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Human language, as a typical complex system, its organization and evolutionis an attractive topic for both physical and cultural researchers. In thispaper, we present the first exhaustive analysis of the text organization ofhuman speech. Two important results are that: (i) the construction andorganization of spoken language can be characterized as Zipf's law and Heaps'law, as observed in written texts; (ii) word frequency vs. rank distributionand the growth of distinct words with the increase of text length showssignificant differences between book and speech. In speech word frequencydistribution are more concentrated on higher frequency words, and the emergenceof new words decreases much rapidly when the content length grows. Based onthese observations, a new generalized model is proposed to explain thesecomplex dynamical behaviors and the differences between speech and book.

Scaling laws in human speech, decreasing emergence of new words and a generalized model