Sobre a dependência estatística entre MFCCs e a combinação de energia e frequência fundamental

Abstract

Mel-frequency cepstral coefficients (MFCCs) are a key feature in speech processing. This study investigates the assumption that MFCC values are independent of the combination of energy and fundamental frequency, which carry prosodic information. This investigation is conducted by developing a null hypothesis test to assess the statistical significance of the independence hypothesis between these two sources of information. The results demonstrate that it is statistically implausible for MFCCs to be independent of the combination of energy and fundamental frequency. Furthermore, replicating a speaker recognition system from the literature provides practical evidence of this implausibility, as the results suggest that these two types of features do not complement each other in terms of performance gains.