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5615296 Continuous speech recognition and voice response system and method to enable conversational dialogues with microprocessors  
A continuous speech recognition and voice response system provides a natural sounding and effective interactive, speech-driven dialogue from a data processing system. A concatenation of words into...
5598505 Cepstral correction vector quantizer for speech recognition  
A method for correcting cepstral vectors representative of speech generated in a test environment by use of a vector quantization (VQ) system with a codebook of vectors that was generated using...
5598504 Speech coding system to reduce distortion through signal overlap  
An adaptive codebook having excitation signal predetermined in the past, an excitation codebook for vector quantizing an excitation signal of the input speech signal and a gain codebook for vector...
5594833 Rapid sound data compression in code book creation  
The invention aims to provide a sound data compressing method for applying a three-or-more or n-dimensional correlation map in which representative sound values for sorting and making...
5590242 Signal bias removal for robust telephone speech recognition  
A signal bias removal (SBR) method based on the maximum likelihood estimation of the bias for minimizing undesirable effects in speech recognition systems is described. The technique is readily...
5581652 Reconstruction of wideband speech from narrowband speech using codebooks  
A wideband speech signal (8 kHz, for example) of high quantity is reconstructed from a narrowband speech signal (300 Hz to 3.4 kHz). The input narrowband speech signal is LPC-analyzed to obtain...
5579433 Digital coding of speech signals using analysis filtering and synthesis filtering  
A digital speech encoder is constructed to include a short term analyzer for forming a set of prediction parameters a(i), corresponding to an input speech signal, and an encoder for producing an...
5546498 Method of and device for quantizing spectral parameters in digital speech coders  
A method of and a device for speech signal digital coding are described, where spectral parameters are quantized at each frame in order to exploit the actual correlation inside a frame or between...
5544277 Speech coding apparatus and method for generating acoustic feature vector component values by combining values of the same features for multiple time intervals  
A speech coding apparatus and method measures the values of at least first and second different features of an utterance during each of a series of successive time intervals. For each time...
5528725 Method and apparatus for recognizing speech by using wavelet transform and transient response therefrom  
The present invention implements a method of automatic speech recognition in a personal computer environment and in real time. The invention uses a wavelet transformer to decompose digitized input...
5524170 Vector-quantizing device having a capability of adaptive updating of code book  
A vector-quantizing device comprises a first code book for storing a plurality of code vectors at respective addresses; a first addressing unit for selecting a code vector stored in the first...
5522011 Speech coding apparatus and method using classification rules  
A speech coding apparatus and method uses classification rules to code an utterance while consuming fewer computing resources. The value of at least one feature of an utterance is measured during...
5522009 Quantization process for a predictor filter for vocoder of very low bit rate  
A quantization process proposes a low data rate for predictor filters of a vocoder with a speech signal broken down into packets having a predetermined number L of frames of constant duration and...
5513297 Selective application of speech coding techniques to input signal segments  
A speech coding method and apparatus which selectively applies speech coding techniques to time segments of speech information signals, such as, e.g., pitch cycle waveforms is disclosed. A speech...
5502441 Analog switched-capacitor vector quantizer  
A switched-capacitor implementation of an analog vector quantizer (AVQ) determines which of various codevectors Vcb most closely matches a vector input signal Vinput of input signal samples....
5488704 Speech codec  
A speech codec includes a drive sound source generating circuit in which, in a case of a voiced sound speech, a pulse pattern signal corresponding to a pitch-scale, drive sound source signals...
5487129 Speech pattern matching in non-white noise  
A system for matching an input signal, comprising non-white noise and a patterned signal corrupted by said non-white noise, to a plurality of reference signals, the system including an estimator...
5487128 Speech parameter coding method and appparatus  
A speech parameter coding method and apparatus which can quantize a spectrum parameter of a speech signal with a smaller number of bits smaller than ever. A dividing section divides a...
5473727 Voice encoding method and voice decoding method  
A compressed digital speech signal is encoded to provide a transmission error-resistant transmission signal. The compressed speech signal is derived from a digital speech signal by performing a...
5396625 System for binary tree searched vector quantization data compression processing each tree node containing one vector and one scalar to compare with an input vector  
Data compression processing is carried out using binary Tree-Searched Vector Quantization in which the direction of branching at each node of the tree is decided by comparison of an input vector...
5396576 Speech coding and decoding methods using adaptive and random code books  
An excitation vector of the previous frame stored in an adaptive codebook is cut out with a selected pitch period. The excitation vector thus cut out is repeated until one frame is formed, by...
5388181 Digital audio compression system  
The digitally sampled data is split into a plurality of subbands each covering a different frequency range. The subbands are each individually expanded to normalize the energy in each band and the...
5377301 Technique for modifying reference vector quantized speech feature signals  
A signal processing arrangement uses a codebook of first vector quantized speech feature signals formed responsive to a large collection of speech feature signals. The codebook is altered by...
5341457 Perceptual coding of audio signals  
A technique for the masking of quantizing noise in the coding of audio signals is adapted to include geometric interpolation between the thresholds for a tone masking noise and for noise masking a...
5327520 Method of use of voice message coder/decoder  
A code excited linear predictive coder and decoder well suited to speech recording, transmission and reproduction, especially in voice messaging systems, provides backward adaptive gain control of...
5323486 Speech coding system having codebook storing differential vectors between each two adjoining code vectors  
A speech coding system is provided where input speech is coded by finding via an evaluation computation a code vector giving a minimum error between reproduced signals obtained by linear...
5307441 Wear-toll quality 4.8 kbps speech codec  
A speech codec operating at low data rates uses an iterative method to jointly optimize pitch and gain parameter sets. A 26-bit spectrum filter coding scheme may be used, involving successive...
5274741 Speech coding apparatus for separately processing divided signal vectors  
A speech coding apparatus includes multipliers and prediction filters which successively process a plurality of signal vectors obtained from an index 2M and dimension N code book to obtain a...
5271089 Speech parameter encoding method capable of transmitting a spectrum parameter at a reduced number of bits  
In a speech parameter encoding method of encoding an input speech signal into a sequence of encoded signals, vector quantization is carried out through a plurality of vector quantizers which are...
5268991 Apparatus for encoding voice spectrum parameters using restricted time-direction deformation  
An apparatus for encoding voice spectrum envelop parameters forms a phoneme matrix by combining a certain number of phoneme vectors, and effects matrix quantization by using this phoneme matrix as...
5265190 CELP vocoder with efficient adaptive codebook search  
A new method for Code Excited Linear Predictive (CELP) coding of speech reduces the computational complexity by removing a convolution operation from a recursive loop used to poll the adaptive...
5202926 Phoneme discrimination method  
To improve the accuracy of phoneme discrimination, a first phoneme discrimination method composes analyzing, not only static information on a voice but also dynamic information on the voice, power...
5195137 Method of and apparatus for generating auxiliary information for expediting sparse codebook search  
In many applications involving the coding and processing of speech signals the relevant applicable codebook is one which may be termed a sparse codebook. That is, the majority of elements in the...
5193140 Excitation pulse positioning method in a linear predictive speech coder  
A method for positioning excitation pulses for a linear predictive coder (LPC) operating according to the multi-pulse principle, i.e. a number of such pulses are positioned at specific time points...
5182773 Speaker-independent label coding apparatus  
The present invention is related to speech recognition and particularly to a new type of vector quantizer and a new vector quantization technique in which the error rate of associating a sound...
5151968 Vector quantization encoder and vector quantization decoder  
An apparatus for compressing and decompressing speech signals. The encoder or decoder comprises a plurality of codebooks each controlling a plurality of indexed code vectors for a different...
5136663 Vector quantization image processing apparatus  
A vector quantization image processing apparatus includes a minimum value separation circuit, a normalization circuit, and a first codebook. By separating the minimum value of the inputted vector...
5125030 Speech signal coding/decoding system based on the type of speech signal  
An input speech signal is encoded by an adaptive quantizer which quantizes the predicted residual signal between the digital input speech signal, and prediction signals provided by predictors and...
5086471 Gain-shape vector quantization apparatus  
A gain-shape vector quantization apparatus for compressing the data of voice signal. A code book portion is constituted by a plurality of shape vectors which produce a plurality of selected shape...
5077798 Method and system for voice coding based on vector quantization  
A system for voice coding based on vector quantization has an apparatus in which a distribution area of parameters representative of a voice is divided into a plurality of domains so that one...
5067152 Method and apparatus for vector quantization  
A method of and apparatus for vector quantizaiton operates on binary signal vectors. Each signal vector contains a plurality of sample elements of a signal to be compressed. Each of the signal...
5046099 Adaptation of acoustic prototype vectors in a speech recognition system  
In a speech recognition system, the prior parameters of acoustic prototype vectors are adapted to a new speaker to obtain posterior parameters by having the speaker utter a set of adaptation...
5012518 Low-bit-rate speech coder using LPC data reduction processing  
A speech coder employs vector quantization of LPC parameters, interpolation, and trellis coding for improved speech coding at low bit rates (400 bps). The speech coder has an LPC analysis module...
5010574 Vector quantizer search arrangement  
In an arrangement for coding multi-element signals such as used in speech or image processing, a plurality of N element reference signals representable in a prescribed vector space are stored. An...
5008941 Method and apparatus for automatically updating estimates of undesirable components of the speech signal in a speech recognition system  
A speech recognition method and apparatus take into account a system transfer function between the speaker and the recognition apparatus. The method and apparatus update a signal representing the...
5007092 Method and apparatus for dynamically adapting a vector-quantizing coder codebook  
A signal vector quantizing coder (CELP) is provided with an adaptive codebook originally loaded with preselected codewords. The codebook is split into a fixed contents portion and a fixed length...
4985923 High efficiency voice coding system  
A voice coding system for separating and coding voice information into spectrum envelope information and voice source information, with the intention of compressing the amount of information for...
4979215 Method of digitally evaluating the frequency and the phase of signals, and a device for implementing such a method  
A method of digitally evaluating the frequency and the phase of signals in the form of digitized samples, the method being wherein it comprises in succession:a stage during which numbers...
4979188 Spectrally efficient method for communicating an information signal  
According to the invention, an information signal, such as a information signal, is sampled, quantized and processed digitally through an information encoder. Digitally processed samples produced...
4972483 Speech processing system using adaptive vector quantization  
A speech processing system having an encoder comprising apparatus for receiving successive samples of PCM (pulse code modulated) encoded speech signals and apparatus, for applying sequential...