An anti-interference automatic person-finding active noise reduction barrier system and its control method

Abstract

The present invention discloses an anti-interference automatic person-searching active noise reduction barrier system, comprising: a barrier subsystem and an active noise reduction control subsystem; the barrier subsystem includes: a barrier main body, a rotating support member, and a barrier transmission device; the active noise reduction control subsystem includes: a plurality of reference microphones, a plurality of secondary speakers, an error microphone array, an active noise reduction controller, a positioning sensor, a switch subsystem, and an adjustment subsystem. Also disclosed is a control method for an anti-interference automatic person-searching active noise reduction barrier system, comprising: S1, preparation before control implementation, including establishing a plurality of models, calculating model parameters and storing the parameters in the active noise reduction controller; turning on the power switch and supplying power to the electric control equipment through a storage battery; positioning the original noise direction and adjusting the noise reduction barrier system based on the original noise direction; S2, turning on the switch of the active noise reduction control system, and selecting whether to further turn on the background noise suppression switch according to the user's needs and then performing active noise reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of active noise reduction, and particularly to an anti-interference automatic person-finding active noise reduction barrier system and a control method thereof. Background Art

[0002] In recent years, the health hazards caused by noise to the human body have attracted more and more attention. With the continuous development of the economic society and the improvement of people's requirements for the quality of the ecological environment, improving the environmental sound quality is of great significance for improving environmental noise.

[0003] Most of the methods for blocking noise propagation at the human ear adopt the way of wearing noise-canceling headphones or earplugs, but long-term wearing will cause discomfort to the human ear. The existing noise reduction methods generally adopt the passive noise reduction method to isolate noise. This method has a good suppression effect on high-frequency noise, but a poor suppression effect on low-frequency noise. The propagation of noise has directionality and time-variability. In the daily life or the environment of office work and study, it is impossible to judge the source direction of the noise, and it is difficult to set up a fixed noise reduction device on the noise propagation path by using the passive noise reduction method. Moreover, the fixed noise reduction device cannot freely change with the change of the noise position and cannot meet the noise reduction requirements. The active noise reduction technology generates a sound signal with the same amplitude and opposite phase as the noise signal through a loudspeaker, so as to achieve the purpose of canceling the noise. However, in the actual application scenario, there will be background sounds that do not require noise reduction, so it will interfere with the noise reduction performance of the active noise reduction system. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides the following technical solutions: an anti-interference automatic person-finding active noise reduction barrier system and a control method thereof. The active noise reduction barrier system can be placed in the required scenario according to the needs of the user for use, which is convenient to carry; the active noise reduction barrier system can suppress the background sound generated by positioning the center point of the human head, which is beneficial to improving the noise reduction performance of the active noise reduction control system; according to the real-time change of the original noise signal, the active noise reduction barrier system can adaptively adjust the parameters of the active noise reduction controller. According to the change of the maximum noise source azimuth, the position of the barrier is adjusted so that it faces the azimuth with the largest amplitude of the original noise, and the positioning sensor controls the front of the barrier body to face the center point position of the human head, so as to form the largest range of noise reduction area on the front of the barrier body.

[0005] On the one hand, the present invention provides an anti-interference automatic person-finding active noise reduction barrier system, including: a barrier subsystem and an active noise reduction control subsystem, wherein:

[0006] The barrier subsystem includes: a barrier main body (1), a rotary support, and a barrier transmission device (8); the rotary support includes an electric rotary ball head (30), a first telescopic rod (2), a second telescopic rod (3), a fixed rod (4), a rotary disc (5), and a base (6); a first gear-rack mechanism is provided inside the first telescopic rod (2), and the first telescopic rod (2) is telescopically and fixedly connected to the second telescopic rod (3) through the first gear-rack mechanism, and the first telescopic rod (2) and the second telescopic rod (3) can telescopically move relative to each other; a second gear-rack mechanism is provided inside the second telescopic rod (3), and the second telescopic rod (3) is telescopically and fixedly connected to the fixed rod (4) through the second gear-rack mechanism, and the second telescopic rod (3) and the fixed rod (4) can telescopically move relative to each other; the first gear-rack transmission mechanism and the second gear-rack transmission mechanism are driven by an active noise cancellation controller (17) to drive the barrier main body (1) to move up and down telescopically; the fixed rod (4) is fixedly connected to the rotary disc (5), the rotary disc (5) drives the fixed rod (4) to rotate, and the rotary disc (5) is fixedly connected to the base (6);

[0007] The lower end of the barrier main body (1) is connected to the rotary support, the upper end of the barrier transmission device (8) is fixedly connected to the barrier main body (1), and the lower end is connected to the first telescopic rod (2) through the electric rotary ball head (30), and the electric rotary ball head (30) is used to control and adjust the pitching angle of the barrier main body (1); the upper end and the lower end of the barrier transmission device (8) move relative to each other through a slide rail (24); a third gear-rack transmission mechanism is provided inside the barrier transmission device (8);

[0008] The active noise cancellation control subsystem includes: a plurality of reference microphones (23), a plurality of secondary speakers (21), an error microphone array (16), an active noise cancellation controller (17), a positioning sensor (9), a switch subsystem, and an adjustment subsystem; the active noise cancellation control subsystem is integrated inside the barrier main body (1), the input port of the active noise cancellation controller (17) is connected to the reference microphones (23) and the error microphone array (16), and the output port of the active noise cancellation controller (17) is connected to the secondary speakers (21); the use function of the barrier main body (1) is adjusted through the switch subsystem and the adjustment subsystem;

[0009] The barrier transmission device (8) is installed at the middle position on the back of the barrier main body (1); one end of the barrier transmission device (8) is fixedly connected to the barrier main body (1), and the other end is fixedly connected to the first-stage telescopic rod (2); the barrier transmission device (8) is electrically connected to the active noise reduction controller (17), and controls and drives the third gear-rack transmission mechanism and the electric rotary ball head (30) through the active noise reduction controller (17), so as to drive the barrier main body (1) to move in the left-right direction and / or adjust the pitching angle of the barrier main body (1).

[0010] The positioning sensor (9) is arranged at the middle position above the front of the barrier main body (1) and is used for positioning and identifying the central position of the human head. Through the active noise reduction controller (17) and the third gear-rack transmission mechanism, the position of the active noise reduction barrier system is adjusted to accurately align with the central position of the human head.

[0011] Preferably, rollers (7) are arranged at the lower end of the base (6) and can move freely according to requirements, and the position of the active noise reduction barrier main body (1) is adjusted by controlling the drive.

[0012] Preferably, the switch subsystem includes a positioning noise source switch (10), a background noise suppression switch (12), an active noise reduction control system switch (11), and a power switch (14) arranged on the side of the barrier main body (1); among them:

[0013] The positioning noise source switch (10) is used to start the original noise azimuth positioning;

[0014] The background noise suppression switch (12) is turned on or off according to the noise reduction requirement;

[0015] The error microphone array (16) selectively collects the residual error noise signal or the residual error noise signal after suppressing the interference noise according to whether the background noise suppression switch (12) is turned on, and then feeds it back to the active noise reduction controller (17) in time to adjust the parameters of the active noise reduction controller (17).

[0016] The background noise suppression switch (12) is turned on or off according to the situation, so as to eliminate the background noise feedback signal or the secondary sound feedback signal.

[0017] Preferably, in the case of background noise interference, the background noise suppression switch (12) is turned on. The reference microphone (23) picks up the original noise signal, the background noise signal, and the secondary acoustic feedback signal emitted by the secondary speaker (21), and eliminates the background acoustic feedback signal other than the original noise by establishing a secondary acoustic feedback compensation filter and a background acoustic feedback compensation filter; in the case of no background noise interference, the background noise suppression switch (12) is not turned on, and the reference microphone (23) picks up the original noise signal and the secondary acoustic feedback signal, and eliminates the secondary acoustic feedback signal by establishing a secondary acoustic feedback compensation filter.

[0018] The secondary acoustic feedback compensation filter is obtained by establishing a first acoustic channel model based on the fixed distance between the reference microphone (23) and the secondary speaker (21), establishing a secondary acoustic feedback compensation filter model based on the first acoustic channel model, and obtaining the parameters corresponding to the secondary acoustic feedback compensation filter model at the same time; the background acoustic feedback compensation filter is obtained by establishing a second acoustic channel model based on the fixed distance between the center point of the human head and the reference microphone (23), establishing a background acoustic feedback compensation filter model based on the second acoustic channel model, and obtaining the parameters corresponding to the background acoustic feedback compensation filter model at the same time.

[0019] Preferably, the adjustment subsystem includes a positioning distance adjustment key (13) for adjusting the linear distance between the center point of the human head and the center point of the barrier body (1) according to the noise reduction requirements of the user.

[0020] Preferably, the active noise reduction control subsystem further includes a charging hole (15) and a storage battery (18). The storage battery (18) is controlled by the power switch (14) to supply power to the internal electronic control equipment of the active noise reduction barrier system in the case of no power supply; the storage battery (18) is charged through the charging hole (15); the active noise reduction controller (17) and the storage battery (18) are fixed at the bottom of the barrier body (1), and the charging hole (15) is arranged on the side of the barrier body (1).

[0021] Preferably, it further includes an error microphone array bracket (19) and a fixing bracket (22). The error microphone array (16) is fixed by the error microphone array bracket (19); the reference microphone (23) is fixed on the back of the barrier body (1) through the fixing bracket (22) to collect the original noise signal; the secondary speaker (21) is fixed inside the barrier body (1) through the fixing bracket (22), collects the original noise signal through the reference microphone (23) and transmits it to the active noise reduction controller (17), thereby generating an anti-noise signal, and cancels the noise signal through the principle of acoustic wave cancellation to achieve the purpose of noise reduction.

[0022] Preferably, it further includes a fixed card slot (20), and the fixed bracket (22) and the error microphone array bracket (19) are fixed inside the barrier body (1) through the fixed card slot (20).

[0023] Preferably, the first rack and pinion transmission mechanism, the second rack and pinion transmission mechanism, and the third rack and pinion transmission mechanism are all composed of a motor (25), a transmission shaft (26), a bearing (29), a gear (27), and a rack (28); both ends of the transmission shaft (26) are respectively installed with the bearing (29) and the motor (25), the middle of the transmission shaft (26) is installed with the gear (27), and the gear (27) meshes with the rack (28) for transmission; wherein the motor (25) is controlled to rotate by a signal for driving the motor (25) output by the active noise reduction controller (17) according to the noise reduction azimuth requirement, driving the first rack and pinion transmission mechanism, the second rack and pinion transmission mechanism, and the third rack and pinion transmission mechanism to drive, so as to control the up and down and left and right movement of the barrier body (1).

[0024] The second aspect of the present invention lies in providing a control method for an anti-interference automatic person-finding active noise reduction barrier system, including:

[0025] S1, preparation before implementation of control, including:

[0026] S11, establishing a secondary path model, an acoustic feedback compensation filter, a background acoustic feedback compensation filter, a target noise reduction point path model, and an auxiliary filter, and respectively calculating the parameters of the secondary path model, the acoustic feedback compensation filter, the background acoustic feedback compensation filter, the target noise reduction point path model, and the auxiliary filter and storing the parameters in the active noise reduction controller (17);

[0027] S12, turning on the power switch (14) and supplying power to the electric control equipment through the storage battery (18);

[0028] S13, positioning the original noise azimuth and adjusting the noise reduction barrier system based on the original noise azimuth;

[0029] S2. Turn on the active noise cancellation control system switch (11). According to the user's needs, select whether to further turn on the background noise suppression switch (12). If the background noise suppression switch (12) is selected to be turned off, drive the secondary speaker (21) to generate an anti-noise signal by combining the acoustic signals collected by the reference microphone (23) and the error microphone array (16) at microphones numbered A, C, D, and F, 4 microphones, with the adaptive noise cancellation algorithm and the calculated parameters of the auxiliary filter, secondary path model, and acoustic feedback compensation filter; if the background noise suppression switch (12) is selected to be turned on, drive the secondary speaker (21) to generate an anti-noise signal by combining the original noise signal collected by the reference microphone (23), the residual error noise signal and the background noise signal directionally picked up by the 6 microphones numbered A - F of the error microphone array (16), with the calculated secondary path model, acoustic feedback compensation filter, background acoustic feedback compensation filter, target noise reduction point path model, and auxiliary filter parameters; according to the noise change, the active noise cancellation controller (17) adaptively updates the parameters in real time.

[0030] The anti-interference automatic person-finding active noise cancellation barrier system and its control method provided by the present invention have the following beneficial effects:

[0031] The active noise cancellation barrier system can be placed in the required scenario according to the user's needs for use, which is convenient to carry; the active noise cancellation barrier system can suppress the background noise generated at the center point position of the located human head, which is beneficial to improving the noise cancellation performance of the active noise cancellation control system; according to the real-time change of the original noise signal, the active noise cancellation barrier system can adaptively adjust the parameters of the active noise cancellation controller, and according to the change of the maximum noise source azimuth, adjust the position of the barrier so that it faces the direction with the maximum original noise amplitude, and the positioning sensor controls the front of the barrier body to face the center point position of the human head, so as to form the largest noise cancellation area on the front of the barrier body. Description of the Drawings

[0032] Figure 1 It is a front external structure view of the active noise cancellation barrier system provided according to the preferred embodiment of the present invention.

[0033] Figure 2 It is a back external structure view of the active noise cancellation barrier system provided according to the preferred embodiment of the present invention.

[0034] Figure 3 It is a front internal structure view of the barrier body provided according to the preferred embodiment of the present invention.

[0035] Figure 4 It is a back internal structure view of the barrier body provided according to the preferred embodiment of the present invention.

[0036] Figure 5Internal structure view of the left side of the barrier body provided according to the preferred embodiment of the present invention.

[0037] Figure 6 Schematic diagram of the structural arrangement of the error microphone array provided according to the preferred embodiment of the present invention.

[0038] Figure 7 Internal view of the left side structure of the barrier drive device provided according to the preferred embodiment of the present invention.

[0039] Figure 8 Internal view of the front structure of the barrier drive device provided according to the preferred embodiment of the present invention.

[0040] Figure 9 Internal structure view of the first-stage telescopic rod, second-stage telescopic rod and fixed rod provided according to the preferred embodiment of the present invention.

[0041] Figure 10 Flow chart of the control method of the active noise reduction barrier system provided according to the preferred embodiment of the present invention.

[0042] Figure 11 Schematic diagram of the application scenario of the active noise reduction barrier system provided according to the preferred embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1. Barrier body, 2. First-stage telescopic rod, 3. Second-stage telescopic rod, 4. Fixed rod,

[0045] 5. Rotating disc, 6. Base, 7. Roller, 8. Barrier drive device,

[0046] 9. Positioning sensor, 10. Positioning noise source switch,

[0047] 11. Active noise reduction control system switch, 12. Background noise suppression switch,

[0048] 13. Positioning distance adjustment key, 14. Power switch, 15. Charging hole,

[0049] 16. Error microphone array, 17. Active noise reduction controller, 18. Battery,

[0050] 19. Error microphone array bracket, 20. Fixed card slot, 21. Secondary speaker,

[0051] 22. Fixed bracket, 23. Reference microphone, 24. Slide rail, 25. Motor,

[0052] 26. Transmission shaft, 27. Gear, 28. Rack, 29. Bearing,

[0053] 30. Electric rotating ball head. Embodiment

[0054] In order to better understand the above technical solution, the following will describe the above technical solution in detail in conjunction with the accompanying drawings of the specification and specific embodiments.

[0055] The method provided by the present invention can be implemented in the following terminal environment. The terminal may include one or more of the following components: a processor, a memory, and a display screen. Among them, at least one instruction is stored in the memory, and the instruction is loaded and executed by the processor to implement the method of the following embodiments.

[0056] The processor may include one or more processing cores. The processor uses various interfaces and lines to connect various parts within the entire terminal, and by running or executing instructions, programs, code sets, or instruction sets stored in the memory, and by calling data stored in the memory, it executes various functions of the terminal and processes data.

[0057] The memory may include a random access memory (RAM), and may also include a read-only memory (ROM). The memory can be used to store instructions, programs, code, code sets, or instructions.

[0058] The display screen is used to display the user interfaces of various application programs.

[0059] In addition, those skilled in the art can understand that the structure of the above terminal does not constitute a limitation on the terminal. The terminal may include more or fewer components, or combine certain components, or have different component arrangements. For example, the terminal may also include components such as a radio frequency circuit, an input unit, a sensor, an audio circuit, and a power supply, which will not be elaborated here.

[0060] See Figures 1-5 , on the one hand, the present invention provides an anti-interference automatic person-finding active noise reduction barrier system, including: a barrier subsystem and an active noise reduction control subsystem, where:

[0061] The barrier subsystem includes: a barrier main body 1, a rotary support, and a barrier transmission device 8; in this embodiment, the rotary support includes an electric rotary ball head 30, a first telescopic rod 2, a second telescopic rod 3, a fixed rod 4, a rotary disk 5, and a base 6; a first gear-rack mechanism is arranged inside the first telescopic rod 2, and the first telescopic rod 2 is telescopically and fixedly connected to the second telescopic rod 3 through the first gear-rack mechanism, and the first telescopic rod 2 and the second telescopic rod 3 can telescopically move relative to each other; a second gear-rack mechanism is arranged inside the second telescopic rod 3, and the second telescopic rod 3 is telescopically and fixedly connected to the fixed rod 4 through the second gear-rack mechanism, and the second telescopic rod 3 and the fixed rod 4 can telescopically move relative to each other; the first gear-rack transmission mechanism and the second gear-rack transmission mechanism are driven by the active noise reduction controller 17 to drive the barrier main body 1 to move up and down telescopically; the fixed rod 4 is fixedly connected to the rotary disk 5, the rotary disk 5 drives the fixed rod 4 to rotate, and the rotary disk 5 is fixedly connected to the base 6;

[0062] The lower end of the barrier main body 1 is connected to the rotary support, the upper end of the barrier transmission device 8 is fixedly connected to the barrier main body 1, and the lower end is connected to the first telescopic rod 2 through the electric rotary ball head 30. The electric rotary ball head 30 is used to control and adjust the pitching angle of the barrier main body 1; the upper end and the lower end of the barrier transmission device 8 move relative to each other through a slide rail 24; a third gear-rack transmission mechanism is arranged inside the barrier transmission device 8;

[0063] The active noise reduction control subsystem includes: a plurality of reference microphones 23, a plurality of secondary speakers 21, an error microphone array 16, an active noise reduction controller 17, a positioning sensor 9, a switch subsystem, and an adjustment subsystem; the active noise reduction control subsystem is integrated inside the barrier main body 1. The input port of the active noise reduction controller 17 is connected to the reference microphones 23 and the error microphone array 16, and the output port of the active noise reduction controller 17 is connected to the secondary speakers 21; the use functions of the barrier main body 1 are adjusted through the switch subsystem and the adjustment subsystem;

[0064] The barrier transmission device 8 is installed at the middle position on the back of the barrier main body 1; one end of the barrier transmission device 8 is fixedly connected to the barrier main body 1, and one end is fixedly connected to the first telescopic rod 2; the barrier transmission device 8 is electrically connected to the active noise reduction controller 17, and the active noise reduction controller 17 controls and drives the third gear-rack transmission mechanism and the electric rotary ball head 30, so as to drive the barrier main body 1 to move in the left-right direction and / or adjust the pitching angle of the barrier main body 1;

[0065] The positioning sensor 9 is arranged at the middle position above the front of the barrier main body 1, and is used to locate and identify the center position of the human head. Through the active noise reduction controller 17 and the third gear-rack transmission mechanism, the position of the active noise reduction barrier system is adjusted to accurately align with the center position of the human head, so as to achieve the maximum noise reduction effect near the human ear.

[0066] As a preferred embodiment, rollers 7 are provided at the lower end of the base 6, which can be freely moved according to requirements. The position of the active noise reduction barrier system is adjusted by controlling the drive. In this embodiment, four rollers are provided. Of course, those skilled in the art can set any number according to needs, and all are within the protection scope of the present invention.

[0067] As a preferred embodiment, the switch subsystem includes a positioning noise source switch 10, a background noise suppression switch 12, an active noise reduction control system switch 11, and a power switch 14 provided on the side of the barrier body 1; among them:

[0068] The positioning noise source switch 10 is used to start the original noise azimuth positioning; in this embodiment, the error microphone array 16 realizes the original noise azimuth positioning function through the beamforming algorithm, so as to find the azimuth of the original noise with the largest amplitude near the barrier 1;

[0069] The background noise suppression switch 12 is turned on or off according to the noise reduction requirements;

[0070] In this embodiment, on the one hand, the error microphone array 16 selectively collects the residual error noise signal (when the background noise suppression switch 12 is turned on) or the residual error noise signal after suppressing the interference noise (when the background noise suppression switch 12 is turned off) according to whether the background noise suppression switch 12 is turned on, so as to timely feedback to the active noise reduction controller 17 to adjust the parameters of the active noise reduction controller 17, so that the active noise reduction controller 17 can more accurately output the anti-noise signal, which is beneficial to optimizing the noise reduction effect and improving the noise reduction performance;

[0071] Specifically, when the background noise suppression switch 12 is turned on, the 6 microphones numbered A-F in the error microphone array 16 work simultaneously, and can directionally pick up the residual error noise signal, suppressing the background noise other than the residual error noise, so as to improve the noise reduction performance of the active noise reduction control system; when the background noise suppression switch 12 is turned off, the 4 microphones numbered A, C, D, and F in the error microphone array 16 work simultaneously, and the active noise reduction controller 17 reduces the calculation of the background noise suppression algorithm, reduces the workload of the operation of the active noise reduction controller 17, and improves the real-time performance of the active noise reduction control system;

[0072] In this embodiment, on the second aspect, the background noise suppression switch 12 is turned on or off according to the situation, so as to eliminate the background noise feedback signal or the secondary sound feedback signal;

[0073] Specifically, in the case of background noise interference, the background noise suppression switch 12 is turned on. The reference microphone 23 picks up the original noise signal, the background noise signal, and the secondary sound feedback signal emitted by the secondary speaker 21, and eliminates the background sound feedback signal other than the original noise by establishing a secondary sound feedback compensation filter and a background sound feedback compensation filter; in the case of no background noise interference, the background noise suppression switch 12 is not turned on, the reference microphone 23 picks up the original noise signal and the secondary sound feedback signal, and eliminates the secondary sound feedback signal by establishing a secondary sound feedback compensation filter.

[0074] In this embodiment, the secondary sound feedback compensation filter is obtained by establishing a first sound channel model based on the fixed distance between the reference microphone 23 and the secondary speaker 21, establishing a secondary sound feedback compensation filter model based on the first sound channel model, and obtaining the parameters corresponding to the secondary sound feedback compensation filter model at the same time; the background sound feedback compensation filter is obtained by establishing a second sound channel model based on the fixed distance between the center point of the human head and the reference microphone 23, establishing a background sound feedback compensation filter model based on the second sound channel model, and obtaining the parameters corresponding to the background sound feedback compensation filter model at the same time.

[0075] As a preferred embodiment, the adjustment subsystem includes a positioning distance adjustment key 13 for adjusting the straight-line distance between the center point of the human head and the center point of the barrier body 1 according to the noise reduction requirements of the user, so as to obtain a better active noise reduction effect. In this embodiment, three straight-line distances between the center point of the human head and the center point of the barrier body 1 can be adjusted, which are 0.5 meters, 1 meter, and 1.5 meters respectively. Of course, those skilled in the art can also set other straight-line distance ranges according to needs, which are all within the protection scope of the present invention.

[0076] As a preferred embodiment, the active noise reduction control subsystem further includes a charging hole 15 and a storage battery 18. The storage battery 18 powers the internal electric control devices of the active noise reduction barrier system when there is no power supply under the control of the power switch 14; the storage battery 18 is charged through the charging hole 15; the active noise reduction controller 17 and the storage battery 18 are fixed at the bottom of the barrier body 1, and the charging hole 15 is arranged on the side of the barrier body 1.

[0077] In this embodiment, the scope of the internal electric control devices includes: the positioning sensor 9, the power switch 14, the positioning noise source switch 10, the background noise suppression switch 12, the active noise reduction control system switch 11, the positioning distance adjustment key 13, the reference microphone 23, the secondary speaker 21, the error microphone array 16, the active noise reduction controller 17, the gear-rack transmission mechanism, the roller 7, the electric rotary ball head 30, and the rotating disc 5; each internal electric control device is controlled electrically.

[0078] As a preferred embodiment, it further includes an error microphone array bracket 19, and the error microphone array 16 is fixed by the error microphone array bracket 19.

[0079] As a preferred embodiment, it further includes a fixing bracket 22; the reference microphone 23 is fixed on the back of the barrier main body 1 through the fixing bracket 22 to collect the original noise signal; the secondary speaker 21 is fixed inside the barrier main body 1 through the fixing bracket 22, collects the original noise signal through the reference microphone 23 and transmits it to the active noise reduction controller 17, thereby generating an anti-noise signal, and cancels the noise signal through the acoustic cancellation principle to achieve the purpose of noise reduction.

[0080] As a preferred embodiment, it further includes a fixing slot 20, and the fixing bracket 22 and the error microphone array bracket 19 are fixed inside the barrier main body 1 through the fixing slot 20.

[0081] See Figures 7-9 , as a preferred embodiment, the first gear-rack transmission mechanism, the second gear-rack transmission mechanism and the third gear-rack transmission mechanism are all composed of a motor 25, a transmission shaft 26, bearings 29, a gear 27 and a rack 28; bearings 29 and the motor 25 are respectively installed at both ends of the transmission shaft 26, a gear 27 is installed in the middle of the transmission shaft 26, and the gear 27 meshes with the rack 28 for transmission; wherein the motor 25 is controlled to rotate by a signal for driving the motor 25 output by the active noise reduction controller 17 according to the noise reduction azimuth requirement, driving the first gear-rack transmission mechanism, the second gear-rack transmission mechanism and the third gear-rack transmission mechanism to drive, thereby controlling the up and down and left and right movement of the barrier main body 1.

[0082] See Figure 10 , the second aspect of the present invention also lies in providing a control method for an anti-interference automatic person-finding active noise reduction barrier system, including:

[0083] S1, preparation before implementing control, including:

[0084] S11, establishing a secondary path model, an acoustic feedback compensation filter, a background acoustic feedback compensation filter, a target noise reduction point path model and an auxiliary filter, and respectively calculating the parameters of the secondary path model, the acoustic feedback compensation filter, the background acoustic feedback compensation filter, the target noise reduction point path model and the auxiliary filter and storing the parameters in the active noise reduction controller 17;

[0085] In this embodiment, when the active noise reduction controller 17 realizes the active noise reduction barrier function, calculate the secondary path model, the acoustic feedback compensation filter, the background acoustic feedback compensation filter, the target noise reduction point path model and the auxiliary filter; wherein:

[0086] (1) The secondary path model is established based on the fixed positions among the secondary speaker 21 and the error microphone array 16 with serial numbers A, C, D, and F, i.e., the four microphones.

[0087] (2) The acoustic feedback compensation filter is established based on the fixed position between the secondary speaker 21 and the reference microphone 23.

[0088] (3) The background acoustic feedback compensation filter is established based on three fixed linear distances of 0.5 m, 1 m, and 1.5 m from the reference microphone 23 and the error microphone array 16 to the center point of the human head.

[0089] (4) The target noise reduction point path model is the deviation between the residual error noise signal directionally picked up by the error microphone array 16 and the residual error noise signal picked up by the error microphone alone. By directionally picking up the acoustic signal obtained by a single secondary speaker 21 by the error microphone array 16 and the acoustic signal collected by a single error microphone facing the secondary speaker 21, the target noise reduction point path model is established.

[0090] (5) The auxiliary filter establishes corresponding virtual microphones based on three fixed linear distances of 0.5 m, 1 m, and 1.5 m from the barrier body 1 to the center point of the human head. It is established based on the fixed distance between the error microphone array 16 and the virtual microphone. After obtaining the required parameters, the virtual microphone is removed.

[0091] S12. Turn on the power switch 14 and supply power to the electronic control device through the storage battery 18.

[0092] S13. Locate the original noise direction and adjust the noise reduction barrier system based on the original noise direction.

[0093] In this embodiment, the implementation manner of S13 includes:

[0094] 1. Locate the original noise direction: Turn on the positioning noise source switch 10. The error microphone array 16 picks up the environmental acoustic signal. According to the beamforming algorithm, the active noise reduction controller 17 calculates the position information of the maximum original noise. Thus, through the control drive of the active noise reduction controller 17, after transmission by the first, second, and third gear-rack transmission mechanisms and the electric rotary ball head 30, the rotary disk 5, and the roller 7, the active noise reduction barrier body 1 is driven to face the maximum azimuth of the sound source with its back, thereby maximizing the noise reduction range of the active noise reduction barrier system.

[0095] 2. Adjust the noise reduction barrier system based on the original noise direction, including: adjusting the pitch angle and direction angle of the active noise reduction barrier body (1); among which:

[0096] (1) Adjusting the pitch angle requires changing the height of the barrier body 1 and the inclination angle of the barrier body 1:

[0097] A. The beamforming algorithm calculates the angular information of the original noise pitch angle, and sets the distance from the barrier main body 1 to the center point of the human head as a fixed value. Through geometric relationship operations, the height information that the first telescopic rod and the second telescopic rod need to change is judged;

[0098] B. The tilt angle of the barrier main body 1 is adjusted by the electric rotary ball head 30 according to the pitch angle position information;

[0099] (2) To adjust the azimuth angle, the position of the active noise reduction barrier main body (1) needs to be changed. The beamforming algorithm calculates the position information of the original noise azimuth angle. Since the position distance from the barrier main body (1) to the center point of the human head is set as a fixed value, with this fixed value as the radius, the azimuth angle that the roller 7 needs to change when rotating in an arc trajectory can be obtained. The circumference of the arc trajectory where the roller 7 rotates is calculated based on the direction angle information and the fixed value set for the distance from the barrier main body (1) to the center point of the human head;

[0100] 3. If the beamforming algorithm locates the position information of multiple original noises, the position information of the original noise with the largest amplitude is taken as the reference, so as to adjust the azimuth angle and pitch angle of the barrier main body 1;

[0101] S2. Turn on the switch 11 of the active noise reduction control system. According to the user's needs, choose whether to further turn on the switch 12 for suppressing background noise. If the switch 12 for suppressing background noise is selected to be turned off, the sound signals collected by the reference microphone 23 and the error microphone array 16 at serial numbers A, C, D, and F, 4 microphones are combined with the adaptive noise reduction algorithm and the calculated parameters of the auxiliary filter, secondary path model, and acoustic feedback compensation filter to drive the secondary speaker 21 to generate an anti-noise signal; if the switch 12 for suppressing background noise is selected to be turned on, the original noise signal collected by the reference microphone 23, the residual error noise signals and background noise signals directionally picked up by the 6 microphones of the error microphone array 16 at serial numbers A - F are combined with the calculated secondary path model, acoustic feedback compensation filter, background acoustic feedback compensation filter, target noise reduction point path model, and auxiliary filter parameters to drive the secondary speaker 21 to generate an anti-noise signal; according to the change of noise, the active noise reduction controller 17 adaptively updates the parameters in real time.

[0102] Reference Figure 6 and Figure 11, the present invention is used in front of a daily study or office desk to reduce the interference of traffic noise from outside the window. By turning on the positioning noise source switch 10, the active noise reduction barrier drives and adjusts the maximum direction of the back of the barrier body 1 facing the sound source according to the collected sound signals. The positioning sensor 9 adjusts the orientation of the barrier body 1 to face the center position of the human head according to the user's needs, and sets a fixed relative distance value. When the user is in a static and silent state, the active noise reduction control system switch 11 is turned on, and the active noise reduction controller 17 adjusts the parameters of the active noise reduction controller 17 in real time according to the environmental noise changes, so as to form a noise reduction area with the center position of the human head as the reference. When the user needs to make a sound, such as making a phone call or having a video conference, the background sound suppression switch 12 can be turned on on the basis of turning on the active noise reduction control system switch 11 to prevent the user's sound signal from affecting the noise reduction performance of the active noise reduction control system. The linear distance between the user and the barrier body 1 can be adjusted according to the user's needs, and the active noise reduction controller 17 adjusts the parameters in real time according to the distance changes, always ensuring a good noise reduction effect in the user's head area.

[0103] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. An anti-interference automatic person-searching and active noise reduction barrier system, characterized in that Comprising: A barrier subsystem and an active noise reduction control subsystem, wherein: The barrier subsystem includes: a barrier main body (1), a rotary support, and a barrier transmission device (8); the rotary support includes an electric rotary ball head (30), a first-stage telescopic rod (2), a second-stage telescopic rod (3), a fixed rod (4), a rotary disc (5), and a base (6); a first gear-rack transmission mechanism is provided inside the first-stage telescopic rod (2), and the first-stage telescopic rod (2) is telescopically and fixedly connected to the second-stage telescopic rod (3) through the first gear-rack transmission mechanism, and the first-stage telescopic rod (2) and the second-stage telescopic rod (3) can relatively telescopically move; a second gear-rack transmission mechanism is provided inside the second-stage telescopic rod (3), and the second-stage telescopic rod (3) is telescopically and fixedly connected to the fixed rod (4) through the second gear-rack transmission mechanism, and the second-stage telescopic rod (3) and the fixed rod (4) can relatively telescopically move; the first gear-rack transmission mechanism and the second gear-rack transmission mechanism are controlled by an active noise reduction controller (17) to drive the barrier main body (1) to move up and down telescopically; the fixed rod (4) is fixedly connected to the rotary disc (5), the rotary disc (5) drives the fixed rod (4) to rotate, and the rotary disc (5) is fixedly connected to the base (6); The lower end of the barrier main body (1) is connected to the rotary support, the upper end of the barrier transmission device (8) is fixedly connected to the barrier main body (1), and the lower end is connected to the first-stage telescopic rod (2) through the electric rotary ball head (30), and the electric rotary ball head (30) is used to control and adjust the pitching angle of the barrier main body (1); the upper end and the lower end of the barrier transmission device (8) relatively move through a slide rail (24); a third gear-rack transmission mechanism is provided inside the barrier transmission device (8); The active noise reduction control subsystem includes: a plurality of reference microphones (23), a plurality of secondary speakers (21), an error microphone array (16), an active noise reduction controller (17), a positioning sensor (9), a switch subsystem, and an adjustment subsystem; the active noise reduction control subsystem is integrated inside the barrier main body (1), the input port of the active noise reduction controller (17) is connected to the reference microphones (23) and the error microphone array (16), and the output port of the active noise reduction controller (17) is connected to the secondary speakers (21); the use function of the barrier main body (1) is adjusted through the switch subsystem and the adjustment subsystem; The barrier transmission device (8) is installed at the middle position on the back of the barrier main body (1); one end of the barrier transmission device (8) is fixedly connected to the barrier main body (1), and one end is fixedly connected to the first-stage telescopic rod (2); the barrier transmission device (8) is electrically connected to the active noise reduction controller (17), and the third gear-rack transmission mechanism and the electric rotary ball head (30) are controlled and driven by the active noise reduction controller (17), so as to drive the barrier main body (1) to move in the left-right direction and / or adjust the pitching angle of the barrier main body (1); The positioning sensor (9) is arranged at the middle position above the front of the barrier body (1) and is used to locate and identify the center position of the human head. Through the active noise reduction controller (17) and the third rack and pinion transmission mechanism, the position of the active noise reduction barrier system is adjusted to accurately align with the center position of the human head.

2. The anti-interference automatic person-finding active noise reduction barrier system according to claim 1, wherein, Rollers (7) are arranged at the lower end of the base (6) and can move freely according to requirements. The position of the active noise reduction barrier body (1) is adjusted by controlling the drive.

3. The anti-interference automatic person search and active noise reduction barrier system according to claim 2, wherein, The switch subsystem includes a positioning noise source switch (10), a background noise suppression switch (12), an active noise reduction control system switch (11), and a power switch (14) arranged on the side of the barrier body (1); where: The positioning noise source switch (10) is used to start the positioning of the original noise direction. The background noise suppression switch (12) is turned on or off according to the noise reduction requirements. According to whether the background noise suppression switch (12) is turned on, the error microphone array (16) selectively collects the residual error noise signal or the residual error noise signal after suppressing the interference noise, so as to feed back to the active noise reduction controller (17) in time to adjust the parameters of the active noise reduction controller (17). The background noise suppression switch (12) is turned on or off according to the situation, so as to eliminate the background sound feedback signal or the secondary sound feedback signal.

4. An anti-interference automatic person-searching active noise reduction barrier system according to claim 3, characterized in that, In the case of background noise interference, the background noise suppression switch (12) is turned on. The reference microphone (23) picks up the original noise signal, the background noise signal, and the secondary sound feedback signal emitted by the secondary speaker (21). The background sound feedback signal other than the original noise is eliminated by establishing a secondary sound feedback compensation filter and a background sound feedback compensation filter; in the case of no background noise interference, the background noise suppression switch (12) is not turned on. The reference microphone (23) picks up the original noise signal and the secondary sound feedback signal, and the secondary sound feedback signal is eliminated by establishing a secondary sound feedback compensation filter. The secondary sound feedback compensation filter is obtained by establishing a first sound channel model based on the fixed distance between the reference microphone (23) and the secondary speaker (21), establishing a secondary sound feedback compensation filter model based on the first sound channel model, and obtaining the parameters corresponding to the secondary sound feedback compensation filter model at the same time. The background sound feedback compensation filter is obtained by establishing a second sound channel model based on the fixed distance between the center point of the human head and the reference microphone (23), establishing a background sound feedback compensation filter model based on the second sound channel model, and obtaining the parameters corresponding to the background sound feedback compensation filter model at the same time.

5. An anti-interference automatic person-searching and active noise reduction barrier system according to claim 4, characterized in that, The adjustment subsystem includes a positioning distance adjustment key (13) for adjusting the straight-line distance between the center point of the human head and the center point of the barrier body (1) according to the noise reduction requirements of the user.

6. An anti-interference automatic person search and active noise reduction barrier system according to claim 5, characterized in that, The active noise cancellation control subsystem further includes a charging hole (15) and a storage battery (18). The storage battery (18) is controlled by the power switch (14) to supply power to the internal electronic control devices of the active noise cancellation barrier system in the absence of power. The storage battery (18) is charged through the charging hole (15). The active noise cancellation controller (17) and the storage battery (18) are fixed at the bottom of the barrier body (1), and the charging hole (15) is arranged on the side of the barrier body (1).

7. An anti-interference automatic person search and active noise reduction barrier system according to claim 6, characterized in that, It further includes an error microphone array bracket (19) and a fixing bracket (22). The error microphone array (16) is fixed through the error microphone array bracket (19). The reference microphone (23) is fixed on the back of the barrier body (1) through the fixing bracket (22) to collect the original noise signal. The secondary speaker (21) is fixed inside the barrier body (1) through the fixing bracket (22), collects the original noise signal through the reference microphone (23) and transmits it to the active noise cancellation controller (17), thereby generating an anti-noise signal. Through the principle of sound wave cancellation, the noise signal is cancelled to achieve the purpose of noise reduction.

8. An anti-interference automatic person-searching active noise reduction barrier system according to claim 7, characterized in that, It further includes a fixing card slot (20). The fixing bracket (22) and the error microphone array bracket (19) are fixed inside the barrier body (1) through the fixing card slot (20).

9. An anti-interference automatic person-searching active noise reduction barrier system according to claim 8, characterized in that, The first gear-rack transmission mechanism, the second gear-rack transmission mechanism, and the third gear-rack transmission mechanism are all composed of a motor (25), a transmission shaft (26), a bearing (29), a gear (27), and a rack (28). The bearing (29) and the motor (25) are respectively installed at both ends of the transmission shaft (26), the gear (27) is installed in the middle of the transmission shaft (26), and the gear (27) meshes with the rack (28) for transmission. Among them, the motor (25) is controlled to rotate by a signal for driving the motor (25) output by the active noise cancellation controller (17) according to the noise reduction azimuth requirement, driving the first gear-rack transmission mechanism, the second gear-rack transmission mechanism, and the third gear-rack transmission mechanism to drive, so as to control the up and down and left and right movement of the barrier body (1).

10. A control method for an anti-interference automatic person-searching and active noise reduction barrier system according to claim 9, characterized in that, Including: S1. Preparation before implementing control, including: S11. Establish a secondary path model, an acoustic feedback compensation filter, a background acoustic feedback compensation filter, a target noise reduction point path model, and an auxiliary filter, and calculate the parameters of the secondary path model, the acoustic feedback compensation filter, the background acoustic feedback compensation filter, the target noise reduction point path model, and the auxiliary filter respectively, and store the parameters in the active noise cancellation controller (17); S12. Turn on the power switch (14) and supply power to the electronic control devices through the storage battery (18); S13. Locate the original noise azimuth and adjust the noise cancellation barrier system based on the original noise azimuth; S2, turn on the active noise cancellation control system switch (11), and select whether to further turn on the background noise suppression switch (12) according to the user's needs. If the background noise suppression switch (12) is selected to be turned off, drive the secondary speaker (21) to generate an anti-noise signal by combining the acoustic signals collected by the reference microphone (23) and the error microphone array (16), microphones numbered A, C, D, and F, with the adaptive noise cancellation algorithm and the calculated parameters of the auxiliary filter, secondary path model, and acoustic feedback compensation filter; if the background noise suppression switch (12) is selected to be turned on, drive the secondary speaker (21) to generate an anti-noise signal by combining the original noise signal collected by the reference microphone (23), the residual error noise signal and the background noise signal directionally picked up by the 6 microphones numbered A - F of the error microphone array (16), with the calculated secondary path model, acoustic feedback compensation filter, background noise feedback compensation filter, target noise reduction point path model, and auxiliary filter parameters; according to the noise change, the active noise cancellation controller (17) adaptively updates the parameters in real time.

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