Abstract
In digital telephony, speech is handled in digital form. Accordingly, the speech from the telephone transmitter must be converted from its analog waveform to a series of ones and zeros. A multitude of speech digitization methods has been devised; these methods can be categorized as waveform, parametric, and hybrid coding. A waveform coder takes the actual waveform and produces a series of ones and zeros representative of that waveform according to a set of rules. A parametric coder, sometimes called a source coder, attempts to detect certain characteristics of speech, such as pitch and amplitude, and produces a series of ones and zeros according to a set of rules that describes the detected speech characteristics rather than the waveform. A hybrid coder is one that uses both waveform and parametric principles in its production of a digital version of speech.
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References
Flanagan, J. L., “Opportunities and Issues in Digitized Voice,” IEEE-EASCON ‘78 Record, pp. 709–712.
Flanagan, J. L., et al., “Speech Coding,” IEEE Trans. Comm., Vol. COM-27, No. 4, p. 729 (April, 1979).
Bellamy, J. C., Digital Telephony, John Wiley & Sons, Inc., New York, N.Y., 1982.
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© 1995 Springer Science+Business Media New York
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Keiser, B.E., Strange, E. (1995). Speech Digitization Fundamentals. In: Digital Telephony and Network Integration. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1787-0_2
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DOI: https://doi.org/10.1007/978-1-4615-1787-0_2
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