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Active single-direction acoustic propagation device and method for realizing single-direction acoustic propagation

A sound propagation, one-way technology, applied in the direction of the frequency/direction characteristic device, etc., to achieve the effect of simple structure and easy realization

Active Publication Date: 2014-07-23
SOUTHEAST UNIV
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  • Abstract
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Problems solved by technology

In general, in the study of using acoustic media to realize unidirectional acoustic boundaries, corresponding progress has been made in theory, numerical simulation and even preliminary experiments, but the acoustic media involved are still far from the actual realization and application

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  • Active single-direction acoustic propagation device and method for realizing single-direction acoustic propagation
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  • Active single-direction acoustic propagation device and method for realizing single-direction acoustic propagation

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Embodiment Construction

[0022] The implementation process of the present invention is further illustrated below in conjunction with specific examples. It should be understood that this embodiment is only used to illustrate the present invention and not to limit the scope of the present invention.

[0023] Such as figure 1 As shown, the active one-way sound propagation device of the present invention is composed of two loudspeakers and two microphones, and the two loudspeakers constitute a control sound source for sending out sound waves that cancel the reverse sound pressure generated by the external sound source, A reference boundary is set on one side of the control sound source, and two microphones are located on both sides of the reference boundary, and the sound pressure signals measured by them are used to calculate the reverse sound pressure generated by the external sound source, wherein the distance between the two microphones smaller than the wavelength of sound. figure 2is a system sche...

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Abstract

The invention discloses an active single-direction acoustic propagation device and a method for realizing single-direction acoustic propagation, wherein the propagation device is composed of two loudspeakers and two microphones; the two loudspeakers are combined to form a controlled acoustic source; a reference boundary is formed at one side of the controlled acoustic source; the two microphones are located at the two sides of the reference boundary and the space between the two microphones is smaller than the wavelength of the acoustic waves; the two microphones are used for measuring a sound pressure signal of backward sound pressure generated by an external acoustic source; the controlled acoustic source is used for emitting acoustic waves for counteracting the backward sound pressure generated by the external acoustic source. Compared with a single-direction acoustic propagation device structured with a strongly nonlinear acoustic medium, the active single-direction acoustic propagation device is composed of the conventional loudspeakers and microphones, and thus is simple in structure and easier to implement.

Description

technical field [0001] The invention relates to a sound propagation device, in particular to a one-way sound propagation device based on active control. Background technique [0002] A one-way sound propagation device refers to a device in which sound waves can only travel from one side of the device to the other, but cannot pass through in the opposite direction. It has broad application prospects. In terms of acoustic detection of submarines or underwater weapons, the existing methods are mainly divided into two categories: the passive method based on collecting the radiated sound of the underwater structure itself and the active method based on receiving the scattered sound of the structure. The use of one-way sound transmission device can simultaneously suppress the radiated sound and scattered sound, which is beneficial to improve the acoustic stealth performance of underwater structures; the one-way sound transmission device can be installed on the wall surface, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/32
Inventor 韩宁方世良
Owner SOUTHEAST UNIV
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