Wake on voice key phrase segmentation

At least one non-transitory computer readable storage medium comprising instructions that, when executed, cause one or more processors to at least:

• extract feature vectors from time segments of an audio signal;
• determine an acoustic score indicative of probabilities of a phonetic class associated with respective ones of the time segments based on the feature vectors;
• determine scored model states based on detection of phonetic units associated with a corresponding one of the acoustic scores;
• generate a progression of the scored model states;
• detect a pattern based on the progression of scored model states;
• perform a comparison of the detected pattern and a reference pattern;
• and
• determine a starting point and an ending point for the key phrase based on the comparison.

A key phrase detection circuit comprising:

• a feature extraction circuit to extract feature vectors from time segments of an audio signal;
• an acoustic modeling scoring neural network to:
• determine an acoustic score indicative of probabilities of a phonetic class associated with respective ones of the time segments based on the feature vectors;
• and
• determine scored model states based on detection of phonetic units associated with a corresponding one of the acoustic scores;
• a key phrase scoring circuit to generate a progression of the scored model states;
• a key phrase segmentation circuit to:
• detect a pattern based on the progression of scored states;
• perform a comparison of the detected pattern and a reference pattern;
• and
• determine a starting point and an ending point for the key phrase based on the comparison.