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Digital Equalization Using Fourier Transform Techniques

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Equalization using time domain digital convolution becomes increasingly computationally intensive as impulse response length increases. Fourier transform techniques greatly reduce the computational load. The corresponding theory is reviewed, and various applications are detailed, including room, loudspeaker, instrument, and ambience equalization. A practical real-time implementation using an off-the-shelf digital signal processing integrated circuit is described. Theoretical and practical limitations of the applications and implementation are discussed.

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