltage applied from the switching unit at a predetermined voltage and generates a call approval signal to the telephone; A melody sound generation unit for generating a melody sound informing the user of the eavesdropping state based on the second output signal determined by the control unit; And a memory unit for storing, retrieving and outputting data input from the control unit. The device of claim 1, wherein the voltage rectifying unit comprises: a capacitor, an impulse prevention device, which prevents occurrence of noise, instantaneous overvoltage or overcurrent, etc. embedded in a voltage applied from a telephone line; A bridge diode for full-wave rectifying the applied voltage to a predetermined magnitude; A telephone adapter comprising a capacitor and a coil for outputting a stable voltage by charging, discharging, and smoothing a current passing through a bridge diode within a predetermined time. The telephone adapter of claim 1, wherein the switching unit is connected in series and in parallel with a plurality of transistors and resistors for switching a voltage signal applied from the voltage rectifying unit as a control signal of the control unit. The telephone adapter according to claim 1, wherein the constant voltage unit is connected to a zener diode and a plurality of capacitors for smoothing and rectifying and outputting a voltage signal switched from the switching unit to a voltage having a predetermined size. The method of claim 1, wherein the melody generating unit is connected to the switching unit and the control unit a plurality of resistors and capacitors as a control signal of the control unit, A fifth transistor switched to an applied driving voltage, Adapter for a telephone, characterized in that it comprises a fourth integrated circuit with a built-in melody sound. The telephone set as claimed in claim 1, wherein the dial tone decoding unit includes a second integrated circuit which receives the dual tone signal applied from the interface unit through a resistor and a condenser, decodes it, and converts it into a binary electrical signal. Adapter. The telephone adapter of claim 1, wherein the memory unit includes an electrically erasable EEPROM. The method of claim 1, wherein the control unit, A first direct circuit which is connected to the voltage rectifying unit and the switching unit, respectively, and compares and calculates a signal applied thereto and outputs a corresponding control signal; And a plurality of reverse voltage preventing diodes and resistors connected to an output terminal of the first integrated circuit, and a resistor and a fourth transistor are connected in parallel.