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Description: 考虑L的三个不同值：L＝256（3个数据段），L＝128(7个数据段)和L=64（15个数据段）。各自的谱估计图如上图所示。可以明显的看到，加窗明显的减小了频谱上的假谱峰，但也更加进一步平滑了谱峰。所以，对于L＝64的情况，在ω＝0.8π的谱线可以很确定的辨认，但是那两个靠近的谱峰不容易区分。对于L＝128的情况，这种情况提供了在分离和检测间最好的均衡。当然，对于在L＝256时的情况，效果是更好的，能够从谱估计图上明显的分辨出三条谱线的存在以及它们幅度关系的强弱。 除了Welch法外，还可以采用对多个周期图求平均的功率谱估计方法的其他方法如Bartlett法等等，在功率谱估计上也能取得较好的结果。-consider three different values : L = 256 (3 data), L = 128 (7 data) and L = 64 (15 data). Their spectral estimation map as shown in Fig. It is clear to see that increase significantly decreasing window of the spectrum of false peaks, but much more to further smooth the peaks. Therefore, L = 64, in the case = 0.8 spectrum can determine the identification, but that the two peaks around is not easy to distinguish. L = 128 for the situation, which provided the separation and detection among the best balanced. Of course, L = 256 in the case, the effect is better, from the spectral estimation map clearly distinguish between the three lines of the existence and their relationship to the rate of strength. In addition to Welch law, but also can be used to map multiple cycle for the average power
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Size: 1826 |
Author: 吴胜 |
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Description: 杰克.韦尔奇与通用之路,成功人物的传记,主要讲述了主人公在通用的成长经历,是一本很不错的书。-Jack. Welch and generic way, successful people in the biography, on the main protagonist in the common growth experience is a very good book.
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Size: 512867 |
Author: 秦爽 |
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Description: 笔者在前人研究的基础上，利用TI 公司的TMS320C6713BDSP 芯片对改进的功率谱估计算法——Welch法进行了实现，验证了算法的可实现性与硬件系统的可行性。
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Size: 59887 |
Author: 万金油 |
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Description: 考虑L的三个不同值：L＝256（3个数据段），L＝128(7个数据段)和L=64（15个数据段）。各自的谱估计图如上图所示。可以明显的看到，加窗明显的减小了频谱上的假谱峰，但也更加进一步平滑了谱峰。所以，对于L＝64的情况，在ω＝0.8π的谱线可以很确定的辨认，但是那两个靠近的谱峰不容易区分。对于L＝128的情况，这种情况提供了在分离和检测间最好的均衡。当然，对于在L＝256时的情况，效果是更好的，能够从谱估计图上明显的分辨出三条谱线的存在以及它们幅度关系的强弱。 除了Welch法外，还可以采用对多个周期图求平均的功率谱估计方法的其他方法如Bartlett法等等，在功率谱估计上也能取得较好的结果。-consider three different values : L = 256 (3 data), L = 128 (7 data) and L = 64 (15 data). Their spectral estimation map as shown in Fig. It is clear to see that increase significantly decreasing window of the spectrum of false peaks, but much more to further smooth the peaks. Therefore, L = 64, in the case = 0.8 spectrum can determine the identification, but that the two peaks around is not easy to distinguish. L = 128 for the situation, which provided the separation and detection among the best balanced. Of course, L = 256 in the case, the effect is better, from the spectral estimation map clearly distinguish between the three lines of the existence and their relationship to the rate of strength. In addition to Welch law, but also can be used to map multiple cycle for the average power
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Size: 2048 |
Author: |
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Description: c++实现HMM，向前向后算法，Viterbi算法，Baum-Welch算法。其中包括用c++定义的HMM数据结构。全部是cpp和h的文件-c achieve HMM, forward backward algorithm, Viterbi algorithm, Baum-Welch algorithm. C including the use of the HMM definition data structure. Cpp all the documents and h
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Size: 8192 |
Author: 宋敏 |
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Description: 序列x（n）的Welch法功率谱估计
用matlab来实现-Sequence x (n) of the Welch method power spectrum estimation using matlab to achieve
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Size: 1024 |
Author: cjl |
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Description: 1、文件夹中包含了经典功率谱估计和自适应均衡算法两个实验的所有程序。
2、R.m、LMS.m、LMSmain.m为自适应均衡算法的程序：
R.m用来计算输入信号的自相关矩阵及其特征值；
LMS.m为时域LMS算法，用统计的方法仿真得出不同信道参数和不同步长下的学习曲线； LMSmain.m为实验主程序，按照实验要求中的具体数据得到实验结果和曲线。
3、functionx.m、fzhouqitu.m、spectrum.m、bt.m、bart_lett.m、welch.m、SPECTRUMmain.m为经典谱估计的程序：
functionx.m产生需要进行谱估计的函数；
fzhouqitu.m用来计算信号周期图的函数；
spectrum.m是用周期图法进行谱估计的函数
bt.m是用BT图法进行谱估计的函数
bart_lett.m是用BARTLETT法进行谱估计的函数
welch.m是用WELCH法进行谱估计的函数
SPECTRUMmain.m是主程序，按照实验要求中的具体数据得到实验结果和曲线。 -a document folder contains the classic power spectrum estimation and adaptive equalization algorithm for the two experiments all the procedures. 2, R.m, LMS.m, LMSmain.m adaptive equalization algorithm for the procedure : R.m used to calculate the input signal and the correlation matrix eigenvalue; LMS.m too LMS algorithm, use statistical simulation method come to a different channel parameters and the synchronous learning curve; LMSmain.m main program for the experiment, according to the experimental requirements of the specific data and the curve of the experimental results. 3, functionx.m, fzhouqitu.m, spectrum.m. bt.m, bart_lett.m, welch.m. SPECTRUMmain.m classical spectrum estimation procedures : functionx.m have a need for spectrum estimation function; fzhouqitu.m used to calculate t
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Description: 杰克.韦尔奇与通用之路,成功人物的传记,主要讲述了主人公在通用的成长经历,是一本很不错的书。-Jack. Welch and generic way, successful people in the biography, on the main protagonist in the common growth experience is a very good book.
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Size: 513024 |
Author: 秦爽 |
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Description: 笔者在前人研究的基础上，利用TI 公司的TMS320C6713BDSP 芯片对改进的功率谱估计算法——Welch法进行了实现，验证了算法的可实现性与硬件系统的可行性。-The author based on previous studies, using TI s chips for improved TMS320C6713BDSP power spectrum estimation algorithm- Welch method to achieve, to verify the algorithm can be realized and the feasibility of hardware systems.
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Size: 776192 |
Author: 万金油 |
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Description: 功率谱 welch 方法
there is a simple demo for non parameteric spectral estimation methods-Welch method of power spectrum there is a simple demo for non parameteric spectral estimation methods
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Size: 1024 |
Author: lxp |
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Description: 本程序实现了短数据序列不同窗函数的welch功率谱估计，然后又求了他们的平均标准差，从而判断各个窗函数的优劣。只要稍作修改就能实现不同信噪比下的功率估计，同时也可以实现长数据序列的估计。-This procedure has a short data series of different welch window function power spectrum estimation, and then seek their average standard deviation, and thus to determine the merits and demerits of each window function. As long as we can with some slight modifications under different signal to noise ratio power estimate, but also the realization of a long data sequence can be estimated.
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Size: 1024 |
Author: wangchun |
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Description: 该程序实现了Baum-Welch算法，对于通信里面的调制解调有很大帮助，其次，该程序具有通用性。-The program achieved the Baum-Welch algorithm, for the communication modem inside helps a lot, and secondly, the program has the versatility.
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Size: 1024 |
Author: 刘红 |
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Description: welch功率谱估计实验代码，matlab源码，内附结果-welch power spectrum estimation experiment code, matlab source code, included the results of
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Size: 4096 |
Author: ZM |
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Description: 这是基于周期图改进的welch的功率谱估计，这种方法是在经典周期图的基础上改进而来的，效果很不错-This is based on the improved welch periodogram power spectral estimation, this method is based on the classical periodogram improvement came, the effect is very good
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Size: 2048 |
Author: 花剑 |
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Description: 从经典功率谱估计周期图法原理入手，从理论上分析了其存在的局限性，借助Welch算法对其进行修正。依靠Matlab强大的数值分析和信号处理能力，进行实验仿真，比较不同的窗函数，不同的数据长度对Welch法谱估计质量的影响，并分析了造成这些影响的原因。-The paper mainly introduces the principles of Periodogram method of classical PSD estimation,analyzes the deficiency of Periodogram method in theory,and makes use of Welch to amend Perodogram method. By the use of simulation in Matlab, the impacts of different window function and different lenghth of data on estimation quality of Welch are discussed and the reasons of the impacts are analyzed.
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Size: 214016 |
Author: co |
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Description: 经典功率谱估计welch例子，可以用于入门学习。-Welch classic example of the power spectrum estimation, can be used for getting started.
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Size: 1024 |
Author: dreamxiangfly |
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Description: welch计算功率谱，可以根据自己的情况做适当的修改，可以运行相应结果(Welch power spectrum calculation)
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Size: 2048 |
Author: 佘萌萌
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Description: 该论文介绍了welch算法求功率谱的公式原理，已经说明(Power Spectrum Estimation using Welch Method for various
Window Techniques)
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Size: 166912 |
Author: john_moon
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Description: 利用Welch法作功率谱估计，与直接功率谱估计法相比，Welch法采用多段平均的方法改进了直接功率谱估计方法(Welch method is used to make power spectrum estimation. Compared with direct power spectrum estimation method, Welch method uses multi-stage average method to improve the method of direct power spectrum estimation)
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Size: 2048 |
Author: 谢欢儿
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Description: 用matlab中的welch分析加速度功率谱密度(a example of matlab fwelch function)
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Size: 1771520 |
Author: 明天831019 |
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