Matches 151 - 200 out of 464 < 1 2 3 4 5 6 7 8 9 10 >
Match Document Document Title
6523002 Speech coding having continuous long term preprocessing without any delay  
A zero delay continuous long term (LT) pre-processing method operable in a speech codec that introduces no delay. The present invention provides an elegant solution to perform long term (LT)...
6518891 Encoding apparatus and method, recording medium, and decoding apparatus and method  
The first codec-based dummy string generator 132 generates a first code-cbased dummy string in a first code string conforming to a first format based on the first coding method. The second codec...
6507820 Speech band sampling rate expansion  
The present-invention relates to a method for the band expansion of speech for telephones, in particular for mobile telephones, by increasing the effective sampling rate of the speech signal by the...
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...
6496798 Method and apparatus for encoding and decoding frames of voice model parameters into a low bit rate digital voice message  
A system controller ( 106 ) includes a speech encoder ( 107 ) that encodes a low bit rate digital voice message. The speech encoder sets values of words of a header of the encoded message. The...
6493665 Speech classification and parameter weighting used in codebook search  
A multi-rate speech coded supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding...
6493666 System and method for processing data from and for multiple channels  
This invention takes advantage of the potential for a group of data channels, especially if they are carrying a related form of information such as human telephone conversations, to be compressed...
6487528 Method and apparatus for encoding or decoding audio or video frame data  
For broadcasting purposes a multi-channel audio encoder board has been designed. A requirement for such encoders is that they are able to operate with different encoding parameters. It may happen...
6487527 Enhanced quantization method for spectral frequency coding  
A linear predictive speech encoding method combines vector quantization with the search for roots of LSP polynomials. At Under this method, a code book searchable using line spectral pair (LSP)...
6484139 Voice frequency-band encoder having separate quantizing units for voice and non-voice encoding  
A voice encoding device according to the present invention includes an encoder having a first quantizing block suitable for voice encoding and a second quantizing block suitable for non-voice...
6480550 Method of compressing an analogue signal  
Described is a method of compressing an analogue signal, e.g. a voice signal, the signal function being continuously sampled, quantized and encoded into data words, the difference between each two...
6476735 Method of encoding bits using a plurality of frequencies  
A digital encoding system for encoding a series of input bits into a plurality of frequencies, includes an encoder for generating a sampled representation of the frequencies corresponding to an...
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...
6456968 Subband encoding and decoding system  
A band splitting section a 01 splits an encoder input signal s 00, entered into a subband encoding apparatus, into k band components. The band splitting section a 01 outputs a subband signal s...
6446037 Scalable coding method for high quality audio  
Scalable coding of audio into a core layer in response to a desired noise spectrum established according to psychoacoustic principles supports coding augmentation data into augmentation layers in...
6438525 Scalable audio coding/decoding method and apparatus  
A scalable audio coding/decoding method and apparatus are provided. The coding method includes the steps of (a) signal-processing input audio signals and quantizing the same for each predetermined...
6434162 PCM data outputting method and PCM data output device enabling output of PCM group information and PCM data correctly correlated with each other  
A PCM data outputting method of receiving input of a data stream of PCM packets to output PCM data which includes the steps of receiving input of a PCM data stream made up of a plurality of packets...
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...
6424936 Block size determination and adaptation method for audio transform coding  
A method for identifying and categorizing an audio signal into subclasses to determine a subframe block size of a transform coder. A number of block sizes available for the transform coder is...
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...
6424939 Method for coding an audio signal  
A method for coding or decoding an audio signal combines the advantages of TNS processing and noise substitution. A time-discrete audio signal is initially transformed to the frequency domain in...
6421641 Methods and apparatus for fast adaptation of a band-quantized speech decoding system  
A method of performing speaker adaptation of acoustic models in a band-quantized speech recognition system, wherein the system including one or more acoustic models represented by a feature space...
6421388 Method and apparatus for determining PCM code translations  
A method and apparatus for determining the correct decision regions in a PCM communication receiver utilizing a public Digital Telephone Network (DTN). A receiver receives samples from an analog...
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...
6415255 Apparatus and method for an array processing accelerator for a digital signal processor  
A data processing system for use in arrays includes a digital signal processor, a search accelerator unit and memory unit, the memory unit having a group storage locations that store the data...
6411925 Speech processing apparatus and method for noise masking  
A speech processing apparatus is provided in which the distribution of energy with frequency within each frame of an input speech signal is determined and any energy components which are less than...
6397178 Data organizational scheme for enhanced selection of gain parameters for speech coding  
A vector quantizer (VQ) table is arranged in increasing order with regard to a g c gain value (as may be represented by a prediction error energy E n ). The single stage VQ table is then organized...
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...
6385574 Reusing invalid pulse positions in CELP vocoding  
A method and system of vocoding comprising filtering an input signal resulting in an excitation signal having at least one signal pulse translating the location of the signal pulse into one of a...
6377916 Multiband harmonic transform coder  
A speech signal is encoded into a set of encoded bits by digitizing the speech signal to produce a sequence of digital speech samples that are divided into a sequence of frames, each of which spans...
6377914 Efficient quantization of speech spectral amplitudes based on optimal interpolation technique  
A speech coding algorithm interpolates groups speech frames into speech frame pairs, and quantizes each frame of the pair according to a different algorithm. The spectral amplitudes of the second...
6370507 Frequency-domain scalable coding without upsampling filters  
In a method of coding discrete time signals (X 1 ) sampled with a first sampling rate, second time signals (x 2 ) are generated using the first time signals having a bandwidth corresponding to a...
6366881 Voice encoding method  
In a voice coding method for adaptively quantizing a difference d n between an input signal x n and a predicted value y n to code the difference, adaptive quantization is performed such that a...
6363338 Quantization in perceptual audio coders with compensation for synthesis filter noise spreading  
Many perceptual split-band coding systems that use analysis and synthesis filters assume the quantization noise introduced by quantizing split-band signals is substantially the same as the noise...
6353807 Information coding method and apparatus, code transform method and apparatus, code transform control method and apparatus, information recording method and apparatus, and program providing medium  
A code transform apparatus performs fast data transform by enabling intercode data transform. The code transform apparatus includes a code-string decomposing unit for inputting a first code string...
6351730 Low-complexity, low-delay, scalable and embedded speech and audio coding with adaptive frame loss concealment  
High-quality, low-complexity and low-delay scalable and embedded system and method are disclosed for coding speech and general audio signals. The invention is particularly suitable in Internet...
6349284 Scalable audio encoding/decoding method and apparatus  
A scalable audio encoding/decoding method and apparatus are provided. To code an audio signal into layered data streams having a base layer and at least one enhancement layer, the encoding method...
6334105 Multimode speech encoder and decoder apparatuses  
The present invention relates to a low bit rate speech coding apparatus which performs coding on a speech signal for transmission, for example, in a mobile communication system. Excitation...
6330428 Voice quality performance evaluator and method of operation in conjunction with a communication network  
A voice quality performance evaluator includes an interface, memory, processing circuitry and may include a network interface. The interface is adapted to couple to a voice transmission path under...
6330533 Speech encoder adaptively applying pitch preprocessing with warping of target signal  
A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding...
6327563 Wireless microphone system  
In a audio signal coding apparatus, a band separating filter separates a digital audio signal into M bands of audio data. A quantizing circuit quantizes M bands of the audio data. A data grouping...
6324505 Amplitude quantization scheme for low-bit-rate speech coders  
An amplitude quantization scheme for low-bit-rate speech coders includes the first step of extracting a vector of spectral information from a frame. The energy of the vector is normalized to...
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 c r by a weighting...
6304842 Location and coding of unvoiced plosives in linear predictive coding of speech  
A method of encoding signal segments which represent unvoiced plosives. The signal segments to be encoded are contained within a speech signal divided into m=1, . . . , N frames. Each frame is...
6292777 Phase quantization method and apparatus  
A phase quantization method and apparatus in which the phase information of the input signal such as at the time of the sinusoidal synthesis encoding can be quantized efficiently. The phase of the...
6289308 Encoded wideband digital transmission signal and record carrier recorded with such a signal  
Reproduction accuracy of a digital signal, representing for example stereo audio signals, is improved by transmitting sample data which have been encoded to form transmission signals. The...
6275796 Apparatus for quantizing spectral envelope including error selector for selecting a codebook index of a quantized LSF having a smaller error value and method therefor  
An apparatus for quantizing a spectral envelope with noise robustness showing high performance even under a background noise environment and a channel noise environment, and a method therefor, are...
6263307 Adaptive weiner filtering using line spectral frequencies  
An acoustic noise suppression filter including attenuation filtering with a noise-free estimate based on a codebook of line spectral frequencies.
6263312 Audio compression and decompression employing subband decomposition of residual signal and distortion reduction  
A method and apparatus to achieve relatively high quality audio data compression/decompression, while achieving relatively low bit rates (e.g., high compression ratios). According to one aspect of...
Matches 151 - 200 out of 464 < 1 2 3 4 5 6 7 8 9 10 >