Signals and systems oppenheim pearson

1. Is Signals and Systems hard?
2. What are signals and Systems?

Is Signals and Systems hard?

The introductory continuous-time signals and systems (CTSS) course is widely considered one of the most difficult courses in electrical and computer engineering (ECE) curricula.

What are signals and Systems?

Signals and Systems. A signal is a description of how one parameter varies with another parameter. For instance, voltage changing over time in an electronic circuit, or brightness varying with distance in an image. A system is any process that produces an output signal in response to an input signal.