Search - power spectrum in fft

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[matlab] MATLABprograminfft DL : 0: 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
Date : 2026-01-01 Size : 4kb User : 白杨
[matlab] meierdaopufadematlabshixian DL : 0: 对录音信号集中的某一语音，利用BATLAB设计一美尔例谱算法，并实现。取信号集中的一个语音信号：“xxxxxx”，将它作为输入的语音信号来为设计一个美尔倒谱算法，在该算法中，主要设计了以下环节： 1.读入一个语音信号；2.对这个信号归一化；3.对归一化的信号进行加窗处理（这里的矩形窗长度必须为257，重帧长64）；4.进行预加重处理，即通过一个高通滤波器：；5进行512点的FFT；6.分别取模平方得到功率谱；7.在设计的mel滤波器组中，我采用了25个带通滤波器；8.将得到的功率谱信号通过mel滤波器组，得到相应的25个功率值；9.对这些功率值取自然对数；10.对这些值取离散作弦变换；11.将得到的值去掉直流分量，取其它值作为MFCC参数。 -Concentrated on recording a voice signal, using BATLAB designed Mayer cases spectral algorithm, and implementation. Get a voice signal signal focus: "xxxxxx", will it as input for the design of a voice signal to Mel Cepstrum algorithm in the algorithm, the main design of the following links: 1. Read a speech signal 2. On the signal normalized 3. Of the normalized windowed signal processing (here, rectangular window length must be 257, re-frame size 64) 4. For Pre-emphasis processing through a high-pass filter: 5 for 512 points of FFT 6. modulo square were obtained spectrum 7. in the design of mel filter banks, I use a 25 band-pass filter 8 . will be the power spectrum signal by mel filter bank, corresponding to the 25 power values 9. on the power to take the natural logarithm value 10. to take these values as strings of discrete transform 11. will be of value to out DC component, to take other values as MFCC parameters.
Date : 2026-01-01 Size : 13kb User : 赵欣
[matlab] xxx1 DL : 1: 应用matlab，使实测速度数据转化为频域值，采用FFT和非线性最小二乘法进行模拟，在应用相关函数得到功率谱。-Application matlab, so actual speed data into the frequency domain values, simulated using FFT and nonlinear least squares method in the application to obtain the power spectrum correlation function.
Date : 2026-01-01 Size : 1kb User : 王剑
[matlab] fft DL : 0: 本文提出了一种采用六项余弦偶次幂窗三峰插值的算法来对电网谐波进行检测与分析。该算法通过分析电网信号加窗后傅里叶变换的频域表达式，利用谐波频点附近的三根离散频谱的幅值确定谐波谱线的准确位置，进而得到电网谐波的相关参数频率、幅值及相位的计算公式，最后再对其进行加权修正，从而进一步的提高检测的准确度和有效性。- this paper proposes an approach for power network harmonic detection and analysis based on six even order cosine window and triple-spectrum-line interpolation. Through analyzing the adding window signal fourier transform in the frequency domain expression, using amplitude of three discrete spectrum near the harmonic frequency point to determine the accurate position of the harmonic spectrum and get the calculation formula of related parameters of the power network harmonic such as frequency, amplitude and phase, the algorithm further enhances the accuracy and effectiveness by using weighted correction.
Date : 2026-01-01 Size : 1kb User : 陈佳兴
[matlab] nqxrhwwp DL : 0: 主同步信号PSS在时域上的相关仿真，用于特征降维，特征融合，相关分析等,独立成分分析算法降低原始数据噪声，基于互功率谱的时延估计，基于kaiser窗的双谱线插值FFT谐波分析，有详细的注释，是学习PCA特征提取的很好的学习资料。- PSS primary synchronization signal in the time domain simulation related, For feature reduction, feature fusion, correlation analysis, Independent component analysis algorithm reduces the raw data noise, Based on the time delay estimation of power spectrum, Dual-line interpolation FFT harmonic analysis kaiser windows, There are detailed notes, Is a good learning materials to learn PCA feature extraction.
Date : 2026-01-01 Size : 10kb User : kgrbapvm