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7979273 Method and apparatus for the digitization of and for the data compression of analog signals  
The invention is based on the idea of providing a method for high-resolution, waveform-preserving digitization of analog signals, wherein conventional scalar logarithmic quantization is...
7979272 System and methods for concealing errors in data transmission  
The present invention provides a frame erasure concealment device and method that is based on reestimating gain parameters for a code excited linear prediction (CELP) coder. During operation, when...
7966175 Fast lattice vector quantization  
Methods, devices, and systems for coding and decoding audio are disclosed. Digital samples of an audio signal are transformed from the time domain to the frequency domain. The resulting transform...
7962332 Apparatus and method of encoding and decoding audio signal  
In one embodiment, the method includes receiving an audio data frame having at least first and second channels. The first and second channels are independently subdivided into blocks if the first...
7953604 Shape and scale parameters for extended-band frequency coding  
An audio encoder performs frequency extension coding that comprises determining one or more shape parameters using a displacement vector that corresponds to a displacement of an even number (e.g.,...
7949521 Fixed codebook searching apparatus and fixed codebook searching method  
A fixed codebook searching apparatus which slightly suppresses an increase in the operation amount, even if the filter applied to the excitation pulse has the characteristic that it cannot be...
7945441 Quantized feature index trajectory  
Indexing methods are described that may be used by databases, search engines, query and retrieval systems, context sensitive data mining, context mapping, language identification, image...
7941314 Fixed codebook search method and searcher  
A fixed codebook search method includes: initializing a counter; searching for pulses and calculating the value of a cost function Qk; initializing the counter if the Qk value increases;...
7937271 Audio decoding using variable-length codebook application ranges  
Provided are, among other things, systems, methods and techniques for decoding an audio signal from a frame-based bit stream. Each frame includes processing information pertaining to the frame and...
7933770 Method and device for coding audio data based on vector quantisation  
A wideband audio coding concept is presented that provides good audio quality at bit rates below 3 bits per sample with an algorithmic delay of less than 10 ms. The concept is based on the...
7930173 Signal processing method, signal processing apparatus and recording medium  
Provided is a signal processing method which can enhance the resolution of a spectrum round off by quantization and compensate energy of a spectrum truncated to zero by quantization so as to...
7925501 Speech coder using an orthogonal search and an orthogonal search method  
Speech is coded using an orthogonal search by calculating a search reference value. An adaptive codevector representing a pitch component is generated. A random codevector representing a random...
7908136 Fixed codebook search method and searcher  
A fixed codebook search method includes initializing a counter, searching for pulses and calculating the value of a cost function Qk, initializing the counter if the Qk value increases, increasing...
7904293 Sub-band voice codec with multi-stage codebooks and redundant coding  
Techniques and tools related to coding and decoding of audio information are described. For example, redundant coded information for decoding a current frame includes signal history information...
7899667 Waveform interpolation speech coding apparatus and method for reducing complexity thereof  
A waveform interpolation speech coding apparatus and method for reducing complexity thereof are disclosed. The waveform interpolation speech coding apparatus includes: a waveform interpolation...
7895034 Audio encoding system  
Provided are, among other things, systems, methods and techniques for encoding an audio signal, in which is obtained a sampled audio signal which has been divided into frames. The location of a...
7890323 Digital filtering method, digital filtering equipment, digital filtering program, and recording medium and recorded device which are readable on computer  
Included in the digital filtering equipment for extracting a feature quantity from a speech signal in order to execute a speech recognition based on an inputted speech signal are: a) an waveform...
7885809 Quantization of speech and audio coding parameters using partial information on atypical subsequences  
A method and apparatus is disclosed herein for a quantizing parameters using partial information on atypical subsequences. In one embodiment, the method comprises partially classifying a first...
7873512 Sound encoder and sound encoding method  
Even when a combination of the stegonography technique and prediction encoding is applied to sound encoding, a sound encoder does not cause deterioration in quality of decoded signals. In the...
7873514 Method for quantizing speech and audio through an efficient perceptually relevant search of multiple quantization patterns  
A method and apparatus is disclosed herein for quantizing data using a perceptually relevant search of multiple quantization patterns. In one embodiment, the method comprises performing a...
7856096 Erasure of DTMF signal transmitted as speech data  
A DTMF signal processing apparatus of the present invention comprises a data divider unit, a DTMF signal component analyzer unit, a weighting processing unit, a buffer, a DTMF signal erasure...
7853438 Comparison of data signals using characteristic electronic thumbprints extracted therefrom  
A characteristic thumbprint is extracted from a data signal, the thumbprint based on statistics relating to the data signal. The data signal can be compared indirectly by matching this thumbprint...
7848923 Method for reducing decoder complexity in waveform interpolation speech decoding by converting dimension of vector  
Provided is a method for converting a dimension of a vector. The vector dimension conversion method for vector quantization includes the steps of: extracting a specific parameter having a pitch...
7848924 Method, apparatus and computer program product for providing voice conversion using temporal dynamic features  
An apparatus for providing voice conversion using temporal dynamic features includes a feature extractor and a transformation element. The feature extractor may be configured to extract dynamic...
7840403 Entropy coding using escape codes to switch between plural code tables  
An audio encoder performs entropy encoding of audio data. For example, an audio encoder determines whether a first code table in a group of plural code tables contains a code representing a first...
7822601 Adaptive vector Huffman coding and decoding based on a sum of values of audio data symbols  
An audio encoder performs entropy encoding of audio data. For example, an audio encoder determines a Huffman code from a Huffman code table to use for encoding a vector of audio data symbols,...
7809558 Vector transformation apparatus and vector transformation method  
There is provided a vector conversion device for converting a reference vector used for quantization of an input vector so as to improve a signal quality including audio. In this vector conversion...
7805308 Hidden trajectory modeling with differential cepstra for speech recognition  
A novel system for speech recognition uses differential cepstra over time frames as acoustic features, together with the traditional static cepstral features, for hidden trajectory modeling, and...
7797158 System and method for improving robustness of speech recognition using vocal tract length normalization codebooks  
Disclosed are systems, methods, and computer readable media for performing speech recognition. The method embodiment comprises selecting a codebook from a plurality of codebooks with a minimal...
7792670 Method and apparatus for speech coding  
A method and apparatus for prediction in a speech-coding system is provided herein. The method of a 1st order long-term predictor (LTP) filter, using a sub-sample resolution delay, is extended to...
7783496 Encoding device and decoding device  
An encoding device (200) includes an MDCT unit (202) that transforms an input signal in a time domain into a frequency spectrum including a lower frequency spectrum, a BWE encoding unit (204) that...
7778827 Method and device for gain quantization in variable bit rate wideband speech coding  
The present invention relates to a gain quantization method and device for implementation in a technique for coding a sampled sound signal processed, during coding, by successive frames of L...
7769583 Quantizing feature vectors in decision-making applications  
A system, method and computer program product for classification of an analog electrical signal using statistical models of training data. A technique is described to quantize the analog...
7769581 Method of coding a signal using vector quantization  
The present invention relates to a method of coding a signal, in particular an audio or speech signal, wherein a codebook comprising k code vectors is provided for vector quantization of a signal...
7769584 Encoder, decoder, encoding method, and decoding method  
An encoder, decoder, encoding method, and decoding method enabling acquisition of high-quality decoded signal in scalable encoding of an original signal in first and second layers even if the...
7761290 Flexible frequency and time partitioning in perceptual transform coding of audio  
An audio encoder/decoder performs band partitioning for vector quantization encoding of spectral holes and missing high frequencies that result from quantization when encoding at low bit rates....
7752039 Method and device for low bit rate speech coding  
A method for coding speech or other generic signals includes dividing a speech signal into a plurality of frames, and dividing at least one of the plurality of frames into at least two subframe...
7747441 Method and apparatus for speech decoding based on a parameter of the adaptive code vector  
A high quality speech is reproduced with a small data amount in speech coding and decoding for performing compression coding and decoding of a speech signal to a digital signal. In speech coding...
7725310 Audio encoding  
Coding of an audio signal (x) represented by a respective set of sampled signal values (x(t)) for each of a plurality of sequential time segments is disclosed. The sampled signal values are...
7698132 Sub-sampled excitation waveform codebooks  
Methods and apparatus are presented for reducing the number of bits needed to represent an excitation waveform. An acoustic signal in an analysis frame is analyzed to determine whether it is a...
7693707 Voice/musical sound encoding device and voice/musical sound encoding method  
A voice and musical tone coding apparatus is provided that can perform high-quality coding by executing vector quantization taking the characteristics of human hearing into consideration. In this...
7680670 Dimensional vector and variable resolution quantization  
The invention relates to compression coding and/or decoding of digital signals, in particular by vector variable-rate quantisation defining a variable resolution. For this purpose an impulsion...
7668715 Methods for selecting an initial quantization step size in audio encoders and systems using the same  
A method of performing quantization in an audio encoder includes determining a number of bits available in a frame of encoded audio data. Determinations are also made for the maximum transform...
7664633 Audio coding via creation of sinusoidal tracks and phase determination  
Coding of an audio signal represented by a respective set of sampled signal values for each of a plurality of sequential segments is disclosed. The sampled signal values are analyzed (40) to...
7647222 Apparatus and methods for encoding digital audio data with a reduced bit rate  
A method and an apparatus for encoding digital audio data with reduced bit rates, the apparatus having a provider of psycho-acoustically quantized digital audio data with a bit rate being higher...
7630902 Apparatus and methods for digital audio coding using codebook application ranges  
A low bit rate digital audio coding system includes an encoder which assigns codebooks to groups of quantization indexes based on their local properties resulting in codebook application ranges...
7630886 Hochwald construction of unitary matrix codebooks via eigen coordinate transformations  
A method of deriving a codebook including deriving a first codeword Pl in Euclidean coordinates, transforming the first codeword into eigen-coordinates, applying a Hochwald construction to the...
7630890 Block-constrained TCQ method, and method and apparatus for quantizing LSF parameter employing the same in speech coding system  
A block-constrained Trellis coded quantization (TCQ) method and a method and apparatus for quantizing line spectral frequency (LSF) parameters employing the same in a speech coding system wherein...
7624022 Speech compression and decompression apparatuses and methods providing scalable bandwidth structure  
A speech compression apparatus including: a first band-transform unit transforming a wideband speech signal to a narrowband low-band speech signal; a narrowband speech compressor compressing the...
7617096 Robust quantization and inverse quantization using illegal space  
A quantizer for quantization of a vector comprises a codevector generator that generates a set of candidate codevectors and a memory for storing an illegal space definition representing illegal...