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The design of a microcomputer-controlled voice onset time analyzer.

In spoken syllables such as "ta," the interval between the release of the tongue constriction for the stop consonant /t/ and the onset of the vowel is called voice onset time, or VOT. Voice onset time is an important determinant of whether the initial consonant will be heard as a /t/(values of 60-90 ms) or as a /d/ (values of 0-30 ms). VOT information, immediately following a spoken syllable, can provide a speaker with feedback for modifying speech production. Such information can help the hearing-impaired learn to speak. It may also help people who learn English as a second language, since they often produce /b,d,g/ and /p,t,k/ with inappropriate VOT values. A prototype portable device measures VOT for initial voiced and voiceless stop consonants (e.g., "da" and "ta"). A dual-microphone method is used for acoustic measurement. A microphone in front of the mouth picks up the radiated acoustic signal; another over the larynx transduces vocal vibrations that mark the beginning of a vowel. Analog circuits process the transducer signals and provide gain and filtering. Filters were designed on the basis of the acoustic properties of stop consonants. The output from each analog circuit is fed to a comparator that compares the signal level with a fixed threshold voltage reference. A digital timer starts when the amplitude of the oral signal voltage exceeds a threshold and stops when the laryngeal signal voltage exceeds a threshold. VOT values obtained by the device were compared with those made from digital waveforms of words spoken by five talkers.(ABSTRACT TRUNCATED AT 250 WORDS)

Female↗
PubMed1990

[Present level of software production for the use of microcomputers, PCh's and terminals in the stomatology of the GDR].

The informatics team of the Stomatological Society of the GDR provides a complete list of presently available program packages for home, 8 and 16-bit computers and a list of the programming teams. Main developments for the use of PC's in stomatology are described as well. By establishing clear lines for the development of software, standardized user software can be guaranteed.

Dental Instruments↗
PubMed1990

Microcomputer image processing in gastrointestinal endoscopy.

A computer-based system was developed to handle information and endoscopic images in a clinical setting. The system is based on an 80286 AT computer whose topology includes a 16-bit color image capture/display graphics adapter and a 256 gray scale 8-bit digital image analysis processor. Using its color capabilities, one may initiate a picture database of patient's endoscopic images, x rays, and relevant clinical data. The computer-based imaging system allows instant access to this information and minimizes subjective evaluation, improving comparison and follow-up of treatments in a more objective manner. The image analysis components permit digital characterization of lesions, which allows online measurements and image enhancement. This is a cost-effective method of handling information and images in the clinical setting, facilitating endoscopic management and follow-up of the patient with gastrointestinal disease, as well as an effective research and teaching tool.

Computer Graphics↗
PubMed1990

[A microcomputer processing system of evoked potentials of brain slices and applied examples].

Processing the evoked potentials of neurons with a computer can greatly increase the efficiency of data processing and obtain much more information from the data. Besides, it renders possibility of large quantities and prolonged observation. In this system, DMA mode is used for data transfer from A/D card to the computer, so total processing program including sampling subroutine was made in BASIC language. This article introduces the functions of this program in processing data and the technique in making this program.

Brain↗