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Directed sound field adjustment and control method based on wave beam deflection

A sound field and beam technology, which is applied in the field of sound field control based on plane wave beam forming, can solve the problems of unable to realize omnidirectional energy field and weakening.

Active Publication Date: 2019-03-08
ZHEJIANG UNIV +1
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AI Technical Summary

Problems solved by technology

Due to the principle of energy conservation, the active sound field control technology cannot realize the weakening of the omnidirectional energy field, and there is a fluctuating effect of the sound field in a large space range, such as the far field condition

Method used

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  • Directed sound field adjustment and control method based on wave beam deflection
  • Directed sound field adjustment and control method based on wave beam deflection
  • Directed sound field adjustment and control method based on wave beam deflection

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] refer to Figure 2 ~ Figure 4c , a sound field directional control method based on beam deflection, the implementation method for sound field directional control to realize sound energy redistribution is as follows:

[0023] 1) Acquisition of sound field information of the controlled sound source;

[0024] First, the sound pressure signal of the controlled sound source is received through the distributed hydrophone nodes arranged in the sound field collection area, and the frequency f, amplitude and phase information of the controlled sound source are extracted according to the received information, and the near and far field sound Propagation characteristics, reconstructing the controlled sound source as a point source as s 0 (t).

[0025] 2) Sound field directional control;

[0026] The active control sound source and the controlled sound source are combin...

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Abstract

The invention discloses a directed sound field adjustment and control method based on wave beam deflection. The method comprises the following steps: 1) collecting sound field information of a controlled sound source, and using the collected information for sound source reconstruction; and 2) constructing an objective function on the basis of the idea of wave beam deflection, obtaining an adjustment and control weight vector through solving the objective function optimization problem, and realizing directed sound field adjustment and control after driving to an active control source. Accordingto the method, the controlled sound source is regarded as an emission sound source, and is combined with the active control sound source to form an "emission array", the active control source emits awave beam for driving to align a maximum recessed area of the wave beam to a to-be-suppressed sound field direction, thus maximum sound field cancellation under multi-row acoustic interference is realized in the direction, and the purpose of directed sound field adjustment and control is achieved. The technology has a potential application value in the fields such as directed low-frequency soundhiding.

Description

technical field [0001] The invention belongs to the field of underwater sound field regulation, and in particular relates to a sound field control technology based on plane wave beamforming, which suppresses the sound field intensity in a specific direction of a controlled source by regulating the amplitude and phase of an active control source. Background technique [0002] With the development of noise control technology, more and more attention has been paid to the control of low frequency and local sound field. Some technologies have become increasingly mature in the fields of automotive noise control and earphone active noise reduction, and research in the field of underwater stealth has also attracted increasing attention. [0003] The sound field linear control technology usually achieves the purpose of weakening the local sound field intensity of the controlled sound source by presetting the amplitude, phase and frequency of the active control sound source, and using...

Claims

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Application Information

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IPC IPC(8): H04R1/32H04R1/44
CPCH04R1/32H04R1/44
Inventor 李建龙张贤李鋆何元安闫孝伟向平
Owner ZHEJIANG UNIV
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