变换

Based on the characteristic of multi-resolution analysis of wavelet transform, pitch detection algorithm with the combination of wavelet transform and weighted autocorrelation function is proposed here.

3基于小波变换的多分辨率分析特性，提出了小波变换与加权自相关函数相结合的基音检测算法。

Furthermore, The frequency-domain relationship between the electric flux density and the electric field is managed with the Z transform, which is of frequent use for digital filtering and signal processing. The optical pulse propagating in nonlinear and dispersive media is analyzed with Z transform, which is simpler than with auxiliary differential equation method.

同时利用数字滤波和信号处理中经常使用的Z变换来处理D和E间的频域关系，并具体分析了如何用Z变换法来处理非线性色散问题，此方法与辅助差分法相比要较为简单明了。

A method of image enhancement is proposed based on particle swarm optimization,which can automatically find the optimal regularized Beta function to achieve image adaptive enhancement.

文中提出了一种基于微粒群的自适应对比度变换算法，该算法能自动寻找最优的Beta函数参数，实现图像对比度的自适应变换。

But,it is still a problem to find the two parameters of the Beta function for an input image to be adaptively enhanced.

Tubbs通过使用规则化Beta函数拟合对比度变换曲线，能实现图像对比度的自适应变换；但使用该方法需确定Beta函数的两个参数，其参数的自适应选择仍是一个较为复杂的问题。

In order to solve this problem, the paper presents a so - called Bi - watermarking Algorithm Based on Wavelet Packet and DCT transform.

针对这一问题，该文在结合小波包变换和离散余弦变换的同时，在图像小波包分解后的低频和高频部分选取适当系数分别嵌入同一个水印。

Bilinear system model of DC-DC converters is built, combined with the control objective and extending the system, closed-loop nonlinear control system model of DC-DC converters is found.

首先建立了DC-DC变换器双线性系统数学模型，结合控制目的进行适当变形，得到DC-DC变换器的闭环非线性控制系统模型。

Parameter identification Markov method for continuous stochastic linear system and bilinear system via wavelet transform The statistical properties of continuous Wiener process are studied.

基于小波变换的离散随机线性和双线性系统参数辨识Markov方法分析了由白噪声驱动的有理滤波器输出随机信号在小波变换下的滤波和去相关特性，提出一种在线估计噪声协方差矩阵及其Cholesky分解因子的方法。

Cklund transformation andDarboux transformation, bilinear method, AC=BD model, and so on.

cklund变换与Darboux变换、双线性方法、AC=BD框架下的精确求解等。

Analog circuits;Neural network;Fault diagnosis;Particle swarm optimization;Bilinear transformation;multidimensional spaces

模拟电路；神经网络；故障诊断；粒子群算法；双线性变换；多维变换

A design method of switched-currentladder filters using the bilinear transformation is proposed.

开关电流梯形滤波器的双线性变换设计孟相如，邱关源（西安交通大学电气系，西安710049）本文提出了一种用双线性变换进行开关电流梯形滤波器设计的方法。

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％。