查询词典 dimensional sound

In addition, our agent produced by the Group of Portugal AMORIM only WICANDERS Kang cork wall panels, cork flooring and cork flooring IPOCORK; Republic of Korea DISEVEN polyester fiber sound-absorbing panels decorative arts; wooden sound-absorbing panels, wood wool sound-absorbing panels, sound-absorbing cloth, and other high-quality sound-absorbing panels Materials, in our pursuit of

另外，我公司代理葡萄牙AMORIM集团生产的WICANDERS唯康软木墙板、软木地板及IPOCORK益步高软木地板；韩国DISEVEN聚酯纤维吸音装饰艺术板；木质吸音板、木丝吸音板、布艺吸音板等优质吸音材料，我们本着追求卓越，永无止境的精神，务实求新，诚实信用的态度，愿与广大朋友携手共创美好未来。

Exhibition hall is divided into four, nine galleries, one of electric and magnetic layer for the area, power and machinery area, math section, the universe and Space Pavilion, set up a high-voltage discharge, electric magnetic Gallery, bowls, a typical mechanical transmission, three-dimensional coordinates and other exhibits; the second floor for the sound and light booth, Applied Technology Pavilion, set up a light display, three-dimensional holographic images, sound simulation, laser laser, simulated driving and other exhibits; three for the Life and Health Pavilion, set up a false impression cylinder, fitness tests, brain and facial features, body systems, such as exhibits; underground floor for temporary exhibitions; in the Office of the Hebei Academy of Sciences set up a pavilion style.

展厅共分四层，九个展区，其中一层为电与磁展区、力与机械展区、数学展区、宇宙与航天展区，设置了高压放电、磁电廊、滚球、典型机械传动、三维坐标等展品；二层为声与光展区、应用技术展区，设置了光路展示、全息立体影像、声音模拟、激光内雕、模拟驾驶等展品；三层为生命与健康展区，设置了错觉滚筒、体能测试、大脑与五官、身体各系统等展品；地下一层为临时展览；中厅设置了河北院士风采展区。

On the basis of investigating the sound field of a plane piston transducer and the relations between sound field and radiation force, by settling four plane piston transducers driven at the same frequency at each corner of a regular triangular pyramid with their sound-beam axes crossing at the center of the pyramid, this technique uses ultrasonic wave synthetic theory to acquire a three-dimensional ultrasonic standing wave field. The micro-component can be captured, transported, released in the range of space by adjusting the phase of the transducers.

在研究单个圆形平面活塞换能器声场分布以及声场和辐射力关系的基础上，将以相同频率驱动的4个平面活塞换能器呈正四面体放置，利用声波合成原理获得三维超声驻波场，通过调整各个换能器发射信号相位之间的关系实现对微构件在空间范围内的俘获、移动、释放等操纵。

ISA itself many times "3D audio" sound card, but the ISA sound card interface smaller bandwidth, and its three-dimensional sound processing and playback ability to very limited.

ISA时代有不少标榜"3D音效"的声卡，但由于ISA接口声卡的带宽较小，其处理和回放三维音效的能力十分有限。

Testing and investigation of Sound Absorption Coefficient and Sound Attenuation show sound-absorbing wool materials have excellent sound absorption properties.

通过对羊毛吸声材料的吸声系数与声衰减能力的测试，发现其吸声性能优良。

And the wall of test workshop is completely paved with 25mm thickness stainless steel perforated acoustic panel, 50mm cavity; using the sound lock double sound insulation door, the sizes are 2.4×1.64 m、2.149×1.04 m respectively; Double layer 3×8 mm thickness bulletproof glass sound insulation window, 50mm cavity; air inlet uses dissipative muffler, the size is 5×3×2 m, sound splitter is 150 mm thickness stainless steel protective facing.

试车间墙面满铺25 mm厚不锈钢穿孔吸声板，50 mm安装后空腔；采用声闸双重隔声门，尺寸分别为2.4×1.64 m、2.149×1.04 m；双层3×8 mm厚防弹玻璃隔声窗，50 mm空腔；进风口选用阻性消声器，尺寸为5×3×2 m，消声片为150 mm厚不锈钢护面。

Based on a series of signal process and noise source identification techniques, especially the major noise source identification methods, such as expurgation method, sound intensity analysis, spectrum analysis vibro-acoustic correlation analysis and so on, the pass-by noise control of SC7080A and SC6360B are studied in detail. By the roadway and dais experiments, the major noise and radiating parts are identified and some economical controlling methods are made. For the SC7080A, to control the emissing noise from the intake and shell vibration of air cleaner, a intake muffler is installed between the air cleaner and intake valve. Based on the theory of Helmholtz resonator, One three-parallel-connected resonant silencer is designed and trial-manufactured. For the SC6360B, the attenuation performance of exhaust muffler in high frequency region is improved. To reduce the vibration noise of shell part, the structure of oil sump tank, exhaust manifold shield and exhaust manifold shield are analyzed and improved. At the same time, some measures, such as sound absorption, sound insulation, are taken to reduce the noise of engine surface emissivity and a sound shield is designed.

本文首先综述了目前国内外汽车加速噪声控制的现状、主要方法和技术措施，在此基础上，结合SC7080A和SC6350B汽车的车外加速噪声水平及现状，综合运用分别运行法、声强法、频谱分析法、声振相干函数法等现代噪声源识别方法，对SC7080A和SC6360B汽车进行了准确详细的车外加速噪声源识别并提出了经济可行的控制方案，针对SC7080A，主要在空气滤清器和进气阀门之间的进气管道上加装进气消声器，抑制空气滤清器壳体表面和进气口两处的噪声辐射，根据Helmholtz共振腔原理设计了三腔并联旁支型共振消声器，并进行了工程化设计和试制；针对SC6360B，主要改善了排气消声器在高频段的消声性能，对罩壳类零件进行了结构改进，降低了其表面噪声的辐射，并对发动机舱进行了吸声、隔声处理，设计了发动机隔声罩。

Firstly, a signalized point is stuck on a moving object to be tested, a microphone array and two video cameras are arranged, and the video cameras are demarcated to obtain a projection matrix; sound pressure signals of a sound source in the moving object to be tested are obtained by the microphone in an array mode, the dynamic video of the moving object to be tested is obtained and disassembled into an image by the video cameras; the signalized point on the moving object to be tested is identified in the video image and the matched signalized point is treated with three-dimension reconstruction to obtain the spatial location of the moving object to be tested; the sound pressure signals are treated with beam forming treatment to obtain a sound field characteristic function scattergram of the moving object to be tested, the video image is treated with spatial coordinate superposition frame by frame and restored into a dynamic video image.

首先在被测运动物体粘贴标志点，布置传声器阵列和两台摄像机，对摄像机进行标定，得到投影矩阵；传声器阵列获取被测运动物体中声源的声压信号，摄像机获取被测运动物体的动态视频，将动态视频拆解成图像；在视频图像中识别出被测运动物体上的标志点，对匹配后的标志点进行三维重构，获取被测运动物体的空间位置；对声压信号进行波束成型处理，得到被测运动物体的声场特征函数分布图，将其视频图像进行逐帧空间坐标叠加，并还原成动态视频图像。

Occasionally like to play classic DOS games under the friends may have PCI sound cards can not be normal in the DOS sound issues, this is because DOS is not compatible with the original IRQ, DMA interrupt, resulting in PCI sound card can not support by the Sound Blaster standard design procedures.

喜欢偶尔玩一下DOS下经典游戏的朋友可能会遇到PCI声卡在DOS下无法正常发声的问题，这是因为在DOS下不兼容原来的IRQ、DMA中断，导致PCI声卡无法支持按Sound Blaster标准而设计的程序。

"Subaudible, low frequency sound and infrasound from wind turbines do not present a risk to human health" and "a major cause of concern about wind turbine sound is its fluctuating nature; some may find this sound annoying, a reaction that depends primarily on personal characteristics as opposed to the intensity of the sound level."

"低频声和风力发电机发出的声音都不会对人类健康造成伤害""人们关注风力发电机声音最主要的方面是它的波动性，有些人很讨厌这种声音。这种反应主要取决于每个人的性格原因，而不是声音的强弱度。"

The products use pure materials (aluminum hydroxide, hydrochloric acid) are made with advanced technology.

聚合氯化铝是一种新型高效的无机高分子混凝剂，本产品选用纯净原料以先进工艺制成。

One reason is that both still have bulging order books with production backlogs that will take years to work through.

原因之一是这两家制造商仍拥有着越来越多的订单量，这些产品订单足以用上几年才能完成。