Method and device for generating low-frequency sound wave

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...

AI Technical Summary

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 1%.

At present, there is no low-frequency sound wave generating device that modulates high-frequency electric signals with low-frequency electric signals to generate low-frequency sound waves, miniaturization, and simple structure (frequency can be as low as infrasound)

Images