KR100731816B1 - Eavesdropping prevention method and apparatus using sound wave - Google Patents

Abstract

An eavesdropping prevention method using sound waves and a device thereof are provided to be capable of delivering a frequency different from a conversational sound wave to a conversation zone, thus eavesdropping or recording can be prevented without influencing conversation. An oscillator(20) generates an oscillating frequency in a designated frequency band which prevents a microphone from operating by saturating the microphone itself. An amplifier(40) amplifies the generated oscillating frequency. A speaker(50) delivers the amplified frequency to the outside. A frequency converter(30) is connected between the oscillator(20) and the amplifier(40), and converts the generated frequency to output the converted frequency. A micro computer(80) controls the frequency converter(30) in connection with the converter(30).

Description

Eavesdropping method and device using sound waves {EAVESDROPPING PREVENTION METHOD AND APPARATUS USING SOUND WAVE}

1 is a view for explaining the principle of the eavesdropping prevention method using a conventional white noise;

2 is a block diagram for explaining a method and apparatus for preventing eavesdropping using conventional white noise;

3 is a view for explaining the principle of the eavesdropping method using sound waves according to the spirit of the present invention;

Figure 4 is a block diagram for explaining an eavesdropping device using sound waves according to the spirit of the present invention;

5 is a block diagram illustrating a method and apparatus for preventing eavesdropping according to a preferred embodiment of the present invention;

6 is a view for explaining a method and apparatus for preventing eavesdropping according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: transistor

2: band pass filter

3, 40: amplifier

4, 50: Speaker

10: wiretap prevention device

20: oscillator

30: frequency converter

70: volume control unit

80: microcomputer

The present invention relates to a method and apparatus for preventing eavesdropping using sound waves, and more specifically, to tapping or using sound waves for preventing eavesdropping or recording performed by using tapping devices capable of recording such as a wiretap, a voice recorder, and an MP3 player. It relates to a method and an apparatus.

With the development of information and communication technology, social problems are emerging due to convenience of life and information leakage. In other words, with the development of various wireless communication devices, various illegal eavesdroppers and sneak shot cameras are being used, which seriously violates the privacy and human rights of individuals. As a result, countries are making efforts to prevent this through legal regulations and policies, and individuals are trying to prevent exposure to illegal eavesdropping and sneak cameras by utilizing various detection devices that can detect eavesdroppers or sneak shots. I'm leaning.

Accordingly, the inventors of the present invention discloses the electric field strength of the radio frequency transmitted from the wireless eavesdropper through the "portable wired / wireless wiretap, laser wiretap, sneak shot detection and prevention equipment" of the Republic of Korea Patent Publication No. 10-2006-0021803 In the measurement, it has been proposed to compare the electric field strength and the higher electric field strength as a reference so that the output can be easily searched without the user's operation.

In addition, the inventors of the Republic of Korea Patent Application No. 10-2006-0118123 "wireless hearing aid and sneak camera wireless detection module and a mobile phone using the same" to configure a device for detecting a radio signal transmitted from the wireless eavesdropper and sneak camera It has proposed a technology that allows signal receiving and processing devices to be integrated in the form of micro devices and chips, modularized into a chipset, and embedded in a mobile phone to independently perform its functions.

On the other hand, the method proposed in the prior art including the technique proposed by the inventors for the prevention of eavesdropping and recording is produced by the white noise (white noise) by the tapping device (recording equipment such as a wiretap or a voice recorder; Commonly referred to as a "tapping device" to interfere with eavesdropping or recording.

When the human hearing is listening to a sound wave A, if a sound wave B with a larger amplitude than the sound wave A is applied, the original sound wave A is not heard. At this time, the sound wave A is said to be masked by the sound wave B, and this phenomenon is called a masking effect. In addition, when there are multiple sounds (including unspecified noise generated by equipment), humans have the ability to select and listen to the sound waves they want to hear. This human hearing ability is called the Cocktail Party Effect. On the other hand, electrical or mechanical devices such as microphones that receive sound waves (hereinafter referred to as microphones) have the ability to collect only sound waves themselves, so that the original sound waves and unspecified noises are masked when unspecified noise is mixed. Has a limitation of being collected. In addition, the tapping device should be located in a range within a sound field that is a place where sound waves that are the subject of tapping or recording waves exist in order to collect a dialog or an external conversation.

Therefore, the eavesdropping prevention method using white noise is a principle that obstructs the sound wave flowing into the microphone of the tapping device due to the masking effect by the output of another unnecessary sound wave (noise). That is, as shown in Fig. 1, the eavesdropping prevention method using the white noise is to generate the noise of the audible frequency band so that the conversational sound wave has the above-mentioned masking effect, and generates the unspecified noise of the audible frequency band. In order to interfere with the ability to eavesdrop or record.

As shown in FIG. 2, the method of generating white noise includes the transistor 1 as an open collector, combined with only a base and an emitter to generate the noise of the transistor 1 itself, and a band pass filter 2. And a band-pass filter. The band pass filter 2 filters only noise within 20 Hz to 20 kHz, which is a desired audio frequency band, and this noise is amplified by an amplifier 3 and then output through the speaker 4.

However, such a conventional method, that is, a method of preventing eavesdropping due to white noise, is formed in the form of generating white noise in the audible frequency band, so that a masking effect may be generated only when white noise greater than the intensity of sound waves carried in a human voice is generated. If you look from the user's point of view, you will feel uncomfortable. In other words, the use of such a method is impossible to conceal because the use of noise is generated, and there is a problem that the other party that is the conversation partner or the eavesdropper knows. It should be close to the point to be prevented, it is difficult to use in a relatively large space, and there is a problem that the conversation is difficult due to noise.

Accordingly, the present invention has been proposed to solve the problems of the prior art, and a new type of sound waves that can effectively prevent eavesdropping or recording using a tapping device, which is a recordable device such as a tapping machine or a voice recorder, MP3, etc. An object of the present invention is to provide a method and apparatus for preventing eavesdropping used.

Particularly, the present invention overcomes the disadvantages of the prior art of using all frequencies of the audio frequency band as noise by preventing the microphone itself from operating by using a frequency of the non-audible band in the audio frequency band unlike the prior art. The present invention aims to provide a method and apparatus for preventing eavesdropping using a new type of sound waves that can be used, which can make the conversation partner or eavesdropper not know, can be easily used in a relatively large space, and does not interfere with the conversation. .

In addition, the present invention makes it impossible to eavesdropping and recording with any kind of tapping device using a microphone, thereby tapping a new type of sound wave that can solve the problems of leakage of illegal information and violation of privacy through illegal tapping or recording. It is an object of the present invention to provide a prevention method and apparatus.

According to a feature of the present invention for achieving the above object, the present invention provides a method for preventing eavesdropping using sound waves for preventing eavesdropping and recording of an eavesdropping device using a microphone. Obtaining a first oscillation frequency; And amplifying the obtained first oscillation frequency so as to be transmitted in an area to prevent eavesdropping and recording of the wiretap apparatus.

In the anti-tapping method using sound waves according to the present invention, the inaudible band may be 17 kHz to 20 kHz.

Acquiring the second oscillation frequency different from the first oscillation frequency in the inaudible band after the transmission of the first oscillation frequency in the method of preventing eavesdropping using sound waves according to the present invention; Amplifying the obtained second oscillation frequency so as to be transmitted in an area to prevent eavesdropping and recording of the eavesdropping device, so that a frequency transmitted in an area to prevent eavesdropping and recording of the eavesdropping device is changed. can do.

Acquiring a second oscillation frequency different from the first oscillation frequency in the inaudible band in the method of preventing eavesdropping using sound waves according to the present invention; Amplify the obtained second oscillation frequency to be transmitted in an area to prevent eavesdropping and recording of the eavesdropping device, and transmit the second oscillation frequency at a transmission position different from the transmission position of the first oscillation frequency. Can be.

According to another feature of the present invention for achieving the above object, the present invention in the eavesdropping prevention method using a sound wave for preventing eavesdropping and recording of the tapping device using a microphone, by saturating the microphone itself Acquiring an oscillation frequency in a designated frequency band that prevents the signal; Amplifying the obtained oscillation frequency so as to be transmitted in an area to prevent eavesdropping and recording of the tapping apparatus, thereby saturating characteristic values of the microphone element to prevent eavesdropping and recording.

In the method of preventing eavesdropping using sound waves according to the present invention, the designated frequency band may be an inaudible band within the audible frequency band.

In the method for preventing eavesdropping using sound waves according to the present invention, the designated frequency band may be 17 kHz to 20 kHz.

In the method of preventing eavesdropping using sound waves according to the present invention, the oscillation frequency obtained in the specified frequency band may be different from the oscillation frequency transmitted in the previous step.

In such a method for preventing eavesdropping using sound waves according to the present invention, two or more oscillation frequencies may be obtained in the designated frequency band, and each oscillation frequency may be transmitted at different transmission positions.

According to another feature of the present invention for achieving the above object, the present invention provides a saturation of the microphone itself in the anti-tap device using a sound wave for preventing eavesdropping and recording of the tapping device that is collected using a microphone An oscillator for generating an oscillation frequency in a designated frequency band which prevents operation; An amplifier for amplifying the oscillation frequency generated by the oscillator; And a speaker for transmitting the frequency amplified by the amplifier to the outside.

In the anti-tapping apparatus using sound waves according to the present invention, a frequency converter connected between the oscillator and the amplifier for converting and outputting the frequency generated by the oscillator; It may be further provided with a microcomputer connected to the frequency converter for controlling the frequency converter, so that the frequency transmitted can be changed.

In the anti-tapping apparatus using sound waves according to the present invention, the volume control unit may be further connected to the amplifier to adjust the output of the amplifier under the control of the microcomputer.

According to still another aspect of the present invention for achieving the above object, the present invention provides a non-hearing device in an audible frequency band in a soundproofing device using sound waves for preventing eavesdropping and recording of an eavesdropping device using a microphone. An oscillator for generating an oscillation frequency in a band; A frequency converter for converting and outputting the oscillation frequency generated by the oscillator; A microcomputer connected to the frequency converter to control the frequency converter; An amplifier for amplifying the frequency output from the frequency converter; A volume control unit for adjusting the output of the amplifier by the control of the microcomputer; And a speaker for transmitting the frequency amplified by the amplifier to the outside.

In the anti-tapping apparatus using sound waves according to the present invention, the amplifier includes two or more, and the speaker includes two or more transmitters connected in one-to-one connection with each of the two or more amplifiers. The transmission of different frequencies can be made.

3 is a view for explaining the principle of the eavesdropping prevention method using sound waves according to the technical idea of the present invention, Figure 4 is a block diagram for explaining the tapping prevention device using sound waves according to the technical idea of the present invention.

Referring to FIG. 3, the method for preventing eavesdropping using sound waves according to the technical idea of the present invention obtains an oscillation frequency in a designated frequency band that prevents operation by saturating the microphone itself of the tapping apparatus, and then obtains the obtained oscillation frequency. A tapping device installed for tapping or being carried (especially by a conversation partner) by amplifying and transmitting in an area to prevent tapping and recording of the tapping device (in this case, the tapping device in the present invention is a tapping using sound waves). It disables microphones of devices, voice recorders, MP3s, etc., and any type of device that listens to or taps or records microphone sound waves, which prevents them from intercepting or recording conversations.

Various frequency bands may be specified to saturate the microphone itself to prevent operation. However, since the microphone provided for the conventional sound collection is manufactured and provided so as to collect sound waves in the range of 20 Hz to 20 kHz, the audible frequency band is preferably a designated frequency band. In particular, in the present invention, in order to avoid inconvenience of conversation and to prevent eavesdropping and recording without the other party's knowledge, the non-audible band frequency in the audible band is applied.

Generally, the audio-frequency band is known as 20 Hz to 20 KHz, but the 17 kHz to 20 kHz band is known as the inaudible band in the audio frequency band. And although it is an audible frequency band depending on an individual difference, it is known that it is inaudible even more than 12 kHz. Accordingly, in the present invention, the inaudible band refers to a frequency band that saturates the microphone itself and does not interfere with the conversation in the audible frequency band (without being heard by the conversation partner). Such an inaudible band which is preferably proposed in the present invention is 17 kHz to 20 kHz. Of course, the technical idea of the present invention is basically to obtain a specific frequency (oscillation frequency) in the frequency band capable of disabling the microphone and then amplify and transmit the same.

Such a tapping and recording method according to the present invention is a concept in contrast to FIG. 1 described in the prior art, and as shown in FIG. 3, a conversation sound wave and a different frequency (sound wave) are transmitted to the conversation area (sound field). It is characterized by not affecting. That is, while the prior art has applied a masking effect by generating all frequencies (sound waves) in the audible frequency band, the present invention can smoothly communicate by transmitting a frequency of a band incapacitating a microphone different from the frequency band of a conversation area to a sound field. To prevent eavesdropping and recording. In addition, the present invention obtains the frequency of the non-audible band in the audible frequency band (that is, the band collected by the microphone) and transmits it in the sound field, it is possible to conceal the eavesdropping device to eliminate the opponent's rejection will be. Therefore, according to the present invention, it is possible to effectively prevent eavesdropping or recording by using a tapping device which is a recordable device such as a tapping machine or a voice recorder, MP3, and the like. In addition, the present invention overcomes the disadvantages of the prior art using all frequencies in the audible frequency band as noise by preventing the microphone itself from operating by saturating the microphone itself in the audible frequency band, unlike the prior art. It can be used easily even in a large space.

Referring to FIG. 4, an eavesdropping device 10 using sound waves according to the present invention includes an oscillator 20, an amplifier 40, and a speaker 50, and performs tapping and recording of an eavesdropping device using a microphone. prevent. At this time, the oscillator 20 generates an oscillation frequency in a designated frequency band to prevent the microphone itself from operating. The amplifier 40 amplifies the oscillation frequency generated by the oscillator 20, and the frequency amplified by the amplifier 40 is transmitted to the outside through the speaker 50.

Such a configuration is the most basic form for realizing the tapping prevention method using the sound wave according to the present invention described above. In addition, the eavesdropping method is configured to change the oscillation frequency generated in the oscillator 20 and the configuration for adjusting the volume of the frequency transmitted as in the preferred embodiment of the present invention further prevents eavesdropping and recording Do it.

Such an eavesdropping device 10 according to the present invention has a high frequency band which is inaudible to human hearing in an audible frequency band, unlike a conventional eavesdropping device that uses unspecified noise in an audio frequency (20 Hz to 20 kHz) band. By strongly generating (amplifying) a specific frequency (non-audible band), the characteristic value of the microphone itself is saturated. A microphone generally used in a wiretap device is a condenser microphone element, which is characterized by using one of the pole plates as a diaphragm. When the plate vibrates by sound waves, the capacitance of the capacitor changes and accumulates the charge. Change, resulting in a current flowing in response to changes in the sound wave. According to the present invention, the specific frequency of the high band is generated strongly, so that the accumulated charge of the condenser microphone becomes saturated so that overcurrent flows, and thus normal collection cannot be performed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 5 and 6. On the other hand, it is easy to know from related technologies in this field, such as the technology related to the tapping and recording part using the general tapping device in each drawing, the characteristics according to the type of the microphone, and the technology of processing the sound source of a specific frequency band and transmitting it through the speaker. Illustrations and detailed descriptions of possible configurations, operations and effects thereof are given briefly or omitted, and are shown based on the parts related to the present invention.

5 is a block diagram for explaining a method and apparatus for preventing eavesdropping according to a preferred embodiment of the present invention, Figure 6 is a view for explaining a method and apparatus for preventing eavesdropping in accordance with another preferred embodiment of the present invention.

Referring to FIG. 5, the wiretap prevention method and apparatus 10 according to the preferred embodiment of the present invention may include an oscillator 20, a frequency converter 30, an amplifier 40, a speaker 50, and a volume controller 70. And a microcomputer 80 to prevent eavesdropping and recording of the tapping device that is collected using the microphone. At this time, the oscillator 20 generates an oscillation frequency in the inaudible band within the audible frequency band, and the frequency converter 30 converts the oscillation frequency generated in the oscillator 20 under the control of the microcomputer 80 (Processor). To output. The amplifier 40 amplifies the frequency output from the frequency converter 30, and the volume controller 70 adjusts the output of the amplifier 40 under the control of the microcomputer 80. The frequency amplified by the amplifier 40 is transmitted to the outside through the speaker 50.

Here, the frequency converter 30 is a configuration provided to vary the oscillation frequency under the technical idea of the present invention. The eavesdropping prevention device 10 according to a preferred embodiment of the present invention through the frequency converter 30 changes the frequency transmitted so that the eavesdropping prevention method using sound waves according to the present invention is made more highly. That is, the microcomputer 80 controls the frequency converter 30 so that the oscillation frequency is changed by the random number in the designated frequency band (in this embodiment, the inaudible band in the audible frequency band). At this time, the oscillator 20, such as an oscillator (oscillator), the vibration caused by the oscillation of the signal generator is reduced over time, the energy is reduced by supplying the external energy by the amount that is reduced at every vibration, the vibration is a constant amplitude It will be possible to apply a high frequency oscillator that keeps it. In addition, the control signal of the microcomputer 80 divides the high band into several and can be adjusted while viewing the state of the sound as a graph {graphic equalizer; In this embodiment, the element included in the frequency converter 30 is used.

On the other hand, the volume control unit 70 is configured to widen the sound field of the frequency (sound wave) transmitted through the speaker 50 in order to prevent eavesdropping and recording under the control of the microcomputer 80. By controlling the output of the amplifier 40 through the volume control unit 70 as described above, it is possible to adjust the range of the area requiring the prevention of eavesdropping and recording.

According to the present invention, it is possible to completely solve the noise problem, which is the biggest disadvantage of the prior art, so that the work can be seen without any inconvenience at the time of conversation, and the voice recorder (digital method), which is not normally detected by the tapping detection device, It is possible to completely solve the problem of eavesdropping through the storage media such as MP3.

Referring to FIG. 6, the wiretap prevention device 10 according to the present invention comprises two or more amplifiers 40, and the speaker 50 comprises a number (two or more) corresponding to the amplifiers 40. By allowing each amplifier and the speaker to be connected one-to-one, transmission of different frequencies can be made through different speakers. Such a configuration is intended to implement a more advanced eavesdropping technique due to the interference and superposition of sound waves.

Although the above-mentioned tapping prevention method and apparatus using sound waves according to a preferred embodiment of the present invention as described above are illustrated according to the above description and drawings, this is merely an example and is not limited to the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made therein.

According to the method and apparatus for preventing eavesdropping using sound waves according to the present invention, it is possible to prevent eavesdropping and recording without affecting the conversation by transmitting a frequency different from the conversation sound waves to the conversation area. In addition, the present invention obtains the frequency of the inaudible band in the audio frequency band and transmits it in the sound field, it is possible to conceal the eavesdropping device can eliminate the opponent's rejection. Therefore, the present invention can effectively prevent eavesdropping or recording by using a tapping device, which is a recordable device such as a tapping machine or a voice recorder, MP3, or the like. In addition, the present invention overcomes the disadvantages of the prior art of using all frequencies of the audible frequency band as noise by preventing the microphone itself from operating by using a frequency of the inaudible band in the audible frequency band, unlike the prior art. It can be used easily in space.

Claims (14)

In the method of preventing eavesdropping using sound waves to prevent eavesdropping and recording of a tapping device using a microphone, Obtaining a first oscillation frequency in the inaudible band within the audible frequency band; And amplifying the obtained first oscillation frequency so as to be transmitted in an area to prevent eavesdropping and recording of the eavesdropping apparatus. The method of claim 1, The non-audible band is 17 kHz to 20 kHz prevention of interception using sound waves. The method according to claim 1 or 2, After transmitting the first oscillation frequency, acquiring a second oscillation frequency different from the first oscillation frequency in the inaudible band; Amplifying the obtained second oscillation frequency to be transmitted in an area to prevent eavesdropping and recording of the eavesdropping device, wherein a frequency transmitted in the area to prevent eavesdropping and recording of the eavesdropping device is changed. Eavesdropping method using sound waves, characterized in that to make. The method according to claim 1 or 2, Obtaining a second oscillation frequency different from the first oscillation frequency in the inaudible band; Amplifying the obtained second oscillation frequency so as to be transmitted in an area to prevent eavesdropping and recording of the eavesdropping apparatus, and transmitting the second oscillation frequency at a transmission position different from the transmission position of the first oscillation frequency; Tapping prevention method using a sound wave characterized in that. In the method of preventing eavesdropping using sound waves to prevent eavesdropping and recording of a tapping device using a microphone, Obtaining an oscillation frequency in a designated frequency band that saturates the microphone itself to prevent operation; Amplifying the obtained oscillation frequency so as to be transmitted in an area to prevent eavesdropping and recording of the eavesdropping device, thereby preventing eavesdropping and recording by saturating characteristic values of the microphone element. How to prevent eavesdropping using sound waves. The method of claim 5, And wherein said designated frequency band is an inaudible band within an audible frequency band. The method of claim 6, The oscillation frequency is a tapping prevention method using sound waves, characterized in that the frequency within 17kHz to 20kHz. The method according to any one of claims 5 to 7, And the oscillation frequency obtained in the designated frequency band after the step of transmitting the sound wave is different from the oscillation frequency transmitted in the previous step. The method according to any one of claims 5 to 7, The oscillation frequency obtained in the designated frequency band is made of two or more, each oscillation frequency is characterized in that the transmission from the different transmission position using the sound wave prevention method. In the eavesdropping device using sound waves to prevent eavesdropping and recording of the eavesdropping device using a microphone, An oscillator for generating an oscillation frequency in a designated frequency band to saturate the microphone itself so as not to operate; An amplifier for amplifying the oscillation frequency generated by the oscillator; Eavesdropping device using a sound wave, characterized in that it comprises a speaker for transmitting the frequency amplified by the amplifier to the outside. The method of claim 10, A frequency converter connected between the oscillator and the amplifier to convert and output a frequency generated by the oscillator; And a microcomputer connected to the frequency converter for controlling the frequency converter, so that the transmitted frequency can be changed. The method of claim 11, And a volume control unit connected to the amplifier for adjusting the output of the amplifier by the control of the microcomputer. In the eavesdropping device using sound waves to prevent eavesdropping and recording of the eavesdropping device using a microphone, An oscillator for generating an oscillation frequency in an inaudible band within an audible frequency band; A frequency converter for converting and outputting the oscillation frequency generated by the oscillator; A microcomputer connected to the frequency converter to control the frequency converter; An amplifier for amplifying the frequency output from the frequency converter; A volume control unit for adjusting the output of the amplifier by the control of the microcomputer; Eavesdropping device using a sound wave, characterized in that it comprises a speaker for transmitting the frequency amplified by the amplifier to the outside. The method of claim 13, The amplifier is composed of two or more, and the speaker has a number corresponding to the amplifier, so that each of the two or more amplifiers and each of the two or more speakers to be connected in a one-to-one, different through different speakers Eavesdropping device using sound waves, characterized in that the transmission of the frequency.

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