Method for measuring direct wave signal sound pressure of sound wave transmitted in limited regional medium

Abstract

The invention provides a method for measuring direct wave signal sound pressure of sound wave transmitted in a limited regional medium, which comprises the following steps: 1) firstly, laying a transmitting point and a receiving point in a limited region of the medium, fixing the distance between the two points, and starting acquiring sound pressure signals transmitted by the transmitting point after the transmitting point produces continuous pulse wave with certain pulse width and the receiving point forms a stable sound field in the limited region of the medium; 2) then, re-laying the transmitting point and the receiving point in the limited region of the medium, keeping the relative distance between the transmitting point and the receiving point unchanged, repeating the operation of the previous step for M times, and acquiring sound pressure of M signal waves by the receiving point; and 3) finally, synchronizing and then overlaying the M signals acquired by the receiving point, and averaging the overlapped waveform to acquire the required direct wave signal sound pressure. Even if sound interference of same frequency reflection exists in the limited region of the medium, the method can extract the direct wave more 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

Images