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We propose a novel technique for the design of loworder infinite impulse response (IIR) filter models of head-related transfer functions (HRTF's) that uses balanced model truncation. We design tenth-order IIR filters, suitable for efficient real-time implementation, from preprocessed HRTF impulse responses that are of significantly superior quality to current IIR models derived with the Prony and Yule-Walker methods.

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