有些种类的蝙蝠会根据回声频率的变化来调整向猎物移动的方向和速度。
Responding to changes in the CF echo's frequency, bats of some species correct in flight for the direction and velocity of their moving prey.
他分析了鸣叫声的特征，包括每支“曲子”的发音次数——或者说音节、音节的长度以及鸣声频率。
He analysed the songs' traits, including the number of single sounds - or syllables - per song, the length of the syllables and the song's frequency.
该设备还能收听跨越17个八度音阶的声频，其音调范围远高于蚊子的蜂鸣，而远低于低沉的雾角。
It can also hear sound frequencies across a span of 17 octaves, spanning pitches far higher than the whine of a mosquito and far lower than a rumbling foghorn.
这套系统可以对视频和声频记录进行分析以识别人类的姿体语言(比如以特定的方式我摇头)和语音语调(比如音调的高低变化)。
It can analyse video and audio recordings in order to recognise gestures of both posture (moving the head in particular ways, for example) and voice (such as changes in pitch).
色彩与声频手拉着手，带来一副又一副的美丽与完美，这在当前的地球无法寻找。
Color and sound go hand in hand bringing an array of beauty and perfection not found on Earth at present.
利用超声频谱分析法成功地实现了缺陷的分类，试验结果表明，超声频谱分析技术可提高检测结果的可靠性。
Flaw classification is realized successfully through the ultrasonic spectrum analysis. The research proves that ultrasonic spectrum technology will promote the reliability of testing results.
数字水印的研究对象主要包括静止图像、视频和声频信息。
What digital watermarking technique mainly research on is still images, video and audio signals.
影响数字声频质量的主要因素之一是量化噪声。
The quantizing noise is an important factor which influences the quality of digital audio.
切断-边缘大学生音乐技术和声频系统的课程设计和活的绩效技术。
Cutting-edge Undergraduate courses in Music Technology and Audio System Design and Live Performance Technology.
本文在对相位噪声的概念、产生及其相关测量方法研究的基础上，设计出一种低噪声频率变换电路。
This paper presents a new type of low noise frequency conversion circuit based on the research of phase noise conception, generation as well as relativity measurement method.
实验表明：非平稳噪声在时域中是可以识别的，与传统的噪声频域检测方法相比，分辨率有明显的改善。
Simulation results show that non-stationary noise can be identified in time domain and resolution improvement is obvious compared with that of conventional noise detection in frequency domain.
所以通过对冲击噪声频谱的研究，分析产生冲击噪声的瞬时时间与频谱之间的关系是十分必要的。
It is significant to study the spectrum of impact noise and the relation between spectrum of impact noise and transient time length.
通过理论计算和分析确定了噪声频谱图中各噪声峰值对应的噪声源及其传递路径，指明了压缩机降噪的主要目标。
Through theory computation and analysis, the source of noise and transfer paths corresponding to every noise peak value are confirmed, the main aim to decreasing noise is pointed out.
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。
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.
详细介绍了一种用于电子侦察与对抗系统中的宽带、高分辨率、低相位噪声频率合成器。
A broadband, high resolution and low phase noise frequency synthesizer used in electronic detection and electronic countermeasure system is described in detail.
本文讨论了两种已经在船厂船舶建造工艺上应用的声频技术。
In this paper two kinds of acoustic frequency technique which were applied in shipbuilding technology in shipyard are discussed.
声频谱包络的特点和音管的传递函数有相应的关系。
The envelope of sound spectrum is related to the transfer function of bore.
直到目前，人类在次声频段的听力阈值仍没有得到一致的结果。本文综述了这方面的工作，并略详细地介绍了几个有代表性的工作。
In this paper some typical works are introduced in detail to make a review about the human hearing threshold of infrasonic frequencies in which an identical result has not been got up to now.
本文探讨了用齿轮噪声频谱分析来诊断齿轮磨损程度的方法。
This paper introduces the methods of diagnosing the tooth-wear through the spectrum analysis of gear noise.
随着孔隙率、孔径的减小，多孔铝的共振吸声系数有所下降，吸声频谱曲线向低频方向移动，且频带宽度展宽。
When the porosity and pore diameter reduced, the sound absorption curve moved to the low frequency zone and the frequency bandwidth increased at the same time.
声频定向扬声器是利用参量阵原理，产生高指向性声频信号的新一代扬声器。
Audio directional loudspeaker is a novel loudspeaker which can generate an audio signal with high directivity by utilizing the parametric array principle.
该装置由逆变主电路和以arm 7单片机at91 M 55800为核心的测控系统组成。逆变主电路实现了频率和功率均可调的超声频交流电的输出。
This device consists of inverter major circuit and monitoring system based on ARM7 chip AT91M55800. The main circuit produces power supersonic AC output with adjustable frequency and changeable power.
文末对高声频情况下的海底上的声反射系数进行了简化。
In the case of high frequencies, the sound reflection coefficient at sedimentary layer surface is simplified.
探讨利用噪声频谱进行风机故障诊断的方法。
The method for fans fault diagnosis by using noise frequency spectrum was described.
随着SACD的日益普及，同目前流行的电压模高保真功放的性能相比，电流模高保真声频功率放大器将会有美好的发展前景。
As the SACD is increasingly popularized, the current mode power amplifier, compared with the prevalent voltage mode Hi-Fi power amplifier, will have a quick development and bright look in the future.
结合岩心砂泥岩频散特性实验结果分析了岩心在饱水及干燥状态下声频散的特点。
Based on the results of dispersion experiments on cores of sand and shale, the paper analyzed the variability of acoustic dispersion for dry and water-saturated cores.
自从2001年年末，他骑着巴拉达乐的摩托车消失在坎大哈山林中以后，他一直没有在视频中出现，也没有发布过可经考证的声频信息或书面信息。
He has appeared in no videos and issued no verifiable audio messages or written statements since he disappeared into the Kandahar mountains on the back of Baradar's motorcycle in late 2001.
自从2001年年末，他骑着巴拉达乐的摩托车消失在坎大哈山林中以后，他一直没有在视频中出现，也没有发布过可经考证的声频信息或书面信息。
He has appeared in no videos and issued no verifiable audio messages or written statements since he disappeared into the Kandahar mountains on the back of Baradar's motorcycle in late 2001.
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