| Patent application number | Description | Published |
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| 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 |
| 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 (M| 03-05-2009 | |
| 20090089049 | METHOD AND APPARATUS FOR ADAPTIVELY DETERMINING QUANTIZATION STEP ACCORDING TO MASKING EFFECT IN PSYCHOACOUSTICS MODEL AND ENCODING/DECODING AUDIO SIGNAL BY USING DETERMINED QUANTIZATION STEP - Provided are a method of adaptively determining a quantization step according to a masking effect in a psychoacoustics model and a method of encoding/decoding an audio signal by using the determined quantization step. The method of adaptively determining a quantization step includes calculating a first ratio value indicating an intensity of an input audio signal with respect to a masking threshold; and determining the maximum value of the quantization step in a range in which noise generated when the audio signal is quantized is masked, according to the first ratio value. According to the present invention, quantization noise may be removed and the number of bits required to encode an audio signal may be reduced, by using auditory characteristics of humans. | 04-02-2009 |
| 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 |
| 20110040556 | METHOD AND APPARATUS FOR ENCODING AND DECODING RESIDUAL SIGNAL - A method and apparatus for encoding and decoding a residual signal are provided. The encoding method includes generating a residual signal indicating a difference between a multi-channel audio signal, and an audio signal downmixed from the multi-channel audio signal and then upmixed by using additional information from the downmixed audio signal; and performing a parametric encoding method on the residual signal. The decoding method includes decoding a sinusoidal component; restoring a sine wave by using the sinusoidal component; dividing the sine wave into a plurality of sub-bands in a frequency domain; transforming the plurality of sub-bands from the frequency domain into a time domain by applying a window to each of the plurality of sub-bands; and synthesizing the plurality of domain-transformed sub-bands to restore a residual signal. | 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 |
| 20110046759 | METHOD AND APPARATUS FOR SEPARATING AUDIO OBJECT - Provided is a method of separating an audio object that includes extracting virtual source location information and an audio signal from a bitstream, separating an object included in the audio signal based on a virtual source location, mapping objects of a previous frame and objects of a current frame located at the virtual source location, and extracting the mapped objects between continuous frames. | 02-24-2011 |
| 20110046963 | MULTI-CHANNEL AUDIO DECODING METHOD AND APPARATUS THEREFOR - Provided is a multi-channel audio decoding method and apparatus therefor, the method involving decoding filter bank coefficients of a plurality of bands from a bitstream having a predetermined format; performing frequency transformation on the decoded filter bank coefficients of the plurality of bands, with respect to each of the plurality of bands; compensating for a phase of each of the plurality of bands according to a predetermined phase compensation value, and serially band-synthesizing the frequency-transformed coefficients of each of the plurality of phase-compensated bands on a frequency domain; and decoding a multi-channel audio signal from the band-synthesized frequency-transformed coefficients. | 02-24-2011 |
| 20110046964 | METHOD AND APPARATUS FOR ENCODING MULTI-CHANNEL AUDIO SIGNAL AND METHOD AND APPARATUS FOR DECODING MULTI-CHANNEL AUDIO SIGNAL - A method and apparatus which encode multi-channel audio signals and a method and apparatus which decode multi-channel audio signals. When encoding, a downmixed audio signal, first additional information for restoring multi-channel audio signals from the downmixed audio signal, and second additional information representing characteristics of a residual signal are multiplexed. When decoding, restored multi-channel audio signals having a predetermined phase difference are combined using the second additional information, and an audio signal of each channel is corrected, in order to improve quality of the restored audio signals. | 02-24-2011 |
| 20110047155 | MULTIMEDIA ENCODING METHOD AND DEVICE BASED ON MULTIMEDIA CONTENT CHARACTERISTICS, AND A MULTIMEDIA DECODING METHOD AND DEVICE BASED ON MULTIMEDIA - Metadata includes information for effectively presenting content, and the information included in the metadata includes some information useful for encoding or decoding of multimedia data. Thus, although syntax information of the metadata is provided for an information search, an increase of encoding or decoding efficiency of data can be achieved by using strong connection between the syntax information and the data. | 02-24-2011 |
| 20110047379 | APPARATUS AND METHOD FOR TRANSMITTING DIGITAL MULTIMEDIA BROADCASTING DATA, AND METHOD AND APPARATUS FOR RECEIVING DIGITAL MULTIMEDIA BROADCASTING DATA - Provided are a method and apparatus for transmitting digital multimedia broadcasting data, and a method and apparatus for receiving digital multimedia broadcasting data. A basic audio signal and a multichannel audio signal are encoded to generate a basic audio stream and a multichannel audio stream, and a first data stream describing property and position data of the basic audio stream and a second data stream describing property and position data of the multichannel audio stream are transmitted as independent streams. According to the performance of the receiving apparatus, an audio signal may be decoded by using just the first data stream only or both the first data stream and the second stream. | 02-24-2011 |
| 20110051935 | 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 |
| 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 |
| 20110051939 | 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 |
