Signal Filter Design
Design digital filters to shape signals. Compare FIR, IIR, and window-based methods and understand their trade-offs.
📚 Fundamentals
- Frequency response: magnitude and phase vs frequency
- FIR: finite impulse, linear-phase design via windows
- IIR: recursive filters, sharper transitions
❓ Frequently Asked Questions
1) Why linear phase?
Constant group delay preserves waveform shapes.
Constant group delay preserves waveform shapes.
2) Window choice?
Hann/Hamming/Blackman trade ripple for transition width.
Hann/Hamming/Blackman trade ripple for transition width.
3) IIR stability?
Pole locations must lie inside the unit circle.
Pole locations must lie inside the unit circle.
4) Multirate filters?
Efficient resampling using polyphase structures.
Efficient resampling using polyphase structures.