Method for measuring the sound pressure of direct wave signals with sound waves propagating in media with limited area

Abstract

The invention provides a method for measuring the sound pressure of a direct wave signal in which the sound wave propagates in a medium with a limited area, comprising the following steps: 1) First, lay out a transmitting point and a receiving point in a limited area of ​​the medium, and fix the distance between the two points When the transmitting point produces a continuous pulse wave with a certain pulse width, the receiving point forms a stable sound field in the limited area of ​​the medium, and then starts to collect the sound pressure signal emitted by the transmitting point; 2) Then, re- Arrange the transmitting point and receiving point, and keep the relative distance between the transmitting point and the receiving point unchanged, repeat the operation of the previous step, and repeat the operation M times, and the receiving point collects the sound pressure of M signal waves; 3) Finally, the receiving point The collected M signals are synchronized, then superimposed, and the superimposed waveforms are averaged to obtain the required sound pressure of the direct wave signal. With this method, even if there is acoustic interference reflected by the same frequency in a limited area of ​​the medium, the direct wave can be extracted relatively easily.

Description

technical field [0001] The invention relates to a sound field signal and information processing technology, in particular to a method for measuring the sound pressure of a direct wave signal that does not need to consider the influence of boundary reflections when the sound wave propagates in a limited area medium. Background technique [0002] 1. Propagation of sound waves in a limited area medium [0003] When the sound wave propagates from one medium to another, due to the difference in sound velocity and density in different media, the sound wave will be reflected and refracted on the interface of the medium. In a limited area with a certain distance in the medium, the sound wave propagates from one point to another point, the first point is defined as the emission point, and the second point is the reception point. The sound waves emitted by the transmitting point and directly reach the receiving point are called direct waves. The wave that reaches the interface of th...

AI Technical Summary

Problems solved by technology

[0019] (3) Acoustic and electrical interference with the same frequency as the signal

However, it is impossible to expand the limited area of ​​the medium that can meet the above requirements in practice, and it is difficult to realize it technically and economically.

Therefore, by using pulse measurement technology to eliminate the same frequency acoustic interference, as the frequency continues to decrease, its feasibility and effectiveness will gradually decrease to the eventual failure

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