دانلود کتاب موجک‌ها و سیستم‌های تبدیل موجک و کاربردهای آنها – رویکرد پردازش سیگنال دیجیتال

This book is all about wavelets, wavelet transforms, and how they can be applied to solve problems in different fields of study. The question asked often is, what are wavelets? The answer is that wavelets are waveforms of limited duration that have average values of zero. In comparison to sinusoids, wavelets do have a beginning and an end, while sinusoids theoretically extend from minus to plus infinity. Sinusoids are smooth and predictable and are good at describing constant frequency which otherwise can be called stationary signals. In the case of wavelets, they are irregular, of limited duration, and often non-symmetrical. They are better at describing anomalies, pulses, and other events that start and stop within the signal.