Audio Filter Design
Designing active filters for crossovers, equalization, and signal processing.
Active filters using op-amps are essential for audio processing. From speaker crossovers to parametric equalizers, filter design shapes the frequency response of audio systems.
Objectives
- Design Sallen-Key and state-variable filters
- Implement Butterworth, Chebyshev, and Linkwitz-Riley responses
- Build active crossover networks
- Understand filter order and slope relationships
- Select appropriate Q values for different applications
Key Takeaways
- Sallen-Key is simplest for 2nd-order filters
- Linkwitz-Riley crossovers sum flat
- Higher order = steeper slope but more phase shift
- Component matching critical for stereo applications