KR20130044021A - Multi-channel active noise control device - Google Patents

Multi-channel active noise control device Download PDF

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KR20130044021A
KR20130044021A KR1020110108261A KR20110108261A KR20130044021A KR 20130044021 A KR20130044021 A KR 20130044021A KR 1020110108261 A KR1020110108261 A KR 1020110108261A KR 20110108261 A KR20110108261 A KR 20110108261A KR 20130044021 A KR20130044021 A KR 20130044021A
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South Korea
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noise
indoor
control device
active noise
speed railway
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KR1020110108261A
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Korean (ko)
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이권순
박성원
박지호
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이권순
(주)보강하이텍
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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
    • G10K2210/12—Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
    • 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
    • G10K2210/1283—Trains, trams or the like
    • 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)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

PURPOSE: A multi-channel active noise control device for reducing the indoor noise of a high-speed railway is provided to offset noise by generating noise with a phase opposite to that of the indoor noise of a railway vehicle, thereby reducing the indoor noise. CONSTITUTION: A multi-channel active noise control device for reducing the indoor noise of a high-speed railway comprises a standard microphone(100), a control speaker(200), an error microphone(300), and an active noise controller(400). The standard microphone measures the indoor noise of a railway vehicle. The control speaker generates noise with a phase opposite to that of the indoor noise measured by the standard microphone. The error microphone measures a difference of the indoor noise and the noise with the opposite phase. The active noise controller offsets the indoor noise by using the noise with the opposite phase.

Description

고속철도 실내소음 저감용 다중채널 능동소음 제어장치{Multi-channel active noise control device}Multi-channel active noise control device for reducing indoor noise of high-speed railways

본 발명은 고속철도 실내소음 저감용 다중채널 능동소음 제어장치에 관한 것으로, 보다 자세하게는 철도차량의 실내에서 발생하는 소음과 반대 위상을 갖는 소음을 발생시켜 소음을 서로 상쇄함으로써 실내 소음을 저감시키도록 하는 고속철도 실내소음 저감용 다중채널 능동소음 제어장치에 관한 것이다.
The present invention relates to a multi-channel active noise control device for reducing indoor noise of a high-speed railway, and more particularly, to reduce indoor noise by generating noise having a phase opposite to that generated in a room of a railroad car. The present invention relates to a multi-channel active noise control device for reducing indoor noise of high-speed railway.

일반적으로 철도차량의 운행 중에 발생하는 소음을 저감시키기 위하여 흡음재, 방음벽 등을 사용하여 물리적으로 소음을 차단하는 물리적 소음 격리방식이 사용되고 있다.In general, in order to reduce noise generated while operating a railway vehicle, a physical noise isolation method using a sound absorbing material, a soundproof wall, and the like to physically block noise is used.

그러나 이러한 물리적 소음 격리방식에 따르면, 소음이 발생하는 여러 영역들에 일일이 흡음재나 방음벽을 설치해야 하기 때문에 비용적 측면에서 문제점이 있을 뿐만 아니라, 소음 저감의 효율적인 측면에서도 한계가 있다는 문제점이 있다.However, according to the physical noise isolation method, there is a problem in terms of cost, and there is a limit in terms of efficient noise reduction, because the sound absorbing material or soundproof walls must be installed in various areas where noise is generated.

또한, 흡음재나 방음벽을 사용할 경우, 1,000Hz이상의 주파수를 가지는 소음에 대해서는 효과적인 성능을 발휘하지만 저주파 소음의 경우, 특히 500Hz 미만의 소음을 제거하기 위해서는 흡음재의 무게가 늘어나고 비용이 증가하며, 열화가 일어나는 등의 문제가 발생하여 사용하기 어려운 문제점이 있다.
In addition, when the sound absorbing material or soundproof wall is used, it shows an effective performance against the noise having a frequency of more than 1,000 Hz, but in the case of low frequency noise, the weight of the sound absorbing material is increased, the cost increases, and deterioration occurs especially in order to remove the noise below 500 Hz. There is a problem such as difficult to use.

상기와 같은 종래 기술의 문제점을 해결하기 위하여 안출된 본 발명은 철도차량의 실내에서 발생하는 소음과 반대 위상을 갖는 소음을 발생시켜 소음을 서로 상쇄함으로써 실내 소음을 저감시키도록 하는 고속철도 실내소음 저감용 다중채널 능동소음 제어장치를 제공함에 그 목적이 있다.
The present invention devised to solve the problems of the prior art as described above for reducing the indoor noise of high-speed rail to reduce the indoor noise by generating noise having a phase opposite to the noise generated in the interior of the railway vehicle to cancel the noise from each other Its purpose is to provide a multi-channel active noise control device.

본 발명의 상기 목적은 철도차량의 실내소음을 측정하기 위한 기준마이크; 상기 기준마이크로부터 측정된 실내소음과 반대 위상을 갖는 소음을 생성하기 위한 제어스피커; 상기 실내소음과 상기 반대 위상을 갖는 소음의 차이를 측정하기 위한 에러마이크; 및 상기 실내소음과 상기 반대 위상을 갖는 소음을 이용하여 소음을 상쇄시키기 위한 능동소음제어기를 포함하는 고속철도 실내소음 저감용 다중채널 능동소음 제어장치에 의해 달성된다.The object of the present invention is a reference microphone for measuring the indoor noise of a railway vehicle; A control speaker for generating noise having a phase opposite to the measured indoor noise from the reference microphone; An error microphone for measuring a difference between the indoor noise and the noise having the opposite phase; And an active noise controller for canceling the noise by using the noise having the opposite phase with the indoor noise.

또한, 본 발명의 제어스피커와 상기 에러마이크는 각각 하나 이상으로 구성되어 다중 채널인 것이 바람직하다.In addition, the control speaker and the error microphone of the present invention is preferably composed of one or more, it is preferably a multi-channel.

또한, 본 발명의 능동소음제어기는 입력신호에서 입력신호에 포함되어 있는 원하는 정보만을 추출하여 출력신호로 내보내기 위한 디지털 필터부; 및 다양한 주파수 영역에 분포하여 순시 가변하는 철도차량 실내소음의 비선형 특성에 대응하는 제어신호를 생성하기 위한 상기 디지털 필터부의 계수를 능동적으로 가변하기 위한 제어알고리즘부를 포함하는 것이 바람직하다.
In addition, the active noise controller of the present invention includes a digital filter unit for extracting only the desired information contained in the input signal from the input signal to the output signal; And a control algorithm unit for actively varying coefficients of the digital filter unit for generating a control signal corresponding to the nonlinear characteristics of the indoor noise of the railway vehicle which are distributed in various frequency ranges.

따라서, 본 발명의 고속철도 실내소음 저감용 다중채널 능동소음 제어장치는 철도차량의 실내에서 발생하는 소음과 반대 위상을 갖는 소음을 발생시켜 소음을 서로 상쇄함으로써 실내 소음을 저감시키도록 하는 효과가 있다.Therefore, the multi-channel active noise control device for reducing indoor noise of the high-speed railway of the present invention has the effect of reducing the indoor noise by canceling the noises by generating noises having a phase opposite to that generated in the interior of a railway vehicle.

또한, 본 발명은 필터의 가중치 벡터를 갱신시켜 실시간으로 소음제어가 가능토록 하는 다른 효과가 있다.
In addition, the present invention has another effect of enabling noise control in real time by updating the weight vector of the filter.

도 1은 본 발명의 실시예에 따른 고속철도 실내소음 저감용 다중채널 능동소음 제어장치의 구성도,
도 2는 본 발명의 실시예에 따른 다중채널의 구성도,
도 3은 본 발명의 실시예에 따른 능동소음 제어기의 구성도,
도 4는 본 발명의 실시예에 따른 FIR 필터의 구조,
도 5는 본 발명의 실시예에 따른 FXLMS 능동소음 제어기에 관한 구성도,
도 6은 본 발명의 실시예에 따른 다중 채널 FXLMS 능동소음 제어기의 구성도이다.1 is a block diagram of a multi-channel active noise control device for reducing indoor noise of high-speed railway according to an embodiment of the present invention,
2 is a configuration diagram of a multi-channel according to an embodiment of the present invention;
3 is a block diagram of an active noise controller according to an embodiment of the present invention;
4 is a structure of a FIR filter according to an embodiment of the present invention,
5 is a block diagram of an FXLMS active noise controller according to an embodiment of the present invention;
6 is a block diagram of a multi-channel FXLMS active noise controller according to an embodiment of the present invention.

본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다.The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

따라서, 본 명세서에 기재된 실시예와 도면에 도시된 구성은 본 발명의 가장 바람직한 일 실시예에 불과할 뿐이고 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로, 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물과 변형예들이 있을 수 있음을 이해하여야 한다.Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

이하 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명하기로 한다. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 실시예에 따른 고속철도 실내소음 저감용 다중채널 능동소음 제어장치이다. 도 1을 참조하면, 능동소음 제어장치는 기준마이크(100), 제어스피커(200), 에러마이크(300) 및 능동소음 제어기(400)를 포함한다.1 is a multi-channel active noise control device for reducing indoor noise of high-speed railway according to an embodiment of the present invention. Referring to FIG. 1, the active noise control apparatus includes a reference microphone 100, a control speaker 200, an error microphone 300, and an active noise controller 400.

기준마이크(100)는 철도차량의 실내소음을 측정하고, 제어스피커(200)는 철도차량 실내소음과 반대 위상을 갖는 소음을 발생시킨다. 에러마이크(300)는 실제 철도차량 실내소음과 제어스피커(200)에서 발생시키는 반대 위상을 갖는 소음의 차이를 측정하며, 능동소음 제어기(400)는 철도차량에서 발생된 실내소음과 제어스피커(200)에서 발생시킨 반대 위상을 갖는 소음을 이용하여 소음을 상쇄시키도록 한다.The reference microphone 100 measures indoor noise of the railroad car, and the control speaker 200 generates noise having a phase opposite to that of the railroad car. The error microphone 300 measures the difference between the actual noise of the indoor vehicle and the noise having the opposite phase generated by the control speaker 200, and the active noise controller 400 measures the indoor noise and the control speaker 200 generated by the railway vehicle. The noise with the opposite phase generated in) is used to cancel the noise.

철도차량의 실내소음은 특정되지 않은 다수의 장소에서 발생되므로 도 2와 같이 능동소음 제어장치는 하나 이상의 제어스피커(200)와 에러마이크(300)로 구성된 다중채널 방식을 이용하는 것이 바람직하다.Since the indoor noise of the railway vehicle is generated in a number of places that are not specified, as shown in FIG. 2, the active noise control device preferably uses a multi-channel method including one or more control speakers 200 and an error microphone 300.

능동소음 제어기(400)는 도 3과 같이 디지털 필터부(410)과 제어알고리즘부(420)로 구성된 디지털 적응필터(400)이다.The active noise controller 400 is a digital adaptive filter 400 composed of a digital filter unit 410 and a control algorithm unit 420 as shown in FIG. 3.

능동소음 제어기(400)는 출력신호 y(n)과 기준신호 d(n)의 오차신호 e(n)가 최소화되어야 기준신호 d(n)와 위상이 가장 근접하게 반대인 소음을 저감할 수 있는 제어신호를 만들 수 있기 때문에 디지털 적응필터를 사용한다.The active noise controller 400 can reduce noise whose phase is most closely opposite to the reference signal d (n) only when the error signal e (n) of the output signal y (n) and the reference signal d (n) is minimized. Digital adaptive filters are used because they can produce control signals.

디지털 필터부(410)는 입력신호에서 입력신호에 포함되어 있는 원하는 정보만을 추출하여 출력신호로 내보내며, 제어알고리즘부(420)는 다양한 주파수 영역에 분포하여 순시 가변하는 철도차량 실내소음의 비선형 특성에 대응하는 제어신호를 생성하기 위한 디지털 필터부(410)의 계수를 능동적으로 가변한다.The digital filter unit 410 extracts only the desired information included in the input signal from the input signal and outputs it as an output signal, and the control algorithm unit 420 is distributed in various frequency ranges and nonlinear characteristics of indoor noise of a railway vehicle which are instantaneously variable. The coefficient of the digital filter unit 410 for generating a control signal corresponding to the variable is actively changed.

능동소음 제어기(400)는 빠른 연산시간을 필요로 하므로 고속연산이 가능한 DSP(Digital Signal Processor)를 이용한다.The active noise controller 400 requires a fast operation time and thus uses a DSP (Digital Signal Processor) capable of high speed operation.

도 3에 기재된 x(n)은 기준 입력신호(reference input signal), d(n)은 원하는 응답 신호(desired response), y(n)은 디지털 필터의 출력(output of a digital filter), e(n)은 디지털 필터의 오차(residual error)를 뜻한다.In FIG. 3, x (n) is a reference input signal, d (n) is a desired response, y (n) is an output of a digital filter, e ( n) means the residual error of the digital filter.

디지털 필터부(410)는 FIR(Finite Impulse Response) 구조를 사용하며, 제어알고리즘부(420)는 FXLMS(Filtered-X Least Mean Square)알고리즘을 이용한다.The digital filter unit 410 uses a Finite Impulse Response (FIR) structure, and the control algorithm unit 420 uses a Filtered-X Least Mean Square (FXLMS) algorithm.

FIR 필터는 임펄스 응답이 유한한 필터이고, 구조가 간단하여 귀한 루프가 없어 극점이 존재하지 않아 안정성이 보장된다.The FIR filter has a finite impulse response, and the structure is simple, so there are no precious loops, so there is no pole to ensure stability.

도 4는 본 발명의 실시예에 따른 FIR 필터의 구조이다.4 is a structure of a FIR filter according to an embodiment of the present invention.

Figure pat00001
Figure pat00001

Figure pat00002
: L차의 필터계수 항
Figure pat00002
: Filter coefficient term of Lth order

이 된다. 이때, 입력신호와 디지털 필터부(410) 계수벡터를. At this time, the input signal and the coefficient vector of the digital filter unit 410

Figure pat00003
Figure pat00003

Figure pat00004
Figure pat00004

라고 정의하면, 디지털 필터부(410)의 출력 값과 이때의 오차 값은 In this case, the output value of the digital filter unit 410 and the error value at this time are

Figure pat00005
Figure pat00005

Figure pat00006
Figure pat00006

이 된다..

도 5는 본 발명의 실시예에 따른 FXLMS 능동소음 제어기에 관한 구성도이다.5 is a block diagram of an FXLMS active noise controller according to an embodiment of the present invention.

도 1에 나타난 고속철도 실내소음 저감용 다중채널 능동소음 제어장치에서 능동소음 제어기는 오차신호e(n)와 제어신호y(n) 사이에 존재하는 부가경로 전달함수 S(z)로 인하여 소음신호x(n)와 제어신호y(n)의 위상이 맞지 않아 시스템이 불안정하게 된다. In the multi-channel active noise control apparatus for reducing indoor noise of the high-speed railway shown in FIG. 1, the active noise controller is a noise signal x due to the additional path transfer function S (z) existing between the error signal e (n) and the control signal y (n). The system becomes unstable because the phase of (n) and the control signal y (n) do not match.

이에, FIR필터에 의해

Figure pat00007
으로 2차 경로를 추정한 후 적응필터의 가중치를 갱신하여 불안정해지는 문제점을 해결할 수 있는데, 이러한 방법을 FXLMS ANC 시스템이라고 한다.Thus, the FIR filter
Figure pat00007
By estimating the secondary path, we can solve the problem of instability by updating the weight of the adaptive filter. This method is called FXLMS ANC system.

도 5를 살펴보면,Looking at Figure 5,

시간 n에서의 오차신호 e(n)은 다음과 같다.The error signal e (n) at time n is

Figure pat00008
Figure pat00008

Figure pat00009
Figure pat00009

Figure pat00010
Figure pat00010

여기서 s(n)은 2차 경로 전달함수 S(z)의 충격응답이며,

Figure pat00011
는 선형 합성적분(convolution)을 나타낸다.Where s (n) is the impact response of the secondary path transfer function S (z),
Figure pat00011
Denotes a linear convolution.

이를 W에 대하여 미분하면Differentiate this with respect to W

Figure pat00012
Figure pat00012

X는 아래와 같이 정의된다.X is defined as

Figure pat00013
Figure pat00013

FXLMS 알고리즘은 아래와 같이 주어진다.The FXLMS algorithm is given by

Figure pat00014
Figure pat00014

여기서 w(n)은 시간 n에서 디지털 필터부 W(z)의 계수벡터이며, 필터링된 입력벡터 x'(n)은 2차 경로필터

Figure pat00015
를 통과시켜서 구할 수 있다.Where w (n) is the coefficient vector of the digital filter unit W (z) at time n, and the filtered input vector x '(n) is the secondary path filter.
Figure pat00015
Can be obtained by passing

X'(n)을 2차 경로 전달함수 s(n) 대신에 2차 경로 전달함수를 추정한

Figure pat00016
를 적용하면
Figure pat00017
이다.X '(n) is estimated instead of the secondary path transfer function s (n).
Figure pat00016
If you apply
Figure pat00017
to be.

Figure pat00018
Figure pat00018

여기서

Figure pat00019
은 2차 경로
Figure pat00020
의 충격응답이다. 실제로 능동소음제어를 수행할 때는 사전에 2차 경로 전달함수 S(z)의 충격응답
Figure pat00021
을 구하거나 추정하여 사용한다.here
Figure pat00019
Silver secondary path
Figure pat00020
Shock response. In fact, when active noise control is carried out, the shock response of the second path transfer function S (z) in advance
Figure pat00021
Obtain or estimate

[실시예][Example]

2개의 제어스피커와 2차의 오차마이크를 가지고 있는 1*2*2의 다중채널 구조로 소음저감 시뮬레이션을 하였으며, 1*2*2의 다중채널에 맞게 FXLMS를 구성하였다.The noise reduction simulation was performed with a 1 * 2 * 2 multichannel structure with two control speakers and a second error microphone, and the FXLMS was configured for 1 * 2 * 2 multichannel.

도 6은 본 발명의 실시예에 따른 다중 채널 FXLMS 능동소음 제어기의 구성도이다.6 is a block diagram of a multi-channel FXLMS active noise controller according to an embodiment of the present invention.

시간 n에서 입력신호가 디지털 필터부를 통해 나오는 출력은 다음과 같다.The output of the input signal through the digital filter at time n is

Figure pat00022
Figure pat00022

Figure pat00023
Figure pat00023

여기서, here,

Figure pat00024
Figure pat00024

Figure pat00025
Figure pat00025

Figure pat00026
Figure pat00026

2차 경로 추정을 통하여 추정된 입력신호 x'(n)은 다음과 같다.The input signal x '(n) estimated through the second path estimation is as follows.

Figure pat00027
Figure pat00027

I : FIR 필터

Figure pat00028
의 차수 (m,k=1,2)I: FIR Filter
Figure pat00028
Degree of (m, k = 1,2)

디지털 필터부에 새로운 소음신호가 계속 입력되기 때문에 아래와 같이 필터의 가중치 벡터를 갱신시켜 실시간으로 소음 제어가 가능하도록 한다.Since a new noise signal is continuously input to the digital filter unit, the weight vector of the filter is updated as follows to enable noise control in real time.

Figure pat00029
Figure pat00029

Figure pat00030
Figure pat00030

본 발명은 이상에서 살펴본 바와 같이 바람직한 실시예를 들어 도시하고 설명하였으나, 상기한 실시예에 한정되지 아니하며 본 발명의 정신을 벗어나지 않는 범위 내에서 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 다양한 변경과 수정이 가능할 것이다.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.

100 : 기준마이크 200 : 제어스피커
300 : 에러마이크 400 : 능동소음 제어기100: reference microphone 200: control speaker
300: error microphone 400: active noise controller

Claims (4)

고속철도 실내소음 저감용 다중채널 능동소음 제어장치에 있어서,
철도차량의 실내소음을 측정하기 위한 기준마이크;
상기 기준마이크로부터 측정된 실내소음과 반대 위상을 갖는 소음을 생성하기 위한 제어스피커;
상기 실내소음과 상기 반대 위상을 갖는 소음의 차이를 측정하기 위한 에러마이크; 및
상기 실내소음과 상기 반대 위상을 갖는 소음을 이용하여 소음을 상쇄시키기 위한 능동소음제어기
를 포함하는 고속철도 실내소음 저감용 다중채널 능동소음 제어장치.
In the multi-channel active noise control device for reducing indoor noise of high-speed railway,
A reference microphone for measuring indoor noise of a railway vehicle;
A control speaker for generating noise having a phase opposite to the measured indoor noise from the reference microphone;
An error microphone for measuring a difference between the indoor noise and the noise having the opposite phase; And
Active noise controller for canceling the noise by using the indoor noise and the noise having the opposite phase
Multi-channel active noise control device for reducing indoor noise of high-speed railway.
제 1항에 있어서,
상기 제어스피커와 상기 에러마이크는 각각 하나 이상으로 구성되어 다중 채널인 것을 특징으로 하는 고속철도 실내소음 저감용 다중채널 능동소음 제어장치.
The method of claim 1,
The control speaker and the error microphone is composed of one or more, multi-channel active noise control device for indoor noise reduction of high-speed railway, characterized in that the multi-channel.
제 1항에 있어서, 상기 능동소음제어기는,
입력신호에서 입력신호에 포함되어 있는 원하는 정보만을 추출하여 출력신호로 내보내기 위한 디지털 필터부; 및
다양한 주파수 영역에 분포하여 순시 가변하는 철도차량 실내소음의 비선형 특성에 대응하는 제어신호를 생성하기 위한 상기 디지털 필터부의 계수를 능동적으로 가변하기 위한 제어알고리즘부
를 포함하는 것을 특징으로 하는 고속철도 실내소음 저감용 다중채널 능동소음 제어장치.
The method of claim 1, wherein the active noise controller,
A digital filter unit for extracting only desired information included in the input signal from the input signal and outputting the extracted information as an output signal; And
Control algorithm unit for actively varying the coefficient of the digital filter unit for generating a control signal corresponding to the nonlinear characteristics of the indoor noise of the railroad vehicle that is instantaneously variable in various frequency ranges
Multi-channel active noise control device for reducing indoor noise of high-speed railway, including.
제 3항에 있어서, 상기 디지털 필터부는,
Figure pat00031

Figure pat00032

를 통해 상기 디지털 필터부의 가중치 벡터를 갱신하여 소음 제어를 하는 것을 특징으로 하는 고속철도 실내소음 저감용 다중채널 능동소음 제어장치.

The method of claim 3, wherein the digital filter unit,
Figure pat00031

Figure pat00032

Multi-channel active noise control device for noise reduction in the high-speed railway, characterized in that for controlling the noise by updating the weight vector of the digital filter through.

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015111827A1 (en) * 2014-01-23 2015-07-30 강릉원주대학교산학협력단 Device and method for noise control and attenuation induction
CN105103219A (en) * 2013-11-11 2015-11-25 赵春宁 Noise reduction method
CN106911982A (en) * 2015-12-23 2017-06-30 哈曼贝克自动系统股份有限公司 Outside coupling speaker system
CN112581931A (en) * 2020-12-28 2021-03-30 中国电力工程顾问集团西北电力设计院有限公司 Indoor noise reduction method and system applied to thermal power plant
KR102563584B1 (en) 2022-11-25 2023-08-07 한승영 A railway vehicle noise reduction system based on neural network

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105103219A (en) * 2013-11-11 2015-11-25 赵春宁 Noise reduction method
WO2015111827A1 (en) * 2014-01-23 2015-07-30 강릉원주대학교산학협력단 Device and method for noise control and attenuation induction
CN106911982A (en) * 2015-12-23 2017-06-30 哈曼贝克自动系统股份有限公司 Outside coupling speaker system
CN112581931A (en) * 2020-12-28 2021-03-30 中国电力工程顾问集团西北电力设计院有限公司 Indoor noise reduction method and system applied to thermal power plant
KR102563584B1 (en) 2022-11-25 2023-08-07 한승영 A railway vehicle noise reduction system based on neural network

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