Intra-speaker variability of the long term speech spectrum

Abstract

400-channels constant bandwidth (12.5 Hz) Long Term Spectra (LTS) delivered by a BK 2033 analyser have been drawn from French utterances. The cross-correlation coefficient was used to investigate LTS residual intra-speaker variability both in inter- and intra-text conditions. Significant subject-dependent differences habe been revealed in both conditions. They indicate voice coherence variability in the speakers. Correlations lowering in inter-text condition moreover reveals the content-dependent nature of LTS. The need for basic LTS research prior to further application is therefore emphasized.