21EC42 Dayananda Sagar University • Electronics & Communication Engineering (Semester 4)

Signals and Systems

💡 DSU Exam Strategy & Guidance

Classification of Signals (Continuous/Discrete, Periodic, Energy/Power), LTI Systems (Convolution Integral/Sum), Fourier Transform, Laplace Transform, and Z-Transform.

High-Yield Passing Strategy: Solve convolution numericals and ROC (Region of Convergence) properties in Z-Transforms.
Most Repeated Question Topics:
Convolution Sum and Integral EvaluationsFourier Transform Properties & DualityZ-Transform Inverse & ROC Stability CriteriaLTI System Causality & Stability Proofs

🔥 Most Predictable Exam Questions (1)

Guaranteed Every Year 8 Marks Module 2: LTI Systems & Convolution

Q1. Evaluate the continuous-time convolution integral y(t) = x(t) * h(t) where x(t) = e^(-2t) u(t) and h(t) = u(t - 1). Plot the output signal y(t).

Key Points: For t < 1, overlap is zero => y(t) = 0. For t >= 1, y(t) = integral_1^t e^(-2 tau) d tau = [-1/2 e^(-2 tau)]_1^t = (1/2) [e^(-2) - e^(-2t)]. Result: (1/2)(e^(-2) - e^(-2t)) u(t-1).

🎓 Open Source Courses & Video Playlists (2)

MIT OpenCourseWare

MIT 6.007: Signals and Systems (Prof. Alan Oppenheim)

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YouTube (Neso Academy)

Neso Academy: Signals and Systems Full Playlist

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📄 Previous Year Question Papers (1)

END_SEM • 2024

End Semester Exam 2024

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