Books like Analog signals and systems by Erhan Kudeki

An essential reference on discrete‑time signal processing, covering theory, filtering, sampling, and Fourier analysis for readers with basic knowledge of signals and systems.

Signals and Systems by Alan V. Oppenheim delivers a concise treatment of signal theory and system analysis essential for electrical engineering and telecommunications.

Signals and Systems is a comprehensive textbook designed for undergraduate students of engineering for a course on signals and systems. Each topic is explained lucidly by introducing the concepts first through abstract mathematical reasoning and illustrations, and then through solved examples- The book provides a simultaneous coverage of continuous-time and discrete-time signals and systems. Beginning with classifying signals, the book sequentially covers important topics such as convolution and correlation of signals, continuous-time Fourier series, discrete-time Fourier series, continuous-time Fourier transform, sampling. Hilbert transform, Laplace transform, and z-transform. A chapter on MATLAB programs presenting the applicability of the software to problems of signals and systems has also been included at the end of the book --Book Jacket.