Broadband one-way voice channel

A sound transmission channel, one-way technology, applied in the direction of sound-emitting devices, instruments, etc., can solve the problem of blocking fluid or large objects from passing through, and achieve the effect of high-efficiency one-way transmission

Active Publication Date: 2015-07-22
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But because there is no non-blocking channel, fluid or large objects are blocked from passing through

Method used

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  • Broadband one-way voice channel

Examples

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Embodiment

[0032] Example: such as figure 1 with figure 2 As shown, the first reflector 1 and the second reflector 2 are isosceles right triangles with a side length of d, and the width of the acoustic metasurface 3 is also d, and the width of the waveguide is a square tube of 2d. Such geometric parameters For the most perfect case, such as figure 2 As shown by the arrows, a sound wave incident on the left side can be completely reflected, while a sound wave incident on the right side can completely pass through the structure.

[0033] Such as Figure 5 to Figure 8 shown, shows the embodiment at the center frequency f 0 Forward and reverse incidence (right and left incidence) sound field strength experiments and simulation results, forward propagation and reverse cut-off phenomena can be clearly observed.

[0034] Figure 9 shows around the center frequency f 0 The energy propagation efficiency T of a certain bandwidth. The figure shows that the reverse direction is basically 0 a...

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Abstract

The invention discloses a broadband one-way voice channel comprising an upper surface and a lower surface parallel to each other. A first reflector in the shape of an isosceles right-angled triangle is mounted on the upper surface. A second reflector in the shape of an isosceles right-angled triangle is mounted on the lower surface. The right-angle sides of the first and second reflectors are located on the upper surface and the lower surface, respectively; extension lines of hypotenuses of the first and second reflectors intersect; the upper surface and the lower surface are both provide with acoustic meta-surfaces, respectively. The broadband one-way voice channel has the advantages that reflecting paths of the first and second reflectors are simply utilized, super-thinness of the meta-surfaces and the abnormal reflection function are ingeniously utilized, full passage is allowed for acoustic beams under geometrically forward incidence, the acoustic beams under reverse incidence are fully reflected, and efficient one-way propagation is finally achieved; a barrier-free passage is formed between the first reflector and the second reflector, allowing fluid or a large object to pass through the barrier-free passage.

Description

technical field [0001] The invention relates to a broadband unidirectional sound transmission channel, which belongs to the field of acoustic devices. Background technique [0002] Traditional one-way sound transmission devices, such as "acoustic diodes", can use the asymmetric sound manipulation effect to realize that sound waves can only propagate in one direction (that is, forward propagation, and reverse cut-off). This conceptual device has potential applications in the fields of noise control and ultrasound therapy. For example, in ultrasonic treatment, it can prevent the interference of reflected sound waves on the equipment and the harm to the human body, or in special noise control occasions, it can ensure that the emitted sound is transmitted, and the external noise cannot be transmitted. [0003] For example, an acoustic diode and acoustic diode detection system (patent number: 201110028240.9) uses the energy band characteristics of phononic crystals to generate f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/18
Inventor 梁彬朱一凡邹欣晔程建春
Owner NANJING UNIV
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