KR20020003690A - A Jammer - Google Patents

Abstract

PURPOSE: An apparatus for generating a jamming wave is provided so that a cellular phone cannot be used in a designated area by intercepting an electric wave band of the cellular phone, namely 869 to 894MHz of DCS and 1840 to 1870MHz of PCS. CONSTITUTION: When a user sets up a wanted measurement/wave generation mode, for example a jamming wave generation mode through a switch(80), a control unit(10) outputs a signal to a D/A converter(20) under the control of an interface(90), and the D/A converter(20) transmits an analog value to a voltage control oscillator(30). Here, the voltage control oscillator(30) generates a corresponding frequency according to a reference voltage from the control unit(10). When the voltage control oscillator(30) receives a waveform of a jamming wave from a waveform generator(40), demodulates the jamming wave, and applies it to the corresponding frequency, it passes through a band-pass filter(70). Accordingly, only the DCS/PCS band frequency which is a cellular phone wave remains. A detector(50) measures a strength of the frequency. That is, the detector(50) generates a frequency containing a sum or difference of the frequency passing through the band-pass filter(70) in a mixer unit(60) and the frequency generated in the voltage control oscillator(30), and oscillates the frequency through the band-pass filter(70).

Description

Jammers {A Jammer}

The present invention relates to a jammer generating apparatus, and more particularly, in order to prevent people or any situation in the vicinity of the public morals by using an unrestricted use of a mobile phone in public places, in order to prevent harm to public morals, The present invention relates to a mobile phone radio wave blocking device that can block radio waves in a multi-area by applying a jamming technology that can block radio wave bands.

In general, the damage of the commonly used mobile phone is causing noise damage to other people around by the phone call of the mobile phone user in the performance hall or public place, or the problem of the loss of public morals has begun to emerge. .

In order to prevent such harm, it is common to notice that public places are prohibiting the use of mobile phones.

Accordingly, the present invention has been made in view of the above problems, and it is possible to block the radio bands of mobile phones, that is, DCS (869-889 MHz) and PCS (1840-1870 MHz), so that the apparatus using the apparatus can be used. The purpose of the installation is to provide a jammer that allows the use of a mobile phone to be fully controlled.

1 is a block diagram of the present invention

2 is a flow diagram of the operation of the present invention

* Description of the symbols for the main parts of the drawings *

10 ..., controller 20 ..., D / A converter

30 ..., voltage controlled oscillator 40 ..., waveform generator

50 ... detector 60 ... mixer

70 ..., Band filter 80 ..., switch

90 ..., interface

In order to achieve the object described above, the present invention controls an user interface unit, an A / D converter for determining the presence or absence of a corresponding channel, and a D / A converter for generating a reference voltage of a voltage controlled oscillator. A control unit having an electrical connection therewith and a switching control function for routing a circuit; An A / D converter converting and outputting the digital control value of the control unit into analog data; A voltage controlled oscillator for generating a corresponding frequency according to a reference voltage input from the controller; A waveform generator for generating a waveform of the jammer and outputting the waveform to the voltage controlled oscillator; A detector serving as an input reference of the controller for measuring power of a frequency; A mixer for generating a frequency consisting of a sum and a difference between a frequency passed through a filter and a frequency generated by the voltage oscillator; A band pass filter for passing only a desired band of frequencies induced through the antenna; A switch for measuring and selecting a disturbance signal generation mode by a signal of the controller; There is provided a jammer generating apparatus comprising an interface including a key input unit for setting an operation time of a jamming signal generation from a user and a display device for checking the current time and operation.

Hereinafter, with reference to the accompanying drawings will be described on the basis of the preferred embodiment of the configuration and operation effects of the jammer generator according to the present invention.

(Example)

Currently, domestic mobile phone transmission and reception radio bands use two bands of DCS (869 ~ 894MHz) and PCS (1840 ~ 1870MHz) together. In the present invention, it is designed to block 2 bands simultaneously as one device. In addition, the output is designed to increase the output of the jammer generator so as to sufficiently cover the information of the base station in consideration of the reception sensitivity of the mobile phone terminal, as shown in the schematic block diagram of the present invention of FIG. As described above, when the desired mode (measurement of jammer generation mode is shown in the drawing) is set through the switch 80, the control unit 10 controls the signal D / D to be controlled by the interface 90. It outputs to the A converter 20 and the D / A converter 20 transfers the analog value to the voltage controlled oscillator 30.

In this case, the voltage-controlled oscillator 30 generates a corresponding frequency according to the reference voltage input from the controller 10. After receiving the waveform of the jammer generated through the waveform generator 40 and performing modulation, When loaded on a frequency, it passes through the bandpass filter 70, where only the frequency of the DCS / PCS band, which is a mobile phone radio wave, is present.

The detector 50 measures the intensity of the frequency, which is the same as a known technique composed of a filter, a pin diode, and an amplifier (not shown). The value of the detector 50 is the input of the A / D converter of the controller 10. By generating a frequency consisting of the sum of the frequency passed by the filter in the mixer 60 and the frequency generated by the voltage controlled oscillator 30, the difference is oscillated through the band filter 70 of the rear stage, Since it generates a jamming radio wave of the blocking method for the frequency band of the mobile phone introduced in Korea, it is prohibited to use the mobile phone in the place where the device of the present invention is installed.

A schematic operation flow for the operation of the apparatus of the present invention is that when the operation is instructed through the user interface 90 as shown in Figure 2 (operation command for operating the program through the input means, such as a keyboard) program execution Outputting a control signal to the power measurement mode switch 80 through a variable required for the control and an interrupt initialization (ST 1) (ST 2); Determining a channel existing by measuring power for each channel (ST 3); Outputting a control signal to the jammer generation mode switch 80 (ST 4); Detecting a frequency of a currently existing band and generating a jammer of the corresponding frequency to block the band (ST 5); When the period required for power measurement is set and the time comes, it operates as a step (ST 6) of re-searching and setting the channel of the current position.

As described above, the jammer generator may be used in a place where minimal public morality is required, such as a lecture room, a conference room, or the like, so that noise caused by a call of a mobile phone can be freed from interference, and a frequency band existing at a current place. It is to minimize the friction with the operator by blocking only the required frequency band without generating the interference frequency corresponding to the entire area of the DCS / PCS by detecting the

Although the jammer generator of the present invention has been described on the basis of a limited embodiment, the present invention is not limited to the above embodiment, and the general knowledge in the technical field to which the present invention belongs without departing from the gist of the present invention. Various changes and modifications can be made by a person having ordinary skill in the art to fall within the scope of the present invention.

Claims (1)

In implementing the jammer generator, Controls the user interface, and has an electrical connection between the A / D converter to check the presence or absence of the corresponding channel and the D / A converter to generate the reference voltage of the voltage controlled oscillator. A control unit having a; A D / A converter converting and outputting the digital control value of the control unit into analog data; A voltage controlled oscillator for generating a corresponding frequency according to a reference voltage input from the controller; A waveform generator for generating a waveform of the jammer and outputting the waveform to the voltage controlled oscillator; A detector serving as an input reference of the controller for measuring power of a frequency; A mixer for generating a frequency consisting of a sum and a difference between a frequency passed through a filter and a frequency generated by the voltage oscillator; A band pass filter for passing only a desired band of frequencies induced through the antenna; A switch for measuring and selecting a jammer generation mode by a signal of the controller; A jammer generator comprising an interface including a key input unit for setting an operation time of jammer generation from a user and a display device for checking the current time and operation.