KR101475786B1 - Anti-eavesdropping device applied to the building's open space and method thereof - Google Patents

Abstract

The present invention relates to an anti-eavesdropping device applied to an open space of a building and a method thereof. The device includes: an sectional noise collection unit (M11-M16) which transmits noise information per each section when it is determined that people are in an open space of a building; sectional anti-eavesdropping speakers (S11-S66); a noise masking generation unit (200) which generates and outputs an anti-eavesdropping noise masking signal; a central memory unit (310) which stores speaker location information; and a central control unit (300) which controls to be transmitted to the noise masking generation unit (200) after generating anti-eavesdropping speaker search list information.

Description

[0001] The present invention relates to an anti-eavesdropping device applied to an open space of a building,

The present invention relates to a method for acoustically dividing an open space, which is a place where an interior space is opened without a wall inside a building, into a compartment, and prevents tapping only around the compartment where conversation is taking place among the divided compartments And more particularly, to a device and a method for preventing conversation eavesdropping applied to an open space of a building, which reduces the driving power cost required to prevent important information and prevent eavesdropping by controlling the noise masking signal for preventing eavesdropping .

In modern society, personal information and conversation contents are treated as advanced information as much as in the information age, and the cases of tapping or recording are increasing.

In other words, in the industry, intense information transfer is taking place in the company, such as discussions for understanding strategies of competitors and in-depth idea meetings of strategic technologies, so that companies with malicious intent can steal unauthorized through eavesdropping or industrial espionage There is a lot of activity to do. For example, the National Intelligence Service of the Republic of Korea has announced that the amount of damage caused by industrial espionage (estimated by industry) is about 90 trillion won over the period from 2003 to July, 2006, for 3 years and 7 months.

The eavesdropping is divided into conversation eavesdropping (local eavesdropping) which secretly listens to conversation contents in the local area such as the office where the conversation is intercepted and the conversation eavesdropping to intercept the conversation contents in the communication network.

Accordingly, an eavesdropping prevention apparatus and method using a conventional power line (Korean Patent Registration No. 10-0906157) has been proposed as an eavesdropping prevention apparatus for preventing eavesdropping on the telephone.

A conventional apparatus and method for preventing an eavesdropping using a power supply line includes a signal detector for receiving only a very limited frequency through a power line and detecting a signal to be intercepted and for filtering the signal through at least one frequency band And a noise masking noise signal output unit for outputting a noise masking noise signal to the power line according to whether the wired signal is present or not, and a control unit for receiving the filtered signal from the signal detection unit, And the like.

A device for preventing eavesdropping to prevent conversation eavesdropping. A device for preventing conversation eavesdropping covers a conversation voice by emitting noise, so that a sound that prevents eavesdropping by outputting a noise signal for preventing eavesdropping so that conversation voice can not be recognized even if eavesdropping A sound masking method has been proposed.

Here, sound masking refers to a hearing phenomenon that is difficult to hear a certain sound, that is, a target sound due to another sound. That is, when the surroundings are noisy, the telephone sound can not be heard. The sound (intended sound) to be heard is masked (masked) to other sounds (interfering sound) so that it can not be eavesdropped.

However, the conventional apparatus for preventing conversation eavesdropping for preventing conversation eavesdropping has the following problems.

Currently, industrial and research facility-based offices, the National Assembly, government offices for security, offices providing legal services, and other places that require tapping and transcription prevention require an open space with no internal walls There is a problem in that the operation cost is increased because the noise signal for preventing the eavesdropping is outputted in the entire open space of a large scale over the 24 hours.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for acoustically dividing an open space in which an interior space is opened without a wall inside a building into acoustically divided sections, And a noise masking signal for preventing the eavesdropping, which is noise information for preventing eavesdropping, to be output only to the vicinity of the compartment where the conversation is proceeding.

In order to accomplish the present invention, an apparatus for preventing conversation eavesdropping applied to an open space of a building according to the present invention is characterized in that an open space in which an inner space is opened without a wall inside a building is divided into acoustic compartments, And a noise level detector for detecting a noise level of each of the divided compartments, wherein the noise level information is divided into a plurality of divided compartments, With horns; A plurality of speakers for each of the divided compartments; A noise masking generator for individually generating a noise masking signal for preventing the eavesdropping and outputting the generated noise masking signal through the speaker for intercepting the eavesdropping of each divided block; The open position of the building is represented by a figure, the open place of the building indicated by the figure is divided into sections, and the positions of the noise collectors of the divided sections and the speakers A central memory unit for storing the position information of the split compartment of the building open position and the speaker position information; The noise information for each divided section is received from the noise collecting section for each divided section and the transmitted noise information for each divided section is matched with the speaker section position information and the speaker position information of the divided open space of the building stored in the central memory section, The speaker for the eavesdropping block for each of the neighboring divided sections is searched and extracted based on the noise collecting section for each of the divided sections for which the noise information per zone has been transmitted, and the designated partition for displaying the eavesdropping speaker for each divided section extracted by the search And a central control unit for controlling the noise masking generator to generate the noise suppression search list information and transmit the noise suppression search list information to the noise masking generator, Only the loudspeakers for intercepting eavesdropping are output. The acoustic noise insulation layer for preventing the occurrence of eavesdropping is constructed along the peripheral (perimeter) section of the noise collection section according to the divisional division transmitting the noise information for each divided section, And the acoustical sound insulating layer of the conversation occurrence area for preventing the tact is formed according to the installation position of the noise collecting part according to the divided section.

Wherein the noise collecting unit for each of the divided sections comprises: a microphone for each divided section into which noise generated in the corresponding section is input; A voice converter configured to generate noise information for each of the divided sections, which is information indicating a magnitude of noise generated in the corresponding section input through the microphones for each divided section; A memory unit for each of the divided compartments storing unmanned reference noise information for each of the compartments, which is a magnitude of noise measured when no one is present in the compartment; It is determined that there is a person in the case where the noise information per unattached reference is larger than the unmanned reference noise information in comparison with the unmanned reference noise information in the memory section according to the divided section and the noise information according to the divided section generated by the sound converting section according to the divided section And a control unit for controlling the noise information to be transmitted to the central control unit.

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Wherein the masking memory unit is provided with a noise masking generator which is connected to the noise collecting unit for each divided compartment, The noise masking level information for preventing eavesdropping for each divided section having a measured noise level is stored and the noise masking generator recognizes speakers for eavesdropping by the divided partitions indicated in the speaker search list information for the specified section noise, The sound pressure level of the measured noise level information for preventing the eavesdropping of each of the divided sections of the eavesdropping loudspeakers for each of the divided partitions displayed in the designated partition noise canceling loudspeaker search list information extracted by matching the loudspeakers for the eavesdropping by the compartments with the masking memory part So that the noise masking signal for preventing the eavesdropping is outputted Then it controls so that the divided blocks by tapping off an individual output for each of the speakers.

The process of establishing the acoustical sound insulation layer in the dialog generation area for preventing the eavesdropping around the specific compartment of the open space where the noise is generated in the huge open space of the building using the apparatus for preventing conversation tearing applied to the open space of the building of the present invention, Measuring an amount of noise at every predetermined interval in each of the divided compartments of the divided compartments installed in the divided compartments, which is an area where the compartments are divided; Determining whether there is noise measured at the noise collecting part according to each of the divided partitions; The measured noises of each divided section are compared with the measured noises of the divided sections and the noise information of the divided sections is measured by the noise collecting section of each divided section, Determining whether the noise information of each divided section is larger than the unmanned reference noise information by comparing the reference noise information; Transmitting noise information for each of the divided sections to the central controller when the noise information for each divided section is larger than the unmanned reference noise information; The central control unit receives the noise information of each divided section and matches the transmitted noise information of each divided section with the sound information of the divided section of the open space of the building and the speaker position information stored in the central memory unit, The speaker for the eavesdropping block for each of the neighboring divided blocks is searched and extracted based on the noise collecting portion for each of the divided subdivisions to which the information is transmitted, Generating speaker search list information and transmitting it to the noise masking generator; The noise masking generator recognizes the speakers for eavesdropping according to the divided partitions indicated in the transmitted information of the speaker search list for blocking the noise of the specified section and transmits the measured sound level information for preventing eavesdropping to each divided section Generating noise masking signals for preventing eavesdropping adjusted by the frequency magnitude of the measured noise level information for preventing the eavesdropping by the divided partitions of the speakers for eavesdropping by the divided partitions displayed in the search list information for the designated subdivisions for matching with the specified subdivisions to be extracted, ; The noise masking signal for preventing the eavesdropping which is adjusted by the frequency magnitude of the measured noise level information for preventing eavesdropping by the divided partitions of the eavesdropping loudspeakers for each of the divided partitions displayed in the designated partition noise canceling speaker search list information, Separately for each of the plurality of eavesdropping loudspeakers for each of the divided partitions corresponding to the noise masking signals for prevention; The noise masking signals for preventing the eavesdropping transmitted from the speakers for intercepting the eavesdropping for each of the divided sections are outputted and the eavesdropping sound is generated along the peripheral section of the noise collecting section for each divided section, And establishing an acoustically soundproofing layer for preventing a dialogue occurrence zone.

When the noise information for each divided section is larger than the unmanned reference noise information, transmitting the generated noise information for each divided section to the central control unit in the noise collecting unit for each divided partition, Wherein the noise collection unit for each divided block is controlled to transmit the repeated noise information for each divided block generated to the central control unit only when the noise information for each divided block is generated for a predetermined number of times or more than the predetermined number of times Function.

The present invention relates to a method for preventing the occurrence of eavesdropping, which is noise information for preventing eavesdropping only in the vicinity of a compartment where conversation is taking place among a plurality of divided spaces, by dividing an open- The noise masking signal is output so that the driving power cost required for performing the eavesdropping prevention is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram showing an apparatus for preventing conversation eavesdropping applied to an open space of a building of the present invention; Fig.
FIG. 2 is a view showing noise collecting parts according to divided partitions divided and installed in an open place of a building among constituent devices for preventing conversation eavesdropping applied to an open space of a building of the present invention,
FIG. 3 is a block diagram showing in detail a noise collecting part according to the present invention, which is partitioned and installed in an open space of a building,
FIG. 4 is a view illustrating a process in which an acoustical soundproofing layer for a conversation occurrence area for preventing eavesdropping is constructed around a specific compartment of an open space where noise is generated in a huge open space of a building using a device for preventing conversation tearing applied to an open space of a building of the present invention Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration and an operation of an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic configuration view showing a device for preventing conversation eavesdropping applied to an open space of a building according to the present invention. FIG. 2 is a block diagram showing a configuration of a device for preventing conversation eavesdropping applied to an open space of a building according to the present invention. FIG. 3 is a block diagram showing a configuration of an apparatus for preventing conversation eavesdropping applied to an open space of a building according to an embodiment of the present invention. FIG. 4 is a block diagram showing details of a noise collecting part according to a divided partition divided and installed; and FIG. 4 is a block diagram showing details of an open space in which a noise is generated in a huge open space of a building using a device for preventing conversation e- A flowchart showing the process of establishing the acoustic sound insulation layer in the dialog occurrence area for preventing eavesdropping around the compartment The.

As shown in the figure, the apparatus for preventing the interactive eavesdropping applied to the open space of the building of the present invention mainly includes the sound collecting units M11 ... M66 for the divided compartments, the sound intercepting speakers S11 ... S66 for the divided compartments, A generator 200, a central memory unit 310, and a central control unit 300. [

First, the noise collecting units M11 ... M66 of the divided compartments are divided into compartments, which are open spaces (OP) where the internal space is open without a wall inside the building, and each of the divided compartments Which are installed to be able to individually control whether or not a person exists in the divided partitioning place, and transmit the noise information of the divided partition measured in the corresponding partition when it is determined that there is a person.

In this case, the facilities to which the open space (OP) of the building is applied include offices based on industrial and research facilities, government offices for security, offices providing legal services, offices requiring hospitals and counseling rooms, to be.

The detailed configuration of the noise collecting units M11 ... M66 of the divided compartments to perform the functions is as follows. The noise generated from the compartments is inputted through the microphones 110 and the dividing compartments 110, A sound converting unit 120 for each divided section to generate noise information (in units of dBA) per divided section, which is information indicating the size of noise generated in the relevant section, The noise level information of the unmanned reference noise of the memory unit 130 according to the divided partition and the memory unit 130 according to the divided partition in which the reference noise information (unit: dBA) It is determined that there is a person in the case where the noise information per the divided section is larger than the unmanned reference noise information in preparation for the noise information so that the noise information for each divided section measured in the corresponding section is transmitted to the central control unit 300 It comprises a comparison determination unit 140 by a split pane.

In this case, when the noise information of each divided section is not a conversation among people but a temporary noise (for example, a door noise or a single noise in which an object falls), the comparative judgment unit 140) generates only repeatedly generated noise information for each divided compartment that is larger than the predetermined number of times (for example, 10 times) the unmanned reference noise information for a predetermined time (for example, one minute) And the noise information of each divided section is programmed to be transmitted to the central control unit, thereby maximizing the reduction of the driving power cost required to perform the eavesdropping prevention.

The reason for using 'dBA' as a unit of the noise information of unmanned reference by each zone is as follows.

"DB" is used as the unit of the intensity of the noise, and the sound level that the human can hear is 0 to 120 dB or more. Since the physical value of "dB" is insufficient to measure noise, several factors are considered to compensate for the damage assessment and social response of people exposed to noise more appropriately. In other words, even if the same note is heard, the degree of feeling of the sound varies depending on the condition, condition, and working environment of the listener.

To do this, the noise level must be corrected by adding or subtracting many correction factors to the numerical level measured by the machine. A, B, C, and D indicate the level of the sensory level of the normal sound by frequency correction according to the characteristics of the sound. Among them, the A characteristic is corrected by taking into consideration the auditory characteristic which indicates a sensitive response It is generally used to evaluate the noise level and is used in units such as dB (A).

The eavesdropping loudspeakers (S11 ... S66) for each of the divided sections are installed in the same compartment as the noise collecting sections (M11 ... M66) for the respective divided sections, and a noise masking signal for preventing the eavesdropping is output, An acoustic sound-proofing layer SP is formed around the noise collecting sections M11 ... M66 provided for the respective divided sections, and a noise masking signal for preventing the eavesdropping is outputted only to the section where the conversation proceeds between the people, Thereby reducing the driving power cost required to perform the protection.

The noise masking generator 200 is connected individually by allocating individual channels to one acoustically partitioned section of the noise collecting units M11 ... M66 of the divided part, And outputs it through the speaker for interception blocking (S11 ... S66) according to the divided partitions.

To this end, the noise masking generator 200 is provided with a masking memory unit 210.

In the masking memory unit 210 provided as described above, the individual measured frequency-by-frequency measurement is performed for each of the compartments in which the eavesdropping loudspeakers S11 through S66 for the divided compartments, which are installed together with the sound collecting units M11 through M66 for the divided compartments, Measured noise level information for prevention of eavesdropping by a divided section having a noise level is stored.

Accordingly, the noise masking generator 200 recognizes the eavesdropping loudspeakers (S11 ... S66) for each of the divided partitions indicated in the speaker search list information for the designated partition noise reduction, and detects the loudspeakers (S11 ... S66) are matched with the masking memory unit 210, and the frequencies of the measured noise level information for preventing the eavesdropping of the divided sections of the eavesdropping loudspeakers (S11 ... S66) So as to output a noise masking signal for preventing the eavesdropping by the magnitude of the respective sound pressure, and then controls the eavesdropping loudspeakers (S11 to S66) for each of the divided sections to be individually output.

The main reason why the noise masking generator 200 outputs the noise masking signal for preventing the eavesdropping which is different in the frequency characteristic and the sound pressure magnitude from each of the divided sections of the open space OP of the building is that the structure , A desk, a chair, an ornamental plant, etc.), the noise generation pattern is changed.

If the structure placed on each of the compartments is added or subtracted or the arrangement is changed, the measured noise level information for preventing the eavesdropping by each divided block is measured again in the corresponding compartment, and the measured noise level information for preventing the eavesdropping And a noise masking signal for preventing an eavesdropping sound having an optimal eavesdropping noise level at all times is output.

The noise masking signal generated by the noise masking generator 200 is a type of a noise masking signal for preventing eavesdropping. In the white noise or the audible frequency band in which the intensity of the frequency component is distributed uniformly in almost all frequency ranges, You can apply various noise such as pink noise (Pink Noise) that you have and separate input signal that you want.

In addition, 1/6 band or more equalization is built in each channel, and each channel is controlled by frequency.

Although not shown in the figure, an amplifier is provided between the noise masking generator 200 and the speaker for intercepting tapes S11 to S66 for each divisional section to amplify and output a noise masking signal for preventing an eavesdropping.

The central control unit 300 receives the noise information of each divided compartment from the noise collecting units M11 ... M66 of the divided compartments and transmits the noise information of the divided compartments to the noise collecting units M11 ... M66 of the corresponding divided compartments (S11 ... S66) for each of the divided subdivisions by searching for the eavesdropping loudspeakers (S11 ... S66) for each subdivision adjacent to the center of the divided subdivision, The sound masking generator 200 controls the noise masking generator 200 to transmit the sound signal to the noise masking generator 200. The noise masking generator 200 detects the sound signal of the sound signal from the speaker S11 ... S66 ) Are individually controlled so as to output a noise masking signal for preventing eavesdropping.

To this end, the central control unit 300 is provided with a central memory unit 310.

In this way, the open space OP of the building is displayed in the figure, the open space OP of the building shown in the figure is divided into the compartments, and the divided open space OP And a divided compartment wind part and speaker position information of a building open place where the positions of the sound collecting parts M11 ... M66 for the divided partitions and the speakers S11 ... S66 for the respective divided partitions are displayed are stored for each compartment.

The central control unit 300 controls the generation of the speaker search list information for the designated section noise by referring to the speaker position information of the divided compartment of the building open space and the speaker position information stored in the central memory unit 310 .

By using a device for preventing conversation eavesdropping applied to an open space of a building of the present invention having such a configuration, an acoustic soundproofing layer for a conversation occurrence area for preventing eavesdropping is formed around a specific compartment of an open space where noise is generated in a large open space of a building The process of building is as follows.

First, an open space (OP) in which an inner space is opened without a wall inside a building is divided into acoustic compartments, and noise collecting units (M11 ... M66) for each divided compartment installed in each divided compartment, The noise generated in the compartment is measured at predetermined intervals (S100).

If it is determined that there is no noise measured in the sound collecting units M11 ... M66 for each divided section S110, the noise collecting units M11 ... M66 of the corresponding divided compartments for which the noise is measured, If the noise information is larger than the unmanned reference noise information by comparing the noise information with the unmanned reference noise information of the compartments stored in the memory unit 130 according to the divided partition (S120), the noise collecting unit (M11 ... M66) performs the function of continuously measuring the noise generated in the corresponding section at predetermined intervals (S100).

On the other hand, when the noise information of each divided section is larger than that of the unmanned reference noise information, the noise collecting units (M11 ... M66) If it occurs more than the preset number of times, it is transmitted to the central control unit (S130).

The central control unit 300 then compares the noise information of each divided compartment with the sound information of the divided compartments of the building open space and the speaker position information stored in the central memory unit 310, (S11 ... S66) for each of the subdivisions by searching for the neighboring divided subdivisions (S11 ... S66) for each of the subdivision subdivisions, generates a subdivision sound-isolating speaker search list information for identifying the subdivision- And transmits it to the noise masking generator 200 (S140).

Thereafter, the noise masking generator 200 recognizes the eavesdropping loudspeakers (S11 ... S66) for the divided partitions indicated in the sent speaker search list information for noise reduction for the designated subdivision, ... S66) of the eavesdropping prevention speaker (S11 ... S66) for each of the divided sections, which are extracted by matching with the masking memory 210, And generates a noise masking signal for preventing an eavesdropping by a sound pressure level (S150).

Thereafter, the noise masking generator 200 generates the noise suppression signal for the eavesdropping intercepting speaker (S11 ... S66) for each of the divided subdivisions indicated in the speaker search list information for the specified subdivision noise- (S160) for each of the eavesdropping loudspeakers (S11 ... S66) for each of the divided sections corresponding to the noise masking signals for preventing the eavesdropping.

Thereafter, the eavesdropping loudspeakers (S11 ... S66) for each of the divided sections are outputted to the periphery of the noise collecting sections (M11 ... M66) for the divided sections, from which the transmitted noise masking signals for preventing eavesdropping are outputted and transmitted the noise information for each divided section The acoustic sound-proofing layer SP is formed (S170) so that the acoustic sound-proofing layer SP is formed only in the area where the conversation occurs, and the driving power cost Which can be advantageous.

The comparative determination unit 140 of each of the divided compartments of the noise collecting units M11 ... M66 of the divided compartments transmits the noise information of the divided compartments when the noise information of the divided compartments measured during the predetermined time is smaller than the unmanned reference noise information The central control unit 300 suspends transmission of the speaker search list information for the designated partition noise reduction to the noise masking generator 200 based on the interruption of the transmission of the noise information for each partition, The noise masking signal for preventing the eavesdropping is no longer generated, thereby controlling the eavesdropping function only when a conversation occurs, thereby reducing the driving power cost required for performing eavesdropping prevention.

110: Microphone according to dividing section 120:
130: Memory part for each divided part 140: Comparison part for each divided part
200: Noise masking generator 210: Memory for masking
300: central control unit 310: central memory unit
OP: Open place
SP: Acoustic sound insulation layer
M11 ... M66: Sound collector for each division
S11 ... S66: Speaker for intercepting by divisional partition

Claims (7)

(OP) in which an internal space is opened without a wall inside a building is divided into acoustical compartments, and each compartment is divided into a plurality of divided compartments. (M11 ... M66) for each of the divided compartments to transmit the noise information of the divided compartments measured in the compartment when it is determined that there is a person;
(S11 ... S66) for each of the divided compartments, each of which is provided for each of the sound collecting units (M11 ... M66) for each of the divided compartments;
A noise masking generator 200 for generating a noise masking signal for preventing the eavesdropping and outputting the generated noise masking signal through the eavesdropping loudspeakers S11 ... S66 for each of the divided sections, )Wow;
The open area OP of the building is represented by a figure and the open area OP of the building shown in the figure is divided into sections, and the perforations of the divided open spaces OP are divided into the sound collecting sections M11 ... M66), and a central memory unit (310) for storing the speaker position information of the divided section of the building open space where the positions of the loudspeakers (S11 ... S66) for dividing the divided sections are displayed;
M66, ..., M66, ..., M66, ..., M66, ..., M66, ..., M66, ..., M66, ..., M66, M66, M66, M63, M63, M63, M63, M63, M63, M63, M63, M63, M63, M63, A central control unit (not shown) for generating speaker search list information for designating a specific partition for noise suppression indicating the eavesdropping loudspeakers (S11 ... S66) for each divided section extracted by the search, and transmitting the generated search list information to the noise masking generator 200 300), so that the noise masking generator (200) can prevent the speaker from interfering with each of the divided compartments (S11 ... S66) to output a noise masking signal for preventing the eavesdropping, and a dialog for preventing the eavesdropping is generated along the periphery of the noise collecting units M11 ... M66 of the divided compartments Wherein the acoustic acoustic insulation layer (SP) is constructed according to an installation position of the noise collecting parts (M11 ... M66) of the divided compartments transmitting the noise information of the divided compartments, (SP) of the building is variable.
The method according to claim 1,
The noise collectors M11 ... M66 of the divided sections are,
A microcomputer 110 for dividing the microcomputer into a noise generated in the compartment;
A speech segment converting section 120 for generating noise information (unit: dBA) according to the divided segment, which is information indicating the magnitude of noise generated in the corresponding segment inputted through the microphones 110 according to the segment segment;
A memory unit 130 for each divided section in which unmanned reference noise information (unit: dBA) for each of the compartments, which is the magnitude of the noise measured when there is no person in the compartment, is stored;
Comparing the unmanned reference noise information of the divided partition memory unit 130 with the noise information of the divided partition generated by the speech converting unit 120 of each divided block to determine that the noise information per divided partition is larger than the unmanned reference noise information (140) for determining that there is a person and controlling the noise to be transmitted to the central control unit (300) based on the measured noise level of the divided zone in the corresponding zone Applied conversation eavesdropping device.
delete The method according to claim 1,
The noise masking generator 200 includes a masking memory 210,
The masking memory unit 210 is provided with a noise measuring unit for measuring a frequency of each measured frequency for each of the compartments in which the loudspeaker interception loudspeakers S11 ... S66 for each of the divided compartments installed along with the sound collecting units M11 ... M66 for the divided compartments are located, The measured noise level information for preventing the eavesdropping of each divided segment having the level is stored,
The noise masking generator 200 recognizes the eavesdropping loudspeakers S11 ... S66 according to the divided partitions indicated in the speaker search list information for blocking the noise in the designated section, Of the measured noise level information for preventing the eavesdropping of each of the divided sections of the eavesdropping loudspeakers S11 ... S66 according to the divided partitions, which are extracted by matching with the masking memory unit 210, (S11 ... S66) for each of the divided subdivisions is output after the generation of the noise masking signal for preventing the eavesdropping by the magnitude of the sound pressure per frequency, Devices for preventing eavesdropping.
(OP) in which the interior space is opened without a wall in the inside of the building is divided into sections, and noise is generated in the sound collecting sections (M11 ... M66) for each divided section installed in each divided partitioning place Measuring (S100) every set period;
A step (S110) of checking whether there is noise measured at the sound collecting parts (M11 ... M66) of the divided partitions;
If the measured noise is present, the measured noises of the divided zones according to the divided zones and the noise information of the divided zones are measured by the noise collecting units M11 ... M66 of the respective divided zones, (S120) checking whether the noise information of each divided section is larger than the unmanned reference noise information in comparison with the unmanned reference noise information of each of the divided sections;
If the noise information for each divided section is larger than the unmanned reference noise information, the generated noise information for each divided section (M11 ... M66) is transmitted to the central control unit (S130);
The center control unit receives the noise information for each divided section and matches the transmitted noise information for each divided section with the speaker section position information and speaker position information of the open space of the building stored in the central memory unit 310, (S11 ... S66) for each of the neighboring divided sections around the noise collecting sections (M11 ... M66) for the respective divided sections to which the noise information for each section has been transmitted, and extracts the divided sections (S140) of generating a noise suppression search list information for a designated partition for displaying separate eavesdropping shielding speakers (S11 ... S66) and transmitting it to the noise masking generator (200);
The noise masking generator 200 recognizes the eavesdropping loudspeakers S11 through S66 of the divided partitions indicated in the sentence search list information for blocking the noise transmitted to the designated section, ... S66) to be detected by matching with the measured noise level information for preventing the eavesdropping by each divided block Speaker for the noise suppression Test noises for preventing eavesdropping by the divided sections of the eavesdropping speakers (S11 ... S66) Generating (S150) noise-masking signals for preventing eavesdropping adjusted by the frequency magnitude of the level information;
The noise masking generator 200 adjusts the frequency of the measured noise level for preventing the eavesdropping of each of the divided sections of the eavesdropping loudspeakers S11 ... S66 for each of the divided sections indicated by the speaker search list information for the designated section noise- A step (S160) of individually transmitting noise masking signals for preventing eavesdropping to the respective eavesdropping speakers S11 ... S66 for each of the divided sections corresponding to the noise masking signals for preventing the eavesdropping;
The noise masking signals for preventing the respective eavesdroppers transmitted from the eavesdropping loudspeakers (S11 ... S66) for each of the divided partitions are outputted to the noise collectors (M11 ... M66) (S170) constructing an acoustic sound-proofing layer (SP) in which a conversation occurrence area for preventing eavesdropping is formed along a circumference (perimeter) section (S170).
6. The method of claim 5,
If the noise information for each divided section is larger than the unmanned reference noise information, the generated noise information for each divided section (M11 ... M66) is transmitted to the central control unit In this step,
Wherein the noise collection unit for each divided block is controlled to transmit the repeated noise information for each divided block generated to the central control unit only when the noise information for each divided block is generated for a predetermined number of times or more than the predetermined number of times The method comprising the steps of:
6. The method of claim 5,
The noise masking generator 200 is provided with a sound level measuring unit for measuring sound levels of individual measured frequencies for each of the compartments in which the loudspeaker interception loudspeakers S11 ... S66 for each of the divided compartments installed with the sound collecting units M11 ... M66 for the divided compartments are located, And a masking memory unit 210 for storing measured noise level information for preventing an eavesdropping by each divided section,
If the structure installed in the compartment of the corresponding open area (OP) in which the loudspeakers (S11 ... S66) for intercepting the divided partitions are installed is installed or changed in arrangement, the measured noise level information for preventing the eavesdropping for each divided compartment is re- And the measured noise level information for preventing the eavesdropping by the divided partitions, which are measured again, is updated and stored in the masking memory unit (210).

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