Analysis of Instantaneous Frequency Components of Speech Signals for Epoch Extraction

The major impulse-like excitation in the speech signal is due to abrupt closure of vocal folds, which takes place at glottal instant (GCI) or epoch each cycle. GCIs are used many areas science and technology, such as prosody modification, voice source analysis, formant extraction synthesis. It difficult observe these discontinuities (corresponding GCIs) because superimposed time-varying response tract system. This paper examines phase part different frequency components extract epochs. Three analysis methods decompose into considered. These short-time Fourier transform (STFT), narrow bandpass filtering (NBPF), single (SFF). locations obtained from instantaneous (IF) (i.e., time derivative phase) components. A method for automatic detection epochs using amplitude weighted IF proposed. Performance proposed compared with four state-of-the-art clean telephone quality speech. performance comparable existing but better • systematic investigation computed (NBPF) (SFF) carried out highlight (epochs) signal. As information about present all frequencies, IFs frequencies combined To further enhance epochs, a based on amplitude-weighted three databases, include both shown be speech,