KR20110064641A - Noise reducing apparatus - Google Patents

Abstract

PURPOSE: A device for reducing noise is provided to efficiently reduce and block noise from a noise source. CONSTITUTION: A device for reducing noise comprises an information acquisition unit(110), a signal processing unit(120), an offset signal ejector(130), a support, a first speaker, and a second speaker. The information acquisition unit comprises a noise gathering unit collecting the noise from the noise source. The information acquisition unit senses noise source and collects the noise from the noise source. The signal processing unit filters the noise collected by the information acquisition unit in order to the extract the noise of specific frequency range. The offset signal ejector locates according to the movement route of the noise source. The support is extended from a plurality of offset signal ejectors in a cross direction of on the ground. The first speaker is supported with the support and transmits offsetting signals generated from the signal processing unit. The second speaker is supported with the support on the location higher than the first speaker and transmits offsetting signals generated from the signal processing unit.

Description

Noise reduction device {NOISE REDUCING APPARATUS}

The present invention relates to a noise reduction device, and more particularly to a noise reduction device that can reduce the noise generated from the noise source.

In general, a noise barrier having a predetermined height is used to prevent noise generated from a vehicle traveling on a road, a train running on a track, and the like transmitted to a residential area. The noise barrier is continuously installed around a road or a track to passively block noise generated from a vehicle or a train so that the noise cannot be transmitted to a residential area.

However, these sound barriers not only harm the urban aesthetics, but also impede airflow. In addition, the sound barrier can not block the noise of the relatively low frequency, there is a problem that the cost of installing the sound barrier is expensive.

Accordingly, the technical problem of the present invention has been made in view of this point, and an object of the present invention is to provide a noise reduction device that can effectively reduce noise.

Noise reduction device according to an embodiment of the present invention includes an information collection device, a signal processing device and a plurality of offset signal emitting device. The information collecting device collects the noise generated from the noise source. The signal processing apparatus filters the noise collected by the noise collector to extract noise in a specific frequency range, and generates an offset signal for canceling the extracted noise. The plurality of offset signal radiating devices emits the offset signals generated by the signal processing device. At least one of the plurality of offset signal radiating apparatuses may include a support, a first speaker, and a second speaker. The support extends in a direction perpendicular to the ground. The first speaker is supported by the support and rotates left and right relative to the support, and radiates the offset signal generated by the signal processing device toward the movement path of the noise source. The second speaker is supported at a position higher than the first speaker by the support, moves up and down along the support, and emits the cancellation signal generated by the signal processing device.

The support may include a support and a first motor. The support extends in a direction perpendicular to the ground. The first motor is coupled to the first height of the support, and performs the left and right rotational movement along the circumference of the support. The first speaker may be coupled to the second motor. The support may include an upper cross section parallel to the ground, a side perpendicular to the ground, and a connection surface connecting the upper cross section and the side, wherein the support further includes a second motor, a third motor, and a rotating belt. can do. The second motor is fixed to the upper cross section of the support. The third motor is fixed to the side of the support. The rotating belt is coupled to the second motor and the third motor to rotate along the side surface, the connection surface, and the upper cross section of the support, and to couple with the second speaker.

The noise reduction device may further include a control device connected to the information collecting device, the continuous signal processing device, and the plurality of offset signal radiating devices. The plurality of offset signal radiators may include first offset signal radiators including a plurality of first offset signal radiators arranged in a line along a moving path of the noise source from a point spaced apart from the information collection device by a first interval. Device group; And a second offset signal radiator comprising a plurality of second offset signal radiators arranged in a line along a movement path of the noise source from a point spaced apart from the first offset signal radiation field group by a second interval in the direction of movement of the noise source. It may include a device group. In this case, the controller may individually control a time period during which the first offset signal radiator group and the second offset signal radiator group emit the offset signal.

According to such a noise reduction device, it is possible to effectively remove the noise generated from the noise source.

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

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are shown to be enlarged or reduced than actual for clarity of the invention. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise.

In this application, the terms "comprise" or "include" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, one or more other It is not intended to exclude the presence or possibility of adding features, numbers, steps, actions, components, parts, or combinations thereof. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

1 is a perspective view for explaining a noise reduction device according to a first embodiment of the present invention, Figure 2 is a block diagram for explaining an embodiment of the noise reduction device shown in Figure 1, Figure 3 is a filter unit Is a waveform diagram showing the noise signal filtered by the signal and the cancel signal corresponding thereto.

1 and 2, the noise reduction apparatus 100 includes an information collecting device 110, a signal processing device 120, and a plurality of offset signal radiating devices 130 and 140.

The information collecting device 110 includes a noise collecting unit 11 and a speed measuring unit 113. The noise collector 111 collects noise generated from the noise source 10 moving along the movement path 20, and the speed measuring unit 113 measures the movement speed of the noise source 10. In order to collect the noise from the noise source 10 and to measure the moving speed of the noise source 10, the information collecting device 110 is located adjacent to the movement path 20 of the noise source 10. On the contrary, the information collecting device 110 may be located above the movement path 20 of the noise source 10 using a separate structure. For example, the information collecting device 110 may be installed in an overpass crossing the upper portion of the moving path 20 of the noise source 10, a structure for installing traffic signs, a structure for installing a camera for collecting traffic information, and the like. .

In the present embodiment, the noise collector 111 may include a microphone (not shown) for collecting the noise generated from the noise source 10. In addition, the information collecting device 110 may further include a sensor (not shown) for detecting the noise source 10. For example, when the noise source 10 is detected by the sensor, the speed measuring unit 113 measures the moving speed of the noise source 10, and the noise collecting unit 111 detects the noise generated from the noise source 10. To collect.

The signal processing apparatus 120 filters the noise collected by the noise collector 111 to extract noise in a specific frequency range, and generates an offset signal for canceling the extracted noise. To this end, the signal processing device 120 may include a filter 121 and a cancellation signal generator 123.

The filter unit 121 may include a band pass filter for filtering the noise signal received from the information collecting device 110. The bandpass filter preferably passes a noise signal in the human audible frequency range. That is, the filter unit 121 is preferably about 63 Hz or more, it is preferably composed of a band pass filter for passing a noise signal in the range of about 8 KHz or less.

The offset signal generator 123 receives the filtered noise signal from the filter unit 121 and generates an offset signal having a phase opposite thereto. The cancellation signal has the same frequency and magnitude as the filtered noise signal as shown in FIG. 3, and is about 180 Hz out of phase. Therefore, the cancellation signal may interfere with the extracted noise signal, thereby canceling the extracted noise signal.

When it is desired to generate an offset signal corresponding to the noise signal of the entire frequency range, it takes a long time to receive the noise signal and generate the offset signal, and thus it is not possible to efficiently remove the noise generated from the noise source 10. In addition, even if only the noise signal belonging to the human audible range is removed, the degree of noise felt by the human being is similar to the case of canceling the noise signal of the entire frequency range. Therefore, in the present invention, in order to shorten the time taken to generate the offset signal, the noise signal belonging to the human audible frequency range is extracted and the offset signal corresponding thereto is generated.

The plurality of offset signal radiating devices 130 and 140 radiate the offset signals generated by the signal processing device 120 toward the moving path 20 of the noise source 10 to remove noise generated from the noise source 10. .

The plurality of offset signal emitters 130 and 140 may include a first offset signal emitter group 130 and a second offset signal emitter group 140. The first offset signal radiator group 130 radiates a plurality of first offset signal radiators arranged in a line along the movement path 20 of the noise source 10 from a point spaced apart from the information collection device 110 by a predetermined distance L1. And the second offset signal emitter group 140 is a movement path 20 of the noise source 10 from a point spaced apart from the first offset signal emitter group 130 by a predetermined distance L2. It may be composed of a plurality of second offset signal emitters 140 arranged in a line along the.

4 is a cross-sectional view illustrating one of the offset signal radiating apparatuses shown in FIG. 1.

1 and 4, at least one of the plurality of offset signal emitters 130 and 140, for example, a first offset signal emitter of one of the first offset signal emitter groups 130. 130 may include a support 133, a first speaker 131a, and a second speaker 131b.

The support 133 extends in a direction perpendicular to the ground. For example, the support 133 may include a support 134, a first motor 135, a second motor 136a, a third motor 136b, and a rotating belt 137.

The support 134 extends in a direction perpendicular to the ground, and connects an upper end surface 134a parallel to the ground, a side surface 134b perpendicular to the ground, and a connecting surface 134c connecting the upper end surface 134a and the side surface 134b. ) May be included. The connection surface 134c may have a flat or curved surface connecting the upper end surface 134a and the side surface 134b. In addition, a lower portion of the support 134 may have a cylindrical shape, and the side surface 134b, the connection surface 134c, and the upper end surface 134a may be formed on the support 134.

 The first motor 131a is coupled to the first height of the support 134 and rotates left and right along the circumference of the support 134. For example, the first height portion of the support 134 to which the first motor 131a is coupled may be a portion having a cylindrical shape.

The second motor 136a is fixed to the upper end surface 134a of the support 134, and the third motor 136b is fixed to the side surface 134b of the support 134. The rotating belt 137 is coupled to the second motor 136a and the third motor 136b. Therefore, when the second and third motors 136a and 136b rotate in the vertical direction, the rotation belt 137 coupled to the second and third motors 136a and 136b may have the side surface 134b of the support 134. Up and down rotation along the connecting surface 134c and the upper end surface 134a. In order to reduce friction between the rotating belt 137 and the support 134, the support 133 may further include fourth and fifth motors 136c and 136d. For example, the support 133 is connected to the fourth motor 136c and the side surface 134b of the support 134 fixed to the boundary between the upper end surface 134a of the support 134 and the connection surface 134c. It may further include a fifth motor 136d fixed to the boundary between 134c. That is, the fourth and fifth motors 136c and 136d are coupled to the rotating belt 137 between the second and third motors 136a and 136b. In this case, the rotating belt 137 rotates the side surface 134b, the connection surface 134c, and the upper end surface 134a of the support 134 as the first to fourth motors 136a, 136b, 136c, and 136d rotate. As a result of the vertical rotation, the rotation belt 137 and the support 134 can be prevented from contacting.

The first speaker 131a radiates the offset signal generated by the signal processing device 120 toward the movement path 20 of the noise source 10. To this end, the first speaker 131a may be coupled to the first motor 135. Therefore, as the first motor 135 moves left and right along the circumference of the support 134, the first speaker 131a coupled thereto also moves left and right. For example, the first speaker 131a preferably rotates left and right within an angle range of about 0 degrees to about 180 degrees based on the movement path 20 of the noise source 10. That is, since the first speaker 131a may radiate an offset signal while rotating the left and right, the first speaker 131a may not only radiate the offset signal along the moving noise source 10 but also effectively cancel the noise generated in various directions. Can be.

The second speaker 131b also radiates the offset signal generated by the signal processing device 120 toward the movement path 20 of the noise source 10. The second speaker 131b may be coupled to the rotating belt 137. Thus, as the rotating belt 137 moves up and down along the side surface 134b, the connecting surface 134c and the upper end surface 134a of the support 134, the second speaker 13 mu coupled thereto is supported by The vertical movement is performed along the side surface 134b, the connection surface 134c, and the upper end surface 134a of the 134. The second speaker 131b, which moves up and down along the side surface 134b, the connection surface 134c, and the upper end surface 134a of the support 134, is directed upward as well as toward the movement path 20 of the noise source 10. The cancellation signal can be emitted. That is, the second speaker 131b may cancel not only the noise propagated toward the upper end of the support 133 but also the diffracted noise.

Hereinafter, referring to FIGS. 1 and 2, an arrangement of offset signal radiating apparatuses and a driving method thereof will be described.

The plurality of offset signal emitters 130 and 140 may include a first offset signal emitter group 130 and a second offset signal emitter group 140.

The first offset signal radiating device group 130 includes a plurality of first offset signal radiating devices arranged in a line along a moving path of the noise source 10 from a point spaced apart from the information collecting device 110 by a predetermined distance L1. It consists of 130. The second offset signal emitter group 140 is a movement path 20 of the noise source 10 from a point spaced apart from the first offset signal emitter group 130 by a predetermined distance L2 in the direction of movement of the noise source 10. A plurality of second offset signal emitters 140 arranged in a line along the.

The noise reduction apparatus 100 according to the exemplary embodiment of the present invention further includes a controller 150 for individually controlling the first offset signal radiator group 130 and the second offset signal radiator group 140.

The control device 150 is based on the moving speed of the noise source 10 and the separation distance between the information collecting device 110 and the offset signal emitter 130, the first and second offset signal emitter group (130, 140) The time at which the offset signal starts to be emitted and the time at which the offset signal is terminated are controlled.

In one embodiment, the control device 150 is connected to the information collecting device 110 and the signal processing device 120, 'the moving speed of the noise source 10', 'the information collecting device 110 and the first cancellation signal The distance L1 between the start point of the radiator group 130 ', the distance W1 at which the first offset signal radiator group 130 is arranged, and the second offset signal radiator group 140 Based on the arranged distance W2 ', etc., the time at which the signal processing device 120 transmits the cancellation signal to the first cancellation signal radiating device group 130 and the signal processing device 120 cancels the cancellation signal by the second cancellation The transmission time to the signal radiating device group 140 may be controlled.

For example, the control device 140 may include a pre-stored distance L1 between the information collecting device 110 and the start point of the first offset signal emitter group 130 and the first offset signal emitter group. On the basis of the information on the distance W1 ′ in which the 130 is arranged and the information on the moving speed of the noise source 10 provided from the speed measuring unit 113, the noise source 10 includes the first offset signal radiating device group ( The time to reach 130 and the time to pass through the same may be calculated, and based on this, the time for the signal processing apparatus 120 to transmit the cancel signal to the first offset signal radiator group 130 may be determined. In addition, the control device 140 is a pre-stored 'distance distance (L2) from the first offset signal emitter group 130 to the point where the second offset signal emitter group 140 starts,' the 'second offset signal On the basis of the information on the arrangement distance W2 'of the radiator group 140 and the information on the moving speed of the noise source 10 provided from the speed measuring unit 113, the noise source 10 generates a second offset signal radiating device. The time for reaching the group and the time for passing the group may be calculated, and the time for the signal processing device 120 to transmit the cancel signal to the second cancel signal emitter group 140 may be determined based on the time. By such a control device 150, it is possible to effectively remove the noise generated from the noise source 10.

In contrast, the control device 140 is connected to the information collecting device 110 and the first and second offset signal emitter groups 130 and 140, and the previously stored information collecting device 110 and the first offset signal radiation. The separation distance L1 to the start point of the device group 130, the arrangement distance W1 of the first offset signal emitter group 130, and the arrangement distance W2 of the second offset signal emitter group 140. The first and second canceling signal radiating device groups 130 and 140 received from the signal processing device 120 based on the information about the moving speed of the noise source 10 provided from the information and the speed measuring unit 113. The time for radiating the offset signal toward the movement path 20 of the noise source 10 may be controlled.

Noise reduction device 100 according to an embodiment of the present invention may further include an analog-to-digital converter (not shown), a digital-to-analog converter (not shown) and an amplifier (not shown). The analog-to-digital converter is connected to the information collecting device 110 and the signal processing device 120, and converts the analog noise signal collected from the microphone of the information collecting device 110 into a digital signal to filter the signal processing device 120. It is provided to the part 121. The digital-to-analog converter is connected to the signal processing device 120 and converts the digital cancellation signal generated by the signal processing device 120 into a sound wave that is an analog signal. The amplifier is connected to the digital-to-analog converter and the first and second offset signal emitters 130 and 140 and amplifies the sound waves output from the digital-analog converter to convert the amplified sound waves into the offset signal emitter groups 130,. 140).

Noise reduction device according to embodiments of the present invention can actively control the noise generated from the noise source.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art or those skilled in the art without departing from the spirit and scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made within the scope of the invention.

1 is a perspective view for explaining a noise reduction device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating an embodiment of the noise reduction apparatus shown in FIG. 1.

FIG. 3 is a waveform diagram illustrating a noise signal filtered by the filter unit illustrated in FIG. 2 and an offset signal corresponding thereto.

4 is a cross-sectional view illustrating one of the offset signal radiating apparatuses shown in FIG. 1.

<Explanation of symbols for the main parts of the drawings>

100: noise reduction device 110: information collection device

120: signal processing apparatus 130: first offset signal radiating device group

140: second offset signal emitting device group

150: controller

Claims (5)

An information collection device including a noise collector configured to collect noise generated from a noise source; A signal processing device for filtering the noise collected by the noise collector to extract noise of a specific frequency range and generating an offset signal for canceling the extracted noise; And A plurality of offset signal radiating devices for radiating the cancel signal generated by the signal processing device; At least one of the plurality of offset signal radiating device includes a support extending in a direction perpendicular to the ground; A first speaker supported by the support and rotating left and right with respect to the support and emitting the offset signal generated by the signal processing device; And a second speaker supported by the support at a position higher than the first speaker, vertically moving along the support, and radiating the cancel signal generated by the signal processing device. The method of claim 1, wherein the support is A support extending in a direction perpendicular to the ground; And A first motor coupled to the first height of the support and rotating the left and right along the circumference of the support; And the first speaker is coupled to the second motor. According to claim 2, wherein the support comprises a top surface parallel to the ground, a side perpendicular to the ground and the connection surface connecting the upper cross-section and the side, The support is A second motor fixed to the upper cross section of the support; A third motor fixed to the side of the support; And Noise reduction further comprises a rotating belt coupled to the second motor and the third motor to rotate along the side surface, the connection surface and the upper cross-section of the support, the second speaker is coupled to the second motor; Device. The method of claim 3, wherein the support is A fourth motor fixed to a boundary between the upper end surface of the support and the connection surface of the support; And A fifth motor fixed to a boundary between the side surface of the support and the connection surface of the support, The fourth motor and the fifth motor is noise reduction device, characterized in that coupled to the rotating belt. The apparatus of claim 1, further comprising a control device connected to the information collecting device, the continuous signal processing device, and the plurality of offset signal radiating devices. The plurality of offset signal radiators A first offset signal radiator group consisting of a plurality of first offset signal radiators arranged in a line along a moving path of the noise source from a point spaced apart from the information collection device by a first interval; And A second offset signal radiation comprising a plurality of second offset signal radiators arranged in a line along the movement path of the noise source from a point spaced apart from the first offset signal radiator group by a second interval in the direction of movement of the noise source Includes device groups, And the control device individually controls a time period during which the first offset signal radiator group and the second offset signal radiator group emit the offset signal.

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