查询词典 noise-power-ratio

Meanwhile, this paper analyzed and compared the frequency spectrum andintensity radiated of the 1/3 octave band of the tire tread patterns' noise whichwas measured from different direction in the laboratory, and find out that tirepatterns noise is similar to the sound of loudhailer and has strong directivity.

同时，本文还对在室内不同方位所测得的轮胎花纹噪声1／3倍频程的频谱图与直方图进行了分析、比较后发现轮胎花纹噪声的发声类似扬声器发声，有极强的指向性，一点测试会导致轮胎方案排队择优上的困难，为此，提出了一种全方位测定声级的方法，拟定了测试规范，实验证明行之有效。

Noise model using M series as the input signal of the noise model.

号，给出了噪声模型的最小二乘类参数辨识方法。

To meet the special needs of the market, enterprises have introduced advanced international level of imports of production lines to meet for the washing machine, matching the types of precision motors and low noise, high accuracy, no noise boutique bearing requirements.

为满足市场特殊需要，企业引进了具有国际先进水平的进口生产流水线，满足为洗衣机、精密电机配套的各类低噪音、高精度、无杂音的精品轴承的要求。

MF - 250 (811) is grinding machine series, used car bean pulping ideal processing equipment, instead of the low efficiency of millstones and noise, pulp mill, the poor quality of steel products of our company with small noise, plasma mass flexible, convenient operation and maintenance, adjusting thickness is simple, without foundation installation, etc.

MF-250(811)系列磨浆机是目前辆用于米制品，豆制品制浆最理想的加工设备，代替了效率低的石磨和噪声大，浆质差的钢磨，本公司的产品具有噪音小，浆质柔性好，粗细调节方便、操作维修简便、无需基础安装等优点。

Experiment results show that the mechanical-thermal noise coming from the structure and the mechanical performance of a heavily doped Si membrane is the main noise of the device, which can be reduced by minishing the membrane area and extending the membrane thickness to increase the mechanical resonant frequency of the membrane, but should be at the price of reducing the sensitivity of the device.

Hz(上标 1/2)/W。实验表明，器件的噪声中热机械噪声为主要噪声源，大小主要由浓硼硅薄膜的机械性能和器件结构决定，可以通过增大薄膜厚度，减小薄膜面积，从而增加薄膜的特征频率的方法来减小器件受外界振动的影响，但以降低器件的灵敏度为代价。

This article has introduced noise reduction principles and methods, formation mechanism of vehicle exhaust noise, sorts of vehicle exhaust mufflers.

本文系统介绍了噪声控制的方法，汽车排气噪声的产生机理以及车用排气消声器的种类。

MELP vocoders utilize mixed pulse and noise as the excitation to elimate the buzzes in traditional LPC vocoders, and add a jitter voicing state to overcome the tonal noise.

MELP声码器采用混合脉冲和噪声激励解决了经典LPC的嗡嗡声的问题；引入了抖动浊音状态以克服音调噪声；利用参数插值、脉冲散布和自适应谱增强等措施提高合成语音的自然度和可懂度；此外还采用了多带激励，使其具有了比较强的抗背景噪声的性能。

With infrared LEDs, it can provide surveillance even in total darkness. Proprietary noise reduction further increases picture quality by eliminating noise in low light. A 3.8 to 9.5 millimeter varifocal lens allows installers to adjust the field of view to suit each scene.

同时，SIR-4150采用了独特的解决方案，即使在夜晚微光的状态下，同样可以有效降低噪音，使得画面更真实自然。。A3.8mm-9.5mm系列自动调焦镜头可以随时根据视角的变化调整安装位置。

The analysis included the principal of oscillator , the selection of the topology, the characteristic of some frequently-used LC VCOs and some design tips on designing inductors and varactors, the model of phase noise of Leeson and Hajimiri ,estimation of phase noise ,etc.

然后论文对开关电容调谐的LC VCO设计理论进行了详细的分析，包括振荡器工作原理、VCO性能指标、VCO常用结构、片上电感和变容管的相关理论、开关电容调谐理论、Leeson和Hajimiri相位噪声模型，相位噪声估计等。

Among these four varactors, two of them are fabricated on n-well and use the p-n junction between n-well and substrate to isolate substrate noise. The other two are fabricated on p-well and surrounded by deep n-well and n-well in order to isolated substrate noise.

这四种变容器中，其中两种生成於n型井上且利用介於n型井与基体的p-n接面隔绝基体杂讯；另外两种生成於p型井上且被深层n型井与n型井所包围以隔绝基体杂讯。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。