19 Nov
1999
Sphinx
Speech Group, CMU-SCS (rkm@cs.cmu.edu)
·Each
word exit recorded in the BP table:
·Upon
transitioning from an exited word A
to another B:
·Inject
pointer to BP table entry for A
into start state of B. (This identifies the predecessor of B.)
·Propagate these pointers along with
path-scores during Viterbi search
·At end of utterance,
identify best exited word and trace back using predecessor pointers
The Backpointer Table
time
Word ID Path Score Predecessor
BP Entry
BP table entry