KR20150023139A - apparatus for measuring noise - Google Patents

apparatus for measuring noise Download PDF

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Publication number
KR20150023139A
KR20150023139A KR20130100206A KR20130100206A KR20150023139A KR 20150023139 A KR20150023139 A KR 20150023139A KR 20130100206 A KR20130100206 A KR 20130100206A KR 20130100206 A KR20130100206 A KR 20130100206A KR 20150023139 A KR20150023139 A KR 20150023139A
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KR
South Korea
Prior art keywords
microphone
signal
noise
sound source
sensor unit
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Application number
KR20130100206A
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Korean (ko)
Inventor
이장명
Original Assignee
주식회사 싸이언
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Publication date
Application filed by 주식회사 싸이언 filed Critical 주식회사 싸이언
Priority to KR20130100206A priority Critical patent/KR20150023139A/en
Publication of KR20150023139A publication Critical patent/KR20150023139A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H15/00—Measuring mechanical or acoustic impedance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics

Abstract

Disclosed is a noise measuring apparatus comprising an audio sensor unit including a first microphone and a second microphone which are aligned and receiving a mixed audio signal; a signal converting unit converting the audio signal input to the audio sensor unit into a digital signal; and a data processing unit including a directivity detecting unit detecting a first directional noise signal in which directivity is stressed in a target sound source direction with respect to the mixed audio signal and a second directional noise signal in which directivity is suppressed in the target sound source direction, and masking an interference sound source included in the first directional noise on the basis of a ratio of the first directional noise signal and the second directional noise signal to extract target noise from the first directional noise.

Description

An apparatus for measuring noise

The present invention relates to a noise measurement apparatus capable of distinguishing object noise from ambient noise.

The noise that is frequently encountered in everyday life leads to the inconvenience of life and it becomes the main cause of complaints. Therefore, it is necessary to measure and evaluate the noise level of the area where the noise is generated. Usually, the noise level of the place where the problem is caused is measured by using the portable silencer. However, it is necessary to constantly monitor the noise level of a specific area as needed, and the noise monitoring system is used at this time. The noise monitoring system is widely used not only for environmental noise but also for monitoring aircraft noise around the airport.

In recent noise monitoring systems, the noise level of the measurement site is transmitted to the public in real time using a network such as the Internet. Currently, the noise monitoring system using the network is widely used in Korea and abroad, but there are many problems to be supplemented.

For example, when monitoring the noise level of a specific area such as a construction site, ambient noise is measured in the same way. That is, only the noise level of the construction site should be measured, but it is measured as the total noise level including the road traffic noise or other noise inducing factors around the construction site. In this case, it is necessary to separately measure the target noise of a specific area such as the noise level of the construction site, and to separate the noise from the entire surrounding noise to display the noise level.

An embodiment of the present invention provides a noise measurement device capable of clearly separating a specific object noise from ambient noise including a plurality of sounds input through a microphone array.

An apparatus for measuring noise according to an embodiment of the present invention includes an acoustic sensor unit including a first microphone and a second microphone arranged in a straight line and receiving mixed acoustic signals; A signal converter for converting the acoustic signal inputted to the acoustic sensor unit into a digital signal; And a directivity detector for detecting a first direction noise signal in which directionality is emphasized in the direction of the target sound source and a second direction noise signal in which the directivity is suppressed in the direction of the target sound source for the mixed sound signal, And a data processor for extracting an object noise from the first directional noise by masking an interference sound source included in the first directional noise based on a ratio between the second directional noise signals.

According to another aspect of the present invention, there is provided a noise measuring apparatus comprising: an acoustic sensor unit including a first microphone, a second microphone and a third microphone sequentially arranged in a straight line, the acoustic sensor unit receiving a mixed acoustic signal; A signal converter for converting the acoustic signal inputted to the acoustic sensor unit into a digital signal; And a directivity detector for generating a first direction noise signal in which directionality is emphasized in the direction of the target sound source and a second direction noise signal in which the directivity is suppressed in the direction of the target sound source for the mixed sound signal, And a second direction noise signal generating unit for generating a first direction noise signal by masking an interference sound source signal included in the first direction noise signal based on a ratio between the first direction noise signal and the second direction noise signal, And a frequency detector for detecting the frequency of the received signal.

According to the present invention, a specific object noise can be clearly separated from ambient noise including a plurality of sounds input through a plurality of microphone arrays.

1 is a block diagram illustrating an apparatus for measuring noise according to an embodiment of the present invention;
FIG. 2 is a schematic view illustrating an example of noise measurement using the noise measurement apparatus according to FIG. 1;
FIG. 3 is an enlarged view showing the noise measuring device according to FIG. 2 in detail.
FIG. 4 is a view showing a directional sound among the noise measured by the noise measurement device according to FIG. 1; FIG.
5 is a block diagram illustrating an apparatus for measuring noise according to another embodiment of the present invention.
FIG. 6 is a schematic view for explaining an example of noise measurement using the noise measurement apparatus according to FIG. 5;

Hereinafter, an embodiment of a noise measurement apparatus according to the present invention will be described with reference to the accompanying drawings.

1 to 4 illustrate an apparatus for measuring noise according to an embodiment of the present invention.

As shown in the figure, the noise measurement apparatus according to the present embodiment includes a sound sensor unit 10, a signal conversion unit 20, a data processing unit 30, and a display unit 40.

The sound sensor unit 10 acquires sound source signals emitted from a plurality of sound sources located in the surroundings in the form of a mixed sound. In the present embodiment, the acoustic sensor unit 10 includes a first microphone 11 and a second microphone 12. The respective microphones are arranged in a line in the body 10a to be protected from an external impact, And is once exposed to the outside of the body 10a.

Since the acoustic sensor unit 10 of the present embodiment includes two microphones, the time at which a plurality of sound source signals arrive at the respective microphones may vary depending on the positions and distances of corresponding sound sources.

For example, the acoustic sensor unit including two or more microphones may improve the amplitude by giving an appropriate weight to each signal received by the sound sensor unit to receive the target signal mixed with the background noise with a high sensitivity, It plays a role of a filter that can spatially reduce ambient noise when the directions are different. In this embodiment, this sound filter method is applied. Thus, the background noise can be reduced by improving the directionality from the noise by using the acoustic sensor unit.

The signal converting unit 20 amplifies the noise signal from the microphone, converts the amplified noise signal into a digital signal, and outputs the digital signal.

The data processing unit 30 detects only the target noise from ambient noise using the converted data from the signal converting unit 20. [ For example, the data processing unit 30 may include a directionality detecting unit 31 for detecting a first direction noise including the target noise and a second direction noise including other peripheral noises.

That is, the directivity detecting unit 31 generates a first direction noise signal whose direction is emphasized in the direction of the target sound source and a second direction noise signal whose direction is suppressed in the direction of the target sound source with respect to the mixed noise signal, The target sound source signal can be extracted from the first direction noise signal by masking the interference sound source signal included in the first direction noise signal based on the ratio between the two direction noise signals.

The display unit 40 outputs a noise data analysis result to allow a manager to visually confirm the noise data.

This will be described in more detail as follows.

The sound sensor unit 10 uses a microphone to detect only noise from the noise sources S1, S2, and S3 without background noise. The acoustic sensor unit 10 is disposed according to at least one of the size of the noise source, the distance between the noise source and the acoustic sensor, and the frequency band of the noise generated in the noise source. The number of acoustic sensors to be used may be varied according to at least one of the size of the noise source, the distance between the noise source and the microphone, and the frequency band of the noise generated in the noise source.

In this embodiment, the sound sensor unit 10 includes a first microphone 11 and a second microphone 12 arranged in a straight line with reference to FIG. Each microphone can have a sound-sensing angle of 120 °. Accordingly, when the positions of the first microphone 11 and the second microphone 12 are aligned according to the target object for measuring noise, the first direction noise from the first microphone toward the second microphone and the first direction noise from the second microphone You can measure the second direction noise toward the microphone.

That is, the acoustic sensor unit 10 can combine a plurality of microphones to obtain an additional property related to the directivity such as a direction or a position of a sound to be acquired as well as the sound itself. The directivity means that the sensitivity of a sound source signal emitted from a sound source located in a specific direction is increased by using a time difference in which the sound source signal reaches each of a plurality of microphones constituting the array. Accordingly, by acquiring the sound source signals using the sound sensor unit 10, the data processing unit 30 can emphasize or suppress the sound source signals inputted from a specific direction.

For example, referring to FIGS. 3 and 4, after the first microphone 11 is disposed so as to be close to the target object, the time at which the target noise from the target object reaches the first microphone 11, The data processing unit 30 can measure the noise level of the first directional noise by detecting the time when the first directional noise reaches the second directional sensor 12. The noise level of the second direction noise can be detected in the same manner and the second direction noise can be excluded in order to measure only the target noise level generated from the target object. As described above, the object noise and the ambient noise are displayed on the display unit 40 so that the manager can take appropriate measures thereafter.

5 and 6 illustrate an apparatus for measuring noise according to another embodiment of the present invention.

As shown in the figure, the noise measurement apparatus according to the present embodiment includes a sound sensor unit 10, a signal conversion unit 20, a data processing unit 30, and a display unit 40.

The acoustic sensor unit 10 of the present embodiment includes three microphones 11, 12, and 13. That is, the acoustic sensor unit 10 includes a first microphone 11, a second microphone 12, and a third microphone 13 arranged in a straight line. Each microphone can have a sound-sensing angle of 120 °. Accordingly, the first direction noise and the second direction noise can be measured using two microphones among the three microphones according to the target object for measuring the noise. For example, when the positions of the first microphone 11 and the second microphone 12 are aligned, a first direction noise from the first microphone toward the second microphone and a second direction noise from the second microphone toward the first microphone are measured can do. That is, in this embodiment, as in the first embodiment, directional sounds can be distinguished by using two of three microphones. Since this process is described in the first embodiment, a detailed description will be omitted.

On the other hand, the sound has a characteristic of frequency. For example, a low frequency band such as 100 Hz or 200 Hz and a high frequency band such as 2 KHz or 4 KHz. High-frequency noise is a noise component of a high-frequency component rather than a low-frequency component in a frequency component of a noise, such as a noise of a jet or a rivet-type sound of a construction site. Low-frequency noise refers to noise caused by low frequencies below 20 Hz that humans can not hear. Unlike normal noise, it can not feel noisy, but it can give a feeling of pressure to the human body and can vibrate a door or a window to generate a secondary noise.

In order to measure the low-frequency noise, the distance between the two microphones must be relatively wide. In order to measure the high-frequency noise, the distance between the two microphones must be relatively small. Therefore, in the present embodiment, as shown in FIGS. 5 and 6, three microphones are applied so as to separate sound by frequency bands of high frequency and low frequency.

For example, when the first microphone 11 and the second microphone 12 are used, a high frequency band is used. When the first microphone 11 and the third microphone 13 having a greater distance than the first microphone 11 and the second microphone 12 are used, they appear in a low frequency band. The distance between the first microphone 11 and the second microphone 12 is 5 to 30 mm to measure the noise in the high frequency band and the distance between the first microphone 11 and the third microphone 13 is 50 To 150 mm, it is possible to measure the noise in the low frequency band.

The signal converting unit 20 amplifies the noise signal from the sound sensor unit 10, converts the amplified noise signal into a digital signal, and outputs the digital signal.

The data processing unit 30 detects only the target noise from ambient noise using the converted data from the signal converting unit 20. [ For example, the data processing unit 30 may include a directionality detecting unit 31 for detecting a first direction noise including the target noise and a second direction noise including other peripheral noises. The data processor 30 includes a frequency detector 32 to detect the frequency band of the target noise from ambient noise using the data converted from the signal converter 20. [

That is, the directivity detecting unit generates a first direction noise signal in which the directivity is emphasized in the direction of the target sound source and a second direction noise signal in which the directivity is suppressed in the direction of the target sound source, with respect to the mixed noise signal, and the first direction noise signal and the second direction noise Signal is extracted from the first direction noise signal by masking the interference sound source signal included in the first direction noise signal based on the ratio between the signals, and referring to FIG. 6, the frequency band of the target sound source signal extracted from the frequency detector Can be detected.

The display unit 40 outputs a noise data analysis result to allow a manager to visually confirm the noise data.

10; Acoustic sensor units 11 to 13; microphone
20; A signal converter 30; The data processor
40; Display portion

Claims (7)

An acoustic sensor unit including a first microphone and a second microphone arranged in a straight line, the acoustic sensor unit receiving a mixed acoustic signal;
A signal converter for converting the acoustic signal inputted to the acoustic sensor unit into a digital signal;
And a directivity detector for detecting a first direction noise signal in which directionality is emphasized in the direction of the target sound source and a second direction noise signal in which the directivity is suppressed in the direction of the target sound source for the mixed sound signal, A data processor for extracting an object noise from the first direction noise by masking an interference sound source included in the first direction noise based on a ratio between the second direction noise signals;
And a noise measuring device. The method according to claim 1,
Wherein the directivity detecting unit detects a first direction noise signal from the first microphone to the second microphone and a second direction noise signal from the second microphone to the first microphone. The method according to claim 1,
Wherein the sound sensor unit further comprises a body for enclosing the first microphone and the second microphone. An acoustic sensor unit including a first microphone, a second microphone and a third microphone sequentially arranged in a straight line, the acoustic sensor receiving a mixed acoustic signal;
A signal converter for converting the acoustic signal inputted to the acoustic sensor unit into a digital signal;
And a directivity detector for generating a first direction noise signal in which directionality is emphasized in the direction of the target sound source and a second direction noise signal in which the directivity is suppressed in the direction of the target sound source for the mixed sound signal, And a second direction noise signal generating unit for generating a first direction noise signal by masking an interference sound source signal included in the first direction noise signal based on a ratio between the first direction noise signal and the second direction noise signal, A data processing unit having a frequency detecting unit for detecting the frequency of the received signal;
And a noise measuring device. 5. The method of claim 4,
Wherein the directivity detecting unit detects a first direction noise signal from the first microphone to the second microphone and a second direction noise signal from the second microphone to the first microphone. 5. The method of claim 4,
Wherein a distance between the first microphone and the second microphone for detecting the high frequency band is 5 to 30 mm and a distance between the first microphone and the third microphone for detecting the low frequency band is 50 to 150 mm. 5. The method of claim 4,
Wherein the sound sensor unit further includes a body that surrounds the first microphone, the second microphone, and the third microphone.
KR20130100206A 2013-08-23 2013-08-23 apparatus for measuring noise KR20150023139A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105181123A (en) * 2015-08-24 2015-12-23 哈尔滨工程大学 Directive near-field measurement data processing method for round-face piston radiator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105181123A (en) * 2015-08-24 2015-12-23 哈尔滨工程大学 Directive near-field measurement data processing method for round-face piston radiator
CN105181123B (en) * 2015-08-24 2018-04-24 哈尔滨工程大学 A kind of disc radiating of circular piston device directive property near field measurement data processing method

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