Signals & Systems
Signals & Systems by Alan V. Oppenheim, Alan S. Willsky. Used for a class like Linear Systems
Why Read This Book
You should read this book if you need a deep, mathematically sound foundation in how signals and linear systems behave in both continuous and discrete time — knowledge that underpins filter design, sampling, and control in embedded systems. It teaches the analysis tools you will repeatedly use when designing firmware that interfaces with sensors/actuators, implementing DSP on microcontrollers/FPGAs, or reasoning about sampling and aliasing.
Who Will Benefit
Upper-level undergraduates, graduate students, and embedded engineers who implement or analyze signal processing, filtering, and control algorithms on microcontrollers, DSPs, or FPGAs.
Level: Advanced — Prerequisites: Single-variable calculus, ordinary differential equations, basic linear algebra, and familiarity with basic circuit or systems vocabulary (signals, convolution).
Key Takeaways
- Analyze continuous- and discrete-time linear time-invariant (LTI) systems using convolution and impulse responses.
- Compute and interpret Fourier series/transform representations for signal frequency content and filtering behavior.
- Apply Laplace and Z-transforms to solve differential/difference equations and assess system stability and causality.
- Use sampling theory to design and reason about ADC/DAC systems, aliasing, and reconstruction.
- Model systems in state-space form and analyze system properties such as controllability, observability, and stability.
- Design and evaluate basic analog and discrete-time filters and understand their frequency responses.
Topics Covered
- Introduction to Signals and Systems
- Time-Domain Analysis of Continuous-Time Signals
- Time-Domain Analysis of Continuous-Time LTI Systems
- Fourier Series and Continuous-Time Fourier Transform
- Laplace Transform and Continuous-Time System Analysis
- Sampling and Reconstruction of Continuous-Time Signals
- Discrete-Time Signals and Systems
- The Z-Transform and Discrete-Time System Analysis
- Discrete-Time Fourier Transform and Frequency Analysis
- State-Space Analysis of Linear Systems
- Stability, Causality, and System Properties
- Applications: Filtering, Modulation, and System Realization
Languages, Platforms & Tools
How It Compares
More mathematically rigorous and general than many applied DSP texts (e.g., Proakis); compared to Oppenheim & Schafer's Discrete-Time Signal Processing, this book covers both continuous- and discrete-time theory in a unified way rather than focusing primarily on discrete-time DSP.













