Ch3-Production_and_Classification_of_Speech_Sounds

Ch3-Production_and_Classification_of_Speech_Sounds - Speech...

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Unformatted text preview: Speech Processing Production and Classification of Speech Sounds 2/13/12 Veton Kpuska 2 Introduction u Simplified view of Speech Production (see Figure 3.1 in the next slide) n Lungs act as a power supply and provide airflow to the larynx stage. n Larynx modulates airflow and provides either: u Periodic puff-like airflow, or u Noisy airflow to vocal tract. n Vocal-tract gives the modulated airflow its color (spectrally shaping the source) with: u Oral, u Nasal, and u Pharynx cavities. 2/13/12 Veton Kpuska 3 Figure 3.1 2/13/12 Veton Kpuska 4 Introduction u Sound sources can also be generated by constrictions and boundaries that are made within the vocal tract itself: n Periodic source, n Noisy source, or n Impulsive airflow source. u Note that speech production mechanism does not generate a perfect periodic, impulsive, or noisy source. u Three general categories of the source for speech sounds: 1. Periodic 2. Noisy 3. Impulsive n. Illustration of each in the word shop: u sh noisy u o periodic u p - impulse 2/13/12 Veton Kpuska 5 Example of Shop Noise like signal Period Source Impulse Source 2/13/12 Veton Kpuska 6 Introduction u Distinguishable speech sounds are determined n not only by source, but n also by different vocal tract configurations, n and combination of both. u Speech sound classes are referred to as phonemes . u Phonemics is the discipline that studies phoneme realizations (e.g., in a language). u Each phoneme class provides a certain meaning in a word. u Within a phoneme class there exist many sound variations that provide the same meaning. The study of these sound variations is called phonetics . u Phonemes are the basic building blocks of a language: n They are concatenated (more or less), as discrete elements into words, n According to a certain phonemic and grammatical rules. Introduction u This chapter will cover: n Description of speech production mechanism n Resulting variety of phonetic sound patterns n How these sounds differ among different speakers. 2/13/12 Veton Kpuska 7 Anatomy and Physiology of Speech Production 2/13/12 Veton Kpuska 8 2/13/12 Veton Kpuska 9 Anatomy and Physiology of Speech Production u Anatomy of speech production is shown in Figure 3.2 u Lungs: n Inhalation and exhalation of air. n Connected through trachea (windpipe) and epiglottis to Vocal Tract....
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Ch3-Production_and_Classification_of_Speech_Sounds - Speech...

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