Recording prevention system and method for preventing unauthorized recording

Abstract

The present invention relates to a recording prevention system and method for preventing unauthorized recording. The recording prevention system of the present invention comprises a plurality of jamming modules for generating and transmitting jamming waves implemented as ultrasonic waves toward a target for preventing unauthorized recording, and can implement intensive jamming by dividing the plurality of jamming modules into, for example, groups and configuring the groups to be directed toward the same target. In addition, when a speaking person becomes the target, the recording prevention system can enhance a recording prevention effect by outputting, together with the jamming waves, cancelling sound waves that reduce the volume of the voice .

Description

Recording prevention system and method for preventing unauthorized recording

[0001] The present invention relates to a system and method for preventing unauthorized recording.

[0002] Widely used techniques to prevent unauthorized recording include methods that use ultrasound to induce interference and 'sound masking' techniques that use acoustic noise, such as white noise, to induce interference and prevent recording. This intentional sending of interference signals to a targeted frequency band to cause signal interference is called radio jamming.

[0003] Ultrasound consists of sound waves in a frequency band undetectable by the human ear; while it is harmless to the human body, it can cause significant interference with the reception of recording devices. The frequency band of ultrasound creates irregular vibrations in the sound film of microphones used by voice or video recording equipment, causing noise to be mixed into the recorded sound.

[0004] Because white noise has a uniform spectral density across the entire audible frequency band, it mixes with the voice signal collected by the recording device, rendering it unclear and making it impossible to distinguish the voice signal from the recorded signal. Since white noise also affects the audible frequency band, it is audible to humans and interferes with meetings or conversations. Therefore, ultrasound is primarily used to prevent unauthorized recording.

[0005] On the other hand, when ultrasound is emitted at high output, it can cause unintended vibrations in devices such as speakers, generating noise, and the range for jamming with limited output is typically restricted to approximately 3 meters. Because ultrasound has strong directional properties, there must be no obstacles between the microphones of the recording device to achieve recording prevention; if the microphones are placed in pockets or bags, it is difficult to achieve recording prevention through jamming. It is also difficult to achieve a jamming effect even if the directivity of the ultrasound is reduced. While directivity is important, recording prevention using ultrasound is even more challenging because the size of meeting rooms where ultrasonic recording prevention is used varies and the positions of meeting participants are not fixed.

[0006] Taking these problems into account, the inventors of the present invention have proposed a method for tracking the location of a participant or a recorder and focusing ultrasound based on this.

[0007] The objective of the present invention is to provide a recording prevention system and method that overcome the problems of ultrasonic output limitation and attenuation caused by obstacles, and can perform recording prevention according to the user environment.

[0008] To achieve the above objective, the present invention discloses a recording prevention system capable of preventing unauthorized recording within a space. The recording prevention system of the present invention comprises a plurality of jamming modules, a steering module, a sensor module, and a control unit. The jamming module outputs a jamming wave, implemented as an ultrasound, toward a target for preventing unauthorized recording. The steering module adjusts the direction of the jamming waves of the plurality of jamming modules individually or in groups. The sensor module detects the target to determine the position or direction of the target. The control unit determines the direction of the jamming of the plurality of jamming modules according to the measurement result of the sensor module and controls the steering module so that the plurality of jamming modules aim toward the target.

[0009] Example of a sensor module

[0010] According to an embodiment, the sensor module may be implemented with at least one selected from: an ultrasonic sensor for detecting the human body that is the target; a camera that captures the target to generate an image in order to confirm the position or direction of the target by confirming the contour of the target through image processing; and a heat detection sensor or a thermal imaging camera that measures heat generated from the target.

[0011] Combination of the canceling part

[0012] According to another embodiment, the recording prevention system may further include a canceling unit that outputs a canceling sound wave to cancel the voice toward the target speaking person. In this case, the control unit controls the canceling unit and the jamming module to operate simultaneously, or controls the canceling unit and the jamming module to operate selectively or alternately.

[0013] According to an embodiment, the canceling unit may include a microphone for acquiring the voice, a signal processing unit for generating the canceling sound wave using the voice signal generated by the microphone, and a speaker for transmitting the canceling sound wave generated by the signal processing unit.

[0014] Combination of remote controllers or mobile modules

[0015] According to another embodiment, the recording prevention system may further include a remote controller that provides a user interface capable of setting the location or direction of the target and the direction of the jamming module, and receives control commands from the user and provides them to the control unit.

[0016] According to another embodiment, the recording prevention system may further include a moving module that moves the position of the jamming module.

[0017] Example of a steering module

[0018] According to an embodiment, the steering module may adjust the direction of the jamming module by including a jamming module support means and a jamming module steering means. The jamming module support means supports the jamming module in a structure that allows it to rotate about a vertically arranged rotation axis. The jamming module steering means provides the jamming module support means with a rotational force that enables the jamming module support means to rotate within a certain range about the rotation axis.

[0019] Here, the jamming module support means may include a jamming module pivot member and a rotation support member. One side of the jamming module pivot member is connected to the jamming module steering means and the other side is coupled to the jamming module to rotate about the rotation axis, and the rotation support member is coupled perpendicularly to the jamming module pivot member to become the rotation axis.

[0020] Additionally, the jamming module steering means may include a connecting member and a jamming module driving unit when an elongated hole is provided on one side of the jamming module rotating member in a direction toward the rotating support member. The connecting member is implemented in a rod shape that fits into the elongated hole, and the jamming module driving unit reciprocates the connecting member along a straight section so that the jamming module rotating member undergoes angular motion.

[0021] Here, the jamming module rotating member may be implemented by including a substrate support bar connected to both sides of the substrate of the jamming module, a rotating bar extending from the substrate support bar and having an elongated hole formed therein to which the connecting member is connected, and an axial insertion part formed between the substrate support part and the connecting part of the rotating bar so that the rotating support member is inserted.

[0022] The above jamming module drive unit may include a solenoid actuator equipped with a plunger.

[0023] Recording prevention method of a recording prevention system

[0024] The present invention also extends to a recording prevention method of a recording prevention system. The recording prevention method of the present invention comprises the steps of: a sensor module detecting a target for preventing unauthorized recording and determining the jamming direction of a plurality of jamming modules according to the measurement result of the sensor module; a steering module adjusting the jamming direction of the plurality of jamming modules individually or in a group according to the determined direction; and the jamming module outputting a jamming wave implemented as ultrasound toward the target.

[0025] According to an embodiment, the recording prevention method of the present invention may further include: a step of measuring the intensity of the voice of a target speaking person; a step of outputting a canceling sound wave to cancel the voice when the intensity of the voice is greater than a predetermined standard; and a step of simultaneously performing the step of outputting the canceling sound wave and the step of outputting the jamming wave, or selectively or alternately performing the step of outputting the canceling sound wave and the step of outputting the jamming wave.

[0026] The recording prevention system of the present invention significantly improves recording prevention performance compared to conventional ultrasonic jammers by configuring it to concentrate ultrasonic waves at a target recording location. That is, when operating equipment of the same specifications, conventional equipment can jam by outputting ultrasonic waves through only one speaker in a 3m proximity area due to the directional nature of ultrasonic waves, whereas the recording prevention system of the present invention can improve the recording prevention effect by concentrating, for example, 10 or more ultrasonic speakers at a single location.

[0027] In addition, the recording prevention system of the present invention further enhances the recording prevention effect by performing voice canceling simultaneously with or alternately with ultrasonic jamming to attenuate the volume of sound recorded by the recorder. This operation of the present invention can effectively respond to situations where ultrasonic jamming performance is reduced due to obstacles or where it is difficult to focus the ultrasonic speaker module.

[0028] FIG. 1 is a block diagram of a recording prevention system according to one embodiment of the present invention,

[0029] FIG. 2 is a plan view illustrating the combined state of a plurality of jamming modules and a steering module according to an embodiment of the present invention.

[0030] FIG. 3 is a side cross-sectional view of a set of jamming modules and steering modules shown in FIG. 2.

[0031] FIG. 4 is a perspective view of a set of jamming modules and steering modules shown in FIG. 2.

[0032] FIG. 5 is a usage state diagram for explaining the operation process of a steering module according to an embodiment of the present invention,

[0033] FIG. 6 is a configuration diagram of a moving module according to an embodiment of the present invention,

[0034] FIG. 7 is a block diagram of a canceling unit according to an embodiment of the present invention, and

[0035] FIG. 8 is a flowchart illustrating a recording prevention operation according to one embodiment of the present invention.

[0036] The present invention will be described in more detail below with reference to the drawings.

[0037] Referring to FIG. 1, a recording prevention system (1) according to one embodiment of the present invention includes a plurality of jamming modules (10), steering modules (20), movement modules (30), sensor modules (40), canceling units (50), remote controllers (60), and control units (70).

[0038] The jamming module (10) generates ultrasonic waves under the control of the control unit (70) and emits ultrasonic jamming waves in the direction of the target. The target may be a recording device performing a recording, as well as a person speaking. The jamming module (10) may be composed of a circuit that generates ultrasonic signals, a PCB, and a speaker, and the detailed configuration may use components known in the prior art field.

[0039] The recording prevention system (1) includes a plurality of jamming modules (10). The plurality of jamming modules (10) may be implemented in a single housing or installed in multiple housings. The plurality of jamming modules (10) may be divided into several jamming groups (hereinafter referred to as 'jammer groups') and controlled. A jamming group consists of one or two or more jamming modules (10). For example, FIG. 5 shows an example where two jamming groups are arranged, and each jamming group consists of three jamming modules. When arranging the plurality of jamming modules (10), the spacing between the jamming modules (10) as well as the spacing between the jamming groups can be arbitrarily designed, and, for example, they can be arranged in a two-dimensional array form or arranged in an overlapping manner in three dimensions.

[0040] The steering module (20) is for controlling the ultrasonic emission direction of a plurality of jamming modules (10) and can concentrate the jamming waves toward a specific target. The steering module (20) can control the aiming direction of each jamming module (10) or control the aiming direction in a jammer group unit, and can control the entire plurality of jamming modules (10) to aim at a single target as well as to aim at multiple targets.

[0041] Referring to FIGS. 2 to 4, the steering module (20) is equipped with a support means (22) connected to the jamming module (10) and a steering means (24) for adjusting the direction of the support means (22). As previously described, the steering module (20) may control the attitude of a single jamming module (10) or may simultaneously control the attitudes of multiple jamming modules (10) in a jammer group. FIG. 2 is an example in which the steering module (20) is a structure for controlling the attitudes of multiple jamming modules (10), and multiple support means (22) are connected to a single steering means (24).

[0042] The support means (22) is connected to one side of the jamming module (10) and comprises a rotating member (222) that moves angularly by an external force provided by a steering means (24), and a rotational support member (224) that acts as a rotation axis and supports the rotating member (222) to rotate. The rotating member (222) comprises a substrate support bar (222a), a rotating bar (222b), and an axis insertion part (222c).

[0043] The substrate support bar (222a) supports the rear surface of the substrate of the vertically positioned jamming module (10). The substrate support bar (222a) stably supports the substrate of the jamming module (10) by forming a triangle with multiple rods, one end of which extends from the pivot bar (222b) and the other ends of which are connected to both sides of the rear surface of the substrate of the jamming module (10).

[0044] The pivot bar (222b) is a rod-shaped member extending from the substrate support bar (222a), and a steering means (24) is attached to the rear end. To be connected to the steering means (24), an elongated hole (222d) is formed at the rear end of the pivot bar (222b) to which a connecting member (242) of the steering means (24) is connected. Here, the elongated hole (222d) controls the rotational range of the pivot bar (222b), which is supported by the connecting member (242) and moves angularly.

[0045] The shaft insertion part (222c) supports a rotational support member (224) that serves as the rotational axis of the rotational member (222). The shaft insertion part (222c) is formed at the connection portion between the substrate support part (222a) and the rotational bar (222b) to support the rotational support member (224). The rotational support member (224) is inserted into the shaft insertion part (222c) as the rotational axis of the rotational member (222) and is positioned perpendicular to the orientation direction of the jamming module (10). The rotational support member (224) remains in a fixed position despite the rotation of the jamming module (10) and serves as a steering axis. In the example of FIG. 3, the rotational support member (224) is fixed vertically at both ends of the case that accommodates the jamming module (10).

[0046] The steering means (24) includes a connecting member (242) that provides rotational force to a rotating member (222) and a jamming module driving unit (244) that moves the connecting member (242). The jamming module driving unit (244) provides reciprocating motion to the connecting member (242) that moves along a straight section, and, for example, a solenoid actuator (simply referred to as a 'solenoid') equipped with a plunger may be used. The connecting member (242) is connected to the plunger of the solenoid and is inserted into and supported in an elongated hole (222d). In the case where multiple rotating members (222) are arranged side by side to control multiple jamming modules (10) simultaneously as in FIG. 2, the connecting member (242) is inserted into the elongated holes (222d) of all the multiple rotating members (222), thereby allowing the directional direction of the multiple jamming modules (10) to be controlled simultaneously. The connecting member (242) can be implemented with a long rod having a male screw and two nuts that are screw-coupled to the rod and fix the position where they are coupled to the elongated holes (222d). Additionally, the width between the two nuts determines the range of the rotation angle of the jamming module (10).

[0047] The operation process of the steering module (20) disclosed in FIGS. 2 to 4 is briefly explained below. When the control unit (70) provides a driving signal to the jamming module driving unit (244) to rotate the jamming module (10) toward the target direction, the jamming module driving unit (244) pushes or pulls the connecting member (242) along a straight section. When the connecting member (242) moves along the straight section, the rotating bar (222b) rotates around the rotational support member (224) as an axis, and the substrate support bar (222a) also rotates. Accordingly, the jamming module (10) rotates in the opposite direction to the movement of the connecting member (242) and aims toward the target. At this time, the slot (222d) connecting the connecting member (242) and the rotating bar (222b) must be long enough to create space for the rotating bar (222b) to move as the linear motion changes into angular motion. When the jamming module driving unit (244) moves the connecting member (242) in the opposite direction, the rotating member (222) also rotates in the opposite direction, and the jamming module (10) rotates in the opposite direction. Referring to FIG. 5, multiple jamming modules (10) divided into two jammer groups as in FIG. 2 are installed under the table of a conference room. The jamming modules (10) of each group are rotated at the same angle relative to the connecting member (242), and both groups of jamming modules (10) are directed toward the same target, the conference room members.

[0048] FIGS. 2 to 4 are embodiments of the steering module (20), but the present invention is not limited thereto. Those skilled in the art will understand that the mechanism of the steering module (20) may be replaced in a different way. Furthermore, it will be understood that the operation method of the present invention may be applied differently in cases other than a conference room environment as shown in FIG. 5.

[0049] Referring again to FIG. 1, the remaining configuration of the recording prevention system (1) will be described. The movement module (30) is a means for moving the position of at least one jamming module (10) or jammer group. In the case where at least one jamming module (10) or a jammer group unit has an individual housing (10A) as in FIG. 6, the movement module (30) can be moved in a housing unit. If the steering module (20) adjusts the orientation direction from the current position, the movement module (30) is a means for changing the position. The movement module (30) moves the jamming module (10) closer to the target, and the steering module (20) rotates the jamming module (10) to aim at the target. The movement module (30) operates in conjunction with the steering module (20) to enable the jamming module (10) to accurately aim at the target and concentrate the jamming.

[0050] For example, FIG. 6 illustrates an example of a moving module (30) positioned at the rear of a table to transport a housing (10A) of a jammer group. The moving module (30) transports the housing (10A) along the x-axis and y-axis by including an x-axis rail (601) installed along the x-axis direction on the lower side of the table, a y-axis rail (603) that transports the housing (10A) along the y-axis while transporting it in a straight line along the x-axis rail (601), and a cargo block (605) that suspends the housing (10A) and transports it along the y-axis rail (603). If the housing (10A) only needs to be transported in the x-axis direction, the moving module (30) is sufficient with the x-axis rail (601) and the cargo block that suspends the housing (10A) and transports it along the x-axis rail (601). The transfer of the y-axis rail (603) or cargo block (605) may be carried out using conventionally known methods, such as a combination of a motor and gears or a chain. Even if not the method of FIG. 6, the moving module (30) may include any mechanism that moves an object within a defined section according to conventional technology.

[0051] The sensor module (40) detects the position or direction of the target. If there is a detection result from the sensor module (40), the control unit (70) determines the position and direction of the target using the detection result.

[0052] When a participant seated in a conference room becomes the target, the sensor module (40) may be an ultrasonic sensor installed under the table to recognize the position of the participant's body, or a vision means installed under the table to photograph the participant and confirm the participant's outline in the image. If the vision means recognizes a mobile phone in the participant's pocket, that pocket may become the target. Additionally, the sensor module (40) may be a thermal sensor or a thermal imaging camera that detects heat from an electronic device operating in a pocket or bag. Furthermore, a CCTV installed in the conference room may also serve as the sensor module (40), and the ultrasonic sensor, vision means, thermal imaging camera, thermal sensor, and CCTV may be combined to implement the system.

[0053] The canceling unit (50) is for canceling the voice of a participant and can be operated to selectively transmit a canceling signal along with the ultrasonic signal of the jamming module (10). Referring to FIG. 7, the canceling unit (50) may include a microphone (501) that receives the voice of a target and generates a voice signal, a signal processing unit (503) that generates a canceling sound wave for the voice signal generated by the microphone (501), and a speaker (505) that outputs the canceling sound wave generated by the signal processing unit (503) toward the target.

[0054] The signal processing unit (503) may use, for example, the noise canceling system and canceling method of Korean published patent KR 10-2008-0041589 A. Meanwhile, Korean registered patent KR 10-0735557 B discloses a method and apparatus for disrupting a voice signal by attenuating the voice signal and simultaneously masking it, and a specific circuit block diagram is disclosed. In addition, noise canceling related technologies are known through many patents and products.

[0055] The remote controller (60) is a device that generates control commands according to user operation and provides them remotely to the control unit (70), and the user of the system of the present invention can directly control the recording prevention system (1) using the remote controller (60). The remote controller (60) may be, for example, a user terminal or server connected to a network and having an application that performs remote control functions installed, or it may be a remote control using infrared, etc.

[0056] The remote controller (60) can generate control commands regarding the output, position, direction, output frequency, and hopping method of the jamming module (10), and receive various setting values ​​from the user, such as the criteria for canceling and the on / off of the system. The remote controller (60) provides a user interface for inputting control commands or setting values, and transmits the control commands or setting values ​​received from the user to the control unit (70). For example, if the position or direction of the target detected by the sensor module (40) is incorrect, the user can directly adjust whether the movement module (30) moves, the position of movement, and the direction of the jamming module (10) by operating the remote controller (60).

[0057] The control unit (70) controls the overall operation of the recording prevention system (1) of the present invention. The control unit (70) controls the movement module (30) and the steering module (20) and controls the jamming of the plurality of jamming modules (10) according to the measurement result of the sensor module (40) or the control of the remote controller (60).

[0058] When the system is initially configured, the control unit (70) obtains information regarding the individual positions and relative positional relationships of each module, such as the positions of multiple jamming modules (10), the positions of sensor modules (40), and movement ranges. The relative positions between devices within the space where the target is located can be tracked through a common spatial coordinate system, such as an optical tracking system (OTS), which is a known technology widely used in the implementation of medical robot systems, for example. In the case of a fixed position under a conference room table or simple movement via a rail under a conference room table, control can be sufficiently achieved by setting the positions of the modules in advance rather than introducing a system such as an OTS.

[0059] FIG. 8 is a flowchart for explaining the operation of the recording prevention system (1) of FIG. 1 according to an embodiment of the present invention. Based on this, the correlation and control method between each module and the control unit (70) will be explained.

[0060] <Target Location Confirmation: S100>

[0061] When the system starts, the sensor module (40) detects the location and direction of the target. The system may start by turning on a switch that starts the system, or the control unit (70) may start the operation of the sensor module (40) by transmitting a start command through a remote controller (60). There may be various ways in which the system is started, but the present invention is not limited thereto.

[0062] The sensor module (40) can determine the location of a participant by using an ultrasonic sensor capable of detecting the participant's human body position, a thermal imaging camera, a camera for collecting non-identification data, a CCTV, etc. The specific sensor can be mounted within the same housing as the jamming module (10). For example, multiple devices containing both the jamming modules (10) and the sensor module (40) can be installed under a conference room table. In the case of the ultrasonic sensor, the participant's seated status and location can be determined based on the round-trip time of the reflected signal. Additionally, a camera can be embedded in the same location, and the location can also be determined through a CCTV installed indoors.

[0063] As mentioned above, it is also possible to directly detect electronic devices with recording functions other than the human body, such as a thermal imaging camera that detects heat generated by electronic devices, a special detector that detects wireless signals of a specific frequency, and a participant's pocket shape and bag, etc., as arbitrary locations where electronic devices are presumed to be located.

[0064] The control unit (70) finally determines the position of the target using the measurement result of the sensor module (40).

[0065] <Control of position and direction of jamming module: S200>

[0066] When the location of the target is determined in S100, the control unit (70) determines the location or orientation direction of each jamming module (10) and controls the movement module (30) and the steering module (20) so that the jamming module (10) is aimed at the target. The location and orientation direction of the jamming module (10) may be determined individually or as a jamming group unit.

[0067] <Jamming Wave Sender: S300>

[0068] When the position and orientation direction of the jamming module (10) are determined in step S200, the control unit (70) controls the jamming module (10) to emit a jamming wave.

[0069] <Voice Cancelling Based on Voice Intensity Measurement: S400 to S600>

[0070] The control unit (70) may control the canceling unit (50) to operate simultaneously with the jamming module (10), or may selectively or alternately control one of the canceling unit (50) and the jamming module (10) to operate.

[0071] The canceling unit (50) periodically and non-periodically acquires the voice of a participant using a microphone (501), measures the intensity, and determines whether it is greater than a predetermined threshold.

[0072] If the voice intensity of a participant is greater than a predetermined threshold, the control unit (70) controls the signal processing unit (503) to perform a canceling event that reduces the voice intensity. The signal processing unit (503) generates a canceling signal to cancel the voice according to the control of the control unit (70) and outputs it through the speaker (505).

[0073] According to an embodiment, when it is difficult to distinguish between voice and noise in the sound collected through the microphone (501), the intensity of the total sound can be compared with a reference value, and then a canceling signal for the total sound can be generated and output. Since the canceling signal attenuates the signal entering the recorder, it can be used in conjunction with other methods when it is difficult to prevent unauthorized recording by ultrasonic jamming, such as when the location of the recorder is unclear, when it is difficult to directly jam the ultrasonic due to obstacles, or when the ultrasonic output is insufficient to prevent recording.

[0074] The recording prevention operation of the recording prevention system (1) of the present invention is performed in the manner described above. The present invention enhances the jamming effect by concentrating the ultrasonic signal and supplements the deficiencies of ultrasonic jamming by simultaneously performing voice attenuation through canceling.

[0075] Although embodiments of the present invention have been described so far, it will be understood by those skilled in the art that the present invention can be easily modified or partially substituted within the scope of the technical spirit of the present invention without departing from the technical concept.

[0076] Example of implementation

[0077] For example, some of the components of the recording prevention system (1) of FIG. 1 are not functionally essential, and therefore the present invention is not required to include all components of FIG. 1. For example, the movement module (30), remote controller (60), and canceling unit (50) may be selected when configuring the system. In addition, the movement module (30), steering module (20), canceling unit (50), etc., may be implemented using various known technologies, and the present invention is not limited thereto.

[0078] Although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the invention as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present invention.

Claims

1. In a recording prevention system for preventing unauthorized recording within a space, Multiple jamming modules that generate and transmit ultrasonic jamming waves toward a target to prevent unauthorized recording; A steering module that adjusts the jamming wave directional direction of the plurality of jamming modules individually or in groups; A sensor module for detecting the target to determine the position or direction of the target; and A recording prevention system characterized by including a control unit that determines the jamming orientation direction of the plurality of jamming modules according to the measurement result of the sensor module and controls the steering module so that the plurality of jamming modules aim at the target.

2. In Paragraph 1, The above sensor module is, Ultrasonic sensor for detecting the human body that is the target above; A camera that captures the target to generate an image in order to confirm the position or direction of the target by confirming the outline of the target through image processing; and A recording prevention system characterized by being implemented with at least one of a heat detection sensor or a thermal imaging camera that measures heat generated from the above target.

3. In Paragraph 1, It further includes a canceling unit that outputs a canceling sound wave to cancel the voice toward the target speaking person, and A recording prevention system characterized by the above-described control unit controlling the canceling unit and the jamming module to operate simultaneously, or controlling the canceling unit and the jamming module to operate selectively or alternately.

4. In Paragraph 3, The above canceling unit is, A microphone for acquiring the above voice; A signal processing unit that generates the canceling sound wave using the voice signal generated by the microphone; and A recording prevention system characterized by including a speaker that emits a canceling sound wave generated by the above signal processing unit.

5. In Paragraph 1, A recording prevention system characterized by further including a remote controller that provides a user interface capable of setting the position or direction of the target and the direction of the jamming module, and receives control commands from the user and provides them to the control unit.

6. In Paragraph 1, A recording prevention system characterized by further including a moving module for moving the position of the jamming module.

7. In Paragraph 1, The above steering module is, A jamming module support means that supports the jamming module in a structure capable of rotating around a vertically arranged rotation axis; and A recording prevention system characterized by adjusting the direction of the jamming module by including a jamming module steering means that provides the jamming module support means with a rotational force that allows the jamming module support means to rotate within a certain range based on the rotation axis.

8. In Paragraph 7, The above jamming module support means is, A jamming module rotation member having one side connected to the jamming module steering means and the other side coupled to the jamming module to rotate about the rotation axis; and A recording prevention system characterized by including a rotational support member that is vertically coupled to the above-mentioned jamming module rotational member and serves as the rotational axis.

9. In Paragraph 8, An elongated hole is provided on one side of the above-mentioned jamming module rotating member in a direction toward the above-mentioned rotational support member, and The above jamming module steering means is, A rod-shaped connecting member fitted into the above-mentioned slot; and A recording prevention system characterized by including a jamming module driving unit that reciprocates the connecting member along a straight section so that the jamming module rotating member moves angularly.

10. In Paragraph 9, The above jamming module rotating member comprises a substrate support bar connected to both sides of the substrate of the jamming module, a rotating bar extending from the substrate support bar and having an elongated hole formed therein to which the connecting member is connected, and an axial insertion portion formed between the substrate support portion and the connecting portion of the rotating bar so as to insert the rotating support member. A recording prevention system characterized in that the above-mentioned jamming module drive unit includes a solenoid actuator equipped with a plunger.

11. In a recording prevention method to prevent unauthorized recording, A step in which a sensor module detects a target for preventing unauthorized recording, and determines the jamming direction of a plurality of jamming modules according to the measurement result of the sensor module; A step in which the steering module adjusts the jamming direction of the plurality of jamming modules individually or in groups according to the direction determined above; and A recording prevention method characterized by including the step of the jamming module outputting a jamming wave implemented as ultrasound toward the target.

12. In Paragraph 11, A step of measuring the intensity of the voice of the target speaking person; A step of outputting a canceling sound wave to cancel the voice when the intensity of the voice is greater than a predetermined standard; and A recording prevention method characterized by further including a step of simultaneously performing the step of outputting the canceling sound wave and the step of outputting the jamming wave, or selectively or alternately performing the step of outputting the canceling sound wave and the step of outputting the jamming wave.

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