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5956678 Speech recognition apparatus and method using look-ahead scoring  
In the recognition of coherently spoken words, a plurality of hypotheses is usually built up which end in various words during the recognition process and are then to be continued with further...
5956676 Pattern adapting apparatus using minimum description length criterion in pattern recognition processing and speech recognition system  
A pattern adapting apparatus including an input pattern forming unit, a tree structure standard pattern storing unit for storing a tree structure standard pattern including a tree structure...
5950158 Methods and apparatus for decreasing the size of pattern recognition models by pruning low-scoring models from generated sets of models  
Methods and apparatus for producing efficiently sized models suitable for pattern recognition purposes are described. Various embodiments are directed to the automated generation, evaluation, and...
5946655 Method of recognizing a sequence of words and device for carrying out the method  
When a language model is to be used for the recognition of a speech signal and the vocabulary is composed as a tree, the language model value cannot be taken into account before the word end....
5946653 Speaker independent speech recognition system and method  
An improved method of training a SISRS uses less processing and memory resources by operating on vectors instead of matrices which represent spoken commands. Memory requirements are linearly...
5946656 Speech and speaker recognition using factor analysis to model covariance structure of mixture components  
Hidden Markov models (HMMs) rely on high-dimensional feature vectors to summarize the short-time properties of speech correlations between features that can arise when the speech signal is...
5937384 Method and system for speech recognition using continuous density hidden Markov models  
A method and system for achieving an improved recognition accuracy in speech recognition systems which utilize continuous density hidden Markov models to represent phonetic units of speech present...
5933806 Method and system for pattern recognition based on dynamically constructing a subset of reference vectors  
A system and method are used for recognising a time-sequential input pattern (20), which is derived from a continual physical quantity, such as speech. The system has input means (30), which...
5930753 Combining frequency warping and spectral shaping in HMM based speech recognition  
Frequency warping approaches to speaker normalization have been proposed and evaluated on various speech recognition tasks. In all cases, frequency warping was found to significantly improve...
5924067 Speech recognition method and apparatus, a computer-readable storage medium, and a computer- readable program for obtaining the mean of the time of speech and non-speech portions of input speech in the cepstrum dimension  
An apparatus and method for speech recognition includes a device and a step for obtaining a mean of the time of a speech portion in the Cepstrum dimension from the speech portion of the input...
5924066 System and method for classifying a speech signal  
A system and method for classifying a speech signal within a likely speech signal class of a plurality of speech signal classes are provided. Stochastic models include a plurality of states having...
5920839 Word recognition with HMM speech, model, using feature vector prediction from current feature vector and state control vector values  
A pattern recognition technology includes a set of control signal vector and covariance matrix for respective states of a reference pattern of an objective word for recognition, which reference...
5913192 Speaker identification with user-selected password phrases  
A speaker identification system includes a speaker-independent phrase recognizer. The speaker-independent phrase recognizer scores a password utterance against all the sets of phonetic...
5913193 Method and system of runtime acoustic unit selection for speech synthesis  
The present invention pertains to a concatenative speech synthesis system and method which produces a more natural sounding speech. The system provides for multiple instances of each acoustic unit...
5907826 Speaker-independent speech recognition using vowel/consonant segmentation based on pitch intensity values  
A speech recognition apparatus includes a feature extraction section, and a recognition section. The feature extraction section extracts the feature vectors of input speech. The feature extraction...
5907825 Location of pattern in signal  
A method for determining the location of a pattern, when input in isolation, within a representative input signal is provided. The method aligns the input signal with a signal representative of a...
5903865 Method of preparing speech model and speech recognition apparatus using this method  
A speech model preparing method capable of easily preparing a new Hidden Markov Model (HMM) of an input speech with a very few number of utterances like one or two times, and a speech recognition...
5899973 Method and apparatus for adapting the language model's size in a speech recognition system  
In this speech recognition system, the size of the language model is reduced by discarding those n-grams that the acoustic part of the system can recognize most accurately without support from a...
5895448 Methods and apparatus for generating and using speaker independent garbage models for speaker dependent speech recognition purpose  
Methods and apparatus for generating and using both speaker dependent and speaker independent garbage models in speaker dependent speech recognition applications are described. The present...
5893059 Speech recoginition methods and apparatus  
Methods and apparatus for transitioning from one speech recognition system to another and for reusing existing speech recognition data are described. In particular, various methods of converting...
5890111 Enhancement of esophageal speech by injection noise rejection  
Injection noise and silence are detected in an input speech signal and an external amplifier is switched on or off based on the detected injection noise or silence. The input speech signal is...
5890114 Method and apparatus for training Hidden Markov Model  
HMM training method comprising a first parameter predicting step, a centroid state set calculating step, a reconstructing step, a second parameter predicting step and a control step. In the first...
5884261 Method and apparatus for tone-sensitive acoustic modeling  
Tone-sensitive acoustic models are generated by first generating acoustic vectors which represent the input data. The input data is separated into multiple frames and an acoustic vector is...
5884259 Method and apparatus for a time-synchronous tree-based search strategy  
A method and apparatus for using a tree structure to constrain a time-synchronous, fast search for candidate words in an acoustic stream is described. A minimum stay of three frames in each graph...
5878390 Speech recognition apparatus equipped with means for removing erroneous candidate of speech recognition  
A speech recognition apparatus which includes a speech recognition section for performing a speech recognition process on an uttered speech with reference to a predetermined statistical language...
5870706 Method and apparatus for an improved language recognition system  
Methods and apparatus for a language model and language recognition systems are disclosed. The method utilizes a plurality of probabilistic finite state machines having the ability to recognize a...
5864810 Method and apparatus for speech recognition adapted to an individual speaker  
A method and apparatus for automatic recognition of speech adapts to a particular speaker by using adaptation data to develop a transformation through which speaker independent models are...
5864806 Decision-directed frame-synchronous adaptive equalization filtering of a speech signal by implementing a hidden markov model  
For equalizing a speech signal constituted by an observed sequence of successive input sound frames, which speech signal is liable to be affected by disturbances, the speech signal is modelled by...
5860062 Speech recognition apparatus and speech recognition method  
A speech recognition apparatus and method learns in advance a plurality of kinds of noises that can occur in the environment of use to determine a plurality of noise HMMs, synthesizes these noise...
5857169 Method and system for pattern recognition based on tree organized probability densities  
A time-sequential input pattern (20), which is derived from a continual physical quantity, such as speech is recognized. The system includes input means (30), which accesses the physical quantity...
5842165 Methods and apparatus for generating and using garbage models for speaker dependent speech recognition purposes  
Methods and apparatus for the generation of speaker dependent garbage models from the very same data used to generate speaker dependent speech recognition models, e.g., word models, are described....
5839105 Speaker-independent model generation apparatus and speech recognition apparatus each equipped with means for splitting state having maximum increase in likelihood  
There is provided a speaker-independent model generation apparatus and a speech recognition apparatus which require a processing unit to have less memory capacity and which allow its computation...
5835890 Method for speaker adaptation of speech models recognition scheme using the method and recording medium having the speech recognition method recorded thereon  
In a speaker adaptation method for speech models, input speech is transformed to a feature parameter sequence like a cepstral sequence, and N model sequences of maximum likelihood for the feature...
5835893 Class-based word clustering for speech recognition using a three-level balanced hierarchical similarity  
In a word clustering apparatus for clustering words, a plurality of words is clustered to obtain a total tree diagram of a word dictionary representing a word clustering result, where the total...
5832430 Devices and methods for speech recognition of vocabulary words with simultaneous detection and verification  
Devices and methods for speech recognition enable simultaneous word hypothesis detection and verification in a one-pass procedure that provides for different segmentations of the speech input. A...
5825978 Method and apparatus for speech recognition using optimized partial mixture tying of HMM state functions  
In accordance with the invention, a speech recognizer is provided which uses a computationally-feasible method for constructing a set of Hidden Markov Models (HMMs) for speech recognition that...
5819223 Speech adaptation device suitable for speech recognition device and word spotting device  
A speech adaptation device comprises a vocabulary independent reference pattern memory for memorizing a plurality of vocabulary independent reference patterns having one or more categories. Each...
5819222 Task-constrained connected speech recognition of propagation of tokens only if valid propagation path is present  
A speech recognition system recognizes connected speech using a plurality of vocabulary nodes, at least one of which has an associated signature. In use, partial recognition paths are examined at...
5812974 Speech recognition using middle-to-middle context hidden markov models  
This is a speech recognition method for modeling adjacent word context, comprising: dividing a first word or period of silence into two portions; dividing a second word or period of silence,...
5812975 State transition model design method and voice recognition method and apparatus using same  
A method of designing a state transition model capable of high speed voice recognition and a voice recognition method and apparatus using the state transition model is provided. The methods...
5806034 Speaker independent speech recognition method utilizing multiple training iterations  
A method for recognizing spoken utterances of a speaker is disclosed, the method comprising the steps of providing a database of labeled speech data; providing a prototype of a Hidden Markov Model...
5805772 Systems, methods and articles of manufacture for performing high resolution N-best string hypothesization  
Disclosed are systems, methods and articles of manufacture for performing high resolution N-best string hypothesization during speech recognition. A received input signal, representing a speech...
5805771 Automatic language identification method and system  
This invention consists of three enhancements to HMM-based automatic language identification systems. The three enhancements are: (i) language-discriminant acoustic model training and recognition,...
5799278 Speech recognition system and method using a hidden markov model adapted to recognize a number of words and trained to recognize a greater number of phonetically dissimilar words.  
A speech recognition system for discrete words uses a single Hidden Markov Model (HMM), which is nominally adapted to recognise N different isolated words, but which is trained to recognise M...
5799277 Acoustic model generating method for speech recognition  
The acoustic model generating method for speech recognition enables a high representation effect on the basis of the minimum possible model parameters. In an initial model having a smaller number...
5797123 Method of key-phase detection and verification for flexible speech understanding  
A key-phrase detection and verification method that can be advantageously used to realize understanding of flexible (i.e., unconstrained) speech. A "multiple pass" procedure is applied to a spoken...
5794198 Pattern recognition method  
One-dimensional normal distributions in respective dimensions of a continuous multi-dimensional normal distribution of each state of HMMs representing speech units mean and variance values are...
5787396 Speech recognition method  
A speech recognition method uses continuous mixture Hidden Markov Models (HMM) for probability processing including a first type of HMM having a small number of mixtures and a second type of HMM...
5778342 Pattern recognition system and method  
A pattern recognition system and method is disclosed. The method includes the steps of a) providing a noisy test feature set of the input signal, a plurality of reference feature sets of reference...
5778341 Method of speech recognition using decoded state sequences having constrained state likelihoods  
The invention is a speech recognition system and method for transmitting information including the receipt and decoding of speech information such as that modeled by hidden Markov models (HMMs)....