Sound pulse technique is often used in the underwater acoustic measurement, but it has transients, so it can not be used in low frequencies.

脉冲声技术是一种很常用的水声测量技术，但由于脉冲声存在着瞬态过程，严重影响了它在低频下的使用。

youdao

This paper presents a theoretical analysis of the reflection of a sound pulse by the plane interface between the air and an idealized porous medium.

本文在理论上分析球面脉冲声波在空气和理想的多孔性媒质界面上的反射问题。

youdao

This paper studies the determination of datum station with GPS and the computation problems of the sound pulse signal received by the datum station of echo pulse receiver under water.

研究了用GPS测定基阵坐标，分析了水听器基阵所接收到的声脉冲信号的处理。

youdao

The machine that Dr O'Brien and Dr Frazier have designed to get round these constraints consists of a transmitter that sends out a pulse of sound at a frequency of 6 kilohertz, and an array of 52 receivers that collect the reflections from anything buried beneath the surface.

ECONOMIST: Archaeology

The continuous pumping means the patient's pulse is replaced by a constant whir - similar to the sound of a washing machine.

BBC: Image of heart failure