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An Engineering Study of the 4-Multiply Normalized Ladder Filter

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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.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=5529

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