Sound diode based on time-dependent modulation

Abstract

The invention provides a sound diode based on time-dependent modulation. The sound diode is composed of an oval pillar in a sound wave guide tube and a filter located at the tail end of the sound wave guide tube. The oval pillar is located in front of the filter and the sound wave guide tube is made of rigid materials. The oval pillar is driven by a motor to rotate and the filter is composed of Helmholtz resonant cavities which are located on the upper side and the lower side of the sound wave guide tube. In terms of the sound diode based on time-dependent modulation, in the working wave band, after sound waves which enter in the forward direction pass through the oval pillar which rotates at the speed of 65.5r / s, part of the frequency jumps to 131Hz and the sound waves can pass through the filter. Sound waves which enter in the backward direction pass through the filter at first and are directly filtered and the sound waves can not pass through the diode. According to the sound diode based on time-dependent modulation, sound rectification is achieved through time-dependent modulation and the working frequency of single-direction transmission is changed by changing the structural parameters and the center frequency of the filter. The bandwidth of the diode can be changed by changing the rotation speed and the bandwidth of the filter. The sound diode is not sensitive to angle, high in adaptability, simple in structure, easy to obtain and low in cost.

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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