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| Number | Title | Issue Date |
| 5465317 | Speech recognition system with improved rejection of words and sounds not in the system vocabulary A speech recognizer that selects a command model for a current sound if the best match score for the current sound exceeds its corresponding threshold score. The threshold score is assigned a confidence score based on the best match score and recognition ... | 11/07/1995 |
| 5459809 | Character recognition system and method therefor accommodating on-line discrete and cursive handwritten Hidden Markov models (HMMs) are used in a system for recognizing on-line English characters. Input data from a tablet is represented as chain codes and HMMs are trained in character units for recognition. During HMM training, imaginary strokes are inserte... | 10/17/1995 |
| 5455889 | Labelling speech using context-dependent acoustic prototypes The present invention relates to labelling of speech in a context-dependent speech recognition system. When labelling speech using context-dependent prototypes the phone context of a frame of speech needs to be aligned with the appropriate acoustic parame... | 10/03/1995 |
| 5452397 | Method and system for preventing entry of confusingly similar phases in a voice recognition system vocabulary list A method and system prevent the entry of confusingly similar phrases (60) in a vocabulary list (10) of a speaker-dependent voice recognition system. The method first receives (20, 30, 50) and enrolls the phrase (60) for adding to vocabulary list (10). Nex... | 09/19/1995 |
| 5450523 | Training module for estimating mixture Gaussian densities for speech unit models in speech recognition systems A model-training module generates mixture Gaussian density models from speech training data for continuous, or isolated word speech recognition systems. Speech feature sequences are labeled into segments of states of speech units using Viterbi-decoding ba... | 09/12/1995 |
| 5440663 | Computer system for speech recognition The invention concerns a computer system for speech recognition with a word table and a triphone table in its memory. In response to a new word not contained in the word table and which is encountered by the computer system during recognition of an unknow... | 08/08/1995 |
| 5440662 | Keyword/non-keyword classification in isolated word speech recognition A two-pass classification system and method that post-processes HMM scores with additional confidence scores to derive a value that may be applied to a threshold on which a keyword verses non-keyword determination may be based. The first stage comprises G... | 08/08/1995 |
| 5425129 | Method for word spotting in continuous speech A digitized speech data channel is analyzes for the presence of words or phrases from a desired list. If the word is not present the speech time series from the channel, there is a high probability of matching the input data to phonemic noise markers rath... | 06/13/1995 |
| 5390279 | Partitioning speech rules by context for speech recognition Partitioning speech recognition rules for generation of a current language model and interpretation in a speech recognition system. Contexts for each of speech recognition rules are determined when each of the speech rules will be active. At one interval ... | 02/14/1995 |
| 5389562 | Double heterojunction bipolar transistor and the method of manufacture therefor A Double Heterojunction Bipolar Transistor (DHBT) and the method of fabrication therefor. First a layered wafer is prepared on a semi-insulating GaAs substrate. The bottom wafer layer is n+ GaAs, followed by n- AlGaAs, a thin layer o... | 02/14/1995 |
| 5390278 | Phoneme based speech recognition A flexible vocabulary speech recognition system is provided for recognizing speech transmitted via the public switched telephone network. The flexible vocabulary recognition (FVR) system is a phoneme based system. The phonemes are modelled as hidden Marko... | 02/14/1995 |
| 5381513 | Time series signal analyzer including neural network having path groups corresponding to states of Markov chains A neural network with a high recognition rate when applied to static patterns is made applicable to dynamic time series patterns such as voice signals. Plural units with one or more inputs and outputs are interconnected, and a unique load coefficient is a... | 01/10/1995 |
| 5353377 | Speech recognition system having an interface to a host computer bus for direct access to the host memory A signal processing card packaged on a bus of a personal computer has a bus master which is used to access the main memory of the personal computer. A large table of probability values required for speech recognition is held in the main memory. When a lab... | 10/04/1994 |
| 5345537 | Network reformer and creator A user inputs a network to an inputter of a network reformer for automatically reforming a network connecting basic units of data per a predetermined rewriting rule. The inputter sends the data to a partial path separator. The partial path separator separ... | 09/06/1994 |
| 5333236 | Speech recognizer having a speech coder for an acoustic match based on context-dependent speech-transition acoustic models A speech coding apparatus compares the closeness of the feature value of a feature vector signal of an utterance to the parameter values of prototype vector signals to obtain prototype match scores for the feature vector signal and each prototype vector s... | 07/26/1994 |
| 5307444 | Voice analyzing system using hidden Markov model and having plural neural network predictors An analyzing system analyzes object signals, particularly voice signals, by estimating a generation likelihood of an observation vector sequence being a time series of feature vectors with use of a Markov model having a plurality of states and given trans... | 04/26/1994 |
| 5293452 | Voice log-in using spoken name input A voice log-in system is based on a person's spoken name input only, using speaker-dependent acoustic name recognition models in a performing speaker-independent name recognition. In an enrollment phase, a dual pass endpointing procedure defines both the ... | 03/08/1994 |
| 5228087 | Speech recognition apparatus and methods Speech recognition is carried out by performing a first analysis of a speech signal using a Hidden Semi Markov Model and an asymmetric time warping algorithm. A second analysis is also performed using Multi-Layer Perceptron techniques in conjunction with ... | 07/13/1993 |
| 5212730 | Voice recognition of proper names using text-derived recognition models A name recognition system (FIG. 1 )used to provide access to a database based on the voice recognition of a proper name spoken by a person who may not know the correct pronunciation of the name. During an enrollment phase (10), for each name-text entered ... | 05/18/1993 |
| 5199077 | Wordspotting for voice editing and indexing A technique for wordspotting based on hidden Markov models (HMM's). The technique allows a speaker to specify keywords dynamically and to train the associated HMM's via a single repetition of a keyword. Non-keyword speech is modeled using an HMM trained f... | 03/30/1993 |
| 5165007 | Feneme-based Markov models for words In a speech recognition system, apparatus and method for modelling words with label-based Markov models is disclosed. The modelling includes: entering a first speech input, corresponding to words in a vocabulary, into an acoustic processor which converts ... | 11/17/1992 |
| 5129002 | Pattern recognition apparatus A pattern recognition apparatus using the hidden Markov model technique in which parameters for defining a mean vector representing the probability density function in each one of plural states for composing the hidden Markov model vary with time. Accordi... | 07/07/1992 |
| 5033087 | Method and apparatus for the automatic determination of phonological rules as for a continuous speech recognition system A continuous speech recognition system includes an automatic phonological rules generator which determines variations in the pronunciation of phonemes based on the context in which they occur. This phonological rules generator associates sequences of labe... | 07/16/1991 |
| 5031217 | Speech recognition system using Markov models having independent label output sets A speech recognition system measures the values of at least two classes of features of an utterance: (1) a first class whose value is related to the frequency spectrum of the utterance, and (2) a second class whose value is related to the variation with t... | 07/09/1991 |
| 5029212 | Continuous speech recognition unit using forward probabilities A continuous speech recognition unit using forward probabilities for recognizing continuous speech associated with standard patterns for given units of recognition comprises a standard template memory for storing Markov model standard templates of standar... | 07/02/1991 |
| 4977599 | Speech recognition employing a set of Markov models that includes Markov models representing transitions to and from silence Apparatus and method for constructing word baseforms which can be matched against a string of generated acoustic labels. A set of phonetic phone machines are formed, wherein each phone machine has (i) a plurality of states, (ii) a plurality of transitions... | 12/11/1990 |
| 4972485 | Speaker-trained speech recognizer having the capability of detecting confusingly similar vocabulary words During a training sequence, a speaker-trained speech recognizer detects and signals the speaker when vocabulary word pairs are potentially confusing to the recognizer. Each vocabulary word is converted into feature signals and then parameters representing... | 11/20/1990 |
| 4833712 | Automatic generation of simple Markov model stunted baseforms for words in a vocabulary In a system that (i) defines each word in a vocabulary by a fenemic baseform of fenemic phones, (ii) defines an alphabet of composite phones each of which corresponds to at least one fenemic phone, and (iii) generates a string of fenemes in response to sp... | 05/23/1989 |
| 4829577 | Speech recognition method Speaker adaptation which enables a person to use a Hidden Markov model type recognizer previously trained by another person or persons. During initial training, parameters of Markov models are calculated iteratively by, for example, using the Forward-Back... | 05/09/1989 |
| 4819271 | Constructing Markov model word baseforms from multiple utterances by concatenating model sequences for word segments The present invention relates to apparatus and method for segmenting multiple utterances of a vocabulary word in a consistent and coherent manner and determining a Markov model sequence for each segment. A fenemic Markov model corresponds to each label.... | 04/04/1989 |
| 4783804 | Hidden Markov model speech recognition arrangement Markov model speech pattern templates are formed for speech analysis systems by analyzing identified speech patterns to generate frame sequences of acoustic feature signals representative thereof. The speech pattern template is produced by iteratively gen... | 11/08/1988 |
| 4759068 | Constructing Markov models of words from multiple utterances Speech recognition is improved by splitting each feneme string at a consistent point into a left portion and a right portion. The present invention addresses the problem of constructing fenemic baseforms which take into account variations in pronunciation... | 07/19/1988 |
| 4741036 | Determination of phone weights for markov models in a speech recognition system In a speech recognition system, discrimination between similar-sounding uttered words is improved by weighting the probability vector data stored for the Markov model representing the reference word sequence of phones. The weighting vector is derived for ... | 04/26/1988 |
| 4718094 | Speech recognition system Speech words are recognized by first recognizing each spectral vector identified by a label (feneme), then identifying the word by matching the string of labels against phones using simplified phone machines based on label and transition probabilities and... | 01/05/1988 |
| 4718087 | Method and system for encoding digital speech information Method and system for encoding digital speech information to characterize spoken human speech with an optimally reduced speech data rate while retaining speech quality in the audible reproduction of the encoded digital speech information. Markov modeling ... | 01/05/1988 |
| 4587670 | Hidden Markov model speech recognition arrangement A speech recognizer includes a plurality of stored constrained hidden Markov model reference templates and a set of stored signals representative of prescribed acoustic features of the said plurality of reference patterns. The Markov model template includ... | 05/06/1986 |
| 4348553 | Parallel pattern verifier with dynamic time warping A speech recognition system is disclosed which employs a network of elementary local decision modules for matching an observed time-varying speech pattern against all possible time warpings of the stored prototype patterns. For each elementary speech segm... | 09/07/1982 |
| 4326101 | System for recognizing a word sequence by dynamic programming and by the use of a state transition diagram Operation of a continuous speech recognition system operable according to the dynamic programming technique, is controlled by a state transition diagram in compliance with which word sequences to be recognized by the system with reference to a predetermin... | 04/20/1982 |
| 4156868 | Syntactic word recognizer A syntactic analyzer recognizes a series of spoken words as one of a set of predetermined sequences of prescribed words defined by a state sequence array of state transition signals representing state linked prescribed words. Each sequence corresponds to ... | 05/29/1979 |
