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Matlab program required to produce velocity and displacement waveforms from digital acceleration waveform. Using Matlab R2011 with Signal Processing toolbox. Data will be in spreadsheet format with columns showing time and up to three columns of acceleration data (sampling usually at 500 Hz or 1 kHz). Preferred procedure for accuracy is omega arithmetic where FFT performed on waveform, integration takes place in frequency domain and inverse FFT to get back to time domain (of velocity, then displacement after another round).