This sound spectrum spans about ten octaves. The top five octaves correspond to acoustic waves-the primordial sound of the universe, just 380,000 years into its existence.
这个声谱约有十个八度的跨度。前五个八度音阶与声波一致——仅存在了38万年的宇宙原声。
These unusual properties generally have to do with manipulating electromagnetic (EM) or acoustic waves; in this case, it is EM waves in the infrared spectrum
这些与众不同的性质一般都与控制电磁波或声波有关；在这种情况下，电磁波是处于红外波段的。
Road traffic noise reducing devices. test method for determining the acoustic performance. part 3 : normalized traffic noise spectrum.
道路交通噪音减弱装置。声性能测试方法。第3部分：正常交通噪音范围。
The spectrum of earthquake and seismic acoustic emissions are analysed with special emphasis.
特别着重分析了地震声发射的频谱。
The acoustic emission regularity and spectrum characteristics of rock under cyclic loading and multi-stage loading during complete failure process were studied.
对循环加载和分级加载条件下岩石损伤破坏全过程的声发射规律和频谱特性进行了研究。
Intubation structure can improve the acoustic performance of mufflers and widen the frequency range of mufflers, but its length must be designed according to the exhaust spectrum.
内插管结构能改善消声器的声学性能，拓宽消声频率范围，但设计它的具体长度需要根据排气频谱来选择。
Studied two conditions of acoustic signals when it was single-phase gas and two-phase flow in the pipeline from sound spectrum, acoustic energy, peak frequency and amplitude.
分别从声波频谱，声波能量，峰值频率，以及幅值等方面对管道内为单相气体和两相流体两种状态下的声波信号进行了研究。
The formulas for calculating spectrum of plane acoustic pulses are obtained by using transfer function. These formulas can be used to evaluate the shift extent of centroid frequency of pulses.
利用传递函数，得到了平面脉冲声波在传播过程中任意位置处频谱的计算方法，用这种方法可以评价脉冲声波的主频偏移程度。
The characteristics of the multi-targets' spatial spectrum in acoustic field is analyzed in the paper, and the adaptive weight suitable to this condition is derived.
分析了声纳多目标背景环境下声场方位谱的特性，并推导了适合此背景的最优自适应权。
The characteristic of linear and nonlinear responses between arc excited ultrasonic emission and excited frequency was realized by the received signal from the acoustic to the ultrasonic spectrum.
对受激电弧的声发射信号分析表明，从音频到超声频带，电弧声发射与激励频率之间存在着线性响应和非线性响应特征。
A new combined Surface Acoustic Wave (SAW) convolver, or a serial searching code acquisition scheme for direct sequence spreading spectrum (DSSS) communication system is presented.
提出了一种用于直接扩频通信系统（DSSS）快速捕获，新型组合声表子波（SAW）卷积器序列搜索码捕获方案。
This paper aims to get enough knowledge of line spectrum in acoustic vector signal and extract as more features as possible so as to improve the recognition-rate of targets.
本文旨在通过以上研究，能够对声矢量信号中的线谱成分有充分的认识和提取到尽可能多的特征，从而进一步提高舰船目标识别率。
The error rate model is one of the key indexes of underwater acoustic spread spectrum communications system.
误码率模型是水声扩频通信系统性能的关键指标之一。
Spread spectrum techniques used in underwater acoustic remote control system were introduced in this paper.
本文对采用扩频技术的远程水声遥控系统进行研究。
Furthermore, the energy density spectrum for electromagnetic wave, Langmuir wave and ion acoustic wave are obtained and used to interpret spectra evolution with time.
研究了电磁波、朗缪尔波与离声波在相互作用中的能量密度谱随时间的演化；
A new method based on Support Vector Data Description (SVDD) was presented to identify and locate line-spectrum power increase acoustic fault source of system.
本文以线谱增强类声学故障为研究对象，提出了一种基于支持向量数据描述(SVDD)的故障源识别定位方法。
Step four: the main frequency spectrum of the acoustic analysis.
步骤四：进行该声波主要频谱的分析。
Step four: the main frequency spectrum of the acoustic analysis.
步骤四：进行该声波主要频谱的分析。
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