KR102228781B1 - Method for monitoring security by using sound field information - Google Patents

Abstract

The present invention provides a security monitoring method using sound field information. The method comprises the steps of: alternately outputting sound waves into a security monitoring space by a plurality of sound generators; acquiring sound field information from the sound waves received in the security monitoring space by an a sound receiver; and analyzing the acquired sound field information to determine whether a security alert situation has occurred by a central processing unit.

Description

Security monitoring method using sound field information {METHOD FOR MONITORING SECURITY BY USING SOUND FIELD INFORMATION}

The present invention relates to security monitoring, and to a technology for detecting whether a dangerous situation occurs based on a change in a sound field.

Currently, various security sensors are used to detect intrusion, fire, gas leakage, etc. in an indoor space. As a sensor that detects intrusion, a passive infrared sensor (PIR) sensor, an IR sensor, an ultrasonic sensor, a sound sensor, a vibration sensor, and a microwave sensor are used. As a sensor that detects fire, a temperature sensor, Smoke detection sensors, gas detection sensors, and flame detection sensors are widely used.

However, since the above-described sensors are specialized for detecting any one of intrusion, fire, and gas leakage, in order to detect all situations, all sensors specialized for the situation must be installed in the indoor space. There is a problem.

As an alternative to solve this problem, a sound field security sensor has recently emerged that can detect all situations such as intrusion, fire, gas leakage, etc. by analyzing a change pattern of the sound field.

The sound field security sensor is basically configured to include a sound generating device, a sound receiving device, and a sound field signal processing device. The sound generating device outputs (or radiates) sound waves of one frequency (for example, 1000 Hz) or a set (for example, 1000, 1001, 1002, 1003, 1004 ?????? 1010 Hz) having a plurality of adjacent frequencies. At this time, a set of frequencies may be radiated sequentially in a time order, or each frequency may be radiated simultaneously by forming a chord. When sound waves are emitted in the security monitoring space, a specific sound field is formed for each frequency. The sound receiving device measures the sound field by frequency at a given location, and the sound field signal processing device detects all situations such as intrusion, fire, gas leakage, etc. It can be detected and distinguished.

In an actual sound field security sensor, rather than using a fixed frequency such as 1000 Hz, for example, 1000, 1001, 1002, 1003, 1004?????? It is more common to use a set of frequencies of adjacent frequencies, such as 1010 Hz. Therefore, hereinafter, for convenience, the above two cases are not distinguished, and both cases are expressed as 1000Hz sound waves.

However, in the existing sound field security sensor, it is common to install a plurality of sound generating devices in order to reduce the blind spot. At this time, since the plurality of sound generating devices output sound waves having the same frequency at the same time, interference between sound waves occurs, which interferes with accurate analysis of sound field changes (or sound field change patterns). As a result, when a plurality of sound generating devices are used, there is an advantage in that blind spots are reduced, while a problem in that detection performance is deteriorated may occur.

As the simplest example, assume that two speakers are arranged with their backs facing each other in opposite directions, and the same input signal is input to both speakers. Since the soundwave of the speaker vibrates in one direction, sound waves are radiated forward, but inevitably radiate backward. Therefore, sound waves radiated from one speaker to the rear are radiated into the same space as the sound waves radiated to the front from the speaker facing the opposite direction and interfere with each other. However, since the voltage of the same phase is input to the two speakers, the sound waves emitted from one speaker to the front and the sound waves emitted from the speaker facing the opposite direction are 180 degrees out of phase, so the two sound waves cancel each other out. do.

Such negative interference effects occur in various ways when a plurality of speakers are arranged. For example, when three speakers are facing each other at 120 degrees, each facing 12 o'clock, 4 o'clock, and 8 o'clock, and when the same input voltage is applied to each speaker, sound waves radiated to the front of the speaker at 12 o'clock. The sound waves radiated to the rear of the speaker at 4 o'clock and 8 o'clock and cause destructive interference with each other.

The present invention is invented to solve the above problems, and by suppressing interference between sound waves as sound waves having the same frequency are simultaneously output by sound waves installed at a plurality of locations at the same time, the sound field change (or sound field It is to provide a security monitoring method that can increase the reliability of security detection using sound field changes by enabling accurate analysis of change patterns).

The above-described objects, other objects, advantages, and features of the present invention, and methods of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings.

A security monitoring method using a sound field change according to an aspect of the present invention includes: outputting sound waves alternately by a plurality of sound generators into a security monitoring space, and obtaining sound field information from sound waves received in the security monitoring space by an acoustic receiver And determining, by the central processing unit, whether a security alert condition has occurred by analyzing the acquired sound field information.

A security monitoring method using sound field changes according to another aspect of the present invention includes the steps of simultaneously outputting sound waves having different output frequencies by a plurality of sound generators into a security monitoring space, and sound waves received in the security monitoring space by an acoustic receiver Obtaining sound field information from and by the central processing unit analyzes the acquired sound field information to determine whether a security alert condition has occurred.

In the security monitoring method using sound field changes according to the present invention, interference between sound waves output from a plurality of sound devices is suppressed by adjusting at least one of output timing and output frequency of a plurality of sound generating devices, and at the same time, a monitoring range (monitoring area ), it is possible to accurately analyze changes in the sound field, thereby increasing the reliability of security detection.

1 is a block diagram illustrating an exemplary security monitoring device of the present invention.
2 is a diagram illustrating an arrangement structure of the sound generators shown in FIG. 1 by way of example.
3 to 6 are views schematically showing sound wave output methods of a plurality of sound generators according to various embodiments of the present disclosure.
7 is a flowchart illustrating a security monitoring method of the present invention by way of example.

The aspect in which the present invention is implemented will be described with reference to each of the following preferred embodiments. It is apparent that the present invention is not limited to the embodiments disclosed below, but can be implemented in other various forms within the scope of the technical idea of the present invention. The terms used in the present specification are also intended to describe embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprise" and/or "comprising" refers to the presence of one or more other components, steps, actions and/or elements in which the referenced component, step, action and/or element is Or does not preclude additions.

1 is a diagram illustrating a security monitoring device according to an embodiment of the present invention.

Referring to FIG. 1, the security monitoring device 100 includes a sound generator 110, a sound receiver 120, and a sound field signal processor 130, and these components 110, 120, 130 are one housing It is built in and manufactured as an integral type.

The sound generator 110 is configured to output sound waves (or sound signals) according to the control of the sound field signal processor 130, and in the present embodiment, it is assumed to include three sound generators 111, 113, and 115. Although described, it is not limited thereto, and may be configured to include four or more sound generators according to design. As described above, since the first to third sound generators 111, 113, and 115 are built in one housing, it is possible to avoid the hassle of having to be installed at a plurality of locations within a security monitoring space as in the prior art.

The first to third sound generators 111, 113, and 115 generate respective sound waves (or sound signals) and output them to the inside of the security monitoring space. For example, the first to third sound generators 111, 113, and 115 may be implemented as speakers or the like.

The first to third sound generators 111, 113, and 115 output sound waves in different directions to minimize blind spots when outputting respective sound waves into the security monitoring space. For example, as shown in FIG. 2, the first to third sound generators 111, 113, and 115 are installed at 120° intervals within the housing 20, and the first sound generator 111 is a first sound generator. The sound wave is output in an output range including the direction D1, and the second sound generator 113 generates the sound wave in an output range including the second direction D2 having an interval of 120 degrees with respect to the first direction D1. Then, the third sound generator 115 outputs sound waves in an output range including the third direction D3 having an interval of 120 degrees with respect to the second direction D2. Here, when the sound generator is assumed to be a speaker, the first to third directions D1, D2, and D3 may be defined as a direction perpendicular to the plane, assuming that the front surface of the sound wave output from the speaker is a plane. .

As described above, since the first to third sound generators 111, 113, and 115 output their sound waves into the security monitoring space at 120° intervals, sound waves can be output in all directions without a blind spot within the security monitoring space.

In addition, as will be described in detail below, the first to third sound generators 111, 113 and 115 remove interference between sound waves by adjusting at least one of the output timing and output frequency of sound waves, and expand the monitoring target to monitor. It can greatly improve performance.

The sound receiver 120 receives sound waves detected inside the security monitoring space, and outputs the received sound waves to the sound field signal processor 130. For example, the sound receiver 320 may be implemented with a microphone or the like.

The sound field signal processor 130 includes an output frequency, output timing, sound pressure, sound reception operation of the sound receiver 120, and a plurality of sound generators 110 of sound waves output from the plurality of sound generators 111, 113, and 115. Controls the synchronization of the sound receiver 120.

The sound field signal processor 130 acquires one or more sound field information (for example, sound pressure or phase, etc.) through sound waves received through the sound receiver 120, and detects a security alarm situation by comparing the acquired sound field information with the reference sound field information. do. The sound field signal processor 130 outputs a security alarm signal when a security alarm situation occurs.

Hereinafter, the sound field signal processor 130 will be described in detail.

The sound field signal processor 130, as shown in FIG. 1, includes a frequency setting unit 131, an output timing setting unit 132, an acoustic signal receiving unit 133, a central processing unit 134, a memory 135, and It includes a user interface 136 and an alarm generator 137.

The frequency setting unit 131 sets the sound pressure and output frequency (or output wavelength) of sound waves generated from the first to third sound generators 111, 113 and 115, respectively, according to the control of the central processing unit 134 do. Sound waves for which sound pressure and output frequency are set are output through the corresponding sound generator.

For example, the first to third sound generators 111, 113, and 115 may be set to output sound waves having the same output frequency fc (or a set of frequencies) at different times.

As another example, the first to third sound generators 111, 113, and 115 may be set to output sound waves having different output frequencies (or frequency sets). For example, the first sound generator 111 outputs a sound wave having a first output frequency (or frequency set), and the second sound generator 113 is a second output frequency (set) different from the first output frequency (set) The third sound generator 115 may be set to output a sound wave having a third output frequency (or a set of frequencies) different from the first and second output frequencies (sets).

In this case, the frequency set forming the first output frequency is a frequency set within 1 KHz (for example, 996, 997, 998, 999, 1000, 1001, 1002, 1003, 1004 Hz), and the frequency set forming the second output frequency Is a frequency set within 4KHz (e.g., 3996, 3997, 3998, 3999, 4000, 4001, 4002, 4003, 4004 Hz), and the frequency set forming the third output frequency is a frequency set within 8 KHz (e.g., 7996 , 7997, 7998, 7999, 8000, 8001, 8002, 8003, 8004 Hz).

If the output frequency of the sound wave output from each sound generator is set differently, the monitoring performance can be improved. In the case of using high-frequency sound waves, in an open space without a structure, the detection of a security situation can be made more precise. On the other hand, the higher the frequency, the stronger the straightness and less diffraction of the sound wave, making it difficult to detect a security situation occurring behind an obstacle, resulting in a reduced detection range.

Accordingly, as in the present invention, if a plurality of sound generators are set to output sound waves (or frequency sets) having different frequencies, both detection accuracy and detection range can be satisfied within the security monitoring space.

The output timing setting unit 132 sets output timings (or output periods) of sound waves generated from the first to third sound generators 111, 113, and 115, respectively, according to the control of the central processing unit 134, and , Sound waves are output through the sound generator according to the set output timing.

For example, the first to third sound generators 111, 113, and 115 may be set to output sound waves alternately. For example, after the first sound generator 111 outputs a sound wave, the second sound generator 113 outputs the sound wave, and then the third sound generator 115 outputs the sound wave. have.

The output timing of the sound wave and the setting of the output frequency (or frequency set) may be determined according to a user input input through the user interface 136. For example, the central processing unit 134 receives user input information including output timing information of each sound wave desired by the user and frequency information of each sound wave from the user interface 136, and in response thereto, the frequency setting unit 131 ) And the sound wave output timing setting unit 132 to control the sound wave output timing and output frequency.

The sound signal receiver 133 processes sound waves collected through the sound receiver 120 and outputs the signal to the central processing unit 134.

The central processing unit 134 may be implemented as a general-purpose microprocessor, controls the frequency setting unit 131 and the output timing setting unit 132, and uses a signal received through the sound signal receiving unit 133 to provide a security alert. You can detect the situation.

The central processing unit 134 acquires sound field information through sound waves collected through the sound receiver 120. At this time, if the output timing is set so that the sound generators 111, 113, and 115 sequentially output sound waves, if the respective output directions of the sound generators 111, 113, and 115 are known, the location along with the sound field information Information can be obtained.

For example, in the process of installing the security monitoring device 100 at a specific location (ceiling) in the security monitoring space, the first sound generator 111 is located in the monitoring area in the first direction (D1) in the security monitoring space ( For example, it covers the main room, and the second sound generator 113 covers the surveillance area (eg, kitchen) in the second direction D2 side in the security monitoring space, and the third sound generator 115 ) Is installed to cover the surveillance area (eg, living room) in the third direction (D3), and then the user inputs the surveillance area for each sound generator as location information through the user interface 136 in advance, Since the sound generators sequentially output sound waves in a state in which the output timing of the sound generators and the reception timing of the sound receiver are synchronized, the sound receiver 120 can identify the sound generator that outputs the sound wave received at the current time point. Based on the location information input to, location information on a surveillance area monitored by the identified sound generator may be obtained.

The central processing unit 134 detects a security alarm situation (intrusion, fire, or gas leak) for a specific area within the security monitoring space by comparing the preset reference sound field information with the currently measured sound field information.

The central processing unit 134 generates a security alarm situation according to a result of detecting the security alarm situation, outputs a notification message notifying the occurrence of the security alarm situation to the alarm generation unit 137, and the alarm generation unit 137 In response to the notification message, a security alarm signal is output.

Meanwhile, the preset reference sound field information need not always be a fixed value, and for example, the reference sound field may be re-established according to a predetermined time interval. For example, because the temperature of a security surveillance room can change over time at night and during the day, it can be programmed to set a new reference sound field to match the changed temperature.

In addition, in this embodiment, in order to detect a security alarm situation, a simple comparison method for comparing preset reference sound field information and currently measured sound field information is described as an example, but the present invention is not limited thereto, and the sound field related to the security alarm situation It is also possible to detect a security alarm situation from currently measured sound field information based on a learning model built by learning a change pattern in advance (machine learning).

As described above, the overall contents of the security monitoring device 100 according to the embodiment of the present invention have been described in detail, but the technical core of the present invention lies in the sound wave output method of sound generators provided to output sound waves in all directions, and hereinafter, sound Various embodiments of the sound wave output method of the generators will be described with reference to the drawings.

Example 1

3 is a view for explaining a sound wave output method of a plurality of sound generators according to the first embodiment of the present invention.

Referring to FIG. 3, in the first embodiment, a plurality of sound generators 111, 113, and 115 alternately output sound waves having the same output frequency (or frequency set).

For example, as shown in FIG. 3, the first sound generator 111 outputs a sound wave having an output frequency fc at a first time t1, and the second sound generator 113 A sound wave having an output frequency (fc) is output at a second time (t2) consecutive to, and the third sound generator (115) outputs an output frequency (fc) at a third time (t3) consecutive to the second time (t2). Outputs a sound wave with ).

In the case of Example 1, since the plurality of sound generators 111, 113, and 115 alternately output sound waves having the same output frequency fc, interference with sound waves output from other sound generators can be fundamentally blocked. I can.

Example 2

4 is a diagram illustrating a sound wave output method of a plurality of sound generators according to a second embodiment of the present invention.

Referring to FIG. 4, in Embodiment 2, a plurality of sound generators 111, 113 and 115 simultaneously output sound waves having different output frequencies (or frequency sets), but the output frequency of sound waves output by each sound generator Is a fixed method over time.

For example, as shown in FIG. 4, a plurality of sound generators 111, 113, and 115 simultaneously output sound waves, but the first sound generator 111 has a first frequency (or frequency set) (f1) The second sound generator 113 fixedly outputs a sound wave having a second frequency (or frequency set) f2 different from the first frequency f1, and a third sound generator ( 115) is a fixed output of sound waves having a third frequency (or frequency set) f3 different from the first and second frequencies f1 and f2.

In the case of the second embodiment, since each sound generator emits sound waves at the same time, mutual interference occurs, but since the radiating frequencies are different from each other, the same result as without mutual interference can be obtained through filtering.

In addition, in the case of the second embodiment, both the detection precision and the detection range can be satisfied by using different frequencies (or frequency sets).

Example 3

5 is a diagram illustrating a sound wave output method of a plurality of sound generators according to a third embodiment of the present invention.

Referring to FIG. 5, in Embodiment 3, a plurality of sound generators 111, 113 and 115 simultaneously output sound waves having different output frequencies, but the output frequency of the sound waves output by each sound generator is It is changed and does not overlap with the output frequency of sound waves output from other sound generators.

For example, as shown in FIG. 5, at a first time t1, the first to third sound generators are sound waves having a first frequency f1 (or frequency set), a second frequency f2 (or A sound wave having a frequency set) and a sound wave having a third frequency f3 (or a frequency set) are simultaneously output, and at the second time t2, the first to third sound generators have a second frequency f2. A sound wave, a sound wave having a third frequency (f3), and a sound wave having a first frequency (f1) are simultaneously output, and at the third time (t3), the first to third sound generators have a third frequency (f3). A sound wave, a sound wave having a first frequency f1, and a sound wave having a second frequency f2 are simultaneously output.

In the case of Example 3, all the effects that can be obtained through Example 1 and Example 2 are provided.

Example 4

6 is a diagram illustrating a sound wave output method of a plurality of sound generators according to a fourth embodiment of the present invention.

Referring to FIG. 6, Embodiment 4 is a method in which a plurality of sound generators 111, 113 and 115 alternately output sound waves having different output frequencies, and a combination of Embodiments 1, 2, and 3 to be.

For example, as shown in FIG. 6, when the output frequency of sound waves set in each sound generator is set as the first to third output frequencies, and the output order is set in the order of the first to third sound generators, the first When the sound generator outputs a sound wave having a first frequency, then, the second sound generator outputs a sound wave having a second frequency, and thereafter, when the third sound generator outputs a sound wave having a third frequency, the first cycle (Cycle 1) is completed.

In the second cycle (Cycle 2), the first sound generator does not output the sound wave having the first frequency output in the first cycle, but outputs the sound wave having the second output frequency. Thereafter, the second sound generator outputs a sound wave. Likewise, instead of outputting a sound wave having a second output frequency output in the first cycle, it outputs a sound wave having a third output frequency, and similarly, the third sound generator is also the first. Instead of outputting a sound wave having a third output frequency output in the cycle, a sound wave having a first output frequency is output.

In the third cycle, in a similar manner, each sound generator alternately outputs a sound wave, but each sound generator outputs a sound wave having an output frequency that was not output in Cycle 1 and Cycle 2.

That is, in Example 5, a plurality of sound generators 111, 113 and 115 alternately output sound waves having different output frequencies, but each sound generator sequentially outputs sound waves for each output frequency within a set output frequency range. It is to do.

As described above, since Embodiment 4 is a method in which Embodiments 1, 2, and 3 are combined, all the effects of Embodiments 1, 2, and 3 can be provided.

7 is a flowchart illustrating an exemplary security monitoring method according to the present invention.

Referring to FIG. 7, in step S710, the central processing unit 134 controls the frequency setting unit 131 and the output timing setting unit 132 according to a user input input through a user interface to generate a plurality of sound generators. At least one of an output timing and an output frequency of the sound wave output from 110 is set.

Subsequently, in step S720, the plurality of sound generators output the sound waves into the security monitoring space according to the setting.

For example, a plurality of sound generators may alternately output sound waves into the security monitoring space according to the setting. At this time, the plurality of sound generators alternately output sound waves having the same output frequency as shown in FIG. 3 or the plurality of sound generators alternately output sound waves having different output frequencies as shown in FIG. 6. can do.

As another example, a plurality of sound generators may simultaneously output sound waves having different output frequencies into the security monitoring space according to the setting. At this time, the output frequency of the sound waves output by each of the plurality of sound generators is fixed over time, or the output frequency of the sound waves output by each sound generator is changed over time, and the output frequency of the sound waves output from other sound generators It can be output so that it does not overlap with.

Subsequently, in step S730, the sound receiver acquires sound field information from sound waves received in the security monitoring space.

Subsequently, in step S740, the central processing unit compares the reference sound field information and the acquired sound field information to determine whether a security alert condition has occurred.

The security monitoring method according to the present invention can be applied to security cameras such as CCTV or car black box, and various smart home appliances including internet phones, smart phones, smart TVs, smart cars, interphones, AI speakers, etc., and intelligent safes. It can be applied to a device or equipment and used.

Meanwhile, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, it should be determined not only by the claims but also by the claims and equivalents of this invention.

Claims (5)

A plurality of sound generators installed to output sound waves in different directions alternately output sound waves having different output frequencies every cycle, but each sound generator currently produces sound waves having an output frequency different from the output frequency output in the previous cycle. Outputting into the security monitoring space in the cycle;
Obtaining, by an acoustic receiver, sound field information from sound waves received in the security monitoring space; And
A step in which the central processing unit analyzes the acquired sound field information to determine whether or not a security alert condition has occurred.
Security monitoring method using sound field information comprising a. In claim 1,
The outputting step,
Outputting the sound waves in different directions by the plurality of sound generators integrally manufactured in one device
Security monitoring method using sound field information. In claim 1,
The plurality of sound generators include a first sound generator and a second sound generator,
The outputting step,
Outputting, by the second sound generator, a sound wave having a second frequency after the first sound generator outputs a sound wave having a first frequency in a previous cycle; And
In the current cycle, after the first sound generator outputs a sound wave having the second frequency, the second sound generator outputs a sound wave having the first frequency, and security monitoring using sound field information Way. delete In claim 1,
The outputting step,
Outputting that the output frequency of sound waves output from each sound generator is changed over time and does not overlap with the output frequency of sound waves output from other sound generators.
Security monitoring method using sound field information.

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