METHOD AND APPARATUS FOR REDUNDANCY-REDUCING DIGITAL SPEECH PROCESSING

摘要

Speech signal is decided voiced or unvoiced by a sequence of unilateral decisions: a first test decides "unvoiced" if standardized energy Es is below a threshold, or "ambiguous" if above the threshold whereby a second test decides "unvoiced" if the number of zero crossings ZC is above a threshold, and ambiguous if below the threshold. Up to six criteria may be so tested as ambiguous before a "voiced" decision is made.