Abstract
Dedicated front‐end hardware was constructed to enable real‐time extraction of voice fundamental frequency (f0) from electroglottographic signals. The cycle‐by‐cycle voice f0 period was measured by a digital circuit with clock frequencies of 1 MHz and 100 kHz. The temporal f0 information was transferred to PDP 11/34A digital computer via a 16‐bit parallel interface, and converted into frequency by table lookup. The f0 patterns are displayed on a CRT screen via a graphics video interface with on‐board memory for 512×512 pixels. Three types of displays, (1) f0 level, (2) f0 histogram, (3) f0 contour across time, are currently used for monitoring and modification of the voice f0 of the hearing‐impaired individuals. Detailed performance characteristics of the f0 extractor and the results of its use will be described together with the f0 extraction and display schemes. [Work is supported by the National Institute of Handicapped Research and the Gallaudet Research Institute.]
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