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6504877 Successively refinable Trellis-Based Scalar Vector quantizers  
Methods of designing successively refinable Trellis-Based Scalar-Vector quantizers (TB-SVQ) include a multi-stage process wherein a TB-SVQ is applied to a set of digital data to set up a codebook...
6499010 Perceptual audio coder bit allocation scheme providing improved perceptual quality consistency  
A method (and apparatus) for coding an audio signal, the method comprising the steps of partitioning the audio signal into a sequence of successive frames; calculating one or more noise thresholds...
6493664 Spectral magnitude modeling and quantization in a frequency domain interpolative speech codec system  
Encoding of prototype waveform components applicable to telecommunication systems provides improved voice quality enabling a dual-channel mode of operation which permits more users to communicate...
6470313 Speech coding  
A variable bit-rate speech coding method determines for each subframe a quantised vector d(i) comprising a variable number of pulses. An excitation vector c(i) for exciting LTP and LPC synthesis...
6463409 METHOD OF AND APPARATUS FOR DESIGNING CODE BOOK OF LINEAR PREDICTIVE PARAMETERS, METHOD OF AND APPARATUS FOR CODING LINEAR PREDICTIVE PARAMETERS, AND PROGRAM STORAGE DEVICE READABLE BY THE DESIGNING APPARATUS  
A code book is a set of code vectors to be selected when linear predictive parameters are vector-quantized as for an input audio which is divided into frames, each of which is further divided into...
6456964 Encoding of periodic speech using prototype waveforms  
A method and apparatus for coding a quasi-periodic speech signal. The speech signal is represented by a residual signal generated by filtering the speech signal with a Linear Predictive Coding...
6449591 Learning apparatus, learning method, recognition apparatus, recognition method, and recording medium  
With respect to each of codes corresponding to code vectors in a code book stored in a code book storage section, an expectation degree storage section stores an expectation degree at which...
6434522 Combined quantized and continuous feature vector HMM approach to speech recognition  
A device capable of achieving recognition at a high accuracy and with fewer calculations and which utilizes an HMM. The present device has a vector quantizing circuit generating a model by...
6430530 Apparatus for automatically processing both encoded and unencoded data  
An apparatus for automatically rendering both encoded and unencoded data files comprises a data processor and a decoder. The data processor receives a set of input data from a storage medium, such...
6424941 Adaptively compressing sound with multiple codebooks  
Compression of speech may be achieved through the adaptive generation of a compressed sound output. A first processing element may be used to characterize a first sound representation such that a...
6418405 Method and apparatus for dynamic segmentation of a low bit rate digital voice message  
A system controller (106) includes a speech encoder (107) that dynamically segments frames of a low bit rate digital voice message. Speech model parameters have been generated in a sequence of...
6418408 Frequency domain interpolative speech codec system  
Encoding of prototype waveform components applicable to GeoMobile and Telephony Earth Station (TES) providing improved voice quality enabling a dual-channel mode of operation which permits more...
6415254 Sound encoder and sound decoder  
An excitation vector generator comprises a pulse vector generating section having N channels (N≧1) for generating pulse vectors, a storing section for storing M (M≧1)kinds of dispersion patterns...
6415279 Method and access means for determining the storage address of a data value in a memory device  
A method and an access mechanism for determining the storage address of a predetermined data value (D1, D2, D3) in a memory device is disclosed. The data values are stored in an increasing order...
6393394 Method and apparatus for interleaving line spectral information quantization methods in a speech coder  
A method and apparatus for interleaving line spectral information quantization methods in a speech coder includes quantizing line spectral information with two vector quantization techniques, the...
6389388 Encoding a speech signal using code excited linear prediction using a plurality of codebooks  
A speech signal is encoded using code excited linear prediction for use in transmitting the speech signal to a receiver. The speech signal is sampled. A current sample of the speech signal is...
6389389 Speech recognition using unequally-weighted subvector error measures for determining a codebook vector index to represent plural speech parameters  
Quantization unit (108) comprises evaluator (120) and comparator (122) in signal processing for identifying an utterance in system (100). The evaluator (120) weights a first intermediate result of...
6385575 Constraint relieving vector quantization apparatus and vector quantization method having constraints in quantization vectors  
A constraint relieving section receives an input vector and transforms it with a predetermined transform function to generate a target vector obtained by subtracting a constraint vector...
6343267 Dimensionality reduction for speaker normalization and speaker and environment adaptation using eigenvoice techniques  
A set of speaker dependent models or adapted models is trained upon a comparatively large number of training speakers, one model per speaker, and model parameters are extracted in a predefined...
6321193 Distance and distortion estimation method and apparatus in channel optimized vector quantization  
A channel optimized vector quantization apparatus includes a device for weighting a sample vector x by a weighting matrix A and a device for weighting a set of code book vectors cr by a weighting...
6311154 Adaptive windows for analysis-by-synthesis CELP-type speech coding  
A speech coder and a method for speech coding wherein the speech signal is represented by an excitation signal applied to a synthesis filter. The speech is partitioned into frames and subframes. A...
6298322 Encoding and synthesis of tonal audio signals using dominant sinusoids and a vector-quantized residual tonal signal  
Tonal audio signals can be modeled as a sum of sinusoids with time-varying frequencies, amplitudes, and phases. An efficient encoder and synthesizer of tonal audio signals is disclosed. The...
6289307 Codebook preliminary selection device and method, and storage medium storing codebook preliminary selection program  
Prior to deriving precise evaluation values for evaluating errors between synthetic signal vectors and a target signal vector, simple evaluation values are derived. Based on the simple evaluation...
6269333 Codebook population using centroid pairs  
First and second codeword are selected from respective first and second codebooks having an equal number of codewords and wherein the first and second codewords represent unequal numbers of...
6256607 Method and apparatus for automatic recognition using features encoded with product-space vector quantization  
An automatic recognition system and method divides observation vectors into subvectors and determines a quantization index for the subvectors. Subvector indices can then be transmitted or...
6253173 Split-vector quantization for speech signal involving out-of-sequence regrouping of sub-vectors  
A method and apparatus for compressing and decompressing an audio signal. The apparatus comprises an input for receiving an audio signal derived from a spoken utterance, the audio signal being...
6249759 Communication apparatus using speech vector comparison and recognition  
A communication apparatus making use of speech vector coding scheme stores a plurality of predetermined code vectors and registered keyword data. A speech encoder codes an input speech keyword to...
6246979 Method for voice signal coding and/or decoding by means of a long term prediction and a multipulse excitation signal  
This invention relates to a method for voice signal coding and/or decoding. According to this method, a voice signal analysis for determining the prediction parameters is carried out from a...
6240382 Efficient codebook structure for code excited linear prediction coding  
A speech communication system using a code excited linear prediction speech decoder. The decoder using a first codebook containing a first digital value sequence selected from the set of binary...
6240385 Methods and apparatus for efficient quantization of gain parameters in GLPAS speech coders  
In methods and apparatus for encoding a gain parameter in a generalized linear predictive analysis-by-synthesis (GLPAS) coder, a subframe gain parameter is determined for each of a plurality of...
6236961 Speech signal coder  
The spectral or pitch parameters of a speech signal are quantized, and impulse responses thereof are predicted by using a filter. An orthogonal transform is made of the speech signal, or a signal...
6230124 Coding method and apparatus, and decoding method and apparatus  
An audio encoder 3 divides on a time axis an input audio signal into predetermined coding units and executes coding to each of the coding units so as to output a plurality of types of audio coded...
6212495 Coding method, coder, and decoder processing sample values repeatedly with different predicted values  
A differential pulse-code modulation coder obtains an improved signal-to-noise ratio, with only a small increase in bit rate, by repetitive coding. In one aspect, the coder divides the input...
6208957 Voice coding and decoding system  
A first CELP coding circuit receiving a signal obtained by down-sampling of an input signal by a down-sampling circuit, outputs a part of coded output to a second CELP coding circuit. The second...
6199040 System and method for communicating a perceptually encoded speech spectrum signal  
System efficiently communicates a perceptually encoded speech spectrum signal from a transmitter to a receiver. The transmitter includes a speech analyzer which accepts a speech signal input and...
6199037 Joint quantization of speech subframe voicing metrics and fundamental frequencies  
Speech is encoded into a frame of bits. A speech signal is digitized into a sequence of digital speech samples that are then divided into a sequence of subframes. A set of model parameters is...
6192334 Audio encoding apparatus and audio decoding apparatus for encoding in multiple stages a multi-pulse signal  
Auxiliary multi-pulse setting circuit 130 set candidates of pulse positions so that the pulse positions to which no pulse is located are selected in auxiliary multi-pulse searching circuit 131...
6175817 Method for vector quantizing speech signals  
Two codebooks each consisting of a filter memory are used for vector quantizing of a speech sample. Fixed excitation vectors and pitch parameters of a prediction filter are entered in the...
6161086 Low-complexity speech coding with backward and inverse filtered target matching and a tree structured mutitap adaptive codebook search  
A family of low-complexity, high quality CELP speech coders are described which use two new techniques: Backward and Inverse Filtered Target (BIFT) for fixed codebook excitation search; and...
6161089 Multi-subframe quantization of spectral parameters  
Speech is encoded into a frame of bits. A speech signal is digitized into a sequence of digital speech samples that are then divided into a sequence of subframes. A set of model parameters is...
6151414 Method for signal encoding and feature extraction  
A new encoder is provided which operates on a database of n-dimensional signal vectors where such signal vectors are restricted to being non-negative. In the establishment of a codebook for this...
6148283 Method and apparatus using multi-path multi-stage vector quantizer  
A multi-path, split, multi-stage vector quantizer (MPSMS-VQ) having multiple paths between stages which result in a robust and flexible quanitizer. By varying parameters, the MPSMS-VQ meets design...
6141637 Speech signal encoding and decoding system, speech encoding apparatus, speech decoding apparatus, speech encoding and decoding method, and storage medium storing a program for carrying out the method  
A speech encoding and decoding system comprises a speech coding apparatus and a speech decoding apparatus. The speech encoding apparatus orthogonally transforms an input speech signal represented...
6141640 Multistage positive product vector quantization for line spectral frequencies in low rate speech coding  
A digital transmitter/receiver communications system transmits audio voice signals over a channel with increased quality for a specified bit rate. The method of encoding takes advantage of...
6134520 Split vector quantization using unequal subvectors  
A 1200 b/s vocoder providing a high degree of speech intelligibility and natural voice quality includes a tenth-order linear prediction analyzer, a split vector quantizer for line spectral...
6131083 Method of encoding and decoding speech using modified logarithmic transformation with offset of line spectral frequency  
On the basis of an autocorrelation coefficient calculated by an autocorrelation coefficient computation section from an input speech signal, an LSF computation section computes LSF parameters F(k)...
6131084 Dual subframe quantization of spectral magnitudes  
Speech is encoded into a 90 millisecond frame of bits for transmission across a satellite communication channel. A speech signal is digitized into digital speech samples that are then divided into...
6122608 Method for switched-predictive quantization  
A new method for quantization of the LPC coefficients in a speech coder includes an improved form of switched predictive multi-stage vector quantization. The switch predictive quantization...
6104991 Speech encoding and decoding system which modifies encoding and decoding characteristics based on an audio signal  
The present invention relates to a speech encoder/decoder system employing digital transmission in which the encoding and decoding operations are complimentary, and these operations make use of...
6098037 Formant weighted vector quantization of LPC excitation harmonic spectral amplitudes  
A method of quantizing harmonic amplitudes (FIG. 3), used in a speech encoder (10). The method compares variable dimension input vectors to fixed dimension codebook vectors, by first sampling each...