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<Paper uid="C94-2159">
  <Title>PAUSE AS A PHRASE DEMARCATOR FOR SPEECH AND LANGUAGE PROCESSING</Title>
  <Section position="6" start_page="990" end_page="990" type="concl">
    <SectionTitle>
4 CONCLUSION
</SectionTitle>
    <Paragraph position="0"> 2'o treat spontaneous speech understauding we have two main problems: the absence of a common proceasing unit gJ.lld insuflieieilt knowle.dge of spoutarictus speech fcatarea.</Paragraph>
    <Paragraph position="1"> We have proposed pauses as i)hrase detYlarcatol's and interpausM phrases as common processing units to allow integration of speech recognition and language processing in the processing of spontaneous speech understand\[us. We demonstrated the adwmgages of processing based on iutcrpausaI phrases using examples taken from spontameous speech dialogues containing 3,541 words. Using the same data, we studied certain features of spoken language, such as tilled pauses and fragmentary utterances. Based on the study, we prepared three difDrent CFG rule se.ts for preliminary speech recognition experiments. In all three sets, rules have been explicitly modified to represent pausal phenomena. Tiw. first set eolltaiiis only such modifications, while the other two sets acid tile addit, ional spontaneous feature each: rise of the emphasis marker desune after a noun phrase or post-positional utterances at the end of a turn. For 118 sel/tences, sel/tence reco~llitioll acctlracy \['or pause-based rules was considerably less than the accuracy obtidned in earlier buTiseisu-based tests using mandatory pauses at b~tn.selslt boundaries; but flirt, her loss of accuracy caused by incorporating the spontaneous features was minor.</Paragraph>
    <Paragraph position="2"> We believe that the loss of speech recognition accuracy for sentences seen in our pause-based exper iments is largely due to the difficulties of eombinlug interpausaI phrase hypotheses. Our r/lies curreiltly eombine interpausal phrases in a relatively unconstrained lllS.unerl tlsillg only weak syutactic COllstraiuts. Based vn filrther study of the structures which precede and follow pauses or filled pauses, we hope t.o provide stronger syntactic constraints in the ftit'dre.</Paragraph>
  </Section>
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