The skull is cetacean-like but its jawbones lack the enlarged space that is filled with fat or oil and used for receiving underwater sound in modern whales.
它的头骨与鲸类相似，但它的下颚骨没有现代鲸鱼用来接收水下声音的、充满脂肪或油脂的扩充空间。
Experiments show that such hydrophone can detect underwater sound accurately.
实验表明：膜片型光纤光栅水听器可准确检测水声信号。
The model of underwater sound warfare impact the viability of ship in formation of ship highly.
水面舰艇编队水声对抗模型的正确与否直接影响到编队内舰艇的生存能力。
The sonar buoy testing system can emulate signal of underwater sound and detect the operating status and performance of sonar buoy.
声呐浮标测试系统能够模拟水下声信号，用以检测声呐浮标的工作状态和性能。
From the point of the view of the communication theory, the ocean, as the media of sound transmission, is called to be underwater sound channel.
海洋作为水下声波传播的介质，从通信论的观点来看，海洋就是声信道。
In this paper, research of acoustic characteristics and developments of underwater sound-absorbing material are surveyed in view of material acoustics.
结合近年来水下目标吸声材料和结构的应用及研究，从材料声学设计的角度，讨论了水下吸声材料的声学特性和研究进展。
This paper describes the principle, construction, performance and error analysis of the standard apparatus for underwater sound pressure in high-frequency range.
本文叙述高频水声声压标准装置的原理、组成、性能和误差分析。
This dissertation developed a set of software for predict the system function of underwater sound channel combined modified HARPO arithmetic and GRAB arithmetic.
本文结合改进HARPO算法和GRAB算法开发了一套水下声信道传递函数预报软件。
As ocean environment is complicated and varied, it makes sound signals strongly distorted and fluctuated during their transmission through underwater sound channel.
由于海洋环境条件的复杂多变，使得声信号在海洋信道中的传递存在着强烈的畸变和涨落。
A method of measuring correlation between signal pulses for the investigation of random time-variant properties of underwater sound channel is presented in this paper.
本文提出一个研究海洋声传输信道随机时变特性的脉间相关法。
To prove the system can be used in underwater acoustooptic communications, with this system, the acoustic frequency and intensity of underwater sound source are detected.
为了证明系统能够应用于水下声光通信，进行了对水下声源发出的声波频率和强度的探测实验。
In this paper, we discussed the underwater sound reverberation of moving medium, which is a non-stationary stochastic process even after compensating its energy attenuation.
本文讨论了运动介质的水声混响过程，在补偿了能量衰减之后，它仍是一非平稳随机过程。
This paper describes the principle, construction and experimental results of the standard apparatus for underwater sound pressure by using the free-field reciprocity method.
本文叙述自由场互易法水声声压标准装置的原理、组成和实验结果。
Based on measuring the cross-spectrum density of sound pressure between two hydrophones, the facility for underwater sound intensity measurement is investigated and designed.
基于双水听器互谱测量法，研制的水声声强测量设备可用于测量水下声源产生的声场中任意点的声强量值或任意面上的声强量值分布。
Investigating the channel of the underwater sound and the effect of the signal detection in it, by utilizing the obtained results, the optimum receiving direction can be chosen.
当研究水声信道和信号在其中的检测效果时，利用本文的结果可以选择最佳的接收方向。
Advantages of power operational amplifier in underwater sound transmitter and problems of power opertional amplifier with reliability and stability in application are described.
描述了功率运放在水声发射机方面的特点，探讨了功率运放在应用中可靠性和稳定性等方面的问题，给出了发射机应用实例。
This paper focuses on the research of the system structure of the synthetic environment of the passive sonar and the modeling and simulation test of the underwater sound synthetic signal.
以水中运动目标为例，给出了水声环境下，合成信号、环境噪声、海洋声学的数学模型和合成环境系统仿真实验。
Abstract: To reduce the fluctuation of frequency response of a Distributed Feedback (DFB) fiber laser used in underwater sound detection, an encapsulated structure with orifices was designed.
摘要：针对分布反馈式(DFB)光纤激光器用于水声探测时频响曲线起伏较大的问题，设计了一种开孔套管式封装结构。
The research result can be applied to the environment simulation of the underwater detecting system and underwater acoustic warfare system, as well as evaluation of the underwater sound equipment.
该研究可用于水下探测系统和水声对抗系统的环境模拟，及水声设备的性能评估。
The effects on the underwater sound attenuation by the thickness and concentration gradient of polymers were measured in a sound tube at different frequency during the polymers dissolution process.
文中详细研究了梯度高分子溶液在不同频率下，聚合物厚度及梯度结构的变化对反射声衰减效果的影响。
Several times during the summer of 1997, the U. S. National Oceanic and Atmospheric Administration recorded an ultra-low frequency underwater sound using U. S. Navy "spy" sensors 3,000 miles apart.
1997年夏天，美国国家海洋大气局使用美国海军“间谍”探测器记录下了一段3000英里外水下的超低频声音。
IN the summer of 1997, an array of underwater microphones, or hydrophones 【 1 】, owned by the US government picked up a strange sound.
1997年的夏天，美国拥有的大量的水下麦克风，或水听器，检测到一种奇怪的声音。
In offshore prospecting a ship tows a sound source and underwater phones. Sound waves are generated by a pneumatic device that works like a balloon burst.
在近岸石油勘查中，勘探船牵引着一个声源以及水下捡波器。一个气动装置发出声波，就象气球爆炸那样。
The proper sound propagation model is the basis of transfer function prediction of underwater acoustical channel.
合适的水声传播模型是水下声信道传递函数预报的基础。
Underwater plasma sound source, namely underwater sparker, is a significant application of pulsed discharge in water, which has been employed for underwater acoustics and sea oil prospecting.
水下等离子体声源是水中脉冲放电技术在水下声学和地震勘探技术方面的一个重要应用，又称为电火花震源。
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。
When we use it to test the underwater target strength, one problem is how to discriminate the direct sound of the source with the echo reflected from the target, finding the target character quickly.
当利用它进行水下目标强度测试时，一个很实际的问题就是怎样区分声源直达声和目标反射回声，快速找出目标特性。
The measurement of radiation noises from an underwater structure body and identification and location of noise sources were carried out by using a sound intensity measurement system .
通过用声强测量系统对水下大型结构体进行了辐射噪声声功率的测定以及噪声源的识别和定位的实验。
The research on air-to-water sound transmission is essential for designing underwater acoustic system to detect airborne target.
设计良好的水下对空声探测系统，需要深入理解空气声波透射入水规律。
In this paper, an experimental study on adaptive active control of sound trans-mission through a finite length water-filled cylinder in underwater is carried out.
本文研究了有限长充水圆柱置于水中，外声场透射形成的腔内声场自适应有源控制实验研究。
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