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schumann_resonance
The Schumann resonance frequencies are a set of eigenmodes in the extremely low frequency (ELF) portion of the electromagnetic field spectrum. These frequencies are only present for planetary-like bodies with a substantial ionosphere acting as a perfect electric conductor, thus forming a resonance cavity with the surface. In this example, the Schumann resonance frequencies for the Earth are calculated.
- 2009-05-14 22:23:51下载
- 积分：1
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ZHIFANGTU
这个程序是关于图像的方针，直方图方法；
画出直方图。(This program is about the principle of the image, histogram method draw histogram.)
- 2011-01-06 13:52:42下载
- 积分：1
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03607_28
DFT进行频谱分析时的三种现象
1、混叠：对连续信号采样，要求连续信号是带限的，采样频率要足够高。Fs应满足Nyquist采样定理才不产生混叠。
采样前加低通滤波器防混叠
2、频谱泄漏：DFT对时域信号进行了截断（相当于采样信号乘了一个窗函数），时域的乘积相当于频域卷积，改变了原信号频谱。
改用其他窗函数（非矩形）改善泄漏。
3、栅栏现象：DFT 只给出了频谱在采样点上的取值，采样点间的频谱内容丢失。(DFT spectrum analysis of a three phenomena, aliasing : continuous signal sampling, requiring continuous signal is band-limited, the sampling frequency should be high enough. Fs meet the Nyquist Sampling Theorem would not have aliasing. Sampling former low-pass filter plus anti-aliasing 2, spectrum leakage : DFT right time domain signal a disconnect (equivalent to a sampling signal by a window function). time domain is equivalent to the product of frequency-domain convolution, changes in the spectrum of the original signal. Window functions to switch to other (non-rectangular) to improve leakage. 3, fenced phenomenon : DFT spectrum is given only at the sampling point value, sampling points of the spectrum as lost.)
- 2007-05-08 16:22:17下载
- 积分：1
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huiseBP
此代码为BP神经网络程序及灰色预测源代码，基于matlab编译环境，适用于各种BP神经网络的拟合及仿真预测，使用前请根据背景自行导入数据及调整神经节数(This code for the program and a pair of grey BP neural network prediction of source code, based on the MATLAB compiler environment, suitable for all kinds of BP neural network for prediction and simulation of fitting, according to the background to the imported data before use and adjust the number of ganglion)
- 2014-09-11 09:55:56下载
- 积分：1
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MATlAB
这是一本针对数字信号处理的MATLAB仿真教材，教材详细介绍了MATLAB的数字仿真，并给出示例。(This is a book for digital signal processing MATLAB simulation textbooks, textbook introduces the digital simulation of MATLAB, and gives examples.)
- 2014-10-28 12:56:21下载
- 积分：1
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BELLHOP_General_Description
为感谢惠俊英老师的谆谆教诲，特为好奇诸君奉上水声物理--海洋传播声场模拟的一份武林秘籍！
当好奇诸君阅毕此卷，再对照轻松跑完六份作业（六路招式），即入“水声物理”之江湖！
BELLHOP与AcousticsToolbox遵照GNU公共许可证进行分发。感谢Michael B. Porter对BELLHOP的原创，也感谢Orlando Camargo Rodríguez此份大道至简的入门秘籍。更感谢由Free Software凝聚起来的自由科学家社区。(Bellhop is a highly efficient ray tracing program, written in Fortran by Michael Porter as part of the Acoustic Toolbox (available at the website of the Ocean Acoustic Library). Bellhop is designed in order to perform two-dimensional acoustic ray tracing for a given sound speed profile c(z) or a given sound speed field c(r; z), in ocean waveguides with flat or variable absorbing boundaries. Output options include ray coordinates, travel time, amplitude, eigenrays, acoustic pressure or transmission loss (either coherent, incoherent or semi-coherent).)
- 2021-04-27 11:38:44下载
- 积分：1
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RollPRP
说明： CT图像重建的变换类算法，该方法采用fourier变换算法(CT image reconstruction Transform algorithm, the method used fourier transform algorithm)
- 2006-05-12 15:16:57下载
- 积分：1
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gmsk
gmsk的源代码，包括了调制，以及有关Vertib编码的代码(GMSK source code, including the modulation, as well as the encoding code Vertib)
- 2008-03-08 11:15:43下载
- 积分：1
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fast_WT_1D
本程序实现不用对数据进行2抽取和2插值的快速小波分解,只需对滤波器进行2插值即 可，所以不要求数据的长度为2的幂次方，共分解了3次，然后进行了重构！！！(This procedure achieved without the data extraction and 2 Fast 2 interpolation wavelet decomposition, only 2 of the interpolation filter that can be, so the data length does not require a power of 2, a total break down three times, then refactored! ! !)
- 2011-10-20 16:50:13下载
- 积分：1
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first_task
随机样本的生成 和 概率密度函数的绘制，课程作业~希望能有所帮助~(Generates a random sample drawn and probability density function of the course work, hope to be able to help ~ ~)
- 2015-04-14 09:50:17下载
- 积分：1
