Patent application number | Description | Published |
20080228500 | METHOD AND APPARATUS FOR ENCODING/DECODING AUDIO SIGNAL CONTAINING NOISE AT LOW BIT RATE - A method and apparatus for encoding/decoding audio signals at a low bit rate are provided. The encoding apparatus selectively encodes one or more reference samples having the highest amplitudes among frequency samples of an audio signal, determines amplitudes of the remaining samples other than the reference sample according to a predetermined pattern, using a predetermined random function, and then encodes the remaining samples using random function input information for causing the same pattern to be generated using the same random function, thus maximizing an encoding rate for an audio signal having a large amount of noise. | 09-18-2008 |
20080235033 | METHOD AND APPARATUS FOR ENCODING AUDIO SIGNAL, AND METHOD AND APPARATUS FOR DECODING AUDIO SIGNAL - Methods and apparatuses for encoding and decoding of an audio signal using a mixture of a time-frequency method and a parametric method according to the audio band are provided. An encoding method of an audio signal includes: dividing input audio signals into a plurality of audio bands; selecting a coding method for each audio band; encoding each audio band according to the selected coding method for each band; and generating a bit stream including all the data encoded for each audio band, wherein selecting a coding method for each band comprises selecting smaller encoded data either from a parametric coding method or a time-frequency coding method. | 09-25-2008 |
20080235034 | METHOD AND APPARATUS FOR ENCODING AUDIO SIGNAL AND METHOD AND APPARATUS FOR DECODING AUDIO SIGNAL - Provided are a method and apparatus for encoding an audio signal to efficiently encode a harmonic envelope and a method and apparatus for decoding an audio signal to decode the harmonic envelope. The method of encoding an audio signal includes performing harmonic analysis with respect to an input signal to determine harmonic parameters with respect to harmonic signals; regarding amplitudes of the harmonic signals included in the harmonic parameters as signals in the time domain so as to perform time-frequency transformation; and encoding the time-frequency transformed values. When expressing a harmonic envelope, the amplitudes of the harmonic signals are regarded as signals in the time domain so as to perform a time-frequency transformation and only a part from among the transformed values is selected to be encoded. Therefore, sound quality is not affected and coding efficiency greatly improves. | 09-25-2008 |
20080255855 | Method and apparatus for coding and decoding amplitude of partial - Provided are a method and apparatus for coding and decoding an amplitude of partials, in which a step phenomenon can be prevented in the result of coding the amplitude of continuation partial partials in a parametric codec, thereby improving reproduced sound quality. The method of coding the amplitude of partials includes obtaining an inversely quantized amplitude of partials of a previous frame, determining a quantization level based on a function for the inversely quantized amplitude of the partials of the previous frame, and quantizing an amplitude of partials of a current frame based on the determined quantization level. | 10-16-2008 |
20080294445 | METHOD AND APAPRATUS FOR SINUSOIDAL AUDIO CODING - Provided are a method and apparatus for sinusoidal audio coding, which employs a tracking method for further effective coding of sinusoids extracted in the process of a sinusoidal analysis of parametric coding. The sinusoidal audio coding method includes: extracting sinusoids of a current frame by performing a sinusoidal analysis on an input audio signal; with respect to each of the extracted sinusoids, setting a mode selected from a birth mode in which a sinusoid is newly generated irrespective of sinusoids of a previous frame, a continuation mode in which the sinusoid is only one sinusoid continued from one of the sinusoids of the previous frame, and a branch mode in which the sinusoid is one of a plurality of sinusoids continued from one of the sinusoids of the previous frame; and coding the extracted sinusoids according to the selected mode. Accordingly, a plurality of sinusoids that can be continued from one previous track component are set to the continuation mode or the branch mode. Therefore, the number of bits of coded data is significantly reduced, compared with the case of the birth mode. | 11-27-2008 |
20080305752 | METHOD AND APPARATUS FOR SINUSOIDAL AUDIO CODING AND METHOD AND APPARATUS FOR SINUSOIDAL AUDIO DECODING - A method and apparatus for sinusoidal audio coding and decoding are provided. The method for sinusoidal audio coding includes performing sinusoidal analysis on an input signal and extracting sinusoids of a current frame; tracking and coding a continuation mode sinusoid of the current frame by using a sinusoid of a previous frame which continues to the continuation mode sinusoid; searching for a sinusoid having a closest frequency to a frequency of a birth mode sinusoid of the current frame; calculating and coding a difference between an amplitude of the sinusoid having the closest frequency and an amplitude of the birth mode sinusoid; and coding the frequency of the birth mode sinusoid. | 12-11-2008 |
20090024396 | AUDIO SIGNAL ENCODING METHOD AND APPARATUS - An audio signal encoding method and apparatus for efficiently encoding an audio signal in an interval having many birth sinusoids and enabling tracking of sinusoidal signals in the next interval, and a computer readable recording medium having embodied thereon a computer program for executing the audio signal encoding method are provided. According to the method and apparatus, by applying transform coding instead of parametric coding to a frame having many birth sinusoids, the sinusoids are encoded, thereby reducing the number of bits required for the encoding and enabling efficient coding. Also, when transform coding is applied to a frame of a predetermined interval, an inverse transform of the transform coding is applied to the encoded data in order to decode the data, and then sinusoids are extracted from the decoded data, thereby enabling tracking of sinusoids of the next frame. | 01-22-2009 |
20090048826 | 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-readable recording medium having recorded thereon a program for executing the encoding method/the decoding method. By using a particular code indicating that the magnitude of a first sinusoidal signal is less than a masking value according to a psychoacoustic model to encode the first sinusoidal signal, difference coding for a third sinusoidal signal of a next frame, which is connected to the first sinusoidal signal, is performed using a sinusoidal signal or sinusoidal signals selected according to a method to use the particular code, and a decoding apparatus obtains a sum with a transmitted difference using the selected sinusoidal signal(s). | 02-19-2009 |
20090048849 | AUDIO ENCODING METHOD AND APPARATUS, AND AUDIO DECODING METHOD AND APPARATUS, FOR PROCESSING DEATH SINUSOID AND GENERAL CONTINUATION SINUSOID - An audio encoding method and apparatus, and an audio decoding method and apparatus, for processing a death sinusoid and a general continuation sinusoid. Using the unique characteristic of a death sinusoid, in that the death sinusoid has a tendency such that an amplitude component of the death sinusoid is less than that of a previous sinusoid, a method of adding an encoding syntax by distinguishing a general continuation sinusoid from a death sinusoid is provided. That is, when difference coding of the amplitude component of a death sinusoid is performed, the number of bits used when a negative number is coded is less than the number of bits used when a positive number is coded, in a Huffman table. By using this method, a bit rate in an entire coding decreases. | 02-19-2009 |
20090055197 | METHOD AND APPARATUS FOR ENCODING CONTINUATION SINUSOID SIGNAL INFORMATION OF AUDIO SIGNAL AND METHOD AND APPARATUS FOR DECODING SAME - Provided are a method and apparatus for encoding an audio signal and a method and apparatus for decoding an audio signal. The method includes performing sinusoidal analysis on an audio signal in order to extract a sinusoidal signal of a current frame, determining continuation sinusoidal signal information indicating a number of continuation sinusoidal signals of next frames, which continue from the sinusoidal signal of the current frame, by performing sinusoidal tracking on the extracted sinusoidal signal of the current frame, and encoding the determined continuation sinusoidal signal information by using different Huffman tables according to index information of the current frame, thereby allowing efficient encoding with a low bitrate. | 02-26-2009 |
20090060024 | METHOD AND APPARATUS FOR ENCODING/DECODING MEDIA SIGNAL - A method and apparatus for encoding/decoding a media signal. The method of decoding a media signal includes extracting first table index information from a header. The first table index information indicates M (M03-05-2009 | |
20090063161 | METHOD AND APPARATUS FOR ENCODING AND DECODING CONTINUATION SINUSOIDAL SIGNAL OF AUDIO SIGNAL - Provided are an audio signal encoding method and apparatus that encode a continuation sinusoidal signal of a current frame in different ways according to information on a sinusoidal signal of a previous frame by using the characteristics of the continuation sinusoidal signal, and an audio signal decoding method and apparatus. The audio signal encoding method includes extracting a sinusoidal signal of a current frame by performing sinusoidal analysis on an input audio signal; extracting a continuation sinusoidal signal of the current frame, which is connected to a sinusoidal signal of a previous frame, by performing sinusoidal tracking of the extracted sinusoidal signal of the current frame; and encoding the continuation sinusoidal signal in different ways by using information on the sinusoidal signal of the previous frame, which is connected to the continuation sinusoidal signal. | 03-05-2009 |
20090063162 | PARAMETRIC AUDIO ENCODING AND DECODING APPARATUS AND METHOD THEREOF - Provided are parametric audio encoding and decoding apparatuses and methods thereof. In the parametric audio encoding method, an audio signal is segmented into a plurality of segments. At least one sine wave is extracted from each of the segments, and the extracted sine waves are connected. It is determined whether an extracted sine wave is a birth sine wave. If the extracted sine wave is a birth sine wave, a bit stream is generated by encoding the phase of the birth sine wave on the basis of the frequency of the birth sine wave, wherein the number of bits allocated to encode the phase of the birth sine wave is adjusted according to the frequency of the birth sine wave. | 03-05-2009 |
20090063163 | METHOD AND APPARATUS FOR ENCODING/DECODING MEDIA SIGNAL - Provided are a method and apparatus for encoding/decoding a media signal. The method of encoding a media signal includes: when harmonics exist in a sinusoid of a previous frame section, predicting a harmonic frequency of a current frame section that is to be encoded by using a harmonic frequency of the previous frame section, and generating a residual signal by using a difference between the predicted frequency and an actual harmonic frequency of the current frame section. | 03-05-2009 |
20090192789 | METHOD AND APPARATUS FOR ENCODING/DECODING AUDIO SIGNALS - Provided are a method and apparatus for effectively encoding/decoding remaining difference signals excluding sinusoidal components, from input audio signals. In the method and apparatus for encoding audio signals, sinusoidal analysis is performed on low frequency signals of less than a predetermined critical frequency in order to extract sinusoidal signals and then, an encoding operation is performed on the remaining difference signals excluding the sinusoidal signals, from input audio signals, by using linear prediction coding (LPC) analysis. | 07-30-2009 |
20090192792 | METHODS AND APPARATUSES FOR ENCODING AND DECODING AUDIO SIGNAL - Provided are methods and apparatuses for more efficiently encoding and decoding a high frequency band signal which is from an audio signal and which is greater than a predetermined threshold frequency. The method and apparatus for encoding the audio signal encodes a linear prediction coding (LPC) coefficient and gain information of a residual signal, which are generated by performing LPC analysis, thereby encoding a high frequency signal so as to have enhanced sound quality, while using less bits. | 07-30-2009 |
20090198489 | METHOD AND APPARATUS FOR FREQUENCY ENCODING, AND METHOD AND APPARATUS FOR FREQUENCY DECODING - Provided are a method and apparatus for encoding the frequency of a continuation sinusoidal signal and a method and apparatus for decoding the same. In the encoding method, a continuation sinusoidal signal successive to a sinusoidal signal in a previous section is extracted from a current section; a frequency of the continuation sinusoidal signal at the boundary between the current and previous sections is changed to a first frequency, based on representative frequencies of the continuation sinusoidal signal and at least one sinusoidal signal that belongs to a section adjacent to the current section and is successive to the continuation sinusoidal signal; and the first frequency is encoded. | 08-06-2009 |
20090198499 | METHOD AND APPARATUS FOR ENCODING RESIDUAL SIGNALS AND METHOD AND APPARATUS FOR DECODING RESIDUAL SIGNALS - Encoding and decoding of residual signals are provided. In a method of encoding a residual signal of an audio signal, the residual signal is divided into a plurality of sections having different sizes, based on a change of the residual signal. Then, section division information representing information about the divided sections and section-by-section residual signal information representing characteristics of the sections of the residual signal are acquired. Thereafter, the residual signal is encoded based on the section division information and the section-by-section residual signal information. | 08-06-2009 |
20090198501 | METHOD AND APPARATUS FOR ENCODING/DECODING AUDIO SIGNAL USING ADAPTIVE LPC COEFFICIENT INTERPOLATION - Provided are a method and apparatus for encoding or decoding an audio signal by adaptively interpolating a linear predictive coding (LPC) coefficient. In the method and apparatus of encoding or decoding an audio signal, LPC coefficient interpolation is selectively performed depending on whether a transient section is present in a current frame, thereby preventing noise from occurring when interpolating LPC coefficients in the transient section. | 08-06-2009 |
20090210236 | METHOD AND APPARATUS FOR ENCODING/DECODING STEREO AUDIO - Provided are a method and apparatus for encoding/decoding stereo audio. In the method for encoding stereo audio, stereo audio is encoded based on at least one of the phase difference between first and second channel audios and information on an angle made by a vector on the intensity of mono-audio and a vector on the intensity of the first channel audio or a vector on the intensity of the second channel audio. Thus, the number of encoded parameters is minimized so that a compression ratio in the encoding of the stereo audio is improved. | 08-20-2009 |
20110035227 | METHOD AND APPARATUS FOR ENCODING/DECODING AN AUDIO SIGNAL BY USING AUDIO SEMANTIC INFORMATION - An audio signal encoding method and apparatus and an audio signal decoding method and apparatus are provided. The audio signal encoding method includes: transforming an audio signal into a signal of a frequency domain; extracting semantic information from the audio signal; variably reconfiguring one or more sub-bands included in the audio signal by segmenting or grouping the one or more sub-bands using the extracted semantic information; and generating a quantized bitstream by calculating a quantization step size and a scale factor with respect to a reconfigured sub-band of the one or more sub-bands. | 02-10-2011 |
20110038423 | METHOD AND APPARATUS FOR ENCODING/DECODING MULTI-CHANNEL AUDIO SIGNAL BY USING SEMANTIC INFORMATION - A multi-channel audio signal encoding and decoding method and apparatus are provided. The multi-channel audio signal encoding method, the method including: obtaining semantic information for each channel; determining a degree of similarity between multi-channels based on the obtained semantic information for each channel; determining similar channels among the multi-channels based on the determined degree of similarity between the multi-channels; and determining spatial parameters between the similar channels and down-mixing audio signals of the similar channels. | 02-17-2011 |
20110040566 | METHOD AND APPARATUS FOR ENCODING AND DECODING RESIDUAL SIGNAL - A residual signal decoding method including dividing a signal into a plurality of sub-bands in a frequency domain, wherein the signal is in a residual signal and is encoded with respect to an effective residual signal exceeding a masking curve that is generated with respect to a multi-channel audio signal, transforming the frequency domain into a time domain, and restoring the signal as an effective residual signal by synthesizing signals of the domain-transformed sub-bands. | 02-17-2011 |
20110051938 | METHOD AND APPARATUS FOR ENCODING AND DECODING STEREO AUDIO - A method of encoding stereo audio that minimizes a number of pieces of side information required for parametric-encoding and parametric-decoding of the stereo audio. The side information may include parameters about interchannel intensity difference (IID), interchannel correlation (IC), overall phase difference (OPD), and interchannel phase difference (IPD), which are required to restore the mono audio to the stereo audio. | 03-03-2011 |
20110060599 | METHOD AND APPARATUS FOR PROCESSING AUDIO SIGNALS - Methods and apparatuses for encoding and decoding an audio signal are provided, a method of encoding an audio signal including: receiving the audio signal including information about a moving sound source; receiving position information about the moving sound source; generating dynamic track information indicating motion of the moving sound source by using the position information; and encoding the audio signal and the dynamic track information. | 03-10-2011 |
20120033816 | SIGNAL PROCESSING METHOD, ENCODING APPARATUS USING THE SIGNAL PROCESSING METHOD, DECODING APPARATUS USING THE SIGNAL PROCESSING METHOD, AND INFORMATION STORAGE MEDIUM - Provided is a signal processing method for processing a bitstream, an information storage medium including the bitstream, an encoding apparatus, and a decoding apparatus. The signal processing method includes: receiving a bitstream including additional information; extracting first information which is information associated with extraction of the additional information and is included in at least one of additional bitstream information, a skip field, and auxiliary data bits, which are included in the bitstream; and extracting and decoding the additional information by using the first information. | 02-09-2012 |
20120033819 | SIGNAL PROCESSING METHOD, ENCODING APPARATUS THEREFOR, DECODING APPARATUS THEREFOR, AND INFORMATION STORAGE MEDIUM - Provided are a signal processing method capable of inserting additional information into a bitstream without departing from the AC-3 standard or the Enhanced AC-3 standard. The signal processing method includes: extracting additional information which is for performing at least one of a channel number expansion of an audio signal in an encoding apparatus and a three-dimensional (3D) reproduction of the audio signal in the encoding apparatus; encoding the audio signal according to a predetermined standard; formatting the encoded audio signal into a bitstream including bitstream information, at least one audio block and an auxiliary data field; and inserting the additional information into at least one of additional bitstream information included in the bitstream information, a skip field included in the audio block and auxiliary data bits included in the auxiliary data field. | 02-09-2012 |
20120035938 | AUDIO REPRODUCING METHOD, AUDIO REPRODUCING APPARATUS THEREFOR, AND INFORMATION STORAGE MEDIUM - An audio reproducing method for quickly and correctly extracting extra data, including: receiving a data stream including the extra data including an end marker disposed immediately before main data and data length information, which is length information of the extra data, disposed immediately before the end marker; checking the presence/absence of the end marker; and if the end marker exists, extracting the extra data by using the data length information. | 02-09-2012 |
20120035939 | METHOD OF PROCESSING SIGNAL, ENCODING APPARATUS THEREOF, DECODING APPARATUS THEREOF, AND SIGNAL PROCESSING SYSTEM - A method processing a signal, an encoding apparatus, and a decoding apparatus are provided. The method of processing a signal includes restoring a down-mixed original signal using a re-quantized prediction parameter to generate a restored signal in an encoding apparatus; generating mute information indicating whether the down-mixed original signal has been muted, according to a value of the restored signal; and transmitting the mute information and the down-mixed original signal from the encoding apparatus to a decoding apparatus. | 02-09-2012 |
20120035940 | AUDIO SIGNAL PROCESSING METHOD, ENCODING APPARATUS THEREFOR, AND DECODING APPARATUS THEREFOR - An audio signal processing method includes: receiving an audio signal comprising consecutive frames; generating a first encoding parameter corresponding to a first frame among the consecutive frames and a second encoding parameter corresponding to a second frame adjacent to the first frame; and generating at least one interpolated parameter based on the first encoding parameter and the second encoding parameter. | 02-09-2012 |
20120314875 | METHOD AND APPARATUS FOR ENCODING AND DECODING 3-DIMENSIONAL AUDIO SIGNAL - A method of encoding a multi-channel 3-dimensional (3D) audio signal mixed with a multi-channel 3D object signal is provided. The method includes: obtaining a location parameter indicating a virtual location of the multi-channel 3D object signal on a multi-channel speaker layout based on a gain value of the multi-channel 3D object signal for each channel; and encoding the multi-channel 3D audio signal and the location parameter. | 12-13-2012 |
20130064377 | SIGNAL PROCESSING METHOD AND ENCODING AND DECODING APPARATUS - An encoding apparatus includes a down-mixing unit for down-mixing first and second input signals, and controlling a spatial parameter comprising or not comprising a first parameter which indicates a correlation between the first and second input signals to be transmitted to a decoding apparatus according to whether any one of the first and second input signals has a magnitude that is equal to or less than a predetermined threshold value; and a transmitting unit for transmitting the spatial parameter to the decoding apparatus. | 03-14-2013 |
20130066639 | SIGNAL PROCESSING METHOD, ENCODING APPARATUS THEREOF, AND DECODING APPARATUS THEREOF - A signal processing method performed by an encoding apparatus that down-mixes first through n channel signals to a mono-signal, an encoding apparatus, a decoding apparatus, and a decoding method are provided. The signal processing method includes: generating a spatial parameter between a reference channel signal that is from among the first through n channel signals, and residual channel signals from among the first through n channel signals except for the reference channel signal; and encoding and transmitting the spatial parameter to a decoding apparatus, whereby a down-mixed mono-signal may be exactly restored to original channel input signals. | 03-14-2013 |
20130343551 | METHOD AND APPARATUS FOR ENCODING/DECODING STEREO AUDIO - Provided are a method and apparatus for encoding/decoding stereo audio. In the method for encoding stereo audio, stereo audio is encoded based on at least one of the phase difference between first and second channel audios and information on an angle made by a vector on the intensity of mono-audio and a vector on the intensity of the first channel audio or a vector on the intensity of the second channel audio. Thus, the number of encoded parameters is minimized so that a compression ratio in the encoding of the stereo audio is improved. | 12-26-2013 |
20140046670 | AUDIO ENCODING METHOD AND APPARATUS, AUDIO DECODING METHOD AND APPARATUS, AND MULTIMEDIA DEVICE EMPLOYING THE SAME - Provided is a method of encoding an audio signal. A method of encoding an audio signal includes generating a modified signal of a time domain to compensate a frequency resolution in frame units, analysis-windowing the modified signal of the time domain by using a window type which is designed to have an overlapping section less than 50%, and generating transform coefficients of a frequency domain by transforming the analysis-windowed signal of the time domain. | 02-13-2014 |
20140142957 | FRAME ERROR CONCEALMENT METHOD AND APPARATUS, AND AUDIO DECODING METHOD AND APPARATUS - Disclosed are a frame error concealment method and apparatus and an audio decoding method and apparatus. The frame error concealment (FEC) method includes: selecting an FEC mode based on at least one of a state of at least one frame and a phase matching flag, with regard to a time domain signal generated after time-frequency inverse transform processing; and performing corresponding time domain error concealment processing on the current frame based on the selected FEC mode, wherein the current frame is an error frame or the current frame is a normal frame when the previous frame is an error frame. | 05-22-2014 |
20140163999 | METHOD OF ENCODING AND DECODING AUDIO SIGNAL AND APPARATUS FOR ENCODING AND DECODING AUDIO SIGNAL - Exemplary embodiments may provide a method of encoding an audio signal. The method includes: segmenting the audio signal into a plurality of frames, wherein each of the frames includes M samples and M is a natural number greater than one; applying a first window, a second window, and at least one third window to the frames, wherein a length of the second window is longer than a length of the first window, and a length of the third window is longer than the length of the first window and shorter than the length of the second window; time-frequency transforming the frames to which the first window, the second window, and the at least one third window have been applied; and generating a bitstream including the time-frequency transformed frames. | 06-12-2014 |
20140188465 | CODING MODE DETERMINATION METHOD AND APPARATUS, AUDIO ENCODING METHOD AND APPARATUS, AND AUDIO DECODING METHOD AND APPARATUS - Provided are a method and an apparatus for determining an encoding mode for improving the quality of a reconstructed audio signal. A method of determining an encoding mode includes determining one from among a plurality of encoding modes including a first encoding mode and a second encoding mode as an initial encoding mode in correspondence to characteristics of an audio signal, and if there is an error in the determination of the initial encoding mode, generating a modified encoding mode by modifying the initial encoding mode to a third encoding mode. | 07-03-2014 |