PSYCH 3A03 Lecture : Tutorial 4- Review.docx

• School: McMaster University
• Department: Psychology
• Course: PSYCH 3A03
• Professor: Paul Faure

Document Summary

A system is linear when: output = a(input) + b. Devices that change only amplitude (a) and phase of an input signal is still linear. If a device is nonlinear, its response to a complex input cannot be predicted from its response to simple sinusoidal inputs. To discover the characteristics of a nonlinear device, we must study its response to both sinusoidal and complex inputs directly (cannot infer one from the other) Filter systems attenuate and introduce phase delays to signals passing through them. These modifications are linear changes because they only modify the original values. However, when a system adds new signals not present in the original input waveform the system is said to be nonlinear.