Patent application number | Description | Published |
20080255833 | Scalable Encoding Device, Scalable Decoding Device, and Method Thereof - A scalable encoding device for realizing scalable encoding by CELP encoding of a stereo sound signal and improving the encoding efficiency. In this device, an adder and a multiplier obtain an average of a first channel signal CH | 10-16-2008 |
20080262835 | Encoding Device, Decoding Device, and Method Thereof - There is disclosed an encoding device capable of improving similarity between the high frequency band spectrum of the original signal and a new spectrum to be generated while realizing a low bit rate when encoding a wide-band signal spectrum. The encoding device has sub-band amplitude calculation units ( | 10-23-2008 |
20090094024 | CODING DEVICE AND CODING METHOD - A coding device is provided with features in which optimum coding in a higher layer is flexibly carried out based on a coding result of a lower layer and a quality audio signal in limited circumstances is served to users. In this coding device, a basic layer coding unit codes an input signal to generate a basic layer information source code and outputs a linear prediction coefficient (LPC) and a quantum LPC, which are parameters calculated at coding, to an expanded layer control unit. A basic layer decoding unit decodes the basic layer information source code. An adding unit reverses a polarity of a basic layer decoded signal, adds the same to the input signal, and calculates a difference signal. The expanded layer control unit generates expanded layer mode information indicative of a coding mode in an expanded layer based on the LPC and the quantum LPC. An expanded layer coding unit codes the difference signal obtained from the adding unit under control of the expanded layer control unit. | 04-09-2009 |
20090125300 | SCALABLE ENCODING APPARATUS, SCALABLE DECODING APPARATUS, AND METHODS THEREOF - A scalable encoding apparatus capable of reducing the bit rates of encoded parameters and also capable of efficiently encoding even audio signals in which a plurality of harmonic structures are coexistent. In the apparatus, an MDCT analyzing part ( | 05-14-2009 |
20090157413 | SPEECH ENCODING APPARATUS AND SPEECH ENCODING METHOD - There is provided an audio encoding device capable of maintaining continuity of spectrum energy and preventing degradation of audio quality even when a spectrum of a low range of an audio signal is copied at a high range a plurality of times. The audio encoding device ( | 06-18-2009 |
20090216527 | POST FILTER, DECODER, AND POST FILTERING METHOD - A post filter and a decoder enabling improvement of the sound quality of a decoded signal even when the sound quality of the decoded signal is different from the bands are disclosed. A frequency converting section determines a decoded spectrum. A power spectrum computing section computes the power spectrum from the decoded spectrum. A correction band determining section determines the band in which the power spectrum is corrected according to layer information. A power spectrum correcting section corrects the power spectrum in the corrected band in such a way that the variation along the frequency axis is suppressed. An inverse converting section subjects the corrected power spectrum to inverse conversion to determine an autocorrelation function. An LPC analyzing section determines an LPC coefficient of the determined autocorrelation function. | 08-27-2009 |
20090248407 | SOUND ENCODER, SOUND DECODER, AND THEIR METHODS - A sound encoder enabling prevention of deterioration of the sound quality of a reproduced signal even if the harmonic structure is broken in a part of the sound signal. The filter state position determining section ( | 10-01-2009 |
20090281811 | TRANSFORM CODER AND TRANSFORM CODING METHOD - A transform coder leading to reduction of degradation of perceptual sound quality even if an adequate number of bits is not assigned. Candidates of a correction scale factor stored in a correction scale factor codebook ( | 11-12-2009 |
20100017198 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF - Disclosed is a decoding device and others capable of flexibly calculating high-band spectrum data with a high accuracy in accordance with an encoding band selected by an upper-node layer of the encoding side. In this device: a first layer decoding unit ( | 01-21-2010 |
20100017199 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF - Provided is a decoding device and others which can mitigate the spectrum energy discontinuity and improves the decoded signal quality even when a sub-band is subjected to a spectrum attenuation process in the band extension method. The device includes: a substitution unit ( | 01-21-2010 |
20100017200 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF - Disclosed is an encoding device which can accurately specify a band having a large error among all the bands by using a small calculation amount. The device includes: a first position identification unit ( | 01-21-2010 |
20100017204 | ENCODING DEVICE AND ENCODING METHOD - Provided is a voice encoding device which can accurately encode a spectrum shape of a signal having a strong tonality such as a vowel. The device includes: a sub-band constituting unit ( | 01-21-2010 |
20100049512 | ENCODING DEVICE AND ENCODING METHOD - Disclosed is an encoding device and others capable of suppressing quantization distortion while suppressing increase of a bit rate when encoding audio or the like. In the device, a dynamic range calculation unit ( | 02-25-2010 |
20100057446 | ENCODING DEVICE AND ENCODING METHOD - Provided is an encoding device which can obtain a sound quality preferable for auditory sense even if the number of information bits is small. The encoding device includes a shape quantization unit ( | 03-04-2010 |
20100098199 | POST-FILTER, DECODING DEVICE, AND POST-FILTER PROCESSING METHOD - Provided is a decoding device which suppresses generation of an abnormal sound caused by a layer switch. The decoding device includes: a first layer decoding unit ( | 04-22-2010 |
20100106496 | ENCODING DEVICE AND ENCODING METHOD - Provided is an encoding device which can reduce the encoding distortion as compared to the conventional technique and can obtain a preferable sound quality for auditory sense. In the encoding device, a shape quantization unit ( | 04-29-2010 |
20100138219 | Coding Apparatus and Decoding Apparatus - A coding apparatus capable of coding a spectrum at a low bit rate and with high quality without producing any disturbance in a harmonic structure of the spectrum. In this apparatus, internal state setting section sets an internal state of a filtering section using a first spectrum S | 06-03-2010 |
20100169081 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF - An encoding device includes: a frequency region converter which converts an inputted audio signal into a frequency region; a band selector which selects a quantization object band from a plurality of sub bands obtained by dividing the frequency region; and a shape quantizer which quantizes the shape of the frequency region parameter of the quantization object band. When a prediction encoding presence/absence determiner determines that the number of common sub bands between the quantization object band and the quantization object band selected in the past is not smaller than a predetermined value, a gain quantizer performs prediction encoding on the gain of the frequency region parameter of the quantization object band. When the number of common sub bands is smaller than the predetermined value, the gain quantizer non-predictively encodes the gain of the frequency region parameter of the quantization object band. | 07-01-2010 |
20100228541 | SUBBAND CODING APPARATUS AND METHOD OF CODING SUBBAND - A subband coding apparatus carries out subband coding which prevents deterioration in coding performance and improves audio quality of decoded signals. The subband coding apparatus includes a low-band coding section ( | 09-09-2010 |
20100262421 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF - Provided is an encoding device which improves the sound quality of a stereo signal while maintaining a low bit rate. The encoding device includes: an LP inverse filter ( | 10-14-2010 |
20100274558 | ENCODER, DECODER, AND ENCODING METHOD - An encoder capable of reducing the degradation of the quality of the decoded signal in the case of band expansion in which the high band of the spectrum of an input signal is estimated from the low band. In this encoder, a first layer encoding section ( | 10-28-2010 |
20100280833 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF - Provided is an encoding device which can suppress quality degradation of a decoded signal in a band extension for estimating a high range from a low range of a decoded signal. The encoding device includes: a first layer encoding unit ( | 11-04-2010 |
20100284455 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF - Provided is an encoding device which divides an input signal into a low-range component and a high-range component and encodes the components in separate encoding units. The encoding device can improve quality of a decoded signal. The encoding device ( | 11-11-2010 |
20100332221 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF - It is possible to improve quality of a decoding signal in a band spread for estimating a high band from a low band of a decoding signal. A first layer encoding unit ( | 12-30-2010 |
20100332223 | AUDIO DECODING DEVICE AND POWER ADJUSTING METHOD - Provided is an audio decoding device capable of obtaining a preferable synthesized sound with a stable sound volume. The audio decoding device includes: a post filter ( | 12-30-2010 |
20110137643 | SPECTRAL SMOOTHING DEVICE, ENCODING DEVICE, DECODING DEVICE, COMMUNICATION TERMINAL DEVICE, BASE STATION DEVICE, AND SPECTRAL SMOOTHING METHOD - Disclosed is a spectral smoothing device with a structure whereby smoothing is performed after a nonlinear conversion has been performed for a spectrum calculated from an audio signal, and with which the amount of processing calculation is significantly reduced while maintaining excellent audio quality. With this spectral smoothing device, a sub band division unit ( | 06-09-2011 |
20110264457 | ENCODER, DECODER, ENCODING METHOD, AND DECODING METHOD - An encoding apparatus and method for generating low-frequency-band encoding information and high-frequency-band encoding information from an original signal. The encoding apparatus includes a first spectrum calculator that calculates a first spectrum of a low frequency band from a decoded signal of the low-frequency-band encoding information, a second spectrum calculator that calculates a second spectrum from the original signal, an estimator that divides a high frequency band of the second spectrum into a plurality of bands and estimates the second spectrum included in each band, using the first spectrum, and a first error component encoder that encodes a first error component between the high frequency band of the second spectrum and an estimated spectrum. A corresponding decoding apparatus and method provides decoding. | 10-27-2011 |
20110307248 | ENCODER, DECODER, AND METHOD THEREFOR - Provided is an encoder which can effectively encode/decode spectrum data of a broad frequency signal in a high frequency range, can dramatically reduce the number of the arithmetic operations to be performed, and can improve the quality of the decoded signal. The encoder comprises a first layer coding unit ( | 12-15-2011 |
20110311061 | CHANNEL SIGNAL GENERATION DEVICE, ACOUSTIC SIGNAL ENCODING DEVICE, ACOUSTIC SIGNAL DECODING DEVICE, ACOUSTIC SIGNAL ENCODING METHOD, AND ACOUSTIC SIGNAL DECODING METHOD - Provided is a channel signal generation device capable of avoiding a decrease in the prediction performance for predicting an L channel signal and an R channel signal from a monaural signal and achieving encoding with high sound quality. In the device, a monaural MDCT coefficient corrector ( | 12-22-2011 |
20120045067 | ENCODING DEVICE, DECODING DEVICE, AND METHODS THEREFOR - Disclosed are a encoding device, a decoding device, and encoding and decoding methods, wherein when a multi-channel signal is encoded with high efficiency, using an adaptive filter, the number of arithmetic operations to update a filter coefficient of the adaptive filter can be reduced. An update range determination unit ( | 02-23-2012 |
20120065984 | DECODING DEVICE AND DECODING METHOD - Provided is a decoding device that can reduce abrupt changes in the number of channels in a decoded signal when transmission errors occur as a result of lost frames in an encoding/decoding system for multichannel signals. Said decoding device is also capable of per-sample smoothing and can reduce degradation of audio quality. In the provided device, a demultiplexer ( | 03-15-2012 |
20120136653 | TRANSFORM CODER AND TRANSFORM CODING METHOD - A transform coding apparatus includes an input scale factor calculating section that calculates an input scale factor having a predetermined number of scale factors associated with an input spectrum as an element, and a codebook that stores a plurality of scale factor candidates having a predetermined number of elements and outputs one scale factor candidate. The transform coding apparatus also includes an error calculating section that calculates an error on a per element basis, a weighted error calculating section that determines a weight on a per element basis and calculates a sum of products of the error and the weight to calculate a weighted error, and a searching section that searches for a scale factor candidate that minimizes the weighted error in the codebook. | 05-31-2012 |
20120209596 | ENCODING DEVICE, DECODING DEVICE AND METHOD FOR BOTH - Disclosed are an encoding device and a decoding device which suppress the occurrence of pre-echo artifacts and post-echo artifacts caused by a high layer having a low temporal resolution, and which implement high subjective quality encoding and decoding. An encoding device ( | 08-16-2012 |
20120296640 | ENCODING DEVICE AND ENCODING METHOD - Disclosed are an encoding device and encoding method capable of improving the quality of a decoded signal under very low bit rate conditions using a small amount of computation. A spectrum correction unit ( | 11-22-2012 |
20120296659 | ENCODING DEVICE, DECODING DEVICE, SPECTRUM FLUCTUATION CALCULATION METHOD, AND SPECTRUM AMPLITUDE ADJUSTMENT METHOD - Disclosed is an encoding device whereby it is possible to improve the quality of an encoded signal, even when encoding music signals. In the encoding device, a Code-Excited Linear Prediction (CELP) encoder ( | 11-22-2012 |
20130035943 | ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD AND DECODING METHOD - Disclosed is an encoding device capable of improving decoded signal quality. A local search unit ( | 02-07-2013 |
20130085752 | DECODER, ENCODER, AND METHODS THEREOF - Disclosed is a decoder capable of improving the sound quality of a decoded sound signal in an encoding method which combines speech encoding and music encoding in a hierarchical structure. A transform-encoding decoding unit ( | 04-04-2013 |
20130103394 | DEVICE AND METHOD FOR EFFICIENTLY ENCODING QUANTIZATION PARAMETERS OF SPECTRAL COEFFICIENT CODING - This invention introduces apparatus and methods to efficiently encode the quantization parameters of split multi-rate lattice vector quantization. In this invention, by doing spectral analysis on the split multi-rate vector quantized spectrum, the spectrum is split to null vectors region and non-null vectors region. For the null vectors region, instead of transmitting series of indication for null vectors, an indication of null vectors region and the quantized value of index of the ending vector in the null vectors region (or the number of the null vectors in the null vectors region) are transmitted. The indication of null vectors region can be designed in many ways, the only requirement is the indication should be distinguishable in the decoder side. The ending index or the number of null vectors can be quantized by an adaptively designed codebook. By applying of the invented method, some bits can be saved from the codebook indications. | 04-25-2013 |
20130124201 | DECODING DEVICE, ENCODING DEVICE, AND METHODS FOR SAME - Disclosed is a decoding device which can efficiently encode/decode spectral data in a high pass section of a broadband signal. In the disclosed device: a sample group extraction unit ( | 05-16-2013 |
20130132099 | CODING DEVICE, DECODING DEVICE, AND METHODS THEREOF - Provided are a coding device, a decoding device, and methods thereof, with which it is possible to implement high sound quality coding and decoding in layered coding (scalable coding or embedded coding) wherein each layer comprises a plurality of bit rates (multi-rate). In the coding device ( | 05-23-2013 |
20130166308 | ENCODER APPARATUS AND ENCODING METHOD - Provided is an encoder apparatus that can suppress the quality degradation of encoding processes. An ultimate selection candidate limiting unit ( | 06-27-2013 |
20130173275 | AUDIO ENCODING DEVICE AND AUDIO DECODING DEVICE - Provided is an audio encoding device that can suppress degradation of audio quality. Spectral coefficients of synthesized signal from CELP core layer are utilized to fulfill spectral gaps in error signal spectrum coefficients from a transform coding layer. By both spectral coefficients, decoded signal spectral coefficients are generated. The decoded signal spectral coefficients and the input signal spectral coefficients are divided into a plurality of sub bands. In each sub band, the energy of the input signal spectral coefficient corresponding to a zero decoded error signal spectral coefficient is calculated, and the energy of the decoded signal spectral coefficient corresponding to the zero decoding error signal spectral coefficient is calculated, and their energy ratio is calculated and is quantized and transmitted. | 07-04-2013 |
20130176150 | ENCODING DEVICE AND ENCODING METHOD - An encoding device enables the amount of processing operations to be significantly reduced while minimizing deterioration in the quality of an output signal. This encoding device ( | 07-11-2013 |
20130223633 | STEREO SIGNAL ENCODING DEVICE, STEREO SIGNAL DECODING DEVICE, STEREO SIGNAL ENCODING METHOD, AND STEREO SIGNAL DECODING METHOD - Provided is a stereo signal encoding device that enables a lower bitrate without decreasing quality when applying an intermittent transmission technique to a stereo signal. A stereo encoding unit ( | 08-29-2013 |
20130246075 | CODING APPARATUS, DECODING APPARATUS, CODING METHOD AND DECODING METHOD - There is disclosed an encoding device capable of improving similarity between the high frequency band spectrum of the original signal and a new spectrum to be generated while realizing a low bit rate when encoding a wide-band signal spectrum. The encoding device has sub-band amplitude calculation units for calculating the amplitude of the respective sub-bands for the high frequency band spectrum obtained from the wide-band signal. A search unit and a gain codebook select some sub-bands from a plurality of sub-bands and only the gain of the selected sub-bands is subjected to encoding. An interpolation unit expresses the gain of the sub-band not selected, by mutually interpolating the selected gains. | 09-19-2013 |
20130325457 | ENCODING APPARATUS, DECODING APPARATUS, ENCODING METHOD AND DECODING METHOD - An encoding apparatus includes a first layer encoder that encodes a signal, a first layer decoder that decodes first layer encoded data, a first layer error transform coefficient calculator that transforms a first layer error signal into a frequency domain and a second layer encoder that encodes the first layer error transform coefficient to acquire second layer encoded data. The second layer encoder includes a band determiner that determines a band to be encoded by the second layer encoder, and a first shape vector encoder that refers the first layer error transform coefficient included in the band to generate a first shape vector and first shape encoded information, a target gain calculator calculates target gain per subband, a gain vector generator generates a gain vector using a plurality of target gains, and a gain vector encoder encodes the gain vector to acquire gain encoded information. | 12-05-2013 |
20130332150 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF FOR SPECIFYING A BAND OF A GREAT ERROR - Disclosed is an encoding device which can accurately specify a band having a large error among all the bands by using a small calculation amount. A first position identifier uses a first layer error conversion coefficient indicating an error of a decoding signal for an input signal so as to search for a band having a large error in a relatively wide bandwidth in all the bands of the input signal and generates first position information indicating the identified band. A second position identifier searches for a target frequency band having a large error in a relatively narrow bandwidth in the band identified by the first position identifier and generates second position information indicating the identified target frequency band. An encoder encodes a first layer decoding error conversion coefficient contained in the target frequency band. | 12-12-2013 |
20130332154 | ENCODING APPARATUS, DECODING APPARATUS, ENCODING METHOD AND DECODING METHOD - An encoding apparatus includes a first layer encoder that encodes an input signal, a first layer decoder that decodes the first layer encoded data, a weighting filter that filters a first layer error signal to acquire a weighted first layer error signal, a first layer error transform coefficient calculator that transforms the weighted first layer error signal into a frequency domain, and a second layer encoder that encodes the first layer error transform coefficient. The second layer encoder includes a first shape vector encoder that refers the first layer error transform coefficient to generate a first shape vector and first shape encoded information. A target gain calculator calculates a target gain using the first layer error transform coefficient and the first shape vector, a gain vector generator generates a gain vector, and a gain vector encoder encodes the gain vector to acquire gain encoded information. | 12-12-2013 |
20130339012 | SPEECH/AUDIO ENCODING APPARATUS, SPEECH/AUDIO DECODING APPARATUS, AND METHODS THEREOF - Provided is a speech/audio encoding apparatus with which it is possible to code a significant frequency domain region with high precision, and to enable high audio quality. A speech/audio encoding apparatus codes a linear prediction coefficient. A significant frequency domain region detection unit identifies a frequency domain region which is aurally significant from the linear prediction coefficient. A frequency domain region repositioning unit repositions the significant frequency domain region which is identified by the significant frequency domain region detection unit. A bit allocation computation unit determines a coding bit allocation on the basis of the significant frequency domain region which is repositioned by the frequency domain region repositioning unit. | 12-19-2013 |
20140019144 | ENCODING DEVICE, DECODING DEVICE, AND METHOD THEREOF FOR SECIFYING A BAND OF A GREAT ERROR - Disclosed is an encoding device which can accurately specify a band having a large error among all the bands by using a small calculation amount. A first position identifier uses a first layer error conversion coefficient indicating an error of a decoding signal for an input signal so as to search for a band having a large error in a relatively wide bandwidth in all the bands of the input signal and generates first position information indicating the identified band. A second position identifier searches for a target frequency band having a large error in a relatively narrow bandwidth in the band identified by the first position identifier and generates second position information indicating the identified target frequency band. An encoder encodes a first layer decoding error conversion coefficient contained in the target frequency band. | 01-16-2014 |
20140114651 | DEVICE AND METHOD FOR EXECUTION OF HUFFMAN CODING - In this invention, the design of the Huffman table can be done offline with a large input sequence database. The range of the quantization indices (or differential indices) for Huffman coding is identified. For each value of range, all the input signal which have the same range will be gathered and the probability distribution of each value of the quantization indices (or differential indices) within the range is calculated. For each value of range, one Huffman table is designed according to the probability. And in order to improve the bits efficiency of the Huffman coding, apparatus and methods to reduce the range of the quantization indices (or differential indices) are also introduced. | 04-24-2014 |
20140122065 | VOICE CODING DEVICE, VOICE DECODING DEVICE, VOICE CODING METHOD AND VOICE DECODING METHOD - A voice coding device capable of preventing overall quality degradation even when the bit rate for coding is lowered. The voice coding device codes a wide band signal in a first layer, and codes an extended band signal whose frequency band is located in higher frequency than the wide band signal in an extended band layer. An adaptive band selection unit ( | 05-01-2014 |
20140200901 | ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD AND DECODING METHOD - By copying to a high-frequency band portion (extension band) a low-frequency band portion in which peaking has been set to a sufficiently low state, this encoding device is capable of preventing generation of a spectrum with overly high peaking in the high-frequency band portion, and of generating a high-quality extension band spectrum. This device comprises: a maximum value search unit which searches, in each of multiple sub-bands obtained by dividing the low-frequency band portion of an audio signal and/or music signal below a prescribed frequency, for the maximum value of the amplitude of a first spectrum obtained by decoding first encoded data, which is encoded data in the low-frequency band portion; and an amplitude normalization unit which obtains a normalized spectrum by normalizing, at the maximum values of the amplitude of each sub-band, the first spectrum contained in each sub-band. | 07-17-2014 |
20140244274 | ENCODING DEVICE AND ENCODING METHOD - An encoding device is disclosed in which frequency domain converters ( | 08-28-2014 |
20140249806 | AUDIO ENCODING APPARATUS, AUDIO DECODING APPARATUS, AUDIO ENCODING METHOD, AND AUDIO DECODING METHOD - An audio encoding apparatus capable of reducing the bit rate even if a codebook having a larger codebook number is selected in a split multi-rate lattice vector quantization is provided. Sub-vector determining unit ( | 09-04-2014 |
20140257825 | ENCODING APPARATUS AND ENCODING METHOD - Provided is an encoding apparatus. A threshold value calculating unit ( | 09-11-2014 |
20140343932 | SPEECH DECODING DEVICE AND SPEECH DECODING METHOD - The present invention pertains to a speech decoding device that is capable of preventing degradation in sound quality associated with an adjustment of the slope of a spectrum of an output signal (a decoding signal), making it less likely that a loss of bandwidth sensitivity due to the attenuation of a higher band region is perceived. For each frame of the bandwidth extension layer decoding signal, a filter assessment unit ( | 11-20-2014 |
20150025879 | AUDIO AND SPEECH CODING DEVICE, AUDIO AND SPEECH DECODING DEVICE, METHOD FOR CODING AUDIO AND SPEECH, AND METHOD FOR DECODING AUDIO AND SPEECH - This invention introduces audio/speech encoding apparatus audio/speech decoding apparatus, audio/speech encoding method and audio/speech decoding method to efficiently encode the quantization parameters of split multi-rate lattice vector quantization. In this invention, the position of the sub-vector whose codebook indication consumes the most bits is firstly located, and then the value of the codebook is estimated based on the total number of bits available and the bits usage information for other sub-vectors. The difference value is calculated between the actual value and estimated value. Finally, instead of transmitting the codebook indication which consumes the most bits, the position of the sub-vector whose codebook indication consumes the most bits and the difference value between the actual value and the estimated value are transmitted. By applying of the invented method, bits can be saved by the codebook indications. | 01-22-2015 |