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US 2008/0189109 A1Published application
Segmentation posterior based boundary point determination
AssigneeMicrosoft Corporation
InventorsYu Shi, Frank Kao-Ping Soong
Life of this patent
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Abstract
Boundary points for speech in an audio signal are determined based on posterior probabilities for the boundary points given a set of possible segmentations of the audio signal. The boundary point posterior probability is determined based on a set of level posterior probabilities that each provide the probability of a sequence of feature vectors given one of the segmentations in the set of possible segmentations.
Claims20
A method comprising:
- performing multiple segmentations of a sequence of feature vectors that represent an audio signal, each segmentation providing at least one segment boundary that is different from segment boundaries in other segmentations;
- determining a separate segmentation probability for each segmentation, each segmentation probability providing the probability of the sequence of feature vectors given the segmentation;
- determining a boundary point posterior probability for a possible boundary point of speech by summing over the segmentation probabilities for a set of segmentations that segment the sequence of feature vectors such that the possible boundary point represents a boundary point for speech in the segmentation;
- and
- using the boundary point posterior probability to select a possible boundary point of speech as a boundary point of speech.
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A computer-readable medium having computer-executable instructions for performing steps comprising:
- selecting a boundary point for speech in an audio signal from a plurality of possible boundary points found in a plurality of possible segmentations of the audio signal;
- forming a summation of probabilities that is limited to probabilities associated with segmentations in the plurality of possible segmentations in which the selected possible boundary point is positioned as a boundary point;
- using the summation of probabilities to determine a probability that the selected possible boundary point is a boundary point for speech;
- and
- using the probability that the selected possible boundary point is a boundary point for speech to set a boundary point for speech in the audio signal.
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A method comprising:
- determining a maximum number of segments that can be found in segmentations used to determine the probability of a possible boundary point of speech in an audio signal based in part on distortion measures for a plurality of segmentations;
- determining probabilities for a plurality of segmentations that have fewer than the maximum number of segments;
- using the probabilities for the plurality of segmentations to determine a probability for each of at least two boundary points;
- and
- selecting one of the at least two boundary points as a boundary point of speech in the audio signal based on the probabilities for the at least two boundary points.
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Dependencies are inferred from the claim text.