INTERSPEECH 2004 - ICSLP
Feature combination techniques based on PCA, LDA and HLDA are compared in experiments where limited amount of training data is available. Success with feature combination can be quite dependent on proper estimation of statistics required by the used technique. Insufficiency of training data is, therefore, an important problem, which has to be taken in to account in our experiments. Besides of some standard approaches increasing robustness of statistic estimation, methods based on combination of LDA and HLDA are proposed. An improved recognition performance obtained using these methods is demonstrated in experiments.
Bibliographic reference. Burget, Lukas (2004): "Combination of speech features using smoothed heteroscedastic linear discriminant analysis", In INTERSPEECH-2004, 2549-2552.