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A Quick Test Method for the Diagnosis of Speakers' and Singers' Voices Under Stress

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In recent years, we developed a device for testing the efficiency of stage singers voices. It indicates the intensity of the 3kHz component in the vowel spectrum as a quality factor. In a new version, the device shows the frequency modulation, called vibrato, as a result of the physiological control of the larynx muscle system that is present by an optimum adjustment in good and longtime trained voices. Some other parameters serve for better test results.

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