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| Number | Title | Issue Date |
| 8407043 | Computationally efficient audio coder The present invention provides a computationally efficient technique for compression encoding of an audio signal, and further provides a technique to enhance the sound quality of the encoded audio signal. This is accomplished by including more accurate attack detect... | 03/26/2013 |
| 8386242 | Method, medium and apparatus enhancing a bass signal using an auditory property Provided are a method, medium and apparatus for enhancing an acoustic signal using an auditory property. An acoustic signal is enhanced by generating a plurality of harmonic signals based on a predetermined acoustic signal frequency, selecting harmonic signals, whic... | 02/26/2013 |
| 8326606 | Sound encoding device and sound encoding method A sound encoding device enabling the amount of delay to be kept small and the distortion between frames to be mitigated. In the sound encoding device, a window multiplication part (211) of a long analysis section (21) multiplies a long analysis frame s... | 12/04/2012 |
| 8306811 | Embedding data in audio and detecting embedded data in audio A method of embedding data into an audio signal provides a data sequence for embedding in the audio signal and computes masking thresholds for the audio signal from a frequency domain transform of the audio signal. The masking thresholds correspond to subbands of th... | 11/06/2012 |
| 8296131 | Method and apparatus of providing a quality measure for an output voice signal generated to reproduce an input voice signal A method of providing a quality measure for an output voice signal generated to reproduce an input voice signal, the method comprising: partitioning the input and output signals into frames; for each frame of the input signal, determining a disturbance relative to e... | 10/23/2012 |
| 8195449 | Low-complexity, non-intrusive speech quality assessment A non-intrusive signal quality assessment apparatus includes a feature vector calculator that determines parameters representing frames of a signal and extracts a collection of per-frame feature vectors (φ;(n)) representing structural information of the signal from... | 06/05/2012 |
| 8165871 | Encoding method and apparatus for efficiently encoding sinusoidal signal whose magnitude is less than masking value according to psychoacoustic model and decoding method and apparatus for decoding encoded sinusoidal signal Provided are an encoding method and apparatus for efficiently encoding a sinusoidal signal whose magnitude is less than a masking value according to a psychoacoustic model, a decoding method and apparatus for decoding an encoded sinusoidal signal, and a computer-rea... | 04/24/2012 |
| 8145475 | Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, ... | 03/27/2012 |
| RE43209 | Speech coding apparatus and speech decoding apparatus A speech coding apparatus comprises a repetition period pre-selecting unit for generating a plurality of candidates for the repetition period of a driving excitation source by multiplying the repetition period of an adaptive excitation source by a plurality of const... | 02/21/2012 |
| RE43190 | Speech coding apparatus and speech decoding apparatus A speech coding apparatus comprises a repetition period pre-selecting unit for generating a plurality of candidates for the repetition period of a driving excitation source by multiplying the repetition period of an adaptive excitation source by a plurality of const... | 02/14/2012 |
| RE43189 | Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods a... | 02/14/2012 |
| 8117027 | Method and apparatus for introducing information into a data stream and method and apparatus for encoding an audio signal Techniques for introducing information into a data stream first obtains the spectral values of the short-term spectrum of the audio signal. Separately, information to be introduced are combined with a spread sequence obtaining a spread information signal, whereupon ... | 02/14/2012 |
| 8073684 | Apparatus and method for automatic classification/identification of similar compressed audio files An audio file is divided into frames in the time domain and each frame is compressed, according to a psycho-acoustic algorithm, into file in the frequency domain. Each frame is divided into sub-bands and each sub-band is further divided into split sub-bands. The spe... | 12/06/2011 |
| 8046214 | Low complexity decoder for complex transform coding of multi-channel sound A multi-channel audio decoder provides a reduced complexity processing to reconstruct multi-channel audio from an encoded bitstream in which the multi-channel audio is represented as a coded subset of the channels along with a complex channel correlation matrix para... | 10/25/2011 |
| 8036882 | Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods a... | 10/11/2011 |
| 8036880 | Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods a... | 10/11/2011 |
| 8036881 | Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods a... | 10/11/2011 |
| 7953595 | Dual-transform coding of audio signals Methods, devices, and systems for coding and decoding audio are disclosed. At least two transforms are applied on an audio signal, each with different transform periods for better resolutions at both low and high frequencies. The transform coefficients are selected ... | 05/31/2011 |
| 7945440 | Audio stream notification and processing Various embodiments provide techniques for allowing an application to opt out of system default audio stream behavior, as well as techniques for notifying applications on a computing device that a communication audio stream has been initiated. The techniques may dif... | 05/17/2011 |
| 7930171 | Multi-channel audio encoding/decoding with parametric compression/decompression and weight factors The invention includes several techniques and tools, which can be used in combination or separately. For example, an audio encoder can encode information directly using coding processes that include a windowed overlapped transform, a selective multi-channel transfor... | 04/19/2011 |
| 7930170 | Computationally efficient audio coder The present invention provides a computationally efficient technique for compression encoding of an audio signal, and further provides a technique to enhance the sound quality of the encoded audio signal. This is accomplished by including more accurate attack detect... | 04/19/2011 |
| 7921007 | Scalable audio coding The invention relates to an audio encoder and decoder and methods for audio encoding and decoding. In a preferred encoder embodiment an audio signal is encoded by deterministic encoder means to form a first encoded signal part. A spectrum of the audio signal is dete... | 04/05/2011 |
| 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 transient within one of the frames is identified, and transform data sam... | 02/22/2011 |
| 7873510 | Adaptive rate control algorithm for low complexity AAC encoding A system and method for adaptive rate control in audio processing is provided. The process could include receiving uncompressed audio data from an input and generating MDCT spectrum for each frame of the uncompressed audio data using a filterbank. The process could ... | 01/18/2011 |
| 7835904 | Perceptual, scalable audio compression The perceptual scalable audio coding/decoding technique lies in the use of a psychoacoustic mask to guide residue coding in enhancement layer coders. At the encoder, a psychoacoustic mask is calculated for the enhancement layer coders or is simply extracted from the... | 11/16/2010 |
| 7818167 | Method, medium, and system for music retrieval using modulation spectrum An audio information retrieval method, medium, and system that can rapidly retrieve audio information, even in noisy environments, by extracting a modulation spectrum that is robust against noise, converting features of the extracted modulation spectrum into hash bi... | 10/19/2010 |
| 7792668 | Slot position coding for non-guided spatial audio coding Spatial information associated with an audio signal is encoded into a bitstream, which can be transmitted to a decoder or recorded to a storage media. The bitstream can include different syntax related to time, frequency and spatial domains. In some embodiments, the... | 09/07/2010 |
| 7788090 | Combined audio coding minimizing perceptual distortion An audio encoder in which two or more preferably different encoders cooperate to generate a joint encoded audio signal. Encoding parameters of the two or more encoders are optimized in response to a measure of distortion of the joint encoded audio signal in accordan... | 08/31/2010 |
| 7742912 | Method and apparatus to encode and decode multi-channel audio signals An encoder (100) for encoding a multi-channel audio signal comprises a prediction processor (101) for generating two residual signals for two signal components of the multi-channel signal by linear prediction which is associated with psycho-acoustic ch... | 06/22/2010 |
| 7739105 | System and method for processing audio frames In accordance with a specific implementation of the disclosure, a stream of audio frames is received and compressed using psycho-acoustical processing. The signal-to-mask ratio table generated by the psycho-acoustical algorithm is updated using only a portion of the... | 06/15/2010 |
| 7729903 | Audio coding The central idea of the present invention is that the prior procedure, namely interpolation relative to the filter coefficients and the amplification value, for obtaining interpolated values for the intermediate audio values starting from the nodes has to be dismiss... | 06/01/2010 |
| 7716042 | Audio coding Coding an audio signal of a sequence of audio values into a coded signal includes determining first and second listening thresholds for first and second blocks of audio values of the sequence of audio values; calculating versions of first second parameterizations of... | 05/11/2010 |
| 7698130 | Audio encoding method and apparatus obtaining fast bit rate control using an optimum common scalefactor Provided are an audio encoding method and apparatus capable of fast bit rate control. The audio encoding method includes: converting audio sampling data into frequency domain data; adjusting a scalefactor value in each predetermined frequency band based on an availa... | 04/13/2010 |
| 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 voice and musical tone coding apparatus, a quadrature transformation p... | 04/06/2010 |
| 7650277 | System, method, and apparatus for fast quantization in perceptual audio coders A technique to encode an audio signal based on a perceptual model. In one example embodiment, this is accomplished by shaping quantization noise in the spectral lines on a band-by-band basis using their local gains. The noise shaped spectral lines are then fitted wi... | 01/19/2010 |
| 7650278 | Digital signal encoding method and apparatus using plural lookup tables A digital signal encoding method and apparatus using a plurality of lookup tables. The method includes: preparing a plurality of lookup tables storing numbers of allocated bits for encoding frequency bands of an input signal according to a characteristic of the inpu... | 01/19/2010 |
| 7647221 | Audio level control for compressed audio Audio level control is provided for compressed audio. Scale factors for the compressed audio are extracted from an MPEG audio data stream, the extracted scale factors are altered without decompressing the compressed audio, and the MPEG audio data stream is updated w... | 01/12/2010 |
| 7620543 | Method, medium, and apparatus for converting audio data A method, medium, and apparatus for converting compressed audio data, including decoding compressed audio input data, in accordance with a corresponding compression format, coding a result of the decoding, in accordance with a predetermined compression format, and c... | 11/17/2009 |
| 7613603 | Audio coding device with fast algorithm for determining quantization step sizes based on psycho-acoustic model An efficient audio coding device that quantizes and encodes digital audio signals with a reduced amount of computation. A spatial transform unit subjects samples of a given audio signal to a spatial transform, thus obtaining transform coefficients of the signal. Wit... | 11/03/2009 |
| 7610195 | Decoding of predictively coded data using buffer adaptation A decoder (e.g., an AAC-LTP decoder) receives a stream containing coded audio data and prediction data. The coded data is upsampled or downsampled during decoding. Portions of the decoded data are stored in a buffer for use in decoding subsequent coded data. The buf... | 10/27/2009 |
