Method and device for generating low-frequency sound wave

A low-frequency sound wave generation device technology, which is applied in the direction of frequency/direction characteristic devices, etc., to achieve the effects of adjustable frequency, stable operation, and easy miniaturization

Inactive Publication Date: 2013-08-14
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The disadvantage is that a large amplitude is required, and the area of ​​the vibrating membrane must be large enough, and its circumference is roughly equivalent to the wavelength of the infrasonic wave, and the energy conversion efficiency of this method is less than

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  • Method and device for generating low-frequency sound wave
  • Method and device for generating low-frequency sound wave
  • Method and device for generating low-frequency sound wave

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Embodiment Construction

[0033] The principle of the method of the present invention is as figure 1 shown.

[0034] The principle of the present invention is: use the high-frequency signal to carry the low-frequency signal, the low-frequency signal modulates the high-frequency signal to obtain a modulated signal, and then obtain the required low-frequency sound wave through the sound wave transducer.

[0035] In the present invention, the low-frequency signal and the high-frequency signal can both be digital signals or both analog signals. The low-frequency signal and the high-frequency signal can be realized by software or by hardware.

[0036] Such as figure 2 Shown is a schematic diagram of an embodiment of the device of the present invention. The frequency, phase, and amplitude of the low-frequency electrical signal generating device 1 can be adjusted, and output low-frequency electrical signals that can be as low as the infrasonic band; the frequency, phase, and amplitude of the high-frequenc...

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Abstract

The invention relates to a low-frequency sound wave generation technology and provides a method and a device for generating a low-frequency sound wave. The low-frequency sound wave is obtained in the manner that a high-frequency electric signal is modulated by using a low-frequency electric signal. A modulating way can be a frequency modulation way, an amplitude modulation way or a phase modulation way and the like. An obtained modulating signal is converted by an energy converter, and thus, a sound wave signal with certain frequency spectrum content can be output, and can be low to an infrasonic wave band. The method for generating the low-frequency sound wave provided by the invention is simple. The device is small in size and low in manufacturing cost. The method and the device for generating the low-frequency sound wave are suitable for low-frequency sound wave research in laboratories and medical science.

Description

technical field [0001] The invention relates to a technology for generating low-frequency sound waves, in particular to a method for generating low-frequency sound waves by modulating high-frequency electric signals with low-frequency electric signals. Background technique [0002] The study of low-frequency sound waves, especially the generation, propagation, reception, influence and application of infrasound waves, has led to the formation of a new branch of modern acoustics, which is infrasound. The generation technology of infrasonic wave is the difficult point in the current research topic of infrasonic wave. Infrasound has been applied in many fields, for example, it can detect the position and size of sound sources such as nuclear explosions and rockets, and study other characteristics, and use the infrasound radiated before natural catastrophic events to predict catastrophic natural events. The atmosphere is continuously detected and monitored, and the characteristi...

Claims

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Application Information

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IPC IPC(8): H04R1/20
Inventor 杨卫新何焰蓝彭刚于晓燕何彪马奇奇
Owner NAT UNIV OF DEFENSE TECH
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