噪声功率谱

利用多项式拟合和MATLAB估算红外成像系统的归一化噪声功率谱

Estimation of Normalized Noise Power Spectrum of Infrared Imaging System with Polynomial Fitting and MATLAB

噪声功率谱估计是语音增强系统的一个重要组成部分。

Noise power spectrum estimation is a fundamental component of speech enhancement .

基于噪声功率谱的IC组件内部故障定位方法研究

Study on Fault-location in IC Device Based on Noise Power-spectrum

比较了纯PN结雪崩二极管和带有隧道穿透的PN结雪崩二极管的噪声功率谱密度。

The spectral noise power density of pure avalanche diodes is compared with that of avalanche the diodes with tunneling penetration .

海拉尔兰州核查地震台阵的勘址和地动噪声功率谱的计算其模拟结果表明，该方法不但能有效地获得AR模型参数的最佳估计，而且能实现低信噪比的信号检测。

Array site survey for two new IMS primary stations in China and their power spectrum estimations of ground motion noise Several signal spectrum estimations have been obtained by means of this kind of parameter estimation .

针对静电在MOS器件中引入的潜在损伤，在使用1/f噪声功率谱监测的同时并提出了一种新的由1/f信号提取得到的基于子波变换极大模的相似系数表征法。

Aiming at latent damage induced by ESD , 1 / f noise spectrum and a new method similarity coefficient based on the matched maxima of wavelet transform modulus are offered at the same time .

对于采用BPSK调制的IR-UWB通信系统，文中计算了在固定信噪比和固定噪声功率谱的两种不同情况下，接收机与发射机间具有不同相对位置情况下的误码率。

For IR-UWB system with BPSK modulation , the bit error rate is calculated for UWB receiver at different directions under situations of fixed signal-to-noise ratio or fixed noise power spectrum density in the channel .

基于高频地波OTHR的信号分辨与检测机理，从相位噪声功率谱密度的角度对相参解调方式和非相参解调方式进行了比较分析。

Based on the signal resolution and detection mechanism of HF ground wave OTHR , the differences between the coherent demodulation and the non-coherent demodulation are analyzed , according to the phase noise power spectral density .

舰船辐射噪声功率谱特征提取方法研究

A New Power Spectrum Feature Extractive Method of Ship Radiated Noise

上海地震台阵地动噪声功率谱分析

Power spectrum analysis of ground motion noise in Shanghai Seismic Array

然后重点研究了噪声功率谱估计算法。

Chapter three focus on the noise power spectrum estimation .

本文给出了频标放大器输出级相位噪声功率谱密度的公式。

A formula of phase spectrum density for transistorized amplifier is given .

随机过程的白噪声功率谱及工况诊断

The Power Spectrum of White Noise and the Diagnosis of Work Conditions in the Random Process

国家数字地震台网台站地动噪声功率谱分析

The power spectrum analysis of earth motion noise at the stations of National Digital Seismic Network

文中提出等效噪声功率谱密度的概念。

The concept of " equivalent noisy power spectral density " is introduced in this paper .

讨论了舰船噪声功率谱在水声信号中的意义，分析了信号功率谱的基本性质和理论模型；

The meaning , the basic character and academic model of power spectrum on underwater signal were discussed .

从带噪语音功率谱中减去噪声功率谱的估计值得到纯净语音功率谱。

Subtracting a noise spectral estimate from a noisy speech spectrum can therefore retrieve the spectrum of clean speech .

根据工程实际要求，用随机动力学理论构造具有白噪声功率谱的地面运动的随机动响应表达式。

First , the random dynamic theory is applied to build an expression of random dynamic response constraints considering engineering requirements .

同时，这种级联装置输出噪声功率谱是均匀的，适于雷达信号处理系统采用。

The spectrum of output noise power ' is uniform . This will lead to appropriate implementation in the radar signal processing system .

该噪声功率谱的等效分析计算方法对射频系统建模有很好的指导作用。

This equivalent computation method of noise power density has a good instructional meaning to noise analysis and proper system modeling of RF receivers .

噪声功率谱估计和先验信噪比估计的准确性有助于提高增强后的语音质量。

Correct noise power spectrum estimation and a priori signal-to-noise ratio ( SNR ) estimation are all essential to good quality of the enhanced speech .

采用双过滤白噪声功率谱模型描述地震动，并用林家浩虚拟激励法进行随机响应分析。

The seismic ground motion is assumed to be double filtered white noise , and pseudo excitation approach is employed to calculate the random response .

根据数值计算结果，对比分析不同轮毂比风扇的静特性、噪声功率谱密度分布、噪声声压级分布以及噪声声压级衰减的趋势。

For the different hub ratios the numerical results for the static characteristics , sound power spectral density , sound pressure level and its attenuation trend were comparatively analyzed .

从噪声功率谱的等效计算出发，给出了加性高斯白噪声通过有噪线性电路的分析方法。

The analysis procedure of AWGN ( additive white Gaussian noise ) through noisy linear circuits is given in detail using the theory of equivalent computation of noise power density .

在研究结果中，根据噪声功率谱的全频段平均值，把37个国家数字地震台站的台基质量分为三类，在文中给出了分类结果和相应的地动噪声曲线图。

As a result , we classify these stations into three grades by comparing the average of noise power spectrum in whole-band range and present the resultant figures in this paper .

这表明相位噪声功率谱密度随外腔长度而周期性地漂移，且功率谱密度的峰值随外部反馈耦合率而发生很大的变化。

It is shown that the phase noise spectrum density shift periodicity with the length of external cavity and the peak value of power spectrum density varies considerably with the feedback coupling rate .

在研究、测试、分析器件噪声功率谱的基础上，利用器件噪声的特性，结合电路理论，首次提出对故障组件内的故障元件进行测试定位和比较放大器输入端电阻阻值大小的研究方法。

Based on study , measurement and analysis of device noise power-spectrum , a fault-location approach that took advantage of device noise - characteristic and combined it with circuit theory was first proposed .

通过对噪声功率谱的多次平均和快速傅立叶变换，有效地测量了非稳散粒噪声的频谱特性，研究结果表明非稳散粒噪声具有确定的相位依赖特性。

After average of power noise spectrum and fast Fourier translation , the power density spectrum of non-stationary shot noise is measured effectively , and the phase dependence characteristic of non-stationary shot noise is proved .

只要知道干扰信号的功率谱密度函致，即可将其折算为等效噪声功率谱密度，从而算出直扩系统的误码率。

So long as the power spectral density of the interfering signal is known , it may be changed into ths " equivalent noisy power spectral density " and hence the bit error probability of the DS system will be calculated .

最后给出几种信噪比估算例子，通过对地震记录中的信噪比估算，利用AR模型谱估计算法估计出信号中的噪声的功率谱，消除噪声后，使地震记录信噪比提高。

Finally this thesis introduced some examples of signal noise ratio estimation , through estimating the SNR of seismogram , and then utilizing the AR spectral estimation estimated the noise 's spectrum , eliminated the noise from seismic data , and improved the SNR of seismogram .