The adaptive sr, studied in this thesis, means that the system automatically selecting parameter with a recursive algorithm, not adaptively adding noise . a parallel connection sr system is introduced and its application in digital frequency shift modulation signal transmission is discussed 我们初步提出了参数自适应随机共振的思想以及收敛算法,同时,我们还研究了数字信号载波调制传输中的并联随机共振系统。
The new scheme employs a recursive algorithm to design controllers for every subsystem, respectively, and takes predesigned control inputs as disturbances . by using lyapunov method, the state of the closed-loop control system is proved to be bounded, with tracking error converging to zero 该方案通过逐层递推的方法,分别针对每一个子系统单独设计控制器,将本层之前已设计好的多项控制输入作为等价干扰,利用李亚普诺夫方法,先证明闭环系统的状态有界,再证明跟踪误差渐近收敛到零。
Chapter two is focused on the wang-ball curves, including definition, properties and recursive algorithms . using the dual functional of the wang-ball basis, the author derives the subdivision algorithms for the wang-ball curves for the first time and then obtains some identical equations of calculation combination 第二章介绍wang-ball曲线的定义及性质,以及wang-ball曲线的递归求值算法,利用wang-ball基函数的对偶泛函,作者在这里给出wang-ball曲线的显式细分算法,并由此导出几个计算组合恒等式。
Under the condition of " comparatively weak correlation between the two noises involved, coherence function is used as a frequency domain amplification factor for improving snr of the output signal to the filter and the speech enhancement effect . meanwhile, a real-time recursive algorithm is put forward in substitute for current algorithms based on short time fourier transform . the new algorithm will simplify computations and will be suited for real-time implementation together with the adaptive systems 接着针对上述nanc系统两路输入信号噪声相关性弱的情况,用相干函数作频域增益因子来提高输出信噪比与改善语音增强效果,同时,通过一种实时迭代算法解决了短时傅氏变换计算量大的问题,简化了计算,便于实时处理与实际应用。
Several typical fault signals in electromechanical system are analyzed with it . in addition to the improved harmonic wavelet in chapter 4, a new half-complex wavelet is presented to improve the complex wavelet, which is given by chaari . o . a unilateral recursive algorithm is derived to improve the real-time characteristic 仿真分析中利用该算法实时消去特定频率的干扰信号,突出故障特征信号,提高故障特征信号的提取能力,该算法还成功地解决了电力系统单相电路瞬时谐波及无功电流的检测问题。
Starting from the collins formula, a recurrence equation of hermite-cosine-gaussian ( hcg ) beams propagating through a paraxial abcd system with a hard-edged aperture is derived, from which the analytical propagation expressions for apertured hcg beams of any order can be derived by using the recursive algorithm 从collins公式出发,推导出了厄米?余弦?高斯光束通过有硬边光阑近轴abcd光学系统传输的递推公式。由递推公式,借助迭代算法,得出受光阑限制的任意阶厄米?余弦?高斯光束的解析传输公式。
Finally, a method is put forward to construct the nurbs curves on sphere, which extends the de boor recursive algorithm in r3 to one on the sphere by replacing the geodesic distances for the lines and studies their many geometric properties analogous to those in euclidean spaces, such as the differential property, the local property, the parameter invariance under a projective transformation, and so on 两种方法均给出误差估计,使逼近螺线可达到任何预先给定的精确阶。最后,给出球面nurbs曲线生成算法:用球面上测地线??劣大圆弧代替直线段,将欧氏空间r~3中的deboor递推算法推广到球面上构造曲线。
Because of the spectral line splitting of the burg algorithm, the recursive algorithm of the ar model, we choice the hamming weighted burg algorithm in this paper . the modified burg algorithm can weaken the spectral line splitting effectively . however, the ar model can ’ t gain the phase of the inter-harmonics 由于ar模型的递推算法burg算法存在谱线分裂现象,文中选择使用hamming窗加权的burg算法来递推ar模型,修正后的burg算法明显减轻了谱线分裂现象,具有较好的抗噪声能力,但无法得到间谐波的相位信息。
Based on a systematic discussion on the contents, characteristics and the up-to-now accomplishments of these three operations in cagd, we present our researches in three ways as follows : ( 1 ) efficient evaluation for parametric curves and surfaces based on generalized ball bases based on the generalization of mathematical model of surface lofting program in the consurf system, two generalized ball surfaces and the recursive algorithms for evaluating them are given . furthermore, the conversion algorithms from bezier form of a surface to these two generalized ball forms are presented 在系统地论述cagd中此三类运算的内容、特点、已有研究成果的基础上,就以下三方面给出了研究成果:(1)基于广义ball基的参数曲线曲面快速求值以前英国航空公司consurf系统机身模线程序数学模型的推广为基础,定义了两类广义ball基曲面,给出了求值的递推算法,推导了bzier曲面到这两类曲面的转换算法
Two block time-recursive algorithms are developed for the efficient and fast computation of the 1-d rdgt coefficients and for the fast reconstruction of the original signal from the coefficients in both the critical sampling case and the oversampling case . the two algorithms are implemented respectively by a unified parallel lattice structure . and the computational complexity analysis and comparison show that the proposed algorithms provide a more efficient and faster method for the computation of the discrete gabor transforms 首先论证了一维rdgt系数求解算法和由变换系数重建原信号算法,不论是在临界抽样条件下还是在过抽样条件下,都同样具有块时间递归特性,并提出了相应的块时间递归算法及其并行格型结构实现方法,计算机模拟验证了并行格型结构实现的可行性,计算复杂性分析与比较也说明了rdgt块时间递归算法的并行格型结构在计算时间方面所具有的高速和高效性能。