KR100259483B1 - A synthesizing apparatus of control signals for active noise control - Google Patents

A synthesizing apparatus of control signals for active noise control Download PDF

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KR100259483B1
KR100259483B1 KR1019970038761A KR19970038761A KR100259483B1 KR 100259483 B1 KR100259483 B1 KR 100259483B1 KR 1019970038761 A KR1019970038761 A KR 1019970038761A KR 19970038761 A KR19970038761 A KR 19970038761A KR 100259483 B1 KR100259483 B1 KR 100259483B1
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noise
control
signal
signals
output
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KR1019970038761A
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Korean (ko)
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KR19990016276A (en
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김주완
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구자홍
엘지전자주식회사
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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
    • G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • 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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • 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
    • 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
    • G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

PURPOSE: A control signal composing device in an active noise control is provided to remove noise having no single tone but with complex tone elements with active noise control by composing various control signals. CONSTITUTION: A control signal composing device in an active noise control includes a plurality of wide band pass filters(113) for filtering noise signal of desired frequency element, a control part(120) converting, inputting and outputting the filtered noise signals into data type and compensating error between the noise signals and control signal output to a prescribed signal composing part according to each frequency, a plurality of low pass filters(130) filtering the noise signals and removing noise of high frequency elements, a signal composing part(140) generating control signal having inverted phase in the same amplitude through a summing amplifier, and an output part(152) amplifying and outputting control signal output from the signal composing part and offsetting noise source.

Description

능동소음제어에서의 제어신호 합성장치{A synthesizing apparatus of control signals for active noise control}A synthesizing apparatus of control signals for active noise control

본 발명은 능동소음제어(Active Noise Control; ANC)에 관한 것으로, 특히 복수의 주파수 성분을 가진 소음을 제어하기 위해 복수의 제어신호를 하드웨어적으로 합성함으로써 하나의 주파수(Single Tone)가 아닌 여러 개의 주파수 성분을 가진 소음을 능동소음제어로 용이하게 제거할 수 있는 능동소음제어에서의 제어신호 합성 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to Active Noise Control (ANC), and in particular, by synthesizing a plurality of control signals in hardware to control noise having a plurality of frequency components, it is possible The present invention relates to a control signal synthesizing apparatus in active noise control that can easily remove noise having a frequency component by active noise control.

일반적인 능동소음제어의 기본 원리는 도 1 에 도시된 바와 같이, 소음원(1)으로부터 발생된 소음신호(1a)와 진폭은 같고 위상은 반대인 제어신호(2a)를 제어용 스피커(2)를 통해 인공적으로 발생시켜 두 신호를 같은 공간 내에서 상호 중첩되게 하면 두 신호가 상쇄되어 소음이 제거되게 된다.The basic principle of the active noise control in general is as shown in Figure 1, the control signal (2a) of the same amplitude and opposite phase to the noise signal (1a) generated from the noise source 1 artificially through the control speaker (2) If the two signals overlap each other in the same space, the two signals cancel to remove noise.

이러한 원리를 응용한 종래 기술에서는 시간에 따라 소음신호가 바뀌고 여러개의 주파수 성분을 갖는 경우에는 도 2 에 도시된 바와 같이, 적응능력을 갖게 하기 위해 임펄스 응답(Impulse Response)을 근거로 한 전달함수를 구하고, 이를 실시간으로 처리할 수 있는 빠른 연산 능력을 지닌 하드웨어적 수단인 DSP(Digital Signal Processor) 칩을 이용하여 각각의 주파수 성분에 대한 연산 처리를 행하여 보상 및 합성처리 과정을 거친 후 최종적으로 제어신호를 출력하게 된다.In the prior art applying this principle, when a noise signal changes over time and has several frequency components, as shown in FIG. 2, a transfer function based on an impulse response is applied to have an adaptive capability. After calculating and processing each frequency component by using DSP (Digital Signal Processor) chip, which is a hardware means that has a fast computing ability to process it in real time, the control signal is finally compensated and synthesized, and finally the control signal Will print

그러나, 종래 DSP 칩을 이용한 소음제어 장치는 DSP 칩이 마이컴과 병행되어 사용되고 있어 고가인 DSP 칩에 대한 가격 부담이 커다란 단점으로 부각되었으며, 이로 인하여 실용화에 있어서 상대적으로 가격이 낮은 가전제품에는 적용할 수가 없는 문제점이 있었다.However, the noise control device using a conventional DSP chip has been used as a microcomputer with a DSP chip, and thus the cost burden on the expensive DSP chip has emerged as a big disadvantage. There was a problem that can not be.

따라서, 본 발명의 목적은 상기한 종래 기술의 문제점을 해결하기 위해 제안한 것으로서, 비교적으로 DSP 칩에 비해 가격이 상당히 저렴한 범용 마이컴만을 이용하되 현재 제품에 이용되고 있는 범용 마이컴은 처리속도 및 연산 능력의 한계로 인하여 복수의 주파수 성분을 한꺼번에 분석 및 연산하지 못하므로 복잡한 연산과정 없이 단순히 소음신호와 제어신호 사이의 오차만을 각각의 주파수에 따라 보정해 주고, 이 각각의 주파수 성분별 제어신호들을 합성하여 제어용 스피커로 출력하도록 한 능동소음제어에서의 제어신호 합성 장치를 제공하는 데 있다.Accordingly, an object of the present invention has been proposed to solve the above-mentioned problems of the prior art, and only general-purpose microcomputers, which are relatively inexpensive compared to DSP chips, are used. Due to the limitation, multiple frequency components cannot be analyzed and computed at once, so it is possible to simply correct the error between the noise signal and the control signal according to each frequency without complicated calculation process, and to synthesize the control signals for each frequency component for control. An object of the present invention is to provide a control signal synthesizing apparatus in active noise control for outputting to a speaker.

상기 목적을 달성하기 위한 본 발명의 기술적 수단은, 소음원으로부터 소음신호를 검출하여 증폭 출력하는 검출수단과, 상기 검출수단에서 증폭된 소음신호에서 원하는 제어대상 주파수 성분의 소음신호를 필터링하는 복수의 대역통과필터와, 상기 복수의 대역통과필터에 의해 필터링한 복수의 소음신호를 필요한 데이터 형태로 변환하여 입출력하되 복수의 소음신호와 후단의 신호 합성기로 출력되는 제어신호 사이의 오차를 각각의 주파수에 따라 보정하는 제어수단과, 상기 제어수단에서 출력되는 복수의 소음신호를 각각 필터링하여 고주파 성분의 잡음을 제거하는 복수의 저역통과필터와, 상기 복수의 저역통과필터를 통해 출력된 복수의 소음신호를 합성하여 제공받아 소정의 가산 증폭기를 통해 동일한 진폭의 반전된 위상을 갖는 제어신호를 발생하는 신호 합성기, 및 상기 신호 합성기에서 출력된 제어신호를 증폭 출력하여 소음원을 상쇄시키는 출력수단을 구비하는 것을 특징으로 한다.Technical means of the present invention for achieving the above object is a detection means for detecting and amplifying and outputting a noise signal from the noise source, and a plurality of bands for filtering the noise signal of the desired control frequency component in the noise signal amplified by the detection means The noise between the pass filter and the plurality of noise signals filtered by the plurality of band pass filters are converted into necessary data types, and inputted and outputted according to the respective frequencies. Combining a control means for correction, a plurality of low pass filters for filtering out a plurality of noise signals output from the control means to remove noise of high frequency components, and a plurality of noise signals output through the plurality of low pass filters Receive a control signal having an inverted phase of the same amplitude through a predetermined adder And an output means for amplifying and outputting the generated signal synthesizer and the control signal output from the signal synthesizer to cancel the noise source.

도 1 은 일반적인 능동소음제어의 기본 원리도이고,1 is a basic principle diagram of a general active noise control,

도 2 는 종래 능동소음제어에서의 DSP 칩을 이용한 제어신호 합성장치를 나타낸 블록도이고,2 is a block diagram showing a control signal synthesizing apparatus using a DSP chip in conventional active noise control;

도 3 은 본 발명에 의한 능동소음제어에서의 제어신호 합성 장치를 나타낸 블록도이고,3 is a block diagram showing a control signal synthesizing apparatus in active noise control according to the present invention;

도 4 는 도 3 에 도시된 신호 합성기의 상세 회로를 나타낸 도면이다.4 is a diagram illustrating a detailed circuit of the signal synthesizer illustrated in FIG. 3.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

111 : 센서부 112 : 신호 증폭부111: sensor unit 112: signal amplification unit

113 : 대역통과필터 120 : 중앙 제어부113: band pass filter 120: central control

130 : 저역통과필터 140 : 신호 합성기130: low pass filter 140: signal synthesizer

141 : 연산 증폭기 151 : 전력 증폭부141: operational amplifier 151: power amplifier

152 : 출력부152: output unit

이하, 본 발명을 첨부한 도면에 의거하여 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

도 3 은 본 발명에 의한 능동소음제어에서의 제어신호 합성장치를 나타낸 블록도로서, 소음원으로부터 소음신호를 검출하는 센서부(111)와, 상기 센서부(111)에서 검출된 소음신호를 소정의 레벨로 증폭하여 출력하는 신호 증폭부(112)와, 상기 신호 증폭부(112)에서 증폭된 소음신호에서 원하는 제어대상 주파수 성분의 소음신호를 검출하는 복수의 대역통과필터(113)와, 상기 대역통과필터부(113)에 의해 검출된 복수의 소음신호를 A/D 변환기를 통해 입력받아 D/A 변환기를 통해 출력하되 복수의 소음신호와 후단의 신호 합성기(140)로 출력되는 제어신호 사이의 오차를 각각의 주파수에 따라 보정하는 중앙 제어부(120)와, 상기 중앙 제어부(120)가 출력하는 복수의 소음신호를 각각 필터링하여 고주파 성분의 잡음을 제거한 후 출력하는 복수의 저역통과필터(130)와, 잡음이 제거된 복수의 소음신호를 합성한 후 합성된 신호와 진폭은 같고 위상이 반전된 제어신호를 출력하는 신호 합성기(140)와, 상기 신호 합성기(140)를 통해 출력된 제어신호를 전력 증폭하여 출력하는 전력 증폭부(151)와, 상기 전력 증폭부(151)에서 증폭된 제어신호를 스피커를 통해 음의 형태로 출력하여 음장 공간을 발생시키는 출력부(152)로 구성되어 있다.3 is a block diagram showing an apparatus for synthesizing a control signal in active noise control according to the present invention, wherein the sensor unit 111 detects a noise signal from a noise source and a noise signal detected by the sensor unit 111 is determined. A signal amplifying unit 112 for amplifying and outputting the signal at a level, a plurality of band pass filters 113 for detecting a noise signal of a desired control frequency component from the noise signal amplified by the signal amplifying unit 112, and the band Receives a plurality of noise signals detected by the pass filter 113 through the A / D converter and outputs through the D / A converter, but between the plurality of noise signals and the control signal output to the signal synthesizer 140 of the rear stage Central control unit 120 for correcting the error according to each frequency, and a plurality of low-pass filter 130 for filtering the plurality of noise signals output by the central control unit 120 to remove the high-frequency components and then output And a signal synthesizer 140 for synthesizing a plurality of noise signals from which noise is removed and outputting a control signal having the same amplitude and inverted phase as the synthesized signal, and a control signal output through the signal synthesizer 140. A power amplifier 151 for amplifying and outputting, and an output unit 152 for generating a sound field space by outputting a control signal amplified by the power amplifier 151 in the form of a sound through a speaker.

도 4 는 도 3 에 도시된 신호 합성기의 회로를 나타낸 것으로서, 복수의 저역 통과필터(130)에 의해 고주파 성분이 제거된 복수의 소음신호를 입력받아 이 복수의 소음신호가 가산된 신호와 진폭은 같고 위상이 반전된 신호를 출력하기 위해 단위 이득(이득=1)을 갖는 연산 증폭기(141)로 구성되어져 있다(여기서, R1=R2=R3=…=Rf).FIG. 4 is a circuit diagram of the signal synthesizer shown in FIG. 3, wherein a plurality of noise signals from which high frequency components are removed by a plurality of low pass filters 130 are input, and the signals and amplitudes to which the plurality of noise signals are added are represented. It consists of an operational amplifier 141 having a unity gain (gain = 1) for outputting the same and inverted phase signal (where R1 = R2 = R3 = ... = Rf).

이와 같이 구성된 본 발명에 의한 능동소음제어에서의 제어신호 합성 장치의 동작을 첨부한 도면 도 3 및 도 4를 참조하여 설명하면 다음과 같다.The operation of the control signal synthesizing apparatus in the active noise control according to the present invention configured as described above will be described with reference to FIGS. 3 and 4.

먼저, 소음원으로부터 소음이 발생되어 센서부(111)에 의해 소음신호가 검출되면 검출된 소음신호는 신호 증폭부(112)에 의해 소정의 레벨로 증폭되어 복수의 대역통과필터(113)로 출력되게 된다.First, when noise is generated from a noise source and a noise signal is detected by the sensor unit 111, the detected noise signal is amplified to a predetermined level by the signal amplifier 112 and outputted to the plurality of band pass filters 113. do.

그리고, 복수의 대역통과필터(113)는 각각 입력신호를 필터링하여 원하는 제어대상 주파수 성분의 소음신호를 검출하게 된다. 즉, 예를 들어 120Hz, 240Hz, 360Hz의 주파수 성분을 가지고 있는 소음의 경우 1개의 대역통과필터(113)를 통하여 120Hz성분의 신호를 얻어내고, 또 하나의 대역통과필터(113)를 통하여 240Hz 성분의 신호를 얻어내며, 다른 하나의 대역통과필터(113)를 통하여 360Hz 성분의 신호를 얻어내게 된다.The plurality of band pass filters 113 respectively filter input signals to detect noise signals of desired control frequency components. That is, for example, in the case of noise having a frequency component of 120 Hz, 240 Hz, 360 Hz, a signal having a 120 Hz component is obtained through one band pass filter 113 and a 240 Hz component through another band pass filter 113. A signal of 360 Hz is obtained through the other band pass filter 113.

다음으로, 이렇게 검출된 복수의 소음신호는 중앙 제어부(120) 내의 A/D 변환기를 통해 디지털 신호로 변환되어 입력되고, 다시 중앙 제어부(120)내의 D/A 변환기를 통해 아날로그 신호로 변환되어 복수의 저역통과필터(130)로 각각 출력되게 된다.Next, the plurality of noise signals thus detected are converted into a digital signal through an A / D converter in the central control unit 120, and then converted into an analog signal through a D / A converter in the central control unit 120, thereby converting the plurality of noise signals into a plurality of noise signals. Are output to the low pass filter 130, respectively.

그리고, 복수의 소음신호를 입력받은 복수의 저역통과필터(130)는 입력된 각각의 소음신호를 필터링하여 고주파 성분의 잡음을 제거한 후 잡음이 제거된 복수의 소음신호를 신호 합성기(140)로 전달하게 된다. 여기서, 소음신호는 Vi=Aisin(

Figure pat00005
it-
Figure pat00006
i)이다(단, i는 1, 2, 3,..., n이고, A는 진폭이고,
Figure pat00007
는 2
Figure pat00008
f이고,
Figure pat00009
는 위상지연임).In addition, the plurality of low pass filters 130 receiving the plurality of noise signals filter each of the noise signals input to remove noise of high frequency components, and then transfer the plurality of noise signals from which the noise is removed to the signal synthesizer 140. Done. Here, the noise signal is Vi = Aisin (
Figure pat00005
it-
Figure pat00006
i), where i is 1, 2, 3, ..., n, A is amplitude,
Figure pat00007
Is 2
Figure pat00008
f,
Figure pat00009
Is the phase delay).

그러면, 내부 저항과 입력저항의 크기가 같은 반전 연산 증폭기로 이루어진 신호 합성기(140)는 복수의 소음신호를 합성한 후 합성된 신호와 진폭은 같고 위상이 반전된 제어신호를 발생시켜 출력하게 된다.Then, the signal synthesizer 140 composed of an inverted operational amplifier having the same magnitude of the internal resistance and the input resistance synthesizes a plurality of noise signals, and generates and outputs a control signal having the same amplitude as that of the synthesized signal and inverted phase.

이때, 도 4에 도시된 바와 같이 연산 증폭기(141)의 입력 단자는 가상 접지되어 있어 복수의 신호가 입력되어도 각 신호들 간에는 상호 간섭을 주지않게 되고, 입력신호의 수에 관계없이 상호 영향없이 합성하게 된다.In this case, as shown in FIG. 4, the input terminals of the operational amplifier 141 are virtually grounded, so that even if a plurality of signals are input, they do not interfere with each other, and are synthesized without mutual influence regardless of the number of input signals. Done.

그리고, 내부저항(Rf)과 입력저항(R1, R2, R3)의 크기가 모두 같아 연산 증폭기(141)가 단위 이득(이득=1)을 가지므로, 능동소음제어의 기본 개념인 진폭은 같고 위상이 반전된 제어신호가 출력하게 된다.Since the internal amplifier Rf and the input resistors R1, R2, and R3 have the same magnitude, the operational amplifier 141 has a unit gain (gain = 1), so that the amplitude, which is the basic concept of active noise control, is the same and is the phase. This inverted control signal is output.

즉, 신호 합성기(140)의 출력은 Vo=-(Rf×V1/R1+Rf×V2/R2+Rf×V3/R3+…)로 표현되는 데, 'Rf=R1=R2=R3'이면 최종 출력은 Vo=-(V1+V2+V3+…)가 된다(단, 부호 -는 위상이 반전된 것을 나타냄).That is, the output of the signal synthesizer 140 is represented by Vo = − (Rf × V1 / R1 + Rf × V2 / R2 + Rf × V3 / R3 +…), but the final output when 'Rf = R1 = R2 = R3'. Becomes Vo =-(V1 + V2 + V3 + ...) (where the sign-indicates that the phase is reversed).

다음으로, 이와 같이 신호 합성기(140)가 출력한 제어신호를 전력 증폭부(151)가 전력 증폭하게 되고, 증폭된 제어신호를 출력부(152)는 스피커를 통해 음의 형태로 출력하여 음장 곤간이 발생하게 된다.Next, the power amplification unit 151 power amplifies the control signal output from the signal synthesizer 140, and the output unit 152 outputs the amplified control signal in the form of sound through a speaker. The liver develops.

그러면, 소음신호와 제어신호가 같은 공간내에서 상호 중첩되므로 두 신호가 상쇄되어 소음이 제거되게 된다.Then, since the noise signal and the control signal overlap each other in the same space, the two signals are canceled to eliminate the noise.

한편, 중앙 제어부(120)는 복수의 대역통과필터(113)를 통해 검출된 소음신호와 신호 합성기(140)에 의해 발생되는 제어신호 사이의 오차를 각각의 주파수에 따라 보정하게 된다.Meanwhile, the central controller 120 corrects an error between the noise signal detected through the plurality of band pass filters 113 and the control signal generated by the signal synthesizer 140 according to each frequency.

따라서, 본 발명에서는 범용 마이컴만을 이용하여 복잡한 연산 과정없이 단순히 소음신호와 제어신호 사이의 오차만을 각각의 주파수에 따라 보정해 주고, 이 각각의 주파수 성분별 제어신호들을 합성한 후 제어용 스피커로 출력시켜 두 신호를 같은 공간내에서 상호 중첩되게하여 소음을 제거함으로써, 장치의 코스트가 저감되어 실용성이 향상되는 효과가 있다.Therefore, the present invention simply corrects the error between the noise signal and the control signal according to each frequency without complex calculation process using only the general purpose microcom, and synthesizes the control signals for each frequency component and outputs them to the control speaker. By removing the noise by overlapping the two signals in the same space, there is an effect that the cost of the device is reduced to improve the practicality.

Claims (2)

소음원을 검출하여 제거하는 소음제거 시스템에 있어서,In the noise reduction system for detecting and removing the noise source, 검출한 소음원 중 원하는 제어대상 주파수 성분의 소음신호를 필터링하는 복수의 대역통과필터;A plurality of band pass filters for filtering out noise signals of desired frequency components to be controlled among the detected noise sources; 상기 복수의 대역통과필터에 의해 필터링한 복수의 소음신호를 필요한 데이터 형태로 변환하여 입출력하되 복수의 소음신호와 소정의 신호 합성부로 출력하는 제어신호 사이의 오차를 각각의 주파수에 따라 보정하는 제어수단;Control means for converting a plurality of noise signals filtered by the plurality of band pass filters into the required data format to input and output, and to correct the error between the plurality of noise signals and the control signal output to a predetermined signal synthesizer according to each frequency ; 상기 제어수단에서 출력되는 복수의 소음신호를 각각 필터링하여 고주파 성분의 잡음을 제거하는 복수의 저역통과필터;A plurality of low pass filters for filtering out a plurality of noise signals output from the control means to remove noise of high frequency components; 상기 복수의 저역통과필터를 통해 출력된 복수의 소음신호를 합성하여 제공받아 소정의 가산 증폭기를 통해 동일한 진폭의 반전된 위상을 갖는 제어신호를 발생하는 신호 합성부; 및A signal synthesizer configured to synthesize a plurality of noise signals output through the plurality of low pass filters and generate a control signal having an inverted phase having the same amplitude through a predetermined adder amplifier; And 상기 신호 합성부에서 출력된 제어신호를 증폭 출력하여 소음원을 상쇄시키는 출력수단을 구비하는 것을 특징으로 하는 능동소음제어에서의 제어신호 합성 장치.And an output unit for amplifying and outputting a control signal output from the signal synthesizing unit to cancel a noise source. 제 1 항에 있어서,The method of claim 1, 상기 신호 합성부의 가산 증폭기는,The adder of the signal synthesis unit, 내부저항과 입력저항의 크기가 같은 단위 이득의 연산 증폭기로 구성되는 것을 특징으로 하는 능동소음제어에서의 제어신호 합성 장치.An apparatus for synthesizing control signals in active noise control, comprising an operational amplifier having a unity gain having the same internal resistance and an input resistance.
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