查询词典 sound frequency

Methods The mitral (M1) and tricuspid (T1) valves componented of the first heart sound (S1), the aortic (A2) and pulmonary (P2) valves componented of the second heart sound (S2) were detected by short-time Fourier transformation spectrogram and Shannon engergy, in the high frequency resolution circumstance.

在频率分辨率较高的情况下，利用短时傅立叶变换声谱图和香农能量，提取出第1心音(S1)的主要成分二尖瓣关闭音(M1)、三尖瓣关闭音(T1)及第2心音(S2)的主要成分主动脉瓣关闭音(A2)、肺动脉瓣关闭音(P2)。

One of the most common ways to describe a wood's tonal properties is in terms of its frequency range,which is often broken down into low-end frequencies,mid-range and high-end frequencies.picture it as a visual spectrum,as we've done in the chart to the right,with the lower frequencies on the left and the higher frequen-cies on the right.the graph line for each wood visually depicts its general tonal range.rosewood and ovang kol,for example,tend to resonate with more low-end frequencies,whereas koa,cocobolo and maple tend to sound brighter from having more top-end frequencies.note also rosewood's"scooped"midrange and ovang-kol's fuller midrange.the doted lines for walnut and koa denote the expansion of low-end frequency range as the guitar opens up after a period of playing it.

最常见的方式描述了木材的声音特性是在其频率范围内，这往往是细分为低端频率，中端和高端frequencies.picture它作为一个视觉频谱，因为我们'维生素E这样做的图表，以权，以较低的频率在左边和更高的频率，种上right.the图线的每一个木材视觉描绘的一般音调range.rosewood和ovang科尔举例来说，往往会产生共鸣更多的低端频率，而兴亚， cocobolo和枫树往往从健全光明有更多的高端frequencies.note也花梨木的&收购&的中端和ovang -科尔的充分midrange.the doted线的核桃和兴亚指扩大低端频率范围内的吉他开辟了一段时间后，打它。

Frequency modulation; frequency processing; echolocating; odontocete cetaceans; ultrasound; bioacoustics; sound localization; midbrain; binaural; mesencephalon; auditory cortex; clicks; auditory evoked potentials; inferior colliculus; superior colliculus

调频；频率处理；凭回声定位的方向；odontocete cetaceans；超声；生物声学；声源测定；中脑；两耳的；中脑；听觉皮层；棘爪；听觉诱发电位；下丘；上丘

One, serve as a signal generator with computer, the software of COOLEDIT of sine sound wave that produces a standard is software of the acoustic frequency processing with a kind of powerful function and editor, it can be generated, broadcast the voice that with transcribe we need, the weaveform that can show phonate news undertakes study for us, be acoustics research and acoustic frequency processing

一、用电脑作为信号发生器，产生标准的正弦声波COOLEDIT 软件是一种功能强大的声频处理和编辑软件，它可以生成、播放和录制我们所需要的声音，并可以显示出声音的波形供我们进行探究，是声学探究和声频处理的得

A Reflectional radio receiver also called a reflex radio is a radio receiver design in which the same amplifier is used for both the high-frequency radio RF and low-frequency sound AF signals .

一个来复收音接收机是这样一种收音机，它的放大器同时用来对高频信号和低频信号进行放大。

In this text,according to home and abroad scholars's study on design of sonochemical reactor and parameters of ultrasound cavitation, I designed the sonochemical reactor cohered with transducers on its side wall, and study cavitation field and ultrasound field distribution by changing power and frequency ,and made research in absorption of different power and frequency ultrasound traveling in water, and especialy study the cavitation with different sound intensity.

笔者综合国内外学者关于声化学反应器的设计思路，设计了侧壁黏结换能器清洗槽式声化学反应器，改变频率定性测量反应器中的声场和空化场分布，研究不同频率的超声在水中传播的吸收情况、声空化和声压或声强的关系以及一定频率的超声在水中的有效空化范围。

The cavity depth of the structure changed gradually from 70mm to 140mm. The structure has wide frequency range and low frequency absorbing characteristic, can be useful to absorb the diffracting sound over the top structure.

这种结构空腔深度为70mm~140mm，空腔截面逐渐变化，具有吸收低频及宽频带噪声的特点，可以更好吸收顶部绕射声。

Speakers import modules with a combination of : titanium membrane Treble, and with fiberglass trumpet, better high frequency extension stronger sense of space; Bass modules using imported pulp Senate carbon fiber, rigid speaker cone greatly strengthened, the effective bandwidth within a more flat frequency response and bass modules using aluminum frame and aluminum wire voice coil. Shaker skeleton of the United States military material, light weight, high efficiency, so that the audio sound pressure increased significantly. more males, bass magnetic circuit using high efficiency of the cooling system to ensure that the speakers have very good heat dissipation, reduce distortion, effectively reduce the power to the compression.

跟进口喇叭单元的结合：采用钛膜高音，配以玻璃钢号角，使高频得到更好的延伸，空间感更强；低音单元采用进口纸浆参碳纤维，纸盆刚性大大加强，在有效的频宽内有更平坦的频率回应，低音单元采用铝盆架和铝扁线音圈，音圈骨架为美国军事物料制造，品质轻，效率高，使音频的声压大幅度提高，更具爆发力，低音磁路采用高效率的冷却系统，保证了扬声器有很好的散热，减少失真，有效降低功率的压缩给。

Chapter seven studies the methods of finding resonance frequency of centrifugal worm housing, analyses the relationship between the sound radiation of fan and wheel tip velocity index under different worm housing sound impedance and a new noise control method is presented for centrifugal fan.

第七章，研究了离心风机蜗壳基频共振频率及高阶模态频率的确定方法，分析了蜗壳声阻抗及其对叶轮声辐射轮缘速度指数的影响，为风机的降噪提供了一种新的途径。

Dust removers have been installed for boilers in many thermal power plants.The sound pressure levels of low frequency noise and infrasonic sound at workplaces were measured.

由于许多火力发电厂锅炉安装了吹尘器，为了解它运行中的低频噪声和次声在工人工作场所的水平，我们对现场进行了测试。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。