DspEdu v2.1 - "SPECTRA Module"

SPECTRA Module Covers the application of FFT calculations for Spectral Analysis of periodic continuous-time waveforms. Resolution , Picket Fence Effect , Spectral Leakage , Effect of Synchronous Sampling , Effect of Window Shape etc can be demonstrated. The program supports six windowing techniques including Kaiser window.

DspEdu 2.1 is a Perl/Tk GUI program for Windows Platform to help Students of Digital Signal Processing at Engineering Undergraduate level in learning introductory DSP and experimenting with basic concepts of DSP. Course Instructors will also find the program of help in enhancing the effectiveness of their lectures by using the plot displays from this program.There are six modules under this program at present.More modules will be added in future and these modules will also undergo revision.

This module covers the application of FFT calculations for Spectral Analysis of periodic continuous-time waveforms.Resolution , Picket Fence Effect , Spectral Leakage , Effect of Synchronous Sampling , Effect of Window Shape etc can be demonstrated. The program supports six windowing techniques including Kaiser window. The user can create, edit and save sampled waveforms. The calculated spectra can be saved into a text file and the plots can be saved in Postscript format.

The main window of this Spectral Analysis Module allows the generation of the waveforms for carrying out spectral analysis on. Two kinds of waves can be constructed from here. The first one is a sum of two sinusoids with same or different amplitudes,frequencies and phases.You can select the parameters from the pull-down boxes or type in the desired values.Useful for resolution and spectral leakage studies.Can be used to study the effect of Window Length , Window Parameter,DFT Length etc on the reported fourier spectrum.Frequency and phase parameters of the two sinusoids in the periodic wave, the sampling frequency , the window length , shape and window parameter etc. are settable.

The second kind is a distorted Sinusoidal Periodic Wave with amplitude and phase of all harmonics upto 25th individually settable.Harmonic Spectral Analysis of 50Hz Utility Current and Voltage waveforms is an important FFT application area in Electrical Power Systems and Industrial Electronics.One can study the effect of window length , DFT length , Synchronised Vs Asynchronous Sampling etc in such applications using the waveforms synthesised from here.

Click on the images below for higher resolution screenshots and click on the link below for more information on this module.