الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
Speech signals are the most important signals in today’s and tomorrow’s telecommunication.This results from the fact that human communication is the basis of all communication systems.This man-man communication will be in the future combined with efficient man-machine communication.
.The Process of Speech Production
Speech signals are composed of a sequence of sounds.These sounds and the transistion between them serves as a symbolic representations of information.The arrangement of these sounds is governed by the rules of the language.
in processing speech to enhance or extract information it is useful to have as much knowlege as possible about the structure of speech signals,.i.e.,about the way in which information are encoded in the signal. Thus, it is useful to study the mechanism of speech production and the main classes of speech sounds.
2. Digital Transmission and Storage of Speech Signals
One of the earliest and most important applications ofOne of the earliest and most important applications of speech processing is the vocoder or voiced coder invented by