The purpose of this book is to contribute to Signal Processing through researching, testing, and evaluating of the best method to interpolate a signals sample frequency at the modulator of an acoustic modem and a matching decimation method at the de-modulator end, where the result is the original signal. This research of this problem and results were published as a thesis to earn a Masters Degree in Electrical Engineering from San Diego State University under the supervision of Professor fred j. harris Ph.D. This book can serve as a simplified way to understand concepts of signal processing...