CN112669808A - Active noise control window for target tracking and control method thereof - Google Patents
Active noise control window for target tracking and control method thereof Download PDFInfo
- Publication number
- CN112669808A CN112669808A CN202011643678.3A CN202011643678A CN112669808A CN 112669808 A CN112669808 A CN 112669808A CN 202011643678 A CN202011643678 A CN 202011643678A CN 112669808 A CN112669808 A CN 112669808A
- Authority
- CN
- China
- Prior art keywords
- noise reduction
- metal
- noise
- controller
- microphone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 96
- 230000009467 reduction Effects 0.000 claims description 154
- 230000000694 effects Effects 0.000 claims description 52
- 230000009471 action Effects 0.000 claims description 6
- 235000012431 wafers Nutrition 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000009423 ventilation Methods 0.000 description 6
- 238000012549 training Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses an active noise control window for target tracking, which comprises a window body, a noise control window and a noise control window, wherein the window body is provided with a plurality of windows; the metal window frame structure is formed by combining a metal round pipe (4) and a metal square pipe (5), a motor (11) is mounted at the top end of the metal round pipe (4), the motor (11) rotates to drive a metal wafer (12) to rotate, the metal wafer (12) is welded and fixed with the metal round pipe (4), and the metal round pipe (4) is driven to rotate left and right to any angle by the rotation of the motor (11); the active noise control system includes: the system comprises a plurality of reference microphones (8), a plurality of secondary loudspeakers (9), a plurality of physical error microphones (7), a camera (3), a motor driver and a controller (6), wherein the input port of the controller is connected with the data signal lines of the reference microphones (8), the physical error microphones (7) and the camera (3), and the output port of the controller is connected with the data signal lines of the secondary loudspeakers (9) and the motor driver. A corresponding control method is also disclosed.
Description
Technical Field
The invention belongs to the field of active noise control, and particularly relates to an active noise control window for target tracking and a control method thereof.
Background
Noise has adverse effects on daily life, study, work and the like of people, and the noise problem is more and more concerned by people. The main methods for processing noise at present are passive noise reduction and active noise reduction, wherein the passive noise reduction mainly uses sound absorption cotton or other sound insulation devices to generate friction or viscous actions between sound waves and materials, so that noise energy is weakened, or noise is blocked as much as possible to reduce noise heard by human ears; the active noise reduction is to artificially provide a sound wave with the same amplitude and the opposite phase as the noise sound wave, and to superpose the sound wave with the original noise sound wave so as to achieve the purpose of eliminating the noise. Passive noise reduction is not good for low-frequency noise effect and is limited by material selection, application occasions, noise reduction effect and the like, and active noise reduction technology is more and more favored by people by virtue of the noise reduction range of a wider frequency band, a better noise reduction effect, a more flexible application scene and the like. The active noise reduction technology is widely used in the aspects of noise reduction inside an automobile car, noise reduction of an earphone and the like, and plays an important role in noise control.
With the acceleration of urban development and the continuous improvement of living standard of people, residential houses and office buildings are interfered by more and more noises, which are mainly derived from traffic noise, industrial noise, entertainment noise and the like. The number of high-rise buildings is increasing, and the traffic noise caused by urban road development is becoming the most harmful and numerous noise source in cities. Most of traditional building noise reduction methods are passive noise reduction methods, such as increasing the thickness of an outer wall of a house or laying a sound absorption and insulation device and the like to improve the noise reduction effect, but a window is also a main path for noise to enter a room when being used as a ventilation and lighting device. When the window is closed, the indoor air cannot be ventilated, and the indoor air quality is seriously reduced after the window is closed for a long time; and when the window is completely opened, outdoor noise cannot be blocked and directly enters, so that indoor noise is obviously increased. At present, most of windows with sound insulation effects are formed by two or three layers of windows, and the windows only have good sound insulation effect when being completely closed, and cannot play a role in blocking noise when being completely opened; and the window that has the ventilation function of making an uproar of falling mostly only leaves the vent above the window, still does not have noise reduction effect when the window is opened completely. At present, a window which can actively reduce noise under the condition of complete opening and has a good noise reduction effect on each indoor area is not available, so that the indoor ventilation can be realized, and the noise transmitted outdoors can be reduced.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an active noise control window for target tracking and a control method thereof, which can reduce noise transmitted from the outside to the inside of a room while achieving indoor ventilation, and can adjust the directions of a secondary speaker and a microphone in time when the activity area of people in the room changes, so as to optimize the noise reduction effect in the activity area of people.
The invention provides an active noise control window for target tracking, which comprises a window body, a noise control window and a noise control window, wherein the window body is provided with a plurality of windows;
the metal window frame structure is formed by combining a metal round pipe (4) and a metal square pipe (5), wherein the metal square pipe (5) is transversely arranged to play a role in fixing and supporting the metal round pipe (4), the metal round pipe (4) is vertically arranged and penetrates into the metal square pipe (5), the metal round pipes (4) on two sides of the metal window frame are welded and fixed with the metal square pipe (5), and the metal round pipe (4) in the middle is not fixed with the metal square pipe (5), so that the metal round pipe (4) can freely rotate; except for the fact that part of the metal round pipe (4) is welded and fixed with the metal square pipe (5), the top ends of the other metal round pipes (4) are provided with motors (11), the motors (11) rotate to drive metal wafers (12) to rotate, the metal wafers (12) are welded and fixed with the metal round pipes (4), and the rotation of the motors (11) drives the metal round pipes (4) to rotate left and right and can rotate to any angle; the metal window frame is internally provided with a wiring groove and a wiring hole, so that the normal placement of an active noise control system line and the attractiveness of the device are guaranteed, the top end and the bottom end of the window frame are respectively provided with a fixing device, and the fixing devices are used for fixing the metal window frame at a building window to guarantee the anti-theft and protection performance.
Preferably, the active noise control system includes:
the reference microphones (8) are embedded in the metal circular tube (4) and used for collecting original noise signals, and data lines and power lines matched with the reference microphones (8) are placed in the metal window frame;
the secondary loudspeakers (9) are embedded in the metal circular tube (4) and back to the reference microphone (8) and used for sending anti-noise signals so as to reduce noise of an indoor space, and data lines and power lines matched with the secondary loudspeakers (9) are arranged in the metal window frame;
the plurality of physical error microphones (7) are fixed on the metal circular tube (4), are arranged at the positions opposite to the secondary loudspeakers (9), are used for reducing noise of an indoor area by combining a virtual microphone technology under the condition that a microphone does not need to be arranged indoors, do not influence normal activities of indoor personnel and save space resources, and data lines and power lines matched with the physical error microphones (7) are also arranged in the metal window frame;
a camera (3) which is placed at the higher position of the roof or the wall surface of the room and is used for capturing the position of the head of a user in the room and locking the noise reduction area, so that the controller controls the action of the motor in real time to automatically adjust the orientation of a secondary loudspeaker (9) and a reference microphone (8) in the metal circular tube (4);
a motor driver and controller (6), wherein the motor driver is used for receiving the motor control signal and driving the motor (11) to complete the designated action; the controller and the motor driver are placed in a box body and fixed on a wall surface, an input port of the controller is connected with data signal lines of the reference microphone (8), the physical error microphone (7) and the camera (3), an output port of the controller is connected with data signal lines of the secondary loudspeaker (9) and the motor driver, and the physical error microphone (7) is placed in a physical error microphone frame (10).
Preferably, the metal round tube (4) of the window frame can rotate continuously, and the rotating speed and direction of the metal round tube are determined by the action of a motor (11) at the top end of the metal round tube (4).
Preferably, the reference microphone (8), the secondary speaker (9) and the physical error microphone (7) are all fixed on the metal round tube (4) and can rotate along with the rotation of the metal round tube (4), so that the reference microphone, the secondary speaker and the physical error microphone can face any direction.
Preferably, a driving signal of the motor (11) is generated by a controller and is connected to a motor driver through an output port, the starting, stopping, rotating direction and speed of the motor (11) are controlled by the driving signal, the driving signal can be automatically changed by the controller in real time according to the noise reduction requirement, the driving signal controls the motor (11) to rotate to drive the metal circular tube (4) to rotate, and finally, each secondary loudspeaker (9), the reference microphone (8) and the physical error microphone (7) are all directed to an ideal direction, namely the direction of the head of a user.
Preferably, the orientation of the rotatable metal round tube (4) is determined by the position of the indoor personnel tracked by the camera (3), and the controller drives the motor to rotate after the position is locked, so that the secondary loudspeaker (9) in the metal round tube (4) faces to the area needing noise reduction.
The invention also aims to disclose an active noise control method based on the active noise control window, which comprises the following steps:
step 1: determining a noise reduction area;
step 2: calculating an auxiliary filter and a secondary path model;
and step 3: and performing active noise control according to the auxiliary filter and the secondary path model.
Preferably, the step 1 comprises:
and step 13, placing the room pictures captured by the camera (3) in real time in a coordinate system, wherein each noise reduction area is fixed in a determined coordinate range.
Preferably, the step 2 comprises:
step 21, setting a plurality of noise reduction points in a noise reduction area according to the noise reduction requirement;
step 22, sequentially placing virtual microphones (1) at noise reduction points of the noise reduction area, enabling a secondary loudspeaker (9), a reference microphone (8) and a physical error microphone (7) to point to the noise reduction area, calculating controller parameters which enable each virtual microphone (1) in the noise reduction area to have a good noise reduction effect by using an FxLMS algorithm, and then calculating an auxiliary filter containing controller parameter information by using an LMS algorithm;
step 23, under the condition that the positions of the secondary loudspeaker (9), the reference microphone (8) and the physical error microphone (7) are not changed, modeling an acoustic path between the secondary loudspeaker (9) and the physical error microphone (7) and obtaining corresponding model parameters;
and 24, repeating the step 21 for each noise reduction area, setting noise reduction points in each noise reduction area, changing the orientation of the secondary loudspeaker (9), the reference microphone (8) and the physical error microphone (7) so that the secondary loudspeaker (9), the reference microphone (8) and the physical error microphone (7) are just opposite to the noise reduction area, repeating the step 22 and the step 23 to obtain an auxiliary filter coefficient and a secondary path model corresponding to each noise reduction area, and removing all the virtual microphones (1).
Preferably, the step 3 includes:
step 31, storing the auxiliary filter coefficient and the physical secondary path model corresponding to each noise reduction area in a controller, and calling the auxiliary filter parameter and the physical secondary path model corresponding to the noise reduction area by the controller after the camera (3) and the controller lock the noise reduction area, and then performing active noise control;
step 32, after the controller obtains a noise reduction area tracked by the camera (3), calculating and generating a driving signal for controlling a motor (11) at the top end of the metal circular tube (4), and enabling each secondary loudspeaker (9) to be over against the noise reduction area by the rotation of the motor (11);
and step 33, starting an active noise reduction function, receiving a noise signal and an error signal in real time by the reference microphone (8) and the physical error microphone (7), transmitting the noise signal and the error signal to the controller, capturing the activity range of indoor personnel in real time by the camera (3) and locking a noise reduction area, generating a motor driving signal and a secondary loudspeaker driving signal by the controller, enabling the secondary loudspeaker (9) to turn to the area needing noise reduction, sending an anti-noise sound wave signal with the same amplitude and opposite phase as the noise sound wave, and superposing the noise sound wave and the anti-noise sound wave of the target noise reduction area to achieve the effect of noise reduction.
The invention has the beneficial effects that:
1) be applied to the window with initiative noise control technique, initiative noise control system fixes in the metal window frame, installs in the glass window 2 outside, and the structure that does not influence initiative noise control system is opened and is closed to glass window 2, and when glass window 2 was opened completely, still can open the function of making an uproar of falling of window, reduces the external noise that spreads into indoor, guarantees that indoor ventilation and fall and can go on simultaneously with making an uproar. Meanwhile, the structure also plays a role of a metal anti-theft window.
2) The noise reduction effect of the active noise control system is greatly related to the spatial layout and the placement position of the reference microphone 8, the physical error microphone 7 and the secondary loudspeaker 9, the fixed secondary loudspeaker 9 has a good noise reduction effect in the region opposite to the secondary loudspeaker 9, and the noise reduction effect in the side region of the secondary loudspeaker 9 is far less than that in the region opposite to the secondary loudspeaker 9. The active noise control system that fixes the secondary speaker 9 cannot guarantee that the optimal noise reduction effect is maintained for each directional region. The window structure is internally provided with the motor 11, the motor 11 rotates to drive the reference microphone 8, the physical error microphone 7 and the secondary loudspeaker 9 to rotate, and the secondary loudspeaker 9 is ensured to be always right opposite to a region needing noise reduction, so that a user region always has the best noise reduction effect;
3) the window adopts a multi-channel active noise control technology, compared with a single channel, the window has a larger noise reduction range and a better noise reduction effect, and the number of channels can be selected randomly according to the noise reduction requirement;
4) the common active noise control system places error microphones at target noise reduction points, the target noise reduction points of the active noise control window are in an indoor area, if the error microphones are placed indoors, normal activities of indoor personnel are influenced, and space resources are occupied. The invention utilizes the virtual microphone technology, does not need to arrange an error microphone indoors, does not influence the activity of personnel and saves indoor space, and meanwhile, the coefficient of the controller is adaptively updated in real time, thereby being suitable for the noise which moves and changes like traffic noise.
Drawings
Fig. 1(a) and (b) are schematic diagrams illustrating an arrangement and a structure of a virtual microphone and an active noise control window according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a metal pipe of an active noise control window according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a motor in a metal round tube according to an embodiment of the invention.
Fig. 4 is a schematic diagram of a process for performing active noise reduction control according to an embodiment of the present invention.
Fig. 5 is a diagram of the noise reduction effect at a point a just opposite to a point a of the secondary speaker according to an embodiment of the present invention.
Fig. 6 is a diagram of the noise reduction effect at point B directly opposite to point a of the secondary speaker according to the embodiment of the present invention.
Fig. 7 is a diagram of the noise reduction effect at point B directly opposite to point B of the secondary speaker according to the embodiment of the present invention.
Fig. 8 is a diagram of the noise reduction effect at a point a directly opposite to a point B of the secondary speaker according to the embodiment of the present invention.
In the figure, 1-virtual microphone, 2-glass window, 3-camera, 4-metal round tube, 5-metal square tube, 6-controller and motor driver, 7-physical error microphone, 8-reference microphone, 9-secondary loudspeaker, 10-physical error microphone frame, 11-motor, 12-metal wafer.
Detailed Description
To more clearly describe the embodiments and advantages of the present invention, the present invention will be further described with reference to the accompanying drawings and detailed description.
In practical application, the active noise control technology can be divided into single-channel control and multi-channel control according to the number of used channels; and the method can also be divided into local active noise control and global active noise control according to the range of the actual noise reduction area. The noise reduction in the room belongs to global noise reduction, and the noise reduction range of multi-channel active noise control is larger, so that the window with the active noise reduction function is more suitable for using the multi-channel active noise control technology, and more indoor noise reduction areas and larger ranges are ensured. A common active noise control system mostly consists of a reference microphone, a secondary speaker, an error microphone, a controller and the like, wherein the reference microphone is used for detecting an original noise signal and is used as an input reference signal of the controller; the secondary loudspeaker is used for emitting an anti-noise signal which has the same amplitude and opposite phase with the original noise wave; the controller is used for performing functions of A/D, D/A conversion, filter coefficient updating, generation of a secondary loudspeaker control signal, power amplification and the like; the error microphone is used for receiving a signal obtained by superposing the noise sound wave and the anti-noise sound wave, namely a sound pressure signal of a target noise reduction point, and feeding back the signal to the controller for carrying out adaptive updating on the filter coefficient. Therefore, the active noise control system with the structure only has a noise reduction effect at the position of the error microphone and the area nearby the error microphone, but if the error microphone is arranged in an indoor area, personnel activities are seriously influenced, and space resources are occupied. Therefore, a virtual microphone technology is needed, and the error information at the target noise reduction point is estimated by using the relation between the physical microphone and the virtual microphone, so that an ideal noise reduction effect can still be achieved under the condition that no microphone is arranged at the target noise reduction point.
In calculating the controller coefficients, a model of the secondary path transfer function is needed. The accuracy of the model, which can be obtained by off-line identification or on-line identification, has a crucial influence on the noise reduction effect. The off-line identification means that before the parameters of the controller are calculated, the parameters of the fixed model of the secondary acoustic path with the specified length are obtained by using related signals and software; on-line identification is to calculate the model of the secondary acoustic path in real time while actively reducing noise. Although online identification can adapt to the change of a secondary sound channel, additional white noise is usually required to be introduced into modeling to serve as an excitation signal, so that residual errors exist in a system all the time, and the modeling process and the active noise control process interfere with each other to influence the noise reduction performance. The secondary acoustic path of the active noise control window is fixed, and the secondary acoustic path cannot be damaged after the virtual microphone technology is combined, so that the method for identifying the secondary acoustic path model offline is adopted, accurate model parameters can be obtained, the noise reduction effect is ensured, and interference to a control system in the noise reduction process is avoided. In addition, most of traffic noise, industrial noise and the like are mobile sound sources, so that the coefficient of the controller needs to be updated in a real-time self-adaptive manner, the mobile sound sources can be adapted, and the normal use of the noise reduction function is ensured.
Referring to fig. 1-3, in the active noise control window of the present invention, the noise reduction region can move along with the head of the user, the motor 11 is installed at the top end of the metal circular tube 4, the motor 11 rotates to drive the metal circular plate 12 to rotate, and the metal circular plate 12 is welded and fixed with the metal circular tube, so that the motor 11 rotates to drive the metal circular tube 4 and the built-in articles to rotate. The active noise control window is provided with a camera 3 for detecting and positioning a personnel activity area, and the camera is placed at a higher position of a roof or a wall surface and can capture the head position of a user in a room. According to the noise reduction requirement, a room is divided into any number of noise reduction areas, and each noise reduction area can be ensured to be directly opposite to the secondary loudspeaker. The controller places the picture captured by the camera 3 in a coordinate system, determines the coordinate range of each noise reduction area, detects the coordinates of the head position of a user in real time by the camera 3, judges the noise reduction area where the coordinates are located, and after the noise reduction area is locked, the controller sends a corresponding pulse signal to the motor driver to drive the motor 11, so that the motor 11 rotates to drive the metal circular tube 4 and the built-in object to rotate, and finally the secondary loudspeaker 9, the reference microphone 8 and the physical error microphone 7 are ensured to face the noise reduction area. If the orientation of the secondary speaker needs to be finely adjusted, the rotation of the motor 11 can be controlled by the keys, so that the secondary speaker 9 and the microphone face to an ideal direction. The secondary loudspeaker 9 of a conventional active noise control system is fixed, so that the noise reduction effect of the side or other positions of the secondary loudspeaker 9 is always lower than that of the opposite direction of the secondary loudspeaker 9 in the noise reduction process. The design of the rotary loudspeaker 9 can be made right for each orientation, ensuring that each noise reduction area has an optimum noise reduction effect.
Because the error microphones are not convenient to arrange in the indoor space, the virtual microphone technology with the auxiliary filter is adopted, so that the noise reduction effect close to that of arranging the physical microphones can be still achieved at the target noise reduction point and the vicinity of the target noise reduction point under the condition of no physical microphone. Referring to fig. 4, the multi-channel active noise reduction control process with the virtual microphone 1 includes two stages, the first stage is a training stage for obtaining an auxiliary filter coefficient; the second stage is a control stage, which is used for active noise reduction and real-time updating of controller parameters.
In the training stage, a virtual microphone 1 is placed at the noise reduction point of each selected noise reduction area, and then the controller parameters with the desired noise reduction effect at the virtual microphone 1 are obtained by using the FxLMS algorithm, where the reference input vector can be expressed as:
wherein xj(n) is the reference signal vector received by the jth reference microphone, expressed as:
xj(n)＝[xj(n),xj(n-1),,xj(n-L+1)]T
where L is the control filter order, and the control filter coefficient matrix w (n) is:
wherein wkj(n) represents a vector of controller coefficients from the jth reference input signal to the kth output control signal, expressed as:
wkj(n)＝[wkj,0(n),wkj,1(n),,wkj,L-1(n)]T
the controller output signal is y (n) ═ wT(n) x (n), wherein y (n) ═ y1(n),y2(n),,yk(n),,yK(n)]T，yk(n) the output signal of the kth channel at the n sampling time is represented, and the controller coefficient taking the virtual microphone as an error signal is calculated by using a multi-channel FxLMS algorithm, and the iterative updating process is defined as:
wherein mu1Step size factor of FxLMS algorithm, ev,i(n) is the ith dummyAn error signal at the microphone. x'v,jki(n) is the filtered reference signal, which is the reference signal x received by the jth reference microphonej(n) and
is obtained by convolution of wherein
A virtual secondary path model for the kth secondary speaker to the ith virtual microphone.
After the controller parameters are obtained, the LMS algorithm is used to train the auxiliary filter, and the iterative update process of the coefficient vector of the mth auxiliary filter can be represented as:
wherein
hmj(n) denotes an auxiliary filter between the jth reference microphone and the mth physical error microphone, of order LhThe filter of (a) may be expressed as:
reference signal vector
Wherein
Is the jth reference signal vector; error signal
Wherein ep,m(n) is the error signal at the mth physical error microphone. After the training phase is finished, the secondary loudspeaker facing each noise reduction area is obtainedThe control stage can be performed by the auxiliary filter coefficients of each channel.
In the active noise control stage, the virtual microphone at the noise reduction point of each noise reduction area is removed, the position of the physical error microphone placed in front of the secondary loudspeaker is unchanged, the auxiliary filter obtained in the training stage, the error signal at the physical error microphone and the secondary path model from each secondary loudspeaker to each physical microphone are utilized, the real-time adaptive updating of the controller coefficient is carried out by combining the FxLMS algorithm, and the adaptive process of the controller coefficient can be represented as:
wherein
ho,mAuxiliary Filter, x 'derived for the training phase'p,jkm(n) is the signal received by the jth reference microphone
The result of the convolution of (a) with (b),
all the secondary acoustic path models in the present invention are estimated from the secondary speaker excitation signal and the microphone receive signal for the secondary acoustic path model from the kth secondary speaker to the mth physical error microphone. By adopting the virtual microphone technology, in the active noise control stage, microphones do not need to be placed at noise reduction points of each noise reduction area, so that the activities of indoor personnel can be ensured not to be interfered, and space resources can be saved.
Examples
Referring to fig. 1, the present invention is applied to indoor noise reduction for reducing noise transmitted into a room through a window and comparing noise reduction effects of a facing area and a side area of a secondary speaker. The test was performed with white noise in the 60-4000Hz band as the noise source, emitted outside the window by a speaker. And selecting a noise reduction point A of a certain noise reduction region and a noise reduction point B of another noise reduction region indoors, and initializing a control filter to be a unit impulse response. Before the function of making an uproar falls and opens, the tester stands near A point, and the speaker is just to A, and the noise source begins the sound production, gathers the noise signal of A point and B point department, opens the function of making an uproar and waits for the system to stabilize after, gathers the noise signal of A point and B point department again for compare the noise reduction effect. Then the tester walks from the position near the point A to the position near the point B, the secondary loudspeaker rotates to be opposite to the point B, related noise signals at the point A and the point B are collected, and the noise before and after noise reduction is compared.
Referring to fig. 5 to 8, it can be seen that the active noise control window of the present invention can effectively reduce the noise transmitted from the outside into the room through the window, and the noise reduction effect of the region directly facing the secondary speaker is better than that of the side region, so that the present invention always ensures the best noise reduction effect of the personnel activity region.
The invention considers that the window with the active noise reduction function and the automatic tracking noise reduction area can simultaneously carry out indoor ventilation and active noise reduction, can automatically track the activity area of personnel, and adjust the orientation of the secondary loudspeaker to ensure that the secondary loudspeaker directly faces the required noise reduction area, thereby ensuring the best noise reduction effect of the area. The foregoing examples are merely illustrative of the present invention and any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes unless expressly stated otherwise. All of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (10)
1. An active noise control window for target tracking, comprising;
the metal window frame structure is formed by combining a metal round pipe (4) and a metal square pipe (5), wherein the metal square pipe (5) is transversely arranged to play a role in fixing and supporting the metal round pipe (4), the metal round pipe (4) is vertically arranged and penetrates into the metal square pipe (5), the metal round pipes (4) on two sides of the metal window frame are welded and fixed with the metal square pipe (5), and the metal round pipe (4) in the middle is not fixed with the metal square pipe (5), so that the metal round pipe (4) can freely rotate; except for the fact that part of the metal round pipe (4) is welded and fixed with the metal square pipe (5), the top ends of the other metal round pipes (4) are provided with motors (11), the motors (11) rotate to drive metal wafers (12) to rotate, the metal wafers (12) are welded and fixed with the metal round pipes (4), and the rotation of the motors (11) drives the metal round pipes (4) to rotate left and right and can rotate to any angle; the metal window frame is internally provided with a wiring groove and a wiring hole, so that the normal placement of an active noise control system line and the attractiveness of the device are guaranteed, the top end and the bottom end of the window frame are respectively provided with a fixing device, and the fixing devices are used for fixing the metal window frame at a building window to guarantee the anti-theft and protection performance.
2. The active noise control window for target tracking according to claim 1, wherein said active noise control system comprises:
the reference microphones (8) are embedded in the metal circular tube (4) and used for collecting original noise signals, and data lines and power lines matched with the reference microphones (8) are placed in the metal window frame;
the secondary loudspeakers (9) are embedded in the metal circular tube (4) and back to the reference microphone (8) and used for sending anti-noise signals so as to reduce noise of an indoor space, and data lines and power lines matched with the secondary loudspeakers (9) are arranged in the metal window frame;
the plurality of physical error microphones (7) are fixed on the metal circular tube (4), are arranged at the positions opposite to the secondary loudspeakers (9), are used for reducing noise of an indoor area by combining a virtual microphone technology under the condition that a microphone does not need to be arranged indoors, do not influence normal activities of indoor personnel and save space resources, and data lines and power lines matched with the physical error microphones (7) are also arranged in the metal window frame;
a camera (3) which is placed at the higher position of the roof or the wall surface of the room and is used for capturing the position of the head of a user in the room and locking the noise reduction area, so that the controller controls the action of the motor in real time to automatically adjust the orientation of a secondary loudspeaker (9) and a reference microphone (8) in the metal circular tube (4);
a motor driver and controller (6), wherein the motor driver is used for receiving the motor control signal and driving the motor (11) to complete the designated action; the controller and the motor driver are placed in a box body and fixed on a wall surface, an input port of the controller is connected with data signal lines of the reference microphone (8), the physical error microphone (7) and the camera (3), an output port of the controller is connected with data signal lines of the secondary loudspeaker (9) and the motor driver, and the physical error microphone (7) is placed in a physical error microphone frame (10).
3. The active noise control window for target tracking according to claim 1, wherein the metal tube (4) of the window frame is continuously rotatable at a speed and direction determined by the operation of the motor (11) at the top end of the metal tube (4).
4. The active noise control window for target tracking according to claim 2, wherein the reference microphone (8), the secondary speaker (9) and the physical error microphone (7) are fixed on the metal circular tube (4) and can rotate along with the rotation of the metal circular tube (4) so as to face any direction.
5. The active noise control window for target tracking according to claim 4, wherein the driving signal of the motor (11) is generated by a controller and is connected to a motor driver through an output port, the start/stop, the rotation direction and the speed of the motor (11) are controlled by the driving signal, the real-time change of the driving signal according to the noise reduction requirement can be automatically completed by the controller, the driving signal controls the motor (11) to rotate to drive the metal circular tube (4) to rotate, and finally, each secondary speaker (9), the reference microphone (8) and the physical error microphone (7) point to an ideal direction, namely the direction of the head of the user.
6. The active noise control window for target tracking according to claim 2, wherein the orientation of the rotatable metal round tube (4) is determined by the position of the indoor person tracked by the camera (3), and the controller drives the motor to rotate after the camera is locked, so that the secondary speaker (9) in the metal round tube (4) faces the area needing noise reduction.
7. An active noise control method based on the active noise control window of any one of claims 1-6, characterized by comprising the steps of:
step 1: determining a noise reduction area;
step 2: calculating an auxiliary filter and a secondary path model;
and step 3: and performing active noise control according to the auxiliary filter and the secondary path model.
8. The method according to claim 7, wherein the step 1 comprises:
step 11, dividing a room into a plurality of noise reduction areas according to the size of the room and the main activity range of personnel;
step 12, determining the corresponding relation between the orientation of a secondary loudspeaker and each noise reduction area, so that when each noise reduction area has noise reduction requirements, the secondary loudspeaker (9) can accurately point to the noise reduction area;
and step 13, placing the room pictures captured by the camera (3) in real time in a coordinate system, wherein each noise reduction area is fixed in a determined coordinate range.
9. The method according to claim 7, wherein the step 2 comprises:
step 21, setting a plurality of noise reduction points in a noise reduction area according to the noise reduction requirement;
step 22, sequentially placing virtual microphones (1) at noise reduction points of the noise reduction area, enabling a secondary loudspeaker (9), a reference microphone (8) and a physical error microphone (7) to point to the noise reduction area, calculating controller parameters which enable each virtual microphone (1) in the noise reduction area to have a good noise reduction effect by using an FxLMS algorithm, and then calculating an auxiliary filter containing controller parameter information by using an LMS algorithm;
step 23, under the condition that the positions of the secondary loudspeaker (9), the reference microphone (8) and the physical error microphone (7) are not changed, modeling an acoustic path between the secondary loudspeaker (9) and the physical error microphone (7) and obtaining corresponding model parameters;
and 24, repeating the step 21 for each noise reduction area, setting noise reduction points in each noise reduction area, changing the orientation of the secondary loudspeaker (9), the reference microphone (8) and the physical error microphone (7) so that the secondary loudspeaker (9), the reference microphone (8) and the physical error microphone (7) are just opposite to the noise reduction area, repeating the step 22 and the step 23 to obtain an auxiliary filter coefficient and a secondary path model corresponding to each noise reduction area, and removing all the virtual microphones (1).
10. The method according to claim 7, wherein the step 3 comprises:
step 31, storing the auxiliary filter coefficient and the physical secondary path model corresponding to each noise reduction area in a controller, and calling the auxiliary filter parameter and the physical secondary path model corresponding to the noise reduction area by the controller after the camera (3) and the controller lock the noise reduction area, and then performing active noise control;
step 32, after the controller obtains a noise reduction area tracked by the camera (3), calculating and generating a driving signal for controlling a motor (11) at the top end of the metal circular tube (4), and enabling each secondary loudspeaker (9) to be over against the noise reduction area by the rotation of the motor (11);
and step 33, starting an active noise reduction function, receiving a noise signal and an error signal in real time by the reference microphone (8) and the physical error microphone (7), transmitting the noise signal and the error signal to the controller, capturing the activity range of indoor personnel in real time by the camera (3) and locking a noise reduction area, generating a motor driving signal and a secondary loudspeaker driving signal by the controller, enabling the secondary loudspeaker (9) to turn to the area needing noise reduction, sending an anti-noise sound wave signal with the same amplitude and opposite phase as the noise sound wave, and superposing the noise sound wave and the anti-noise sound wave of the target noise reduction area to achieve the effect of noise reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011643678.3A CN112669808A (en) | 2020-12-31 | 2020-12-31 | Active noise control window for target tracking and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011643678.3A CN112669808A (en) | 2020-12-31 | 2020-12-31 | Active noise control window for target tracking and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112669808A true CN112669808A (en) | 2021-04-16 |
Family
ID=75412322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011643678.3A Pending CN112669808A (en) | 2020-12-31 | 2020-12-31 | Active noise control window for target tracking and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112669808A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488014A (en) * | 2021-06-23 | 2021-10-08 | 武汉理工大学 | Control method of microphone-free feedforward local active noise control system |
| CN114150596A (en) * | 2021-12-17 | 2022-03-08 | 鲲腾技术有限公司 | Noise reduction barrier, noise reduction method, device and system and storage medium |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146766A (en) * | 2011-02-17 | 2011-08-10 | 南京大学 | Discrete type active noise-reducing, ventilating and sound-insulating window |
| KR20160010814A (en) * | 2014-07-18 | 2016-01-28 | 한국철도기술연구원 | Noise-reducing device |
| US20160329040A1 (en) * | 2015-05-08 | 2016-11-10 | Honda Motor Co., Ltd. | Sound placement of comfort zones |
| CN108915546A (en) * | 2018-08-16 | 2018-11-30 | 吉林大学 | It is a kind of to lead the noise reduction glass plate and its active denoising method passively combined |
| US20190035380A1 (en) * | 2017-07-28 | 2019-01-31 | Harman Becker Automotive Systems Gmbh | Silent zone generation |
| WO2020142690A1 (en) * | 2019-01-04 | 2020-07-09 | Harman International Industries, Incorporated | High-frequency broadband airborne noise active noise cancellation |
| CN111862928A (en) * | 2020-08-20 | 2020-10-30 | 北京驭声科技有限公司 | Snore active noise control system based on remote microphone technology and implementation method |
| CN214312639U (en) * | 2020-12-31 | 2021-09-28 | 北京驭声科技有限公司 | Active noise control window for target tracking |
-
2020
- 2020-12-31 CN CN202011643678.3A patent/CN112669808A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146766A (en) * | 2011-02-17 | 2011-08-10 | 南京大学 | Discrete type active noise-reducing, ventilating and sound-insulating window |
| KR20160010814A (en) * | 2014-07-18 | 2016-01-28 | 한국철도기술연구원 | Noise-reducing device |
| US20160329040A1 (en) * | 2015-05-08 | 2016-11-10 | Honda Motor Co., Ltd. | Sound placement of comfort zones |
| US20190035380A1 (en) * | 2017-07-28 | 2019-01-31 | Harman Becker Automotive Systems Gmbh | Silent zone generation |
| CN108915546A (en) * | 2018-08-16 | 2018-11-30 | 吉林大学 | It is a kind of to lead the noise reduction glass plate and its active denoising method passively combined |
| WO2020142690A1 (en) * | 2019-01-04 | 2020-07-09 | Harman International Industries, Incorporated | High-frequency broadband airborne noise active noise cancellation |
| CN111862928A (en) * | 2020-08-20 | 2020-10-30 | 北京驭声科技有限公司 | Snore active noise control system based on remote microphone technology and implementation method |
| CN214312639U (en) * | 2020-12-31 | 2021-09-28 | 北京驭声科技有限公司 | Active noise control window for target tracking |
Non-Patent Citations (1)
| Title |
|---|
| LAM, B (LAM, BHAN) 等: "Active control of broadband sound through the open aperture of a full-sized domestic window", SCIENTIFIC REPORTS, vol. 10, no. 1, 9 July 2020 (2020-07-09), pages 1 - 7, XP093045778, DOI: 10.1038/s41598-020-66563-z * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488014A (en) * | 2021-06-23 | 2021-10-08 | 武汉理工大学 | Control method of microphone-free feedforward local active noise control system |
| CN114150596A (en) * | 2021-12-17 | 2022-03-08 | 鲲腾技术有限公司 | Noise reduction barrier, noise reduction method, device and system and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107464564B (en) | Voice interaction method, device and equipment | |
| CN107333120B (en) | Integrated sensor based on microphone array and stereoscopic vision | |
| CN108088064B (en) | Active noise reduction device arranged on ventilation pipe orifice and capable of realizing acoustic interaction and control method | |
| US7613310B2 (en) | Audio input system | |
| CN112669808A (en) | Active noise control window for target tracking and control method thereof | |
| US20160024783A1 (en) | Dynamically adjustable acoustic panel device, system and method | |
| JPWO2005076661A1 (en) | Super directional speaker mounted mobile body | |
| WO2001095314A1 (en) | Robot acoustic device and robot acoustic system | |
| CN103308889A (en) | Passive sound source two-dimensional DOA (direction of arrival) estimation method under complex environment | |
| CN104093094A (en) | Indoor voice acquisition method and device based on self-adaptive rotating alignment | |
| CN104270693A (en) | Virtual earphone | |
| CN108389586A (en) | A kind of long-range audio collecting device, monitoring device and long-range collection sound method | |
| CN214312639U (en) | Active noise control window for target tracking | |
| CN110072177B (en) | Space division information acquisition method and device and storage medium | |
| CN103745728B (en) | Method and device for intelligent active noise reduction for house | |
| WO2012096073A1 (en) | Audio-processing device, control method therefor, recording medium containing control program for said audio-processing device, vehicle provided with said audio-processing device, information-processing device, and information-processing system | |
| CN208367199U (en) | Separate type microphone array | |
| CN101843116A (en) | Audio module for the acoustic monitoring of a monitoring region, monitoring system for the monitoring region, method for generating a sound environment, and computer program | |
| CN114446275A (en) | Noise reduction system and method | |
| CN112270915A (en) | Active noise reduction method for indoor space | |
| CN111239691B (en) | Multi-sound-source tracking method for restraining main sound source | |
| CN109493859A (en) | Voice equipment pickup device and voice air conditioner | |
| CN113920973A (en) | Building space noise reduction method, device and system | |
| JP2002264051A (en) | Robot audio-visual system | |
| WO2020071235A1 (en) | Control device for mobile body, control method for mobile body, and program |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |