Frequency Response and Ideal Filters
Stub. Magnitude and phase response of an LTI system, and the ideal lowpass/highpass/bandpass filter models used as a design target.
Splits the frequency response into its magnitude (how much each frequency is amplified or attenuated) and phase (how much each frequency is delayed), and introduces the idealized filter shapes — brick-wall lowpass, highpass, bandpass — that no causal, finite-order system can realize exactly, but which serve as the target every practical filter-design method (later) approximates.
Outline (TODO — flesh out each)
- Magnitude response
- Phase response
- Ideal filters — lowpass, highpass, bandpass, band-reject