An engineering example of an orthogonal second order digital allpass filter implementation is presented in a fully parametric audio equalizer application. Independent coefficients control frequency, Q, and boost/cut. The noise and scaling properties of the 4-multiply normalized ladder structure are analyzed and shown graphically.
https://www.aes.org/e-lib/browse.cfm?elib=5529
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.
Learn more about the AES E-Library
Start a discussion about this paper!