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5812968 Vocoder apparatus using the link margin  
An apparatus for improving the link margin of a communication link includes a variable rate vocoder which decreases the output bit stream rate it produces so as to reduce the amount of information...
5806024 Coding of a speech or music signal with quantization of harmonics components specifically and then residue components  
Harmonics coefficients are estimated in primary coefficients of an orthogonal transform of a speech or a music input signal by using a pitch frequency extracted from the input signal and are...
5799131 Speech coding and decoding system  
A speech coding and decoding system, where the system is operated under a known code-excited linear prediction (CELP) coding method. The CELP coding is achieved by selecting an optimum pitch...
5797118 Learning vector quantization and a temporary memory such that the codebook contents are renewed when a first speaker returns  
An encoding/decoding system employing vector quantization realizes a high quality encoding and decoding with decreased quantizing errors, employing a small sized codebook which faithfully...
5794183 Method of preparing data, in particular encoded voice signal parameters  
Method of preparing data, in particular voice signal parameters for transmission at a low bit rate, identical signal parameters are combined interval by interval in quantized form; forfurther bit...
5794182 Linear predictive speech encoding systems with efficient combination pitch coefficients computation  
Method and system aspects for linear predictive speech encoding are disclosed. These aspects comprise the definition of an error function, the computation of an optimal vector of continuous pitch...
5787390 Method for linear predictive analysis of an audiofrequency signal, and method for coding and decoding an audiofrequency signal including application thereof  
The linear predictive analysis method is used in order to determine the spectral parameters representing the spectral envelope of the audiofrequency signal. This method comprises q successive...
5778336 Speech coding and joint data/channel bias estimation using finite state vector quantizer derived from sequential constraints  
A joint data (features) and channel (bias) estimation framework for robust processing of speech received over a channel is described. A trellis encoded vector quantizer is used as a pre-processor...
5774839 Delayed decision switched prediction multi-stage LSF vector quantization  
An apparatus and method of quantizing a sequence of input data vectors using delayed decision switched prediction and vector quantization. The method has the following steps of operation: (a)...
5774838 Speech coding system utilizing vector quantization capable of minimizing quality degradation caused by transmission code error  
In a vector quantization apparatus for expressing a target vector by using a code vector designated by an index, an error evaluating section performs error evaluation for a code vector without...
5765128 Apparatus for synchronizing a voice coder and a voice decoder of a vector-coding type  
An apparatus synchronizes a voice coder and a voice decoder which are of the vector-coding type in order to prevent a false synchronization even when a signal having the same period as a string of...
5761632 Vector quantinizer with distance measure calculated by using correlations  
A vector quantizer for a speech coder for coding speech signals at low bit rates. The vector quantizer includes an auto-correlation calculation circuit for calculating an impulse response of a...
5751900 Speech pitch lag coding apparatus and method  
A pitch lag is extracted for each of a predetermined number of sub-frames. A predicted pitch lag for a pertinent sub-frame in the predetermined number of sub-frames is calculated on the basis of...
5748839 Quantization of input vectors and without rearrangement of vector elements of a candidate vector  
For quantizing input vectors into output codes with reference to quantization vectors with reduction of a memory capacity, a vector quantizer device comprises a rearranging unit (21, 23) between a...
5749065 Speech encoding method, speech decoding method and speech encoding/decoding method  
A speech encoding/decoding method calculates a short-term prediction error of an input speech signal that is divided on a time axis into blocks, represents the short-term prediction residue by a...
5745873 Speech recognition using final decision based on tentative decisions  
A method for recognizing speech elements (e.g., phones) in utterances includes the following steps. Based on acoustic frequency, at least two different acoustic representatives are isolated for...
5745872 Method and system for compensating speech signals using vector quantization codebook adaptation  
The present invention is a speech processing system and method which includes a codebook generator (26) for generating a reference vector quantization codebook which describes a reference...
5737484 Multistage low bit-rate CELP speech coder with switching code books depending on degree of pitch periodicity  
A voice coder system is capable of coding speech at low bit rates with high speech quality. Speech signals are divided into frames and further divided into subframes. A spectral parameter...
5734679 Voice signal transmission system using spectral parameter and voice parameter encoding apparatus and decoding apparatus used for the voice signal transmission system  
The invention provides a voice signal transmission system which reduces the amount of increase in calculation while suppressing possible deterioration of the performance by an expansion in the...
5734791 Rapid tree-based method for vector quantization  
The branching decision for each node in a vector quantization (VQ) binary tree is made by a simple comparison of a pre-selected element of the candidate vector with a stored threshold resulting in...
5732390 Speech signal transmitting and receiving apparatus with noise sensitive volume control  
A speech signal transmitting receiving apparatus, such as a portable telephone set, includes a speech signal transmitting encoding circuit, a noise domain detection unit, a noise level detection...
5732389 Voiced/unvoiced classification of speech for excitation codebook selection in celp speech decoding during frame erasures  
A CELP speech decoder includes a first portion comprising an adaptive codebook and a second portion comprising a fixed codebook. The CS-ACELP decoder generates a speech excitation signal...
5732392 Method for speech detection in a high-noise environment  
In method for detecting a speech period in a high-noise environment, the variation in the spectrum of an input signal per unit time is calculated over an analysis frame period, and when the...
5729654 Vector encoding method, in particular for voice signals  
The vector encoding method, particularly for voice signals, includes storing autocorrelation coefficients in one codebook and performing a logic operation on the autocorrelation coefficients with...
5727122 Code excitation linear predictive (CELP) encoder and decoder and code excitation linear predictive coding method  
There is provided a code excitation linear predictive (CELP) coding or decoding apparatus in which a code vector, which is transmitted by a codebook such as a stochastic codebook, is converted...
5721806 Method for allocating optimum amount of bits to MPEG audio data at high speed  
A method for allocating an optimum amount of bits to MPEG audio data at high speed. A signal-to-mask ratio obtained through a psychoacoustic model is divided by 6 and the resultant integer...
5721543 System and method for modeling discrete data sequences  
An encoder and decoder system for compressing discrete data sequences is disclosed. The encoder includes a self-affine map generator and a backward adaptive map generator which model source...
5717824 Adaptive speech coder having code excited linear predictor with multiple codebook searches  
Methods and apparatus determining codevectors in response to a speech signal include a first codebook member which stochastically determines the characteristics of a bi-pulse codevector...
5706391 Method and an apparatus for processing information  
With respect to pattern recognition or the like, this invention is aimed at reducing the arithmetic processing steps of determining analogy between an inputted pattern and reference patterns in...
5704006 Method for processing speech signal using sub-converting functions and a weighting function to produce synthesized speech  
A parameter converting method and a speech synthesizing method for synthesizing speech with a voice quality similar to that of an input voice includes a parameter converting function constituted...
5699483 Code excited linear prediction coder with a short-length codebook for modeling speech having local peak  
A predicted residual signal is calculated from a current input speech signal and a past input speech signal, and a cross-correlation between the predicted residual signal and the past input speech...
5699485 Pitch delay modification during frame erasures  
In a speech decoder which experiences frame erasure, the pitch delay associated with the first of consecutive erased frames is incremented. The incremented value is used as the pitch delay for the...
5692101 Speech coding method and apparatus using mean squared error modifier for selected speech coder parameters using VSELP techniques  
An improved speech coder provides a more natural sounding replication of speech by modifying the mean-squared error criterion for the selected speech coder parameters. Specifically, the...
5692100 Vector quantizer  
A codebook for vector quantization is speaker-adapted or a speaker is normalized so that it complies with the codebook using a small number of samples for learning. A deviation vector is set for...
5687284 Excitation signal encoding method and device capable of encoding with high quality  
In an excitation signal encoding method comprising the steps of, dividing a speech signal into a plurality of frames, dividing each of the plurality of frames into a plurality of subframes each of...
5677986 Vector quantizing apparatus  
A vector quantizing apparatus includes a first search section for obtaining an approximate vector X1 which is approximated to a desired vector R, a residual vector calculator for calculating a...
5675701 Speech coding parameter smoothing method  
A decoding method and apparatus for speech coding systems which takes into account the fact that the human auditory system is sensitive to changes in signal characteristics. For example, a...
5668925 Low data rate speech encoder with mixed excitation  
A speech signal has its characteristics extracted and encoded (16), transmitted over a limited-data-rate path (18) and is decoded (20) and synthesized (22) at the receiving end. The...
5666466 Method and apparatus for speaker recognition using selected spectral information  
A method and apparatus are disclosed for robust, text-independent (and text-dependent) speaker recognition in which identification of a speaker is based on selected spectral information from the...
5666465 Speech parameter encoder  
A speech parameter encoder capable of encoding spectrum parameters at a bit rate of 1 kb/s or less with comparatively small amount of operations and memory capacity. A spectrum parameter...
5664055 CS-ACELP speech compression system with adaptive pitch prediction filter gain based on a measure of periodicity  
A speech coding system employing an adaptive codebook model of periodicity is augmented with a pitch-predictive filter (PPF). This PPF has a delay equal to the integer component of the...
5664053 Predictive split-matrix quantization of spectral parameters for efficient coding of speech  
The present invention concerns efficient quantization of more than one LPC spectral models per frame in order to enhance the accuracy of the time-varying spectrum representation without...
5657419 Method for processing speech signal in speech processing system  
A method for processing an input speech signal to be applied to a CELP vocoder has the steps of obtaining preliminary pitch search intervals by a preprocessing autocorrelation expression from a...
5651026 Robust vector quantization of line spectral frequencies  
A line spectral frequency (LSF) vector quantizer, having particular application in digital cellular networks (DCN), is provided for code excited linear predictive (CELP) speech encoders. The LSF...
5649056 Speech recognition system and method which permits a speaker's utterance to be recognized using a hidden markov model with subsequent calculation reduction  
A sound analyzer sound analyzes an input speech signal to obtain feature vectors. A matrix quantizer performs a matrix quantization process between the feature vectors obtained by the sound...
5649051 Constant data rate speech encoder for limited bandwidth path  
A speech signal has its characteristics extracted and encoded (16), transmitted over a limited-data-rate path (18) and is decoded (20) and synthesized (22) at the receiving end. The...
5636322 Vector quantizer  
A vector quantizer is disclosed which performs low bit rate coding of time sequential signals such as speech signals and image signals. A basis vector set is provided consisting of basis vectors...
5633984 Method and apparatus for speech processing  
An apparatus and method for processing vocal information includes an extractor for extracting a plurality of spectrum information from parameters for vocal information, a vector quantizer for...
5627939 Speech recognition system and method employing data compression  
A data compression system greatly compresses the stored data used by a speech recognition system employing hidden Markov models (HMM). The speech recognition system vector quantizes the acoustic...
5625744 Speech parameter encoding device which includes a dividing circuit for dividing a frame signal of an input speech signal into subframe signals and for outputting a low rate output code signal  
On encoding with a smallest possible number of bits LPC parameters produced by an LPC analyzer from at least one of subframe signals of each frame signal of an input speech signal, a divider...