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A technique for separating harmonic sound sources using FIR comb filters is presented. First, a pre-processing task is performed by a multipitch estimator to detect the pitches that the signal is composed of. Then, a method based on the Short Time Fourier Transform (STFT) is utilized to iteratively extract the harmonics belonging to a given source by using FIR comb filters. The presented approach improves upon exising sinusoidal model approaches in terms of the perceptual quality of the extracted signal.
Gainza, M., Lawlor, R., Coyle, E.: Harmonic sound source separation using FIR comb filters. 117th. AES (Audio Engineering Society) Convention , October 28-31, San Francisco, 2004.