Recently I've focused on a project to implement a keyword spotting system. I've used HTK for speech recognition earlier. Now I want to know is it possible to implement my keyword spotter using HTK?
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Speech recognition and keyword spotting are quite related problems.
For HTK one of the two solutions is possible:
build a word-loop grammar with a list of words you want to search, a garbage and a silence unit. See HBuild in HTKbook for details
do a conventional speech decoding, which produces a word lattice (.slf in HTK). Then convert it in a consensus network (a sausage) with, for example lattice-tool, and search the words that have a score above some threshold