Multi-Stage Speech Recognition System
First Claim
1. A multi-stage recognition method for recognizing a speech signal containing semantic information of two or more classes, comprising:
- detecting and digitizing the speech signal;
providing a database having at least one vocabulary list for each class;
recognizing a portion of the speech signal corresponding to a first class based on a vocabulary list corresponding to the first class, to obtain a first recognition result;
restricting a vocabulary list corresponding to a second class based on the first recognition result; and
recognizing a portion of the speech signal corresponding to the second class based upon the restricted vocabulary list, to obtain a second recognition result.
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Accused Products
Abstract
A multi-stage speech recognition system includes an audio transducer that detects a speech signal, and a sampling circuit that converts the transducer output into a digital speech signal. A spectral analysis circuit identifies a portion of the speech signal corresponding to a first class and a second class. The system includes memory storage or a database having a first and a second vocabulary list. A recognition circuit recognizes the first class based on the first vocabulary list to obtain a first recognition result. A matching circuit restricts a vocabulary list based on the first recognition result, and a recognizing circuit recognizes the second class based on the restricted vocabulary list, to obtain a second recognition result.
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Citations
24 Claims
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1. A multi-stage recognition method for recognizing a speech signal containing semantic information of two or more classes, comprising:
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detecting and digitizing the speech signal; providing a database having at least one vocabulary list for each class; recognizing a portion of the speech signal corresponding to a first class based on a vocabulary list corresponding to the first class, to obtain a first recognition result; restricting a vocabulary list corresponding to a second class based on the first recognition result; and recognizing a portion of the speech signal corresponding to the second class based upon the restricted vocabulary list, to obtain a second recognition result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A computer-readable storage medium having processor executable instructions to perform multi-stage recognition of a speech signal containing semantic information of two or more classes, by performing the acts of:
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detecting and digitizing the speech signal; providing a database having at least one vocabulary list for each class; recognizing a portion of the speech signal corresponding to a first class based on a vocabulary list corresponding to the first class, to obtain a first recognition result; restricting a vocabulary list corresponding to a second class based on the first recognition result; and recognizing a portion of the speech signal corresponding to the second class based upon the restricted vocabulary list, to obtain a second recognition result. - View Dependent Claims (18, 19, 20)
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21. A system for multi-stage speech recognition, comprising:
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an audio transducer configured to detect a speech signal; a sampling circuit configured to digitize the detected speech signal; a database configured to store at least a first and a second vocabulary list; a spectral analysis circuit configured to identify a portion of the speech signal corresponding to a first class and a second class; a recognition circuit configured to recognize the first class based on the first vocabulary list to obtain a first recognition result; a matching circuit configured to restrict at least one vocabulary list other than the first vocabulary list, based on the first recognition result; and the recognizing circuit configured to recognize the second class based on the restricted vocabulary list, to obtain a second recognition result. - View Dependent Claims (22, 23, 24)
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Specification