Sound diode based on time-dependent modulation

Abstract

The invention provides an acoustic diode based on time-dependent modulation, which is composed of an elliptical cylinder in an acoustic wave tube and a filter located at the end of the acoustic wave tube. Among them, the elliptical cylinder is located in front of the filter, the acoustic wave tube is made of rigid material, the elliptical cylinder is rotated by a motor, and the filter is composed of Helmholtz resonant cavities located on the upper and lower sides of the acoustic wave tube. The structure of the present invention is in the working band. After the forwardly incident sound wave passes through the elliptical cylinder with a rotation speed of 65.5r / s, part of the frequency jumps by 131Hz and can pass through the filter. The reversely incident sound wave first passes through the filter and is directly filtered. off and cannot pass through the diode. The present invention not only realizes acoustic rectification by using time-dependent modulation, but also can change the operating frequency of one-way propagation by changing the structural parameters and filter center frequency, and can change the diode bandwidth by changing the rotation speed and filter bandwidth. It is an angle-independent method. Sensitive, adaptable, simple structure, easy to implement, low-cost acoustic diode.

Description

technical field [0001] The invention belongs to an acoustic diode device in an acoustic system, in particular to an acoustic diode based on time-dependent modulation. Background technique [0002] Diode, also known as crystal diode, is a kind of two-electrode electronic component with asymmetric conductance in electronic components, which only allows current to flow in one direction. Because of its rectification effect, the diode has a wide range of applications. It can be used as a simple DC voltage regulator circuit, temperature compensation circuit, automatic control circuit, limiter circuit, switch, detection circuit, protection circuit in the relay drive circuit, etc., which has attracted the attention of basic science. and advanced technological innovations. [0003] The development of electronic information technology in the last century has greatly changed the appearance of human life and promoted the progress of society. However, as the size of information process...

AI Technical Summary

Problems solved by technology

However, this design structure is too complicated and can only be based on theory, and has not completed the experimental work

These latest research results show that although there are some methods to achieve acoustic rectification, it is necessary to obtain an acoustic diode design with high transmittance, high contrast, insensitivity to angle and intensity, good stability, simple structure, and easy implementation. , still a problem

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