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.

Author: Massie, Dana C.
Affiliation: E-mu Systems, Inc., Scotts Valley, CA
AES Convention: 91 (October 1991) Paper Number: 3187
Publication Date: October 1, 1991 Import into BibTeX
Subject: Signal Processing
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=5529

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