CN112669807A - Noise directional active control method - Google Patents
Noise directional active control method Download PDFInfo
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- CN112669807A CN112669807A CN202011591787.5A CN202011591787A CN112669807A CN 112669807 A CN112669807 A CN 112669807A CN 202011591787 A CN202011591787 A CN 202011591787A CN 112669807 A CN112669807 A CN 112669807A
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Abstract
The invention belongs to the technical field of noise control, and particularly relates to a noise directional active control method. The invention realizes the control of the noise of the designated area or the whole field area by controlling the noise by utilizing the directional secondary sound source. The directional secondary sound source can be used for controlling noise of a reverberation sound field, a direct sound field or both the reverberation sound field and the direct sound field, and can also realize tracking control on mobile noise. The invention can be used for controlling indoor noise with different geometric shapes and sizes and can also be used for controlling outdoor noise.
Description
Technical Field
The invention belongs to the technical field of noise control, and particularly relates to a noise directional active control method.
Background
The noise active control method is widely applied due to wide applicable frequency band and good control effect. Generally, a reference sensor is used to measure a noise source sound signal, and after the noise source sound signal is phase-shifted and amplified, an infrasound source is pushed to generate a same-frequency sound with the same amplitude and opposite phase with a noise source, so that the noise source sound is counteracted, and the purpose of controlling the noise is achieved. Because the infrasound sources have no directivity, the noise control in the designated direction or area needs to be realized by the reasonable layout of a plurality of infrasound sources in space, thereby not only increasing the number of the infrasound sources, but also increasing the difficulty of a control system.
In the specific noise control, due to the requirements of control purposes and cost, the noise in a certain specified direction or a specified area is often required to be controlled, and for the indoor noise with reverberant sound, if the direct sound emitted by a sound source can be effectively controlled, the noise in the whole room can be greatly reduced. However, since the infrasound source for active noise control has no directivity, it is difficult to implement, and in addition, the traditional infrasound source has no directivity, and it is impossible to implement tracking control of the moving noise source.
Disclosure of Invention
The invention aims to provide a noise directional active control method to solve the defects in the noise active control technology.
The noise directional active control method provided by the invention realizes effective control of noise through the directional infrasound source, can realize control of the noise in a designated area, can directly control direct sound of a sound source, and can perform tracking control on a mobile noise source.
The principle of the noise directional active control method provided by the invention is shown in fig. 1, and a control system consisting of the following devices is used: the device comprises a comparison sensor, a reference sensor, a controller, a signal processor, a power amplifier and a secondary sound source; the method comprises the following specific steps:
(1) determining a noise control point or area, placing a comparison sensor at the control point, adjusting the direction of the secondary sound source to make the axis aligned with the position of the comparison sensor, and adjusting the emission angle of the secondary sound source according to the area of the noise to be controlled to make the sound wave emitted by the secondary sound source cover the noise area to be controlled;
(2) a reference sensor is placed near the noise source for measuring the amplitude, frequency and phase of the noise source. The signal obtained by the reference sensor is subjected to phase shift amplification and related processing by the controller, then is sent to the signal processor for carrier modulation, and then the modulated wave is amplified by the power amplifier to push the infrasound source to emit directional sound waves;
(3) and detecting whether the sound pressure level of the control point reaches a control target by using the comparison sensor, if not, feeding back the signal of the comparison sensor to the controller, adjusting the signal input into the signal processor by using the controller, pushing the secondary sound source by using the power amplifier, and adjusting the sound pressure level of the secondary sound source until the sound pressure level of the control point measured by the comparison sensor reaches the control target.
In the invention, when the noise source moves, the positions of the comparison sensor and the secondary sound source move synchronously along with the noise source.
In the invention, the directivity adjustment can be carried out on the infrasound source through phase modulation or a mechanical method so as to realize the tracking control of different noise control points.
In the invention, the secondary sound source is an active directional sound source designed according to the parametric array principle.
In the invention, the secondary sound source is composed of an ultrasonic transducer array, and the directional emission of the sound wave of the secondary sound source is realized by emitting a modulation wave which takes an ultrasonic signal as a carrier wave and takes a modulation signal as a noise control signal. Wherein, the diameter of the single ultrasonic transducer is 10-16 mm, and the frequency of transmitting ultrasonic waves is 15-120 KHz; all the ultrasonic transducers are closely arranged, the number of the ultrasonic transducers is dozens to tens of thousands (such as 50-50000), and the shape of the array can be circular, hexagonal, rectangular, square, oval or a combination of several shapes.
The method is applicable to a reverberation sound field, a direct sound field or a noise field with both reverberation and direct sound fields.
Drawings
FIG. 1 is a graphical representation of the noise-directed active control of the present invention.
Detailed Description
Referring to fig. 1, a control system consisting of the following devices is used: the device comprises a comparison sensor, a reference sensor, a controller, a signal processor, a power amplifier, a noise source and an infrasound source; the noise directional active control method comprises the following specific steps:
1. determining a noise control point or area, placing a comparison sensor at the control point, adjusting the direction of the secondary sound source to make the axis aligned with the position of the comparison sensor, and adjusting the emission angle of the secondary sound source according to the area of the noise to be controlled to make the sound wave emitted by the secondary sound source cover the noise area to be controlled;
2. the signals obtained by the reference sensor are subjected to phase shift amplification and related processing by the controller, then sent to the signal processor for carrier modulation, and then the modulated waves are amplified by the power amplifier to push the infrasound source to emit directional sound waves;
3. and detecting whether the sound pressure level of the control point reaches a control target by using the comparison sensor, if not, feeding back the signal of the comparison sensor to the controller, adjusting the signal input into the signal processor by using the controller, pushing the secondary sound source by using the power amplifier, and adjusting the sound pressure level of the secondary sound source until the sound pressure level of the control point measured by the comparison sensor reaches the control target.
For the control of a moving noise source, the position of the comparison sensor and the secondary source should move synchronously with the noise source.
The above embodiments are applicable to reverberant, direct sound fields, or noisy fields with both reverberant and direct sound fields.
Claims (6)
1. A noise directional active control method uses a control system consisting of the following devices: the device comprises a comparison sensor, a reference sensor, a controller, a signal processor, a power amplifier and a secondary sound source; the method is characterized by comprising the following specific steps:
(1) determining a control point or area of a noise source emitting noise, placing a comparison sensor at the control point, adjusting the direction of a secondary sound source to enable the axis of the secondary sound source to be aligned with the position of the comparison sensor, and adjusting the emission angle of the secondary sound source according to the area of the noise to be controlled to enable the emitted sound wave to cover the noise area to be controlled;
(2) the signal obtained by the reference sensor is subjected to phase shift amplification and related processing by the controller, then is sent to the signal processor for carrier modulation, and then the modulated wave is amplified by the power amplifier to push the infrasound source to emit directional sound waves;
(3) and detecting whether the sound pressure level of the control point reaches a control target by using the comparison sensor, if not, feeding back the signal of the comparison sensor to the controller, adjusting the signal input into the signal processor by using the controller, pushing the secondary sound source by using the power amplifier, and adjusting the sound pressure level of the secondary sound source until the sound pressure level of the control point measured by the comparison sensor reaches the control target.
2. The noise-directed active control method of claim 1, wherein when there is a movement of the noise source, the positions of the comparison sensor and the secondary sound source move synchronously with the noise source.
3. The active control method of claim 2, wherein the infrasound source is directivity-adjusted by phase modulation or mechanical means to realize tracking control of different noise control points.
4. The active control method of noise directivity according to claim 1, 2 or 3, characterized in that the secondary sound source is an active directional sound source designed according to the parametric array principle.
5. The noise-oriented active control method according to claim 4, wherein the secondary sound source is composed of an ultrasonic transducer array, and the oriented transmission of the sound wave of the secondary sound source is realized by transmitting a modulation wave with an ultrasonic signal as a carrier wave and a modulation signal as a noise control signal; wherein, the diameter of the single ultrasonic transducer is 10-16 mm, and the frequency of transmitting ultrasonic waves is 15-120 KHz; all the ultrasonic transducers are closely arranged, the number of the ultrasonic transducers is dozens to tens of thousands, and the shape of the array is circular, hexagonal, rectangular, square or elliptical, or the combination of several shapes.
6. The method of claim 1, wherein the noise is a reverberant sound field, a direct sound field, or a noise field with both reverberant and direct sound fields.
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| CN202011591787.5A CN112669807A (en) | 2020-12-29 | 2020-12-29 | Noise directional active control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113781991A (en) * | 2021-08-20 | 2021-12-10 | 苏州三星电子电脑有限公司 | Noise reduction device, noise reduction method and multimedia equipment |
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