Ch4-Phonetics

Ch4-Phonetics - Search and Decoding in Speech Recognition...

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Unformatted text preview: Search and Decoding in Speech Recognition Phonetics February 13, 2012 Veton Kpuska 2 Phonetics Whole Word (logo-graphic) Written Systems: The earliest independently-invented writing systems (Sumerian, Chinese, Mayan) were mainly logographic: one symbol represented a whole word. Systems Representing Sounds: But from the earliest stages we can find, most such systems contain elements of syllabic or phonemic writing systems, in which symbols are used to represent the sounds that make up the words. Thus the Sumerian symbol pronounced ba, meaning ration, could also function purely as the sound /ba/. Even modern Chinese, which remains primarily logographic, uses sound-based characters to spell out foreign words. February 13, 2012 Veton Kpuska 3 Sound Based Systems Purely sound-based writing systems: Syllabic (like Japanese hiragana or katakana ), Alphabetic (like the Roman alphabet used in this book), or Consonantal (like Semitic writing systems), can generally be traced back to these early logo-syllabic systems, often as two cultures came together. Thus the Arabic, Aramaic, Hebrew, Greek, and Roman systems all derive from a West Semitic script that is presumed to have been modified by Western Semitic mercenaries from a cursive form of Egyptian hieroglyphs. The Japanese syllabaries were modified from a cursive form of a set of Chinese characters which were used to represent sounds. These Chinese characters themselves were used in Chinese to phonetically represent the Sanskrit in the Buddhist scriptures that were brought to China in the Tang dynasty. February 13, 2012 Veton Kpuska 4 Sound Based Systems Modern theories of Phonology are based in the Ur-theory of sound-based system in which the word is composed of smaller units of speech. Modern algorithms for Speech recognition (transcribing acoustic waveforms into strings of text words) Speech synthesis or text-to-speech (converting strings of text words into acoustic waveforms) are based on the idea of decomposition of speech and words into smaller units February 13, 2012 Veton Kpuska 5 Phonetics Phonetics is the study of linguistic sounds, how they are produced by the articulators of the human vocal tract, how they are realized acoustically, and how this acoustic realization can be digitized and processed. Computational perspective of phonetics is introduced in this chapter....
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This note was uploaded on 02/11/2012 for the course ECE 5527 taught by Professor Staff during the Fall '11 term at FIT.

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Ch4-Phonetics - Search and Decoding in Speech Recognition...

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