低频

To increase the security of the watermark, a new binary image encryption algorithm based on TD-ERCS map is presented. The watermark is encrypted by a chaos sequence generated by TD-ERCS map; A novel color image watermarking algorithm is proposed based on discrete chaotic map and 2-dimensions discrete wavelet transform. The watermark is encrypted by the new binary image encryption algorithm, and the encrypted watermark is embed into four sub-bands of the most deep level of blue branch of host image by three-level wavelet transform, and the embedded positions are determined by general cat cha otic map; A novel color-image blind detection watermarking algorithm is proposed based on integer wavelet transform and subsampling. The scrambled watermark is encrypted and embed into the low sub-bands after four sub-images of the Y branch of host image is transformed by two-level wavelet transform, and the embedded positions are determined by Logistic chaotic map, this watermarking scheme can realize blind extraction.

为了提高水印图像的安全性，提出了一种基于TD-ERCS混沌映射的二值水印图像的加密算法，该算法利用TD-ERCS映射产生的混沌序列加密水印图像；将离散混沌映射和二维离散小波变换相结合，研究了彩色图像水印新算法，该算法先对混沌序列加密后的水印图像进行小波变换，再嵌入到宿主图像的蓝色分量的最深层的四个子带中，嵌入位置则由广义猫映射确定；将整数小波变换和图像子采样技术应用于数字水印，提出了一种彩色图像盲提取水印算法，水印嵌入时，先对宿主图像在YIQ色彩空间中的Y分量进行子采样，并对得到的四个子图像分别进行二级离散小波变换，然后将置乱并加密后的水印图像嵌入到小波变换后的低频子带中，其嵌入位置由Logistic混沌映射产生的混沌序列确定，实现了水印的盲提取。

But, the number of subwoofers which can affordably supply both deep and accurate theatrical sounding bass are fairly slim.

但是，价格合理，又能提供既有足够下潜，又精确的剧院化低频的低音炮屈指可数。

The LFE channel was reproduced by a pair of Wilson WATCH Dog subwoofers.

低频方面是由一组威信的WATCH Dog推动。

Universal design procedure is presented for enhancing the low-frequency responses of loudspeakers ranging from handset microspeakers to subwoofers.

bstract：本论文著重在扬声器的低频延伸设计，从微型扬声器到中大型的扬声器都在本文探讨的范围里。

In this mode,all frequencies below the cross-over point of any main speakers are sent to the subwoofer.

在这种模式下，对任何声道的分频点以下的低频信号将全部会被发送到低音炮中。

The well-known empirical e-lgσ' relation is introduced into the study on one-dimensional nonlinear consolidation of one-layered soil under cyclic loadings. The corresponding consolidation equation is established with the assumptions that the decrease in permeability of soil is proportional to the decrease in compressibility during the consolidation process and that the distribution of initial effective pressure does not vary with depth.

将孔隙比e与有效应力σ'关系引入循环荷载作用下单层地基的一维非线性固结问题的研究之中，通过假定土体中的初始有效应力沿深度均匀分布和固结过程中上体渗透性的降低与压缩性的减小成正比，建立了低频循环荷载作用下单层地基的一维非线性固结问题的固结方程。

On the basis of taking full advantage of multi scale wavelet analysis,the proposed algorithm improves the contrast of the approximations of the wavelet transform through two lifting steps,and shrinkages the coefficients of wavelet transform on the diferent degree and then enhances the coefficients.

在多尺度分析基础上，该算法对小渡分解得到的低频子带图像采用两步提升法进行对比度增强处理，而对小波分解得到的不同方向上的小波系数进行不同程度的去噪并增强。

the permittivity at low frequency is expected encourage the kinetic approach to the study of rouleaux, which has been theoretic basis to measuring erythrocyte sedimentation rate.

低频介电常数能反映红细胞叠连现象，为将来开发新型血沉测量仪奠定了理论基础。

Although room resonances can be reduced by adding bass traps, they cannot be eliminated entirely.

虽然可以通过增加低频陷阱减少共振，但并不能完全消除。

Is a research and development, production, sales as one of the transformer manufacturer, main products have all kinds of high, low-frequency power transformers, audio, USP transformers, rectifiers manufacturers and have many years of production experience.

是一家集研发、生产、销售为一体的变压器制造商，主要产品有各类高、低频电源变压器、音频、USP变压器、整流器的厂家、并有多年的生产经验。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失