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| Number | Title | Issue Date |
| 8099276 | Sound quality control device and sound quality control method According to one embodiment, a sound quality control device includes: a time domain analysis module configured to perform a time-domain analysis on an audio-input signal; a frequency domain analysis module configured to perform a frequency-domain analysis on a frequ... | 01/17/2012 |
| 8090577 | Bandwidth-adaptive quantization Methods and apparatus are presented for determining the type of acoustic signal and the type of frequency spectrum exhibited by the acoustic signal in order to selectively delete parameter information before vector quantization. The bits that would otherwise be allo... | 01/03/2012 |
| 8019600 | Speech signal compression and/or decompression method, medium, and apparatus A speech signal compression and/or decompression method, medium, and apparatus in which the speech signal is transformed into the frequency domain for quantizing and dequantizing information of frequency coefficients. The speech signal compression apparatus includes... | 09/13/2011 |
| 8019601 | Audio coding device with two-stage quantization mechanism An audio coding device that optimizes quantization parameters for fast convergence of iterations. A quantized bit counter calculates a codeword length representing the number of bits of a Huffman codeword corresponding to quantized values. The quantized bit counter ... | 09/13/2011 |
| 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 determining section for obtaining an inputted speech signal and quantiz... | 02/15/2011 |
| 7848925 | Scalable encoding apparatus, scalable decoding apparatus, scalable encoding method, scalable decoding method, communication terminal apparatus, and base station apparatus A scalable encoding apparatus, a scalable decoding apparatus and the like are disclosed which can achieve a band scalable LSP encoding that exhibits both a high quantization efficiency and a high performance. In these apparatuses, a narrow band-to-wide band converte... | 12/07/2010 |
| 7835907 | Method and apparatus for low bit rate encoding and decoding An apparatus and method of low bit rate encoding and reproducing. The method includes transforming input audio signals in a time domain into spectral signals in a frequency domain, extracting important-spectrum components from the spectral signals in the frequency d... | 11/16/2010 |
| 7813922 | Audio quantization For supporting a selection of a predictive or non-predictive quantization in the scope of an audio signal coding, it is determined whether an error resulting with a non-predictive quantization of an audio signal segment lies below a predetermined threshold value. An... | 10/12/2010 |
| 7797155 | System and method for measurement of perceivable quantization noise in perceptual audio coders A technique for computing perceptual noise in an audio signal that is computationally efficient. In one example embodiment, the technique includes computing perceptual noise in an input audio signal. The steps involve pre-computing NER (noise-to-excitation ratio) va... | 09/14/2010 |
| 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 second or upper layer section performs low bit-rate encoding. In the encod... | 08/03/2010 |
| 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 electrical signal in a manner which maximizes the compression of the signal whi... | 08/03/2010 |
| 7756705 | Method and apparatus for diversity control in multiple description voice communication A method and apparatus for performing multiple descriptive source coding in which a plurality of homogeneous encoders are advantageously employed in combination with a corresponding plurality of advantageously substantially identical decoders. In particular, diversi... | 07/13/2010 |
| 7684981 | Prediction of spectral coefficients in waveform coding and decoding Techniques and tools for prediction of spectral coefficients in encoding and decoding are described herein. For certain types and patterns of content, coefficient prediction exploits correlation between adjacent spectral coefficients, making subsequent entropy encod... | 03/23/2010 |
| 7672842 | Method and system for FFT-based companding for automatic speech recognition A method and system processes a speech signal. A fast Fourier transform is performed on a speech signal to produce a speech signal having a plurality of frequency bands in a frequency domain. For each frequency bands, filter the speech signal in the frequency domain... | 03/02/2010 |
| 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 coefficient value and a distribution of transform coefficient values acro... | 02/23/2010 |
| 7657429 | Coding apparatus and coding method for coding with reference to a codebook A coding apparatus includes a fourth layer codebook that shows N number of codes indicating uniquely respective N integers that increment one by one; and first to third layer codebooks that show M number of codes indicating uniquely respective M integers that are a ... | 02/02/2010 |
| 7647223 | Robust composite quantization with sub-quantizers and inverse sub-quantizers using illegal space A sub-quantizer for sub-quantization of a vector includes a sub-codevector generator that generates a set of candidate sub-codevectors, and transformation logic that transforms each candidate sub-codevector into a corresponding codevector. A memory stores an illegal... | 01/12/2010 |
| 7640157 | Systems and methods for low bit rate audio coders A technique to enhance audio quality of a quantized audio signal when a perceptual audio coder is operating at low bit rates. The perceptual audio coder uses a modified two-loop quantization technique that maintains audio quality at medium to high bit rates while el... | 12/29/2009 |
| 7630889 | Code conversion method and device A code conversion method for converting first code string data conforming to a first speech coding scheme into second code string data conforming to a second speech coding scheme has the steps of decoding the first code string data to generate a first decoded speech... | 12/08/2009 |
| 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 the LSF coefficient quantizing method includes: removing the direct cu... | 12/08/2009 |
| 7617100 | Method and system for providing an excitation-pattern based audio coding scheme An improved audio compression scheme is provided. The scheme uses an excitation pattern to more efficiently provide audio signal compression. Under the scheme, an input signal is transformed to the frequency domain. Next, the excitation pattern corresponding to the ... | 11/10/2009 |
| RE40968 | Encoding and decoding apparatus of LSP (line spectrum pair) parameters An encoding and decoding apparatus quantizes LSP (Line Spectrum Pair) parameters, which are characteristics parameters of spectrum information included in a voice signal, with high accuracy and stability. This encoding and decoding apparatus comprises a first quanti... | 11/10/2009 |
| 7610198 | Robust quantization with efficient WMSE search of a sign-shape codebook using illegal space A method of searching a signed codebook to quantize a vector includes weighting a shape codevector in a set of shape codevectors with a weighting function for a Weighted Mean Square Error (WMSE) criteria, to produce a weighted shape codevector. The method further in... | 10/27/2009 |
| 7590532 | Voice code conversion method and apparatus It is so arranged that a voice code can be converted even between voice encoding schemes having different subframe lengths. A voice code conversion apparatus demultiplexes a plurality of code components (Lsp1, Lag1, Gain1, Cb1), which are... | 09/15/2009 |
| 7584096 | Method and apparatus for encoding speech A method of encoding speech in a communications system includes the steps of receiving a speech signal including voice signals and background signals, and detecting voice activity and providing an indicator when no voice activity is detected. The speech signal is en... | 09/01/2009 |
| 7574355 | Apparatus and method for determining a quantizer step size For determining a quantizer step size for quantizing a signal including audio or video information, a first quantizer step size as well as an interference threshold are provided. Then, the actual interference introduced by the first quantizer step size is determined... | 08/11/2009 |
| 7548855 | Techniques for measurement of perceptual audio quality An audio processing tool measures the quality of reconstructed audio data. For example, an audio encoder measures the quality of a block of reconstructed frequency coefficient data in a quantization loop. The invention includes several techniques and tools, which ca... | 06/16/2009 |
| 7546240 | Coding with improved time resolution for selected segments via adaptive block transformation of a group of samples from a subband decomposition A transform coder is described that performs a time-split transform in addition to a discrete cosine type transform. A time-split transform is selectively performed based on characteristics of media data. Transient detection identifies a changing signal characterist... | 06/09/2009 |
| 7536302 | Method, process and device for coding audio signals A method and a device for audio coding are disclosed. An audio coding device includes an audio coder for receiving audio signals and generating base data and enhancement data; and a rearranging device coupled to the audio coder. The rearranging device rearranges the... | 05/19/2009 |
| 7505900 | Signal encoding apparatus, signal encoding method, and program The present invention intends to render quantization noise virtually imperceptible for a user and to prevent reduction in frequency resolution and reduction in encoding efficiency. A signal encoding apparatus includes: a quantization unit for quantizing an in... | 03/17/2009 |
| 7490037 | Method and apparatus for encoding signals The invention concerns a method of encoding signals, in particular digitized audio signals, with an encoding device for encoding the signal in an encoding format and a processing device for processing the encoded signal. Methods of that kind are known for exa... | 02/10/2009 |
| 7460993 | Adaptive window-size selection in transform coding A transform coder adaptively configures window sizes for transform coding in a two-pass process to maximize coding efficiency, while achieving necessary time resolution to avoid pre-echo. In a first pass, the coder places small size windows over detected transient r... | 12/02/2008 |
| 7447631 | Audio coding system using spectral hole filling Audio coding processes like quantization can cause spectral components of an encoded audio signal to be set to zero, creating spectral holes in the signal. These spectral holes can degrade the perceived quality of audio signals that are reproduced by audio coding sy... | 11/04/2008 |
| 7426466 | Method and apparatus for quantizing pitch, amplitude, phase and linear spectrum of voiced speech A method and apparatus for predictively quantizing voiced speech includes a parameter generator and a quantizer. The parameter generator is configured to extract parameters from frames of predictive speech such as voiced speech, and to transform the extracted inform... | 09/16/2008 |
| 7418395 | Method and system for reduction of quantization-induced block-discontinuities and general purpose audio codec A method and system for reduction of quantization-induced block-discontinuities arising from lossy compression and decompression of continuous signals, especially audio signals. One embodiment encompasses a general purpose, ultra-low latency, efficient audio codec a... | 08/26/2008 |
| 7408918 | Methods and apparatus for lossless compression of delay sensitive signals Methods and apparatus are provided for compressing delay sensitive signals. Frames including multiple samples of the delay sensitive signal are analyzed to determine characteristics associated with the frames, such as the range of quantization levels represented by ... | 08/05/2008 |
| 7400651 | Device and method for interpolating frequency components of signal A frequency interpolation apparatus is provided which reproduces a signal similar to an original signal by approximately recovering suppressed frequency components, from an input signal having the suppressed frequency components in a specific frequency band of the o... | 07/15/2008 |
| 7391814 | Gain control method and apparatus An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of ... | 06/24/2008 |
| 7373282 | Fault severity check and source identification A fault severity check and source identification method for a frequency domain instrument accesses acquired reflection data for a transmission line under test. From the acquired data reflection surfaces are isolated as a function of distance. Each reflection surface... | 05/13/2008 |
| 7373293 | Quantization noise shaping method and apparatus A method and apparatus for shaping quantization noise generated when compressing audio data at a low bit rate is disclosed. A predetermined quantization noise threshold allowed during quantization of sampled audio data and quantization noise energy information of a ... | 05/13/2008 |
