The next day, Professor Deniz gave a surprise quiz: “Describe a system where the output is the derivative of the input.”
“A signal is a description of how one parameter varies with another,” he droned. “A system is the transformation that maps input signals to output signals.” sinyaller ve sistemler ders notlari
“It was my brother’s,” Deniz said. “He failed this course three times. Then he became a psychiatrist. He wrote those notes to survive. Before he died, he told me: ‘Signals and systems aren’t about engineering. They’re about understanding how the world touches you, and how you touch it back.’ I keep the notebook in the library, hoping the right student will find it.” The next day, Professor Deniz gave a surprise