余弦

The music signal was divided into several subsections and the length of each section was equal to the duration of one semiquaver. The base frequency was obtained using one dimension DCT operated on each section. The extreme points of the musical notes were found by comparison with the adjacent sub-sections. And then, the musical scores were got using the principle of least derived notes.

采用离散余弦变换结合能量比对的手段，并提出了一种变化音最少法则：以十六分音符对应的时值作为步长，将乐曲信号分为若干个子段；对每个子段进行一维DCT操作，提取基音频率；对相邻子段进行能量比对，查找音符的端点；利用变化音最少法则，生成乐谱。

The music signal was divided into several sub-sections and the length of each section was equal to the duration of one semiquaver. The base frequency was obtained using one dimension DCT operated on each section. The extreme points of the musical notes were found by comparison with the adjacent sub-sections. And then, the musical scores were got using the principle of least derived notes.

采用离散余弦变换结合能量比对的手段，并提出了一种变化音最少法则：以十六分音符对应的时值作为步长，将乐曲信号分为若干个子段；对每个子段进行一维DCT操作，提取基音频率；对相邻子段进行能量比对，查找音符的端点；利用变化音最少法则，生成乐谱。

DSP-based cosine signals generated C preparation procedures, CCS platform can be downloaded to DSK board signal output.

基于DSP的产生余弦信号的用C编写的程序，可通过CCS平台下载到DSK板上实现信号输出。

Note that this ratio does not depend on the particular right triangle chosen, as long as it contains the angle A , since all those triangles are similar.

把直角三角形的弦放在直径上，股就是长的弦，即正弦，勾就是短的弦，即余下的弦——余弦。

Simulation results show that the use MATLAB to achieve discrete cosine transform image compression method is simple, fast, the advantages of a small error, which has greatly enhanced the efficiency of image compression and accuracy.

仿真实验表明，用MATLAB 来实现离散余弦变换的图像压缩，具有方法简单、速度快、误差小的优点，大大提高了图像压缩的效率和精度。

Based on the analysis of the principles of JPEG,by improving the quantization module and the coding module of JPEG,a simple compression algorithm based on discrete Cosine Transform is proposed.

在深入分析JPEG压缩原理的基础上，通过改进JPEG算法的量化与编码模块，提出了一种基于离散余弦变换的简单压缩算法。

Let's now examine the simplest wave from where the profile is a sine or co sine curve.

现在让我们来考察最简单的波形，它的剖面图是正弦或余弦曲线。

Focusing properties of elegant cosh square Gaussian and Sinh square Gaussian beams through a thin lens are studied in detail. And intensity distribution on the axis and focusing intensity distribution are analyzed. Also focal shift of Sinh square Gaussian beams are studied.

详细研究了复宗量双曲余弦平方-高斯光束和双曲正弦平方-高斯光束通过薄透镜时的聚焦特性，分析了光束的轴上光强分布和聚焦场的光强分布，讨论了双曲正弦平方-高斯光束的焦移。

Then based on the second-order moment method, the closed-form expression of the beam width is obtained, and the beam waist width and waist location for elegant cosh square Gaussian and Sinh square Gaussian beams are also deduced.

基于二阶矩定义，分别推导了复宗量双曲余弦平方-高斯光束和双曲正弦平方-高斯光束的光斑尺寸、束腰宽度及其位置，并对结果作了详细的分析和讨论。

Each system includes an integrating sphere, fiber-based spectrometer, near cosine receiver, power supply, and Microsoft?Windows XP?based software and NIST traceable calibrated total spectral flux lamp standard to assure NIST traceable results from 350 to 1050 nm each time.

每个系统包括一个积分球，过滤型分光计，相近余弦接受器，电源供应装置，以及支持Microsoft Windows XP的软件和受到NIST追踪校准之总光通量灯标准确保的，每次350至1050nm范围的NIST跟踪结果。

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。