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While Prior Subspace Analysis (PSA) has proved an effective tool for transcribung mixtures of snare, kick drum and hi-hat, attempts to extend it to increased numbers of drum types have met with mixed results. To overcome this an automatic grouping method has been developed to group drum events on their similarity in frequency content. Combined with PSA this creates a system able to handle robustly greater numbers of drum types. The effectiveness of this method is demonstrated in a drum transcription algorithm.
Fitzgerald, D., Lawlor, R. & Coyle, E. (2003) Drum transcription using automatic grouping of events and prior subspace analysis. Proceedings of the Digital Audio Effects Conference (DAFX03) pp.13-17, London, England, 2003