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Register a new userAnalysis Study of Formant Frequencies Changes According to the Speaker's Vocal Tract Shape
دراسة تغيرات ترددات رنين الإشارة الصوتية باختلاف معمارية الجهاز الصوتي للمتحدث
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جعفر الخير( باحث )
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تمَّ في هذا البحث دراسة تغيرات بعض خصائص الإشارة الصوتية تبعاً لعامل البنية التشريحية للجهاز الصوتي للمتحدث، إذ تمَّ بناء قاعدة بيانات تضم ملفات صوتية تعود إلى 57 متحدث بالغ تتراوح أعمارهم بين 35 و 45 عام جميعهم ذكور، جميع المتحدثين من خلفيات اجتماعية و ثقافية متقاربة، و لا يعانون من أي عيوب نطقية أو سمعية. سُجلت الملفات الصوتية المُضمنة في قاعدة البيانات ضمن شروط تسجيل مثالية، حيث تمً التسجيل في بيئة معزولة صوتياً و بحضور تقني صوت و خبير صوتيات، و استغرق التسجيل لكل متحدث حوالي خمس دقائق لفظ فيها الحروف الصوتية العربية (الألف و الواو و الياء) من خلال لفظه لكلمة "سألتمُونِيهَا" ثلاث مرات متتالية. اعتماداً على تحليل التسجيلات الصوتية الناتجة تمَّ رصد التغيرات الحاصلة في قيم ترددات توافقيات المجرى الصوتي الممتد من الحبال الصوتية إلى الشفاه و المسماة النغمات (Formants)، حيث أن الأبعاد و الشكل الفسيولوجي للجهاز الصوتي المتعلق بالاصطناع العام للجسم يعتبر من أهم المعلومات التي يمكن التنبؤ بها من تحليل الإشارة الصوتية. لقد أظهرت نتائج هذا البحث وجود تناسباً عكسياً بين قيم ترددات النغمات الثلاثة الأولى F1, F2, F3 و بين طول المجرى الصوتي، بينما لا توجد علاقة واضحة بين ترددات النغمتين الرابعة و الخامسة F4, F5 و بين طول المجرى الصوتي (Vocal Tract.
In this research, some of audio signal properties have been studied according to the speaker's vocal tract shape. A database of audio files has been recorded. These files belong to 57 men whose age between 35 and 45. All speakers came from the same academic and social culture. Furthermore, they don't suffer from any problems in hearings and utterance. The vowel database was created in perfect recording conditions. The spent time needed for recording process was about five minutes for each speaker who said the Arabic word " سألتمُونِيهَا " three times. That word is very rich of vowel letters. It composes of the whole Arabic long vowel. Based on the analysis study of the recorded audio signals, the relationship between the formant frequencies and the length of speaker's vocal tract has been studied. The results show an inverse proportion for the first three frequencies F1, f2, F3 and no clear relationship for the two other frequencies F4, F5.
References used
M. E. Ayadi , M. S. Kamel , F. Karray, “Survey on Speech Emotion Recognition: Features, Classification Schemes, And Databases”, Pattern Recognition 44, PP.572-587, 2011
I. Chiriacescu , “Automatic Emotion Analysis Based On Speech” , M.Sc. THESIS Delft University of Technology, 2009
Nitin Thapliyal , Gargi Amoli “Speech based Emotion Recognition with Gaussian Mixture Model” international Journal of Advanced Research in Computer Engineering & Technology Volume 1, Issue 5, July 2012
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