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Real-Time Control of DSP Parametric Equalizers

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Network control brings new possibilities to user interaction with DSP devices. It is important to offer real-time control of filter shapes (Q, cutoff/center frequency, order) by changing filter coefficients in real time. Textbook solutions to DSP filter problems rarely consider such dynamic situations. This paper presents observations on implementing real-time control of DSP. It will explore the update rate (dQ/dt, df/dt, dA/dt) and granularity required to achieve perceptually smooth, apparently real-time control. Stability problems raised by interpolation algorithms are also discussed.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=6192

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