艺术·Art abstract art:抽象派艺术 A nonrepresentational style that emphasizes formal values over the representation of subject matter. 强调形式至上,忽视内容的一种非写实主义绘画风格 Kandinsky produced abstract art characterized by imagery that had a musical quality
Discrete-Time Signals: Time-Domain Representation Signals are represented as sequences of numbers, called samples Sample value of a typical signal or sequence denoted as x[n] with n being an integer in the range-∞≤n≤∞ ·x[n] defined only for integer values of and undefined for non-integer values