Assignee: Dragon Systems, Inc.

Location: Newton, MA
No. of patents: 48

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Number	Title	Issue Date
7120582	Expanding an effective vocabulary of a speech recognition system The invention provides techniques for creating and using fragmented word models to increase the effective size of an active vocabulary of a speech recognition system. The active vocabulary represents all words and word fragments that the speech recognition system is...	10/10/2006
6224636	Speech recognition using nonparametric speech models The content of a speech sample is recognized using a computer system by evaluating the speech sample against a nonparametric set of training observations, for example, utterances from one or more human speakers. The content of the speech sample is recogni...	05/01/2001
6212498	Enrollment in speech recognition Enrolling a user in a speech recognition system includes analyzing acoustic content of a user utterance and determining whether the utterance matches a portion of an enrollment text. If the user utterance matches a portion of the enrollment text, the acou...	04/03/2001
6195635	User-cued speech recognition Recognition of speech by a speech recognizer is improved by receiving deliberately contiguously repeated spoken utterances corresponding to a speech element and recognizing fewer instances of the speech element than the number of repeated spoken utterance...	02/27/2001
6167377	Speech recognition language models Language model results are combined according to a combination expression to produce combined language model results for a set of candidates. A candidate is selected and the combination expression is adjusted using language model results associated with t...	12/26/2000
6163768	Non-interactive enrollment in speech recognition A computer enrolls a user in a speech recognition system by obtaining data representing a user's speech, the speech including multiple user utterances and generally corresponding to an enrollment text, and analyzing acoustic content of data corresponding ...	12/19/2000
6151575	Rapid adaptation of speech models A source-adapted model for use in speech recognition is generated by defining a linear relationship between a first element of an initial model and a first element of the source-adapted model. Thereafter, speech data that corresponds to the first element ...	11/21/2000
6122613	Speech recognition using multiple recognizers (selectively) applied to the same input sample A speech sample is recognized with a computer system by processing the speech sample with at least two speech recognizers, each of which has a different performance characteristic. One speech recognizer may be a large-vocabulary, continuous speech recogni...	09/19/2000
6112172	Interactive searching A user searches searchable information representing underlying information using an interactive user interface, which indicates to the user which parts of the searchable information represent information in the underlying information that is of interest t...	08/29/2000
6101468	Apparatuses and methods for training and operating speech recognition systems A word recognition system can: respond to the input of a character string from a user by limiting the words it will recognize to words having a related, but not necessarily the same, string; score signals generated after a user has been prompted to genera...	08/08/2000
6092044	Pronunciation generation in speech recognition A method of adding a word to a speech recognition vocabulary includes creating a collection of possible phonetic pronunciations from a spelling of the word and using speech recognition to find a pronunciation from the collection that best matches an utter...	07/18/2000
6092043	Apparatuses and method for training and operating speech recognition systems A word recognition system can: respond to the input of a character string from a user by limiting the words it will recognize to words having a related, but not necessarily the same, string, score signals generated after a user has been prompted to genera...	07/18/2000
6088671	Continuous speech recognition of text and commands In a method for use in recognizing continuous speech, signals are accepted corresponding to interspersed speech elements including text elements corresponding to text to be recognized and command elements corresponding to commands to be executed. The elem...	07/11/2000
6073097	Speech recognition system which selects one of a plurality of vocabulary models A word recognition system can: respond to the input of a character string from a user by limiting the words it will recognize to words having a related, but not necessarily the same, string; score signals generated after a user has been prompted to genera...	06/06/2000
6064959	Error correction in speech recognition Incorrect text associated with recognition errors in computer-implemented speech recognition is corrected by performing speech recognition on an utterance to produce a recognition result for the utterance. When a correction command is identified in the re...	05/16/2000
6052657	Text segmentation and identification of topic using language models System for segmenting text and identifying segment topics that match a user-specified topic. Topic tracking system creates a set of topic models from training text containing topic boundaries using a clustering algorithm. User supplies topic text. System ...	04/18/2000
6029124	Sequential, nonparametric speech recognition and speaker identification A speech sample is evaluated using a computer. Training data that include samples of speech are received and stored along with identification of speech elements to which portions of the training data are related. A speech sample is received and speech rec...	02/22/2000
5983179	Speech recognition system which turns its voice response on for confirmation when it has been turned off without confirmation A speech recognition system includes a speech-response capability for responding to sounds which appear to match models of spoken words by performing functions associated with such words. This speech response can be turned on or off. If the system detects...	11/09/1999
5960394	Method of speech command recognition with dynamic assignment of probabilities according to the state of the controlled applications A word recognition system is disclosed for converting spoken utterances into either text or commands. The system runs on a platform capable of running a plurality applications. Text and commands are sent from a word recognition application to one or more ...	09/28/1999
5946654	Speaker identification using unsupervised speech models A speech model is produced for use in determining whether a speaker associated with the speech model produced an unidentified speech sample. First a sample of speech of a particular speaker is obtained. Next, the contents of the sample of speech are ident...	08/31/1999
5920837	Word recognition system which stores two models for some words and allows selective deletion of one such model A computerized word recognition system, such as a speech recognition system, stores word models of a first and second set for each of a plurality of vocabulary words. The system has a user interface which enable a user to selectively prevent the use of a ...	07/06/1999
5920836	Word recognition system using language context at current cursor position to affect recognition probabilities A computerized system performs word recognition. It does pattern matching to select which vocabulary words appears, according to the pattern matching, to most probably correspond to word signals it seeks to recognize. It produces an output corresponding t...	07/06/1999
5915236	Word recognition system which alters code executed as a function of available computational resources A word recognition system detects the computational resources available to it, such as the speed or number of processors, or whether there is DSP hardware, and alters the instructions it executes in response. The system can be a word recognition program d...	06/22/1999
5909666	Speech recognition system which creates acoustic models by concatenating acoustic models of individual words A computerized speech recognition system creates acoustic models of phrases by concatenating acoustic models for individual words. The system stores an acoustic word model and spelling for each of its vocabulary words. When it receives the spelling of a m...	06/01/1999
5903864	Speech recognition A method of speech recognition includes recognizing a first utterance, recognizing a second utterance having information that is related to the first utterance, and determining the most probable first and second utterances based on stored information abou...	05/11/1999
5850627	Apparatuses and methods for training and operating speech recognition systems A word recognition system can: respond to the input of a character string from a user by limiting the words it will recognize to words having a related, but not necessarily the same, string; score signals generated after a user has been prompted to genera...	12/15/1998
5822730	Lexical tree pre-filtering in speech recognition A speech recognition technique uses lexical tree pre-filtering to obtain lists of words for use in performing speech recognition. The lexical tree pre-filtering includes representing a vocabulary of words using a lexical tree and identifying a first subse...	10/13/1998
5818423	Voice controlled cursor movement An element (e.g., a location pointer in a windowed graphical user interface) shown on a computer display is moved toward a target position. A user's input is recognized which identifies a subregion of the display in which the target position is located. T...	10/06/1998
5799279	Continuous speech recognition of text and commands In a method for use in recognizing continuous speech, signals are accepted corresponding to interspersed speech elements including text elements corresponding to text to be recognized and command elements corresponding to commands to be executed. The elem...	08/25/1998
5794189	Continuous speech recognition A method for use in recognizing speech in which signals are accepted corresponding to interspersed speech elements including text elements corresponding to text to be recognized and command elements to be executed. The elements are recognized. Modificatio...	08/11/1998
5765132	Building speech models for new words in a multi-word utterance Words are added to a speech recognition system vocabulary during user dictation by (a) extracting, from a multi-word user utterance, speech frames that correspond to each one of the one or more new words; and (b) building speech models for the one or more...	06/09/1998
5754972	Speech recognition system for languages with compound words A system and associated methods for recognizing compound words from an utterance containing a succession of one or more words from a predetermined vocabulary. At least one of the words in the utterance is a compound word including at least two formatives ...	05/19/1998
5715367	Apparatuses and methods for developing and using models for speech recognition A computerized system time aligns frames of spoken training data against models of the speech sounds; automatically selects different sets of phonetic context classifications which divide the speech sound models into speech sound groups aligned against ac...	02/03/1998
5680511	Systems and methods for word recognition In one aspect, the invention provides word recognition systems that operate to recognize an unrecognized or ambiguous word that occurs within a passage of words. The system can offer several words as choice words for inserting into the passage to replace ...	10/21/1997
5526463	System for processing a succession of utterances spoken in continuous or discrete form The system of the invention relates to continuous speech pre-filtering systems for use in discrete and continuous speech recognition computer systems. The speech to be recognized is converted from utterances to frame data sets, which frame data sets are s...	06/11/1996
5428707	Apparatus and methods for training speech recognition systems and their users and otherwise improving speech recognition performance A tutorial instructs how to use a word recognition system, such as one for speech recognition. It specifies a set of allowed response words for each of a plurality of states. It sends messages on how to use the recognizer in certain states, and, in others...	06/27/1995
5202952	Large-vocabulary continuous speech prefiltering and processing system A continuous speech prefiltering system for use in continuous speech recognition computer systems. The speech to be recognized is converted from utterances to frame data sets, which frame data sets are smoothed to generate a smooth frame model over a pred...	04/13/1993
5027406	Method for interactive speech recognition and training A method for creating word models for a large vocabulary, natural language dictation system. A user with limited typing skills can create documents with little or no advance training of word models. As the user is dictating, the user speaks a word which m...	06/25/1991
4914703	Method for deriving acoustic models for use in speech recognition The invention provides a method of deriving generally improved statistical acoustic model of a first class of speech sounds, given a limited amount of sampling data from that first class. This is done by combining a first statistic calculated from samples...	04/03/1990
4903305	Method for representing word models for use in speech recognition A method is provided for deriving acoustic word representations for use in speech recognition. Initial word models are created, each formed of a sequence of acoustic sub-models. The acoustic sub-models from a plurality of word models are clustered, so as ...	02/20/1990

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Assignee: Dragon Systems, Inc.