Dynamic match lattice spotting for indexing speech content
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United States of America Patent
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Issued Date -
Aug 2, 2007
app pub date -
Mar 16, 2006
filing date -
Feb 2, 2006
priority date (Note) -
Abandoned
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Abstract
A system for indexing and searching speech content, the system includes two distinct stages, a speech indexing stage (100) and a speech retrieval stage (200). A phone lattice (103) is generated by passing speech content (101) through a speech recogniser (102). The resulting phone lattice is then processed to produce a set of observed sequences Q=(.THETA.,i) where .THETA. are the set of observed phone sequences for each node i in the phone lattice. During the retrieval stage (200), a user first inputs a target word (205) into the system, which is then reduced to a target phone sequence P=(p.sub.1, p.sub.2, . . . , p.sub.N) (207). The system then compares target sequence P with the set of observed sequences Q (208), suitably by scoring each observed sequence against the target sequence using a Minimum Edit Distance (MED) calculation to produce a set of matching sequences R (209).
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