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 February 13, 2012 Veton Kpuska 2 Introduction Simplified view of Speech Production (see Figure 3.1 in the next slide) Lungs act as a power supply and provide airflow to the larynx stage. Larynx modulates airflow and provides either: Periodic puff-like airflow, or Noisy airflow to vocal tract. Vocal-tract gives the modulated airflow its color (spectrally shaping the source) with: Oral, Nasal, and Pharynx cavities. February 13, 2012 Veton Kpuska 3 Figure 3.1 February 13, 2012 Veton Kpuska 4 Introduction Sound sources can also be generated by constrictions and boundaries that are made within the vocal tract itself: Periodic source, Noisy source, or Impulsive airflow source. Note that speech production mechanism does not generate a perfect periodic, impulsive, or noisy source. Three general categories of the source for speech sounds: 1. Periodic 2. Noisy 3. Impulsive Illustration of each in the word shop: sh noisy o periodic p - impulse February 13, 2012 Veton Kpuska 5 Example of Shop Noise like signal Period Source Impulse Source February 13, 2012 Veton Kpuska 6 Introduction Distinguishable speech sounds are determined not only by source, but also by different vocal tract configurations, and combination of both. Speech sound classes are referred to as phonemes . Phonemics is the discipline that studies phoneme realizations (e.g., in a language). Each phoneme class provides a certain meaning in a word. Within a phoneme class there exist many sound variations that provide the same meaning. The study of these sound variations is called phonetics . Phonemes are the basic building blocks of a language: They are concatenated (more or less), as discrete elements into words, According to a certain phonemic and grammatical rules. This chapter will cover: Description of speech production mechanism Resulting variety of phonetic sound patterns How these sounds differ among different speakers. February 13, 2012 Veton Kpuska 7 Anatomy and Physiology of Speech Production Anatomy of speech production is shown in Figure 3.2 Lungs: Inhalation and exhalation of air. 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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