7. The system of claim 6 , further wherein the one or more processors are further programmed by the executable instructions to determine, based at least partly on speech recognition processing using the traceback data, that the sequence of feature vectors represents audio data corresponding to the keyword.
6. The system of claim 1 , wherein the one or more processors are further programmed by the executable instructions generate traceback data linking the particular feature vector to a previous feature vector preceding the particular feature vector in the subset.