abstract signal
2.Abstract: In this paper, the signal analysis methods are expounded from Fourier transform to wavelet transform in the aspect of development of the signal analysis, their respective advantages and shortcomings are analyzed and compared, and the inner development regularity of the signal analysis methods is uncovered.
3.Abstract: In order to process signal in depth and to extract the fault feature from original signal in machinery diagnosis，the graphical display algorithm that can keep the data length of wavelet transform results the same as that of original signal is used.The fault diagnosis of a bend axial piston pump via B-spline wavelet that has linear phase is provided.The results of study demonstrate that the new method has excellent feature and the weak fault signal can be extracted from the strong vibration background of the pump.
4.Abstract: Presents the development of modern signal processing techniques, a new implementation method which realizes quadrature coherent detection by direct sampling of IF signal generated during the implementation of traditional quadrature coherent detection with analog elements in the form of two parallel baseband channels where in phase (I) and quadrature (Q) components of ceived IF singnal where, the imperfect matching of the separate channels due to the analog elements results in high phase and amplitude which meets the needs for high performance radar signal processing, the elementary principles and the implementation process for each method and concludes from simulation results to compare their features and application conditions that the new approach can satisfy of the requirements of high performance SP.
7.Study on the Algorithms of DCT-II Coefficients Based Image Sampling Rate Conversion and Its Architecture Design Abstract With the development of computer, multimedia, signal compression and HDTV(High Definition Television) technology, the display formats of image have become diversified and also comply with corresponding standards respectively.
8.Abstract: A software method of frequency-modulated signal demodulating based on wavelet packet is proposed in this paper.A variety of frequency-modulated signals are analyzed in time-frequency domain and the spectrograms are presented.This method can detect instantaneous frequency effectively and get frequency-modulated information,can be widely applied to dynamic testing and software radio.
