Digital Filters: Phase Response and Stability

This lecture covers the phase response constraints for stable linear phase RII filters, the relationship between causality and linear phase, and the characteristics of frequency response modulus. It also discusses minimum phase systems, the influence of zeros on amplitude response, and the design of digital filters. Examples illustrate different phase responses for RIF filters, the concept of minimum phase, and the use of all-pass filters. The lecture emphasizes the importance of stability and causality in digital filters, the limitations of RII filters for linear phase, and the preference for elliptical filters in correcting phase distortion.