新的导管周围低回声信号到底代表什么？
水下目标回声信号的检测是主动声纳目标识别的重要内容。
Detection of echo signal is an important part of underwater object recognition.
灰阶超声由于低回声信号不易为人眼识别，甚至有用信息丢失。
Because it is not easy to distinguish low signal of grey scale ultrasound by eyes, useful signal loss may happen.
本例用来说明复时谱在具有回声信号测量中的应用，这是数字信号处理的前沿课题之一。
In this case when used to describe the complex spectra with echo signal measurement, which is the forefront of digital signal processing one of the topics.
同时重点介绍了DDS技术，并以结构复杂的地层回声信号为例介绍了信号模拟器的基本原理及构成。
The DDS technique is mainly described, and the basic principle and the composition of the signal simulator are introduced with a complex structure strata echo signal.
回声定位蝙蝠由于其听觉系统的特殊性及重要性，可以反馈地调节后继所发声信号的声学特征。
For the particularity and importance in auditory system of echolocating bats, they can modulate the following vocal features in feedback way.
回声定位蝙蝠由于其听觉系统的特殊性及重要性，可以反馈地调节后继所发声信号的声学特征。
For the particularity and importance in auditory system of echolocating bats, they can modulate the following vocal features in feedback way.
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