LARYNGEAL FREQUENCY ANALYSIS FOR LINGUISTIC RESEARCH.
Abstract
This study is concerned with the measurement of the fundamental laryngeal frequency in speech. Visual location of the laryngeal period boundaries is employed as the most suitable reference for evaluating techniques of automatic laryngeal frequency analysis. A laryngeal frequency analyzer is considered to consist of three essential components: a preprocessor, a basic extractor, and a postprocessor. If the basic extractor of the laryngeal frequency analyzer is of the type which is sensitive only to zero crossings, the preprocessor output wave should have exactly two zero crossings per laryngeal period. It was found that the criterion of two zero crossings per period is satisfied if the amplitude of the first harmonic component is greater than the sum of the amplitudes of the other harmonic components when multiplied by their respective harmonic numbers. Harmonic analysis showed that squaring and full-wave rectification are more appropriate for increasing the relative level of the fundamental signal component than half-wave rectification or a logarithmic transformation. A set of speech waves was processed through several experimental analyzers, and three postprocessors employing different principles and having different characteristics of operation were compared. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1965
- Accession Number
- AD0474904
Entities
People
- Norris Paul Mckinney
Organizations
- University of Michigan