KR20050080872A - Apparatus for search the bug and hidden camera - Google Patents

Abstract

The present invention relates to an eavesdropper / sneak camera detection device, wherein a wireless RF signal transmitted from the eavesdropper / sneak camera is received through a low band antenna, and the received weak low band RF signal is amplified and raised to a predetermined high band frequency. A low pass RF signal processing unit, a high pass RF signal output from the low pass RF signal processing unit and a first synthesizer for outputting an IF signal by synthesizing the provided frequency, and removing unnecessary signal components from the IF signal output from the first A low-frequency demodulator for demodulating the first IF amplifier level-level amplified, the IF signal passing through the first IF amplifier, and outputting the audio signal, converting and outputting the received RF signal level into a DC voltage, and a weak signal received through a high-band antenna. A high frequency RF signal processing unit for amplifying a high level RF signal by a predetermined level, and combining the high frequency RF signal outputted from the high frequency RF signal processing unit and the provided frequency to IF A second synthesizer for downconverting and outputting the signal, a second IF amplifier for removing unnecessary signal components from the IF signal output from the first synthesizer, and amplifying a predetermined level, and demodulating the IF signal passing through the second IF amplifier. A high frequency demodulation unit for outputting a signal and converting a received RF signal level into a DC voltage is characterized in that it is configured.

Description

Eavesdropper / Sneaky Camera Detector {Apparatus for Search the Bug and Hidden Camera}

The present invention relates to an eavesdropper / sneaky camera detecting apparatus for searching for a tapping device or a sneak camera, and more specifically, searches for a frequency generated from the tapping or sneaking camera and alerts the user to prevent damage caused by the tapping or sneaking camera. An eavesdropper / sneaky camera detection device is provided to prevent this.

Recently, micro microphones and micro cameras have been developed, which are not only easy to carry, but also have been installed in places where other people's naked eyes are difficult to be used as eavesdropping and hidden cameras.

For example, micro microphones or micro cameras can be installed in places such as toilets, dressing rooms, or hotels to not only observe or listen to the internal situation, but are also used for illegal purposes by recording and recording. There is a big problem that can be abused for commerce or crime.

Therefore, in order to be protected from such illegal eavesdropping and sneak camera, a wiretap and a sneak camera detector have been developed.

Conventional eavesdropping device is provided with a plurality of receiving antennas having a high frequency receiving unit for receiving a high frequency of a certain range, the alarm to operate by a buzzer or a lamp to the radio signal of a specific frequency received at each received high frequency receiving unit It consisted of a process part.

The wiretap detection device configured as described above detects a radio frequency (RF) signal transmitted from the wiretap transmitter of the wiretap through an antenna to alert the user that the wiretap is currently in the state of eavesdropping.

1 is a block diagram of a wire tap detection device according to the prior art,

When the high frequency receiving unit 11 receives a wide band frequency by a receiving antenna in a predetermined space, and then receives a radio wave of a predetermined electric field strength (eg, 10 MHz to 4.2 GHz) generated by a transmitter such as a wiretap device, the frequency counting unit At 12, it is counted and displayed as a digital number by the LED display unit 13, and at the same time, the alarm processing unit 14 converts the lamp operation signal and the buzzer operation signal when there is a counted frequency to the lamp 15 and the buzzer ( Activate 16).

Then, the tapping alarm and the operation of the lamp can immediately know whether the tapping, as well as the received frequency is displayed by the digital display by the LED display unit 13, the user taps by the frequency grasped by the LED display unit 13 Determines if the alarmed frequency is a specific frequency generated by the eavesdropper's transmitter or other frequencies, and ignores other alarms due to malfunction.If the frequency is caused by the eavesdropping device's transmitter, find the origin of the transmitter. I could take action.

However, since the eavesdropping detection device according to the prior art operates all the frequencies of the received broadband, there is a possibility of unnecessary malfunction, and it is difficult to grasp whether the detected frequency is the frequency of the eavesdropping device, and thus it is difficult to accurately grasp the eavesdropping state. there was.

The present invention is to solve the above-mentioned problems of the prior art, the object of the present invention is to search for the frequency generated from the wiretap or sneak camera to detect the eavesdropper or sneak camera from low frequency signal of 1.7MHz to high frequency signal up to 3GHz The present invention provides a wiretap / sneak camera detection device that detects and analyzes a signal within a specific frequency by periodically sweeping a frequency to accurately detect a wiretap / sneak camera in various frequency bands.

 In accordance with an aspect of the present invention, a wiretap / sneak detector according to the present invention is a wiretap / sneak detector that detects the operation of a wiretap or a sneak camera by searching a frequency of a broadband generated by a wiretap or a sneak camera. Amplifying and preserving a low band and high band antenna for searching for a low band and a high band RF signal from the wireless RF signal transmitted from the interceptor / sneak camera, and a weak low band RF signal received through the low band antenna A low pass RF signal processor for raising to a high band frequency, a first synthesizer for synthesizing a high frequency RF signal output from the low pass RF signal processor and a provided frequency and outputting an intermediate frequency signal (IF); A first IF amplifier which removes unnecessary signal components from the IF signal output from the first synthesizer and amplifies a predetermined level; 1 Demodulates the IF signal passing through the IF amplifier and outputs it as an audio signal, and converts and outputs the received RF signal level into a DC voltage, and a weak high band RF signal received through the high band antenna. A high frequency RF signal processing unit for level amplification, a second combining unit for combining the high band RF signal output from the high frequency RF signal processing unit with the provided frequency, down converting the IF signal into an IF signal, and outputting the IF signal from the first combining unit; A second IF amplifier which removes unnecessary signal components from the signal and amplifies a predetermined level, and outputs an audio signal by demodulating the IF signal passing through the second IF amplifier, and converts and outputs a received RF signal level into a DC voltage. Characterized in that it comprises a demodulator.

The present invention made as described above will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of a wiretap / sneak detector according to an embodiment of the present invention. Each of the low band and high band RF signals is searched for in a wireless RF signal generated by a wiretap or a hidden camera (not shown). LOW BAND ANT and HIGH BAND ANT, and a low band for amplifying and raising a weak low band RF signal received through the LOW BAND ANT to a predetermined high band frequency. A first synthesizing unit 115 for synthesizing a high frequency RF signal output from the low frequency RF signal processing unit 110 and a provided frequency and outputting an IF signal, and the first synthesizing unit 115 A first IF filter 116 for removing unnecessary signal components from the IF signal output from the first signal, a first IF amplifier 117 for preamplifying the IF signal passing through the first IF filter 116 to a predetermined level, and Demodulating the IF signal passing through the IF amplifier 117 into an audio signal. And a low pass demodulator for converting and outputting a received RF signal level (RSSI) into a DC voltage, and a high pass RF signal for a predetermined level amplification of the weak high band RF signal received through the high band antenna. A second combining unit 125 which combines the processing unit 120, the high band RF signal output from the high frequency RF signal processing unit 120 and the provided frequency, downconverts and outputs the IF signal, and the first combining unit ( A second IF filter 126 which removes unnecessary signal components from the IF signal output from 125, a second IF amplifier 127 which amplifies a predetermined level of the IF signal passing through the second IF filter 126, A high frequency demodulator 128 for demodulating the IF signal passing through the second IF amplifier 127 to output an audio signal, and converting and outputting a received RF signal level into a DC voltage; 2 Predetermined band to downconvert each RF signal input to the synthesis section 115, 125 It consists of: (Phase Locked Loop PLL) (131) El bandwidth PLL to provide a frequency, respectively.

Here, the low pass RF signal processing unit 110 is a low pass filter 111 for passing only the frequency of the low band set through the low band antenna, and the first low noise to amplify the weak RF signal passed through the low pass filter 111. A low noise amplifier (LNA) 112, a first PLL 119 for oscillating an RF signal of a predetermined band, an RF signal passing through the first LNA 112, and the first PLL 119 Up Conversion 113 for mixing and increasing the RF signal provided by the high-band frequency and the high-band RF signal from the RF signal output from the up-conversion section 113 It consists of one high pass filter (114).

In addition, the high-frequency RF signal processing unit 120 passes through the second high-pass filter 121 and the second high-pass filter 121 for filtering the RF signal of the high band set from the RF signal received through the high band antenna. A second LNA 122 for amplifying a predetermined level of an RF signal, and a third high pass filter 124 for removing unnecessary low band RF signals from the RF signal output from the second LNA 122.

When described in more detail with reference to Figure 2 attached to the operation according to the embodiment of the present invention configured as follows.

First, the present invention periodically searches for a signal within a specific frequency by sweeping a frequency from a low frequency signal of 1.7 MHz to a high frequency signal up to 3 GHz.

2 is a block diagram of a wiretap / sneak detector according to an embodiment of the present invention, wherein the low pass RF signal processing unit 110 includes a low pass filter 111, a first LNA 112, an upconversion 113, and a first pass filter. A high frequency filter 114 and a first PLL 119 are described, and the operation of each unit will be described in detail as follows.

The RF signal transmitted from the eavesdropper / sneak camera is filtered through the low pass filter 111 of any wireless RF signal in the 1.7 MHz to 1,500 MHz band received through the low band antenna, and weak through the first LNA 112. One RF signal is amplified to a predetermined level.

The RF signal output from the first LNA 112 is mixed up with the 1,500 MHz signal generated by the first PLL 119 in the up-conversion unit 113 and then at an arbitrary frequency of 1,501.7 MHz to 3,000 MHz. The output will be raised.

Here, the reason for upcovering the low-band signal is that in a system that operates by dividing the frequency into two bands, if the low-band and high-band signals are configured in the receiving circuit, the cost increases as well as other characteristics due to two separate controls. Since this signal can be transmitted, uplink of the low band signal is processed like a high band signal to simultaneously control two signals through one control chip (PLL).

The high frequency signal output through the up-conversion unit 113 is high-pass filtered again by the first high pass filter 114 to remove low-pass noise.

The first combining unit 115 receives upconverted 1,501.7 MHz to 3,000 MHz received RF signals passing through the first high pass filter 114 and 1,486.6 to 2,978.6 MHz that are input from the wide band PLL (131). Synthesize with any one of my frequencies and down-convert so that the difference frequency is 21.4 MHz.

Here, the band PLL 131 has a frequency variable range of 1,500 MHz or more due to the 'VT' voltage (0 to 30 V) applied as a wideband voltage controlled oscillator (VCO), and the main central processing device (not shown). 30,000 signals are generated sequentially from 1,486.6MHz to 2,978.6MHz at 0.05MHz intervals.

On the other hand, the desired data is modulated in the frequency of the RF signal received through the antenna, in order to hear it by voice, the modulated data within the frequency must be demodulated. In this case, in order to demodulate a frequency of many bands, each receiver circuit is not necessary, but an arbitrary frequency IF is set, and all received frequencies are converted to IF signals to demodulate.

To this end, the first IF filter 116 band-filters the downconverted 21.4 MHz IF signal output from the first synthesis unit 115 to remove unnecessary signal components, and then through the first IF amplifier 117. Amplify about 20dB of level.

The 21.4 MHz IF signal pre-amplified by the first IF amplifier 117 outputs the audio signal contained in the received RF signal by FM demodulation by the low pass demodulator 118.

In addition, since the received RF signal level input from the low band antenna is converted into DC voltage by a meter driving circuit (not shown) included in the low frequency demodulator 118, the intensity of the received input signal is increased. (RSSI) can be detected.

The high pass RF signal processing unit 120 is composed of a second high pass filter (HPF) 121, a second LNA 122 and a third high pass filter (HPF) 124, the operation of each part is as follows.

Any wireless RF signal in the 1,5000 MHz to 3,000 MHz band received through the high band antenna is filtered through the second high pass filter 121 and a predetermined level amplified by the weak RF signal received by the second LNA 122. After the low pass noise is removed again through the third high pass filter 124.

The high pass RF signal output through the third high pass filter 124 is down-converted by the second combiner 125 and output.

That is, the second combining unit 125 receives the received RF signal of the 1,500 MHz to 3,000 MHz band received with the first combining unit 115 at any one frequency within 1,486.6 MHz to 2,978.6 MHz input from the band PLL 131. And downconvert so that the difference frequency is 21.4MHz.

The 21.4 MHz IF signal down-converted by the second synthesizer 125 is filtered through the 21.4 MHz band through the second IF filter 126 to remove unnecessary signal components, and then to about 20 dB level through the second IF amplifier 127. Preamplify and output.

The 21.4 MHz IF signal pre-amplified by the second IF amplifier 127 performs FM demodulation of the RF signal by the high frequency demodulator 128 to output an audio signal contained in the received RF signal.

In addition, since the received RF signal level input from the high band antenna by the meter driving circuit (not shown) included in the high frequency demodulation unit 128 is converted into a DC voltage and outputted, the strength of the received input signal is increased. (RSSI) can be detected.

Although a preferred embodiment according to the present invention has been described above, it may be modified in various forms according to a frequency band for downcovering or upcovering methods and detection of a wiretap / sneak camera, and the general knowledge in the art. It is understood that those skilled in the art could make various modifications and variations without departing from the scope of the claims of the present invention.

As described above, the interceptor / sneak camera detection apparatus according to the present invention periodically sweeps frequencies from a low frequency signal of 1.7 MHz to a high frequency signal up to 3 GHz when searching for an RF signal generated from the eavesdropper or a hidden camera. By finding and analyzing the signals within, it is possible to accurately detect the taps / sneak cameras of various frequency bands.

1 is a block diagram of a wire tap detection device according to the prior art,

Figure 2 is a block diagram of a wiretap / hidden camera detection apparatus according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

110: low pass RF signal processing unit 111: low pass filter

112: first low noise amplifier 113: upconversion unit

114: first high pass filter 115: first synthesis section

116: first IF filter 117: first IF amplifier

118: low pass demodulation unit 120: high pass RF signal processing unit

121: second high pass filter 122: second low noise amplifier

124: third high pass filter 125: second synthesis section

126: second IF filter 127: second IF amplifier

128: high frequency demodulator 131: band PLL

Claims (7)

In the wiretap / sneak detector which detects the operation of the wiretap or the hidden camera by searching the frequency of the broadband generated by the wiretap or the hidden camera, A low band and high band antenna for searching for a low band and a high band RF signal from the wireless RF signal transmitted from the eavesdropper / sneak camera; A low frequency RF signal processor for amplifying and raising a weak low band RF signal received through the low band antenna to a predetermined high band frequency; A first synthesizer for combining the high band RF signal outputted from the low frequency RF signal processor with a provided frequency and outputting a difference frequency RF signal; A first intermediate frequency amplifier for removing unnecessary signal components from the intermediate frequency signal output from the first combining unit and amplifying a predetermined level; A low pass demodulator for demodulating the intermediate frequency signal passing through the first intermediate frequency amplifier as an audio signal and converting the received RF signal level into a DC voltage; A high frequency RF signal processor for amplifying a predetermined level of the weak high band RF signal received through the high band antenna; A second synthesizing unit for synthesizing a high frequency RF signal output from the high frequency RF signal processing unit and a provided frequency and outputting an intermediate frequency signal; A second intermediate frequency amplifier which removes unnecessary signal components from the intermediate frequency signal output from the first combining unit and amplifies a predetermined level; And Eavesdropper / sneak camera detection comprising: a high frequency demodulator for demodulating the intermediate frequency signal passing through the second intermediate frequency amplifier and outputting an audio signal and converting the received RF signal level into a DC voltage Device. The method of claim 1, The low pass RF signal processing unit includes a low pass filter for passing only the frequency of the low band set through the low band antenna; A first low noise amplifier for amplifying the weak RF signal passing through the low pass filter; An up-conversion section for raising and outputting the RF signal passing through the first low noise amplifier to a high band frequency; And And a first high pass filter for filtering a high band RF signal from the RF signal output from the up-conversion unit. The method of claim 2, And a first PEL unit configured to provide an RF signal of a predetermined band to be combined with the RF signal output from the first low noise amplifier in addition to the upconversion unit. The method of claim 1, The high pass RF signal processing unit includes a second high pass filter for filtering a high band RF signal set in the RF signal received through the high band antenna; A second low noise amplifier for amplifying a predetermined level of the weak RF signal passing through the second high pass filter; And And a third high pass filter for removing unnecessary low band RF signals from the RF signals output from the second low noise amplifier. The method of claim 1, The apparatus of claim 1 or 2, further comprising a band PI to provide a frequency of a predetermined band to downconvert each RF signal input to the first and second synthesizing units. The method according to claim 1 or 5, And the first synthesizer synthesizes the low band RF signal output from the low pass RF signal processing unit and the RF signal provided from the band PEL and downconverts the output frequency to the difference frequency. The method according to claim 1 or 5, And wherein the second combining unit synthesizes the high band RF signal output from the low frequency RF signal processing unit and the RF signal provided by the band PEL and down-converts to the difference frequency to output the same.