频带

The computational complexity has been reduced about 5 times over against the original one. Moreover, the interpolation and quantization processing of CW is more reasonable; 2. A secondary power normalization algorithm is proposed in this dissertation. This normalization algorithm ensures that the energy sum of SEW and REW is 1. So, the energy ratio of SEW and REW can be achieved only by using SEW energy. This ratio is applied in REW quantization and CW composition; 3. For more efficient quantization for Slowly Evolving Waveform magnitude, Rapidly Evolving Waveform magnitude and power parameters, firstly, by applying the Equivalent Rectangular Bandwidth theory, classifiable multi-codebooks method, analysis-by-synthesis approach and so on, a predictive AbS multi-codebooks SEW magnitude quantization scheme is proposed. In the scheme, pitch information is exploited to determine which codebook is searched; secondly, for REW magnitude quantization, this dissertation proposed a DCT-matrix multi-codebooks quantization scheme. The classification in muti-codebooks is based on pitch and quantized SEW power. The multi-codebooks structure may offer more the information in quantization and solve the problem of the bit requirement limits in quantization by consuming some extra storage space; Furthermore, for the switch quantization of CW gain, a new classified parameter is proposed.

本文的主要贡献体现为如下几方面：一、为了减少WI模型的计算复杂度，提出了基于快速傅立叶变换、三次B样条插值和周期延拓技术的特征波形(Characteristic Waveform，CW)表示和对齐的快速算法，与原方法相比，计算量下降到原方法的1/5，同时也使得CW在插值和量化时更合理；二、为了严格保证SEW与REW的能量和为1，提出了一种特征波形的二次功率归一化算法，仅需要SEW能量就可以算出二者的能量比，并可应用到后续的REW的分类量化和CW合成中；三、为了对慢渐变波形(Slowly Evolving Waveform，SEW)幅度、快渐变波形(Rapidly Evolving Waveform，REW)幅度和特征波形功率进行有效量化，本文首先采用临界频带理论、分析合成技术、感觉加权技术以及预测式矢量量化技术，提出了一种基于基音周期分类的SEW分析合成预测式多码书量化方法；其次，本文根据基音和量化后SEW的功率信息对REW幅度进行分类，提出了一种基于离散余弦变换的REW矩阵多码书量化方法。

In this case the sound, which emerges beyond the framework of frequency band, which corresponds to human voice, is filtered, and user hears against the background music purified and improved speech of collocutor.

在这种情况下，健全的，其中出现超越的框架内，频带，相当于人类的声音，过滤，用户听到反对的背景音乐，纯化和改进的讲话collocutor 。

Low-frequency covibration experiments of four kinds of fluid-saturated feldspar sandstones which have different viscosity coefficients respectively were conducted so as to know how fluid viscosity coefficient influences attenuation, modulus and velocity dispersion in fluid-saturated sandstone.

为了探讨孔隙流体的黏滞系数对饱和砂岩的衰减、模量和速度色散的影响，本文进行了四种不同黏滞系数的饱和长石砂岩的低频共振实验，结果发现在0.01～10Hz频带范围内，无论是衰减温度话还是衰减频率谱，都显示出衰减随黏滞系数的增大成良好的线性增长关系，黏滞系数越大楼量越大；同时还具有明显的模量与速度色激，而且随着黏滞系数的增大，模量与速度色权有增强的趋势。

This algorithm constructs a 64-D crossband vector according to the characteristics of the decomposed image, and adopts nonlinear interpolative vector quantization and soft computing based codebook generation algorithm. Hence, this algorithm can improve the vector quantization performance significantly from both aspects of speed and precision, and it can get a high reconstruction quality (PSNR＞34dB) with a very low bit rate (0.172bpp).

该方案依据图象小波变换的特点构造了64维的跨频带矢量，并采用了非线性插补矢量量化和柔性计算码书生成算法，从速度和精度两方面提高矢量量化的性能，从而在极低比特率的条件下(0.172bpp)获得了高质量的重构图象(PSNR＞34dB)。

All these characteristics can extend frequency band , reduce antennaelectric size and improve impedance characteristics. In order to miniaturization ofantenna, impedance complete compensate and matching optimization of electricallysmall antenna are brought forward, and this method is applied to the discage antennas.

从阻抗特性和辐射特性的实测数据表明，水加载单极振子天线的谐振频率能很好地向低端下移，局部水加载单极圆锥天线在保持原有宽频带特性的前提下，以较少的效率损失实现了较大范围向低频区扩展，即天线小型化，这将为短波超短波波段天线进一步的小型化设计提供很好的思路。

Through the above discussment, we can conclude that in the thickness of top coal detection,elastic wave method is effective. If the focal satisfy the requirment of the frequency bnak and we take some measures on the emit and receive equipment and use advanced signal analysis method -wavelet analysis ,we can obtain ideal result .

以上工作表明，应用弹性波方法对顶煤厚度探测是切实可行的，只要震源满足频带要求，发射和接收装置采取相应的措施，再结合先进的信号处理方法—小波分析，煤厚探测是可以取得比较理想的效果的。

Research and analysis were carried on frequency spectrum characteristics of loaded coal 's EME during deformation and fracture process.

对受载煤体变形破裂时电磁辐射的频谱特征进行了研究分析，研究结果表明，在受载煤体变形破裂过程中电磁辐射的频带很宽，其主频段随载荷的变化而发生变化，在受载初期，电磁辐射的主频带较低，电磁辐射主频带有时呈现先增高而后降低的趋势；在受载后期，电磁辐射的主频带较高，基本上表现为载荷越大，电磁辐射的主频段越高。

The extrinsically electromagnetic loss of 3-dimentional structures was proved by the comparative measurement of parameters between 3DRCs and their same composition disks and exhibited high-temperature and wide frequency characteristics, which was found closely related to their nature materials. The extrinsically loss was higher in magnetic 3DRCs than that of nonmagnetic ones.

通过与同质陶瓷压片的电磁参数对比，证实了三维连通网络结构存在非本征电磁损耗，且这种非本征电磁损耗具有耐高温和宽频带特性，损耗的大小与网络骨架的材质有关，磁性网络陶瓷的非本征电磁损耗比非磁性的大。

By using the lightning current's expression recommended by IEC1312-1, we calculate and analyze the electromagnetic field near the lightning channel, and discuss the influence of the electromagnetic field distribution due to the finitely conductive ground.

对IEC1312—1中推荐的雷电流表达式进行了频谱分析，发现其代表的雷电流的频带很宽，但雷击释放的能量主要集中在低频部分。

The West Yunnan area is a hotspot for geodynamical study, due to its peculiar geotectonic, both of genesis, monitoring and prediction of volcanic activity form the major objectivity in The International Disaster Reduction Program, broadband seismic data will inverse high-resolution information for the underneath structure in the West Yunnan and volcanic area.

滇西地区以其独特的构造环境，成为大陆动力学研究的热点地区之一；而火山活动的成因、监测与预报则是国际减灾计划的重要组成部分，宽频带地震资料的接收函数反演能够为滇西地区和火山地区的深部结构研究提供高分辨的信息。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。