A Comparative Study of Missing Feature Imputation Techniques

Conference: Sprachkommunikation - Beiträge zur 10. ITG-Fachtagung
09/26/2012 - 09/28/2012 at Braunschweig, Deutschland

Proceedings: Sprachkommunikation

Pages: 4Language: englishTyp: PDF

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Braun, Michael; Faubel, Friedrich; Klakow, Dietrich (Spoken Language Systems, Saarland University, 66123 Saarbrücken, Germany)

This study presents a performance comparison of different missing feature imputation techniques under ideal as well as realistic conditions. The particular focus is on recent techniques such as Raj’s soft-decision bounded mean imputation approach and Gemmeke’s sparse imputation. In addition to experiments with oracle masks, we evaluate the usefulness of a number of different mask estimation algorithm. This includes the neg-energy criterion and a soft version of the Max-VQ algorithm. As we gradually proceed from ideal to realistic conditions, we can investigate the sensitivity of the methods towards mismatches in the acoustic conditions as well as to errors in the mask estimates.