Speech recognition in selective call systems
First Claim
1. A method for performing speech recognition by using an acoustic space having a plurality of probability density functions (pdfs), comprising the steps of:
- dividing the acoustic space into a plurality of regions;
determining at least one region of the plurality of regions to which a probability density function belongs by determining when the probability density function has a minimum distance to the at least one of the plurality of regions wherein the probability density functions of each region comprise a subset of the plurality of probability density functions;
generating a hierarchical tree structure representing the subset of the probability density functions associated with the plurality of regions;
receiving a speech sample;
determining the region of the plurality of regions by traversing the hierarchical tree structure in which the speech sample has the minimum distance to a center of the region; and
calculating the subset of probability density functions of the region for recognizing the speech sample received.
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Abstract
A selective call communication system (100) has a speech recognition system using an acoustic space (400) which has a plurality of probability density functions (pdfs). The selective call communication system (100) has an acoustic space generator (136) for representing speech in the acoustic space (400) which has a plurality of regions (1-14) having a subset of the plurality of probability density functions (502-516). The selective call communication system (100) has a tree generator (138) for generating a hierarchical tree structure (500) representing the subset of the plurality of probability density functions (502-516) associated with the plurality of regions (1-14), a score computer (132) for determining a region of the plurality of regions (1-14) indicative of a minimum distance to a center of the region for a speech sample received, and a speech recognizer (130) for calculating the probability density functions of the region for recognizing the speech sample received.
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Citations
20 Claims
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1. A method for performing speech recognition by using an acoustic space having a plurality of probability density functions (pdfs), comprising the steps of:
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dividing the acoustic space into a plurality of regions; determining at least one region of the plurality of regions to which a probability density function belongs by determining when the probability density function has a minimum distance to the at least one of the plurality of regions wherein the probability density functions of each region comprise a subset of the plurality of probability density functions; generating a hierarchical tree structure representing the subset of the probability density functions associated with the plurality of regions; receiving a speech sample; determining the region of the plurality of regions by traversing the hierarchical tree structure in which the speech sample has the minimum distance to a center of the region; and calculating the subset of probability density functions of the region for recognizing the speech sample received. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for performing speech recognition by using an acoustic space having a plurality of probability density functions (pdfs), comprising the steps of:
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dividing the acoustic space into an at least two regions, the at least two regions; determining a region of the at least two regions to which a probability density function belongs by determining when the probability density function has a minimum distance from a center of one of the at least two wherein the probability density functions of each region comprises a subset of the plurality of probability density functions; generating a hierarchical tree structure associated with the at least two regions of the acoustic space wherein the at least two regions having a center comprising a list of pdf of the plurality of pdfs generated by Hidden Markov Model (HMM); receiving a speech data; using the hierarchical tree structure for determining a region of the at least two regions in which the received speech data has a minimum distance from the center; retrieving the list of pdfs associated with the region; and calculating the pdfs from the list of pdfs for determining a likelihood of the received speech data belonging to the pdfs of the region. - View Dependent Claims (9, 10)
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11. A selective call communication system having speech recognition using an acoustic space comprising a plurality of probability density functions (pdfs), the selective call communication system, comprising:
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an acoustic space generator for representing speech in the acoustic space, the acoustic space is divided into a plurality of regions, each of the plurality of regions having a subset of the plurality of probability density functions, the subset of the plurality of probability density functions are associated with a region of the plurality of regions by determining when a probability density function has a minimum distance to the region; a tree generator for generating a hierarchical tree structure representing the subset of the plurality of probability density functions associated with the plurality of regions; a score computer for determining the region of the plurality of regions by traversing the hierarchical tree structure in which the speech sample has the minimum distance to a center of the region; and a speech recognizer for calculating the subset of the plurality of probability density functions of the region for recognizing the speech sample received. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A selective call communication system for performing speech recognition using an acoustic space having a plurality of probability density functions (pdfs), the selective call communication system comprising:
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an acoustic space generator for representing speech in the acoustic space and dividing the acoustic space into at least two regions and assigning each region a center, a list of the plurality of probability density functions are associated with a region of the plurality of regions by determining when a probability density function has a minimum distance from the center of the region; a tree generator for generating a hierarchical tree structure associated with the at least two regions of the acoustic space; a front-end processor for receiving speech data; a speech recognizer for using the hierarchical tree structure for determining a region of the at least two regions in which the received speech data has the minimum distance from the center; a score computer for retrieving the list of the plurality of pdfs associated with the region; and a hypotheses searcher for calculating pdfs from the list of the plurality of pdfs using the hierarchical tree structure for determining a likelihood of the speech data belonging to the plurality of pdfs of the region. - View Dependent Claims (19, 20)
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Specification