KR20080107820A - Noise reduction apparatus and method using offset of frequency without soundproof walls - Google Patents

Noise reduction apparatus and method using offset of frequency without soundproof walls Download PDF

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Publication number
KR20080107820A
KR20080107820A KR1020070056096A KR20070056096A KR20080107820A KR 20080107820 A KR20080107820 A KR 20080107820A KR 1020070056096 A KR1020070056096 A KR 1020070056096A KR 20070056096 A KR20070056096 A KR 20070056096A KR 20080107820 A KR20080107820 A KR 20080107820A
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KR
South Korea
Prior art keywords
signal
noise
digital
analog
roadside
Prior art date
Application number
KR1020070056096A
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Korean (ko)
Inventor
정운익
Original Assignee
레인보우스케이프주식회사
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Application filed by 레인보우스케이프주식회사 filed Critical 레인보우스케이프주식회사
Priority to KR1020070056096A priority Critical patent/KR20080107820A/en
Publication of KR20080107820A publication Critical patent/KR20080107820A/en

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3026—Feedback
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3028—Filtering, e.g. Kalman filters or special analogue or digital filters

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)

Abstract

A device and a method for reducing road noise by frequency compensation are provided to remove the road noise by measuring the road noise at a high speed and transmitting compensating sound against the noise. A device for reducing road noise includes a high performance microphone(110) for collecting road noise, an analogue-digital converter(120) for converting analogue noise signals sensed by the microphone to digital signals, a signal processing and controlling part(130) for extracting the digital noise signals and generating compensating signals therefore, a digital-analogue converter(140) for converting the generated digital compensating signals to analogue signals, an amplifier(150) for amplifying the compensating signals according to a control signal and a speaker(160) for converting the amplified analogue signals to sound waves to transmit the same to roads.

Description

Roadside Noise Reduction Apparatus and Method Using Frequency Cancellation {NOISE REDUCTION APPARATUS AND METHOD USING OFFSET OF FREQUENCY WITHOUT SOUNDPROOF WALLS}

1 is a view showing an installation state of the noise reduction device according to the present invention,

Figure 2 is a block diagram showing the configuration of a noise reduction device according to the present invention,

3 is a flowchart illustrating a noise reduction procedure according to the present invention;

4 is a view for explaining a noise canceling concept according to the present invention;

5 is a flowchart showing a noise reduction procedure according to another embodiment of the present invention;

Figure 6 is a schematic diagram showing a conventional noise reduction method using a soundproof wall.

* Explanation of symbols for main parts of the drawings

10: road 12: street lamp

14: support 20: vehicle

100: noise reduction device 102: vehicle detection sensor

110: high performance microphone 120: analog-to-digital converter

130: control unit 132: noise signal extraction unit

134: offset signal generator 140: digital-to-analog converter

150: amplifier 160: speaker

The present invention relates to an apparatus and method for reducing noise generated on a roadside, and more particularly, to an apparatus and method for reducing noise generated on a roadside without a soundproof wall using frequency offset.

In general, as shown in FIG. 6, a soundproof wall 62 is provided around the road or the track to prevent noise generated from the vehicle 20 traveling on the road 10 or the train running on the track from being transmitted to the residence. It is installed. Referring to FIG. 6, noise barriers 62 having a predetermined height are installed on both sides or one side of the roadside, and the noise barriers 62 block noise generated by a vehicle traveling on the road 10.

However, these sound barriers not only impair urban aesthetics, but also impede airflow, impede circulation of microclimate due to convection, inferior solar conditions due to shade, and require high construction costs for installing sound barriers. .

The present invention has been proposed to solve the above problems, an object of the present invention is to provide a roadside noise reduction device and method using a frequency offset that can reduce the noise generated on the roadside without a soundproof wall using the frequency offset. It is.

In order to achieve the above object, the device of the present invention, a high-performance microphone for collecting the noise generated on the road side; An analog-digital converter for converting the analog noise signal detected by the high performance microphone into digital; A signal processing and control unit for extracting the digitally converted noise signal and generating an offset signal for canceling it; A digital to analog converter for converting the generated digital cancellation signal into an analog signal; An amplifier for amplifying the canceled signal converted into analog according to a control signal; And a speaker for converting the analog signal of the amplifier into sound waves and transmitting the sound toward the roadside.

The noise reduction device may further include a vehicle detection sensor for detecting a vehicle to operate only when the vehicle is detected, and is preferably installed at a street lamp pole, a pole pole, or a dedicated support on a roadside.

In addition, in order to achieve the above object, the device of the present invention, if the vehicle generated on the road side detecting the noise with the microphone; Extracting the noise signal by converting the analog noise signal detected by the microphone into a digital signal and then filtering the analog noise signal; Generating an out-of-phase cancel signal for canceling the extracted noise signal; Converting the digital cancellation signal into an analog signal and then amplifying the digital signal; And converting the amplified offset signal into an offset sound through a speaker and transmitting the canceled signal to the road side.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an installation state of the noise reduction device according to the present invention, Figure 2 is a block diagram showing the configuration of the noise reduction device according to the present invention.

As shown in Figure 1, the noise reduction device according to the present invention can be installed on the street lamp pole 12 or electric pole located on the side of the road 10 without a soundproof wall, and the dedicated support 14 after embedding the dedicated support 14 as necessary It can also be installed in (14). Thus, the noise reduction device 100 of the present invention installed on the side of the road inputs the noise generated by the vehicle 20 traveling on the road 10 through the microphone and then generates a signal in which the phase is reversed to cancel the noise. By outputting to the side of the road through the speaker to cancel the noise by canceling the noise signal generated from the side of the road.

As shown in FIG. 2, the noise reduction device 100 of the present invention includes a vehicle detection sensor 102 for detecting a vehicle, a high performance microphone 110 for collecting noise generated from a road side, and a high performance microphone. Analog-to-digital converter 120 for converting the analog noise signal detected in 110 to digital, the signal processing and control unit 130 for generating a cancel signal for canceling and then canceling the digitally converted noise signal, generated A digital analog converter 140 for converting a digital cancel signal into an analog signal, an amplifier 150 for amplifying the analog canceled signal according to a control signal, and converting an analog signal of the amplifier 150 into sound waves and sending them toward the roadside. It is composed of a speaker (160). The signal processing and control unit 130 includes, for example, a digital signal processor (DSP) and the like, and includes a portion 132 for extracting a noise signal and a portion 134 for generating an offset signal.

As illustrated in FIG. 3, when the vehicle 20 is detected, the noise reduction device 100 of the present invention configured as described above detects noise with the microphone 110 (S301 and S302). Subsequently, the analog noise signal detected by the microphone 110 is converted into digital and then filtered, and the noise signal is extracted (S303 to S305).

Subsequently, an antiphase signal for canceling the noise signal is generated as shown in FIG. 4, the digital data is converted into an analog signal, and then amplified by the amplifier 150, and the offset sound is transmitted to the road side through the speaker 160 (S306 ˜ ~). S309). Normally, the cancellation signal is a signal having the same frequency and magnitude as the noise signal, and having a phase different from 180 °, as shown in FIG.

Accordingly, the noise generated on the side of the road is canceled by the offset sound of the reverse phase can reduce the noise.

In one embodiment of the present invention, the sound generated at the roadside scene is collected in real time to generate an offset sound to cancel the noise, or in another embodiment to be described later, the roadside noise is learned for a predetermined period using artificial intelligence. After the learning, the noise can be suppressed more actively in consideration of the stored noise condition.

5 is a flowchart illustrating a noise reduction procedure according to another embodiment of the present invention. Another embodiment is to effectively suppress noise after learning noise using artificial intelligence.

Referring to Figure 5, after measuring the noise in the learning period to learn the various parameters of the noise (S501 ~ S503). When the learning is completed, the offset sound is generated in response to the learned noise, and the offset sound is output through the speaker (S504 to S505).

As described above, in another embodiment of the present invention, the noise of the roadside may be learned for a predetermined period, and after sufficiently analyzing the noise signal generated from the roadside, the offset signal may be more efficiently generated. At this time, the offset signal is the same as the frequency or magnitude with respect to the noise signal as shown in Figure 4, but when the phase is 180 ° sum the two signals to be noise is removed.

Although the present invention has been described in detail through specific embodiments, the present invention is not limited to the above-described embodiments, and various changes may be made by those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention. It may be changed and implemented.

As described above, according to the present invention, after the noise reduction device is installed in the street lamp pole, pole or support of the road side, the noise generated from the road side is measured at high speed and the offset sound for canceling the noise is sent back to the side of the road. The noise generated can be removed. In particular, according to the present invention, there is no need to install a soundproof wall on the side of the road, so that the problems caused by the soundproof wall, namely, not only hurt the urban aesthetics, but also impede the airflow, make the circulation of the microclimate impossible by convection, and shade the sun It can be made worse and solve the problem of high construction cost for installing the soundproof wall.

Claims (5)

A high performance microphone for collecting noise generated on the road side; An analog-digital converter for converting the analog noise signal detected by the high performance microphone into digital; A signal processing and control unit for extracting the digitally converted noise signal and generating an offset signal for canceling it; A digital to analog converter for converting the generated digital cancellation signal into an analog signal; An amplifier for amplifying the canceled signal converted into analog according to a control signal; And Roadside noise reduction device using the frequency cancellation characterized in that it comprises a speaker for converting the analog signal of the amplifier into sound waves and sent toward the roadside. According to claim 1, wherein the noise reduction device A roadside noise reduction device using frequency offset, further comprising a vehicle detection sensor for detecting a vehicle to operate only when the vehicle is detected. According to claim 1 or 2, wherein the noise reduction device Roadside noise reduction device using the frequency offset, characterized in that installed on the streetlight pole or pole, dedicated support on the side of the road. Detecting noise by a microphone when a vehicle is detected; Extracting the noise signal by converting the analog noise signal detected by the microphone into a digital signal and then filtering the analog noise signal; Generating an out-of-phase cancel signal for canceling the extracted noise signal; Converting the digital cancellation signal into an analog signal and then amplifying the digital signal; And And converting the amplified offset signal into an offset sound through a speaker and transmitting it to the road side. The noise generated from the road side is canceled by an offset signal of a reverse phase to reduce the noise. Roadside noise reduction method. The method of claim 4, wherein the generating of the cancellation signal comprises: The roadside noise reduction method using the frequency offset, characterized in that after learning the noise of the roadside using artificial intelligence for a period of time, the noise generated from the roadside to generate the offset signal.
KR1020070056096A 2007-06-08 2007-06-08 Noise reduction apparatus and method using offset of frequency without soundproof walls KR20080107820A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100953211B1 (en) * 2009-10-08 2010-04-15 차상곤 Noise reducing apparatus
KR101124864B1 (en) * 2009-12-08 2012-03-28 김현주 Noise reducing apparatus
WO2014051199A1 (en) * 2012-09-28 2014-04-03 한국건설기술연구원 Method and device for reducing traffic noise using vehicle sensor
CN110010118A (en) * 2019-04-16 2019-07-12 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） A kind of Active noise control system being integrated in roadway lighting system
KR20190104925A (en) * 2019-08-22 2019-09-11 엘지전자 주식회사 Engine sound cancellation device and engine sound cancellation method
KR20220063014A (en) 2020-11-09 2022-05-17 유소문 Apparatus and Method for Imjecting Audio frequency to Prevent of Motion sickness

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100953211B1 (en) * 2009-10-08 2010-04-15 차상곤 Noise reducing apparatus
KR101124864B1 (en) * 2009-12-08 2012-03-28 김현주 Noise reducing apparatus
WO2014051199A1 (en) * 2012-09-28 2014-04-03 한국건설기술연구원 Method and device for reducing traffic noise using vehicle sensor
CN110010118A (en) * 2019-04-16 2019-07-12 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） A kind of Active noise control system being integrated in roadway lighting system
KR20190104925A (en) * 2019-08-22 2019-09-11 엘지전자 주식회사 Engine sound cancellation device and engine sound cancellation method
KR20220063014A (en) 2020-11-09 2022-05-17 유소문 Apparatus and Method for Imjecting Audio frequency to Prevent of Motion sickness

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