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Description: 1．用Matlab产生正弦波,矩形波,以及白噪声信号，并显示各自时域波形图
2．进行FFT变换，显示各自频谱图，其中采样率，频率、数据长度自选
3．做出上述三种信号的均方根图谱,功率图谱,以及对数均方根图谱
4．用IFFT傅立叶反变换恢复信号，并显示恢复的正弦信号时域波形图
-1. Using Matlab generated sine wave, rectangular wave, as well as the white noise signal, and display their respective time-domain waveform of Figure 2. FFT to transform, showing their frequency spectrum, including sampling rate, frequency, data length of 3-on-demand. Made of the three signals in root-mean-square maps, power maps, as well as the number of root-mean-square map 4. Fourier Transform IFFT with the restoration of signals, and displays the sinusoidal signal the resumption of time-domain waveform
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Author: 白杨 |
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Description: Matlab和Labview混合编程，可以演示信号的白噪声添加和滤波，以及时域和傅立叶变换后的频域波形-Matlab and Labview mixed programming, you can demo the white noise signal add and filtering, as well as the time-domain and Fourier transformed frequency domain waveform
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Size: 67584 |
Author: 许昕 |
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Description: 时频分布中交叉项抑制的研究进展.pdf-详细介绍了交叉项抑制的几种实用的方法。-Time-frequency distribution in the cross-term suppression of research. Pdf-detailed information on cross-term suppression of several practical approach.
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Size: 359424 |
Author: z |
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Description: 改程序基于改进节点法（Modified Nodal Approach）与全矩阵技术在Matlab中实现线性电阻电路的符号分析。可以在GUI中描述待分析的电路结构、启动分析并直观的观察分析结果。在实现分析功能的同时，提供完整的编辑、输入保护以及数据保存功能。详细说明请见压缩包内文档。-Changed procedures to improve the node-based method (Modified Nodal Approach) with the full-matrix technology in Matlab to achieve linear resistance analysis of circuit symbols. GUI can be described in the circuit structure to be analyzed, start analysis and visual observation of the results of the analysis. Analysis function in the realization at the same time, provide a complete editing, input protection and data retention functionality.
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Size: 198656 |
Author: MacDong |
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Description: 一种等精度的频率计，同时适合高频和低频，误差小。-A precision frequency meter, etc. At the same time, suitable high-frequency and low frequency, the error small.
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Size: 1024 |
Author: 邹国雄 |
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Description: 现在我终于找到了一份,它以FUNCTION的形式,再现了OFDM映射,IDFT/DFT,同步(时间/频率同步)和信道估计,以及频率偏移的估计等一系列代码.希望大家能从中得到你需要的东西.
-Now I finally found a copy of it to the form of FUNCTION, reproduces OFDM mapping, IDFT/DFT, synchronized (time/frequency synchronization), and channel estimation, as well as the frequency deviation of the estimated range of the code. I hope that everyone will be you need.
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Size: 35840 |
Author: 周致远 |
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Description: 一个简单的PCFG分析器
分析结果逐个以树形图方式显示，如果一个句子有多个结果，在显示框中同时显示-A simple PCFG parser with the results of the analysis-by-tree approach shows that if there is more than the result of a sentence, in the box at the same time show show
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Size: 232448 |
Author: 李明 |
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Description: 运用Matlab6.5实现跳频通信系统中跳频信号的时频分析-Matlab6.5 use of frequency hopping communication system to achieve frequency hopping signals in time-frequency analysis
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Size: 1512448 |
Author: hehha |
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Description: PWVD在跳频信号时频分析中的应用,希望能对大家有所帮助-PWVD in the frequency-hopping time-frequency signal analysis, hoping to help all of you
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Size: 165888 |
Author: hehha |
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Description: 基于时频分布的跳频信号分析研究，短时傅立叶变换，魏格纳分布，伪魏格纳分布，平滑伪魏格纳分布-Based on the distribution of time-frequency analysis of frequency hopping signals, short-time Fourier transform, Wigner distribution, pseudo-Wigner distribution, smoothed pseudo-Wigner distribution
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Size: 208896 |
Author: hehha |
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Description: 给定函数，变换到频域内，比较短时傅里叶变换大、小视窗和小波变换的区别，生成时频分析图-A given function, transform the frequency domain, more short-time Fourier transform, and a small window and the difference between wavelet transform to generate time-frequency analysis
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Size: 1024 |
Author: 郭珈 |
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Description: 是一种很重要的滤波方式，时域频域联合起来-Is a very important way of filtering, frequency domain time domain together
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Size: 2048 |
Author: 刘娜 |
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Description: 端点检测是指用数字处理技术来找出语音信号中的各种段落（如音素、音节、词素、词等）的始点和终点的位置。语音段起止端点检测是语音分析、语音合成和语音识别中的一个必要环节。传统的端点检测方法是从wav文件中获取语音采样，将其分帧并计算短时能量和过零率参数，然后进行端点检测。这种工作方式被称为离线处理方法 ，无法实现语音信号的实时处理，对于语音信号分析具有一定的局限性。本文通过开发ActiveX控件，在MATLAB环境下将其嵌入到figure窗口中，以GUI程序的方式使用，实现语音信号端点检测的实时处理。-Endpoint detection is the use of digital processing techniques to identify the speech signals in a variety of paragraphs (such as phoneme, syllable, morpheme, word, etc.) the starting point and the end position. Speech endpoint detection is a paragraph beginning and end speech analysis, speech synthesis and speech recognition of a necessary link. Traditional endpoint detection method is to obtain from the wav file voice sampling, its sub-frame and calculate the short-term energy and zero-crossing rate parameters, and then proceed to endpoint detection. This work is called off-line approach can not achieve real-time speech signal processing, analysis of the speech signal has a certain limitations. In this paper, through the development of ActiveX controls, in the MATLAB environment to embedded figure window to use GUI program, the realization of speech signal processing real-time endpoint detection.
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Author: cike |
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Description: 本文首先系统分析了 snort 规则的组成，详细的介绍了各个部分的含义，这对于开发出新的入侵检测系统，建立自己的攻击规则库有很大的帮助。针对系统所需的适应性和自治性，在详细剖析 snort 规则同时，着重研究基于 CVE 入侵检测系统的规则库的实现，底层嗅探器的实现和嗅探过程等问题。在规则特征选项的模式匹配问题上进行重点说明，给出了一种改进的检测方法，即结合使用协议分析进行模式匹配，从试验数据上大大提高了效率，减少了误报率。同时，本系统所基于的 CVE 知识库，跟踪国际上 CVE 的最新发展动态，制订了国内统一的 CVE 标准，具有极大丰富的知识库，有效的解决了国内漏洞库不统一的问题.-The author also describes the architecture and functions and the design and the implement of the software. Intrusion detection system (IDS) is very important for network security. At present, the author systematically analyzes the composition and semantics of Snort rules, which may be of great help for creating signature database, then the paper studies the flexibility and self-controllability in the CVE-based Intrusion Detection System, emphasizes not only on analysis of the snort rules, but on the
realization of intrusion detecting based on CVE rules and the implement of the sniffer. Especially, this paper covers the intrusion signature matching methods, and analyzes the weakness when only uses pattern matching in intrusion analysis and presents an improved approach that combines protocol analysis and pattern matching, to dectect attacks. At the same time it gives an example to show how to use this approach. The experimental results show that the rules surely reduce the rate of misd
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Size: 478208 |
Author: 陈中 |
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Description: Repetitive signal method for time and frequency synchronization for 3GPP long term evolution systems. A new method is proposed and comparison to the other approach is done in this article.
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Size: 249856 |
Author: jenna |
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Description: Joint maximum likelihood (ML)symbol-time and carrier-frequency offset estimator in orthogonal frequency-division multiplexing(OFDM) systems.-Joint maximum likelihood (ML)symbol-time and carrier-frequency offset estimator in orthogonal frequency-division multiplexing(OFDM) systems.
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Size: 136192 |
Author: jenna |
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Description: Time- Frequency- Selective Channel Estimation of OFDM Systems
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Size: 378880 |
Author: vicky |
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Description: 借助小波变换在时频分析上的优点，提取地面运动目标的回波信号特征在目标识别中加以运用-With wavelet transform in time-frequency analysis of the advantages of extracting ground moving target echo signal characteristics to be used in target recognition
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Size: 165888 |
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Description: 时间序列的时频特性分析研究时间序列的傅里叶变换及逆变换，快速梅林变换及逆变换，短时离散傅里叶变换，得到瞬时频率。
研究时间序列的Born–Jondan时频分布图，Butterworth时频分布图，Choi–Williams时频分布图，得到瞬时频率。
-Time series analysis of time-frequency characteristics of time series of Fourier transform and inverse transform, the fast Mellin transform and inverse transform, short time discrete Fourier transformation, the instantaneous frequency. Of time series of Born-Jondan time-frequency distribution, Butterworth frequency distribution, Choi-Williams time-frequency map, get instantaneous frequency.
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Size: 15360 |
Author: 李倩 |
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Description: STFT 实现短时加窗 傅里叶 变换 分析
可用于跳频时频分析-STFT to achieve short time Fourier transform of windowed time-frequency analysis can be used for frequency hopping
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Size: 1024 |
Author: adolphe |
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