DEVELOPMENT OF SCREENING SYSTEM FOR LARYNGEAL CANCER USING SPEECH INFORMATION THROUGH TELEPHONE LINES

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Database of pathological voice has been created, which consists of 345 vowels sustained by patients with laryngeal cancer, vocal fold polyp, recurrent laryngeal nerve paralysis, vocal fold nodule, sulcus vocalis and other typical laryngeal disearses as well as by normal subjects. All the vowel signals have been recorded through the public telephone lines. The database includes information on laryngeal disease, age, gender, psychological voice quality judgments (GRBAS) of the patient together with both direct and telephone voice signals. The acoustic parameter values of jitter, shimmer, laryngeal noise, spectral envelope, and average fundamental period have been compared between the vowel signals before and after passing the telephone line. Statistical test has shown that no significant difference exists between them in terms of the screening. An artificial neural network with three layrs have been trained to classify an input vowel utterance into three categories, i.e.severely hoarse (laryngeal cancer doubted), hoarse (recommended to have check up by an ENT doctor) and no hoarseness. A screening system for laryngeal cancer has been installed at National Cancer Center Hospital East and has been tested for about 450 subjects who are mostly residents around Kashiwa City area where the hospital is located. Performance evaluation of the system is now underway.