Ibex Pt Holdings Co., Ltd.

Wilus Institute of Standards and Technology Inc.

Gaudio Lab, Inc.

Electronics and Telecommunications Research Institute

Yonsei University

Gaudi Audio Lab, Inc.

Gcoa Co., Ltd.

Hyunoh Oh

Taegyu Lee

Kwangje Kim

Jeonghun Seo

Sangbae Chon

Yonghyun Baek

Jinsam Kwak

Juhyung Son

Hyunjoo Chung

Kyutae Park

Kyeongok Kang

Jeongil Seo

Seungkwon Beack

Yongju Lee

Youngcheol Park

Daehee Youn

Daeyoung Jang

Sewoon Jeon

Jaesung Choi

Younghoon Kwon

Byoungjoon Ahn

Jiwon Oh

Cheolwoo Jeong

Jaechan Lee

Kukil Lim

A method for encoding an image includes determining an intra prediction mode of a current block; generating a prediction block of the current block according to the intra prediction mode; generating a residual block by calculating a difference between the current block and the prediction block; transforming the residual block to generate a transform block; quantizing the transform block to generate a quantized block; and entropy-coding coefficients of the quantized block, wherein the generating the prediction block of the current block according to the intra prediction mode includes: generating reference pixels on an unavailable position if there exist unavailable reference pixels of the current block; determining whether reference pixels of the current block are filtered or not based on the intra prediction mode and a block size of the current block; filtering the reference pixels of the current block using a filter if it is determined that the reference pixels of the current block are filtered, wherein the reference pixels are adaptively filtered based on the block size of the current block, wherein the filter is not applied if it is determined that the size of the current block is smaller than a first size, wherein if a number of intra prediction modes to which the filter is applied is increased, it is determined that the size of the current block is larger than the first size and smaller than a second size, and wherein the reference pixels of the current block are not filtered in a horizontal mode because the image is correlated horizontally.

Method of decoding moving pictures in intra prediction

An audio signal processing device comprises: a receiver for receiving an input audio signal; a processor for generating loudness metadata corresponding to the input audio signal; and an outputter for transmitting the loudness metadata generated by the processor. The processor is configured to acquire loudness information analyzed from input content, acquires loudness information about the input audio signal by measuring the loudness of the input audio signal, generates the loudness metadata by converting the loudness information, and transmits, through the outputter, the generated loudness metadata to an output device for outputting the input audio signal.

Audio signal processing method and device for controlling loudness level

A method for performing loudness normalization by an audio signal processing device includes: receiving an audio signal; receiving information relating to integrated loudness of the audio signal; receiving information relating to target loudness of the audio signal; obtaining a corrected integrated loudness by correcting the integrated loudness based on one or more audio processing; and obtaining a normalized audio signal by normalizing the audio signal based on the corrected integrated loudness and the target loudness.

Method for performing normalization of audio signal and apparatus therefor

A method of decoding an image in a merge mode, the method including deriving, by a motion compensation predictor, motion information using effective spatial and temporal merge candidates of a current prediction unit; generating, by the motion compensation predictor, a prediction block of the current prediction unit using the motion information; entropy decoding, by an entropy decoder, a bitstream to generate a quantized coefficient sequence, inversely scanning, by an inverse quantizer/inverse transformer, the quantized coefficient sequence to generate a quantized block, inversely quantizing, by the inverse quantizer/inverse transformer, the quantized block to generate a transformed block using a quantization parameter, and inversely transforming, by the inverse quantizer/inverse transformer, the transformed block to generate a residual block; and generating, by an adder, a reconstructed block using the prediction block and the residual block, wherein a motion vector of the temporal merge candidate is a motion vector of a temporal merge candidate block within a temporal merge candidate picture, and the quantization parameter is derived using an average of two effective quantization parameters among a left quantization parameter, an upper quantization parameter and a previous quantization parameter of a current coding unit, wherein when the quantized block is larger than a predetermined size, the quantized block is generated with plurality of subblocks, and a scan pattern of inversely scanning for the plurality of subblocks is the same as a scan pattern of inversely scanning for quantized coefficients of each subblock, and wherein the bitstream includes information indicating a position of a last non-zero quantized coefficient in a transform unit.

Method for generating prediction block in AMVP mode

A method of decoding video data, the method including via a motion compensation predictor generating a prediction block of a current prediction unit using a reference index and a motion vector of the current prediction unit; via an entropy decoder, entropy decoding a bitstream to generate a quantized coefficient sequence; via an inverse quantizer/inverse transformer, generating a quantized block using the quantized coefficient sequence and inversely quantizing the quantized block to generate a transformed block using a quantization parameter, and inversely transforming the transformed block to generate a residual block, wherein the inverse quantizer/inverse transformer generates the quantization block by selecting two effective quantization parameters that are available and exist among left, upper, and previous quantization parameters according to an order of priority levels set for the left, upper, and previous quantization parameters and using an average of the two effective quantization parameters; and via an adder, generating a reconstructed block using the prediction block and the residual block, wherein the motion vector is derived using a motion vector predictor which is set equal to one of an effective spatial motion vector candidate and an effective temporal motion vector candidate.

A decoding device configured to decode video data, the device including a motion compensation predictor configured to generate a prediction block of a current prediction unit using a reference index and a motion vector of the current prediction unit; an entropy decoder configured to entropy decode a bitstream to generate a quantized coefficient sequence; an inverse quantizer/inverse transformer configured to generate a quantized block using the quantized coefficient sequence and inversely quantize the quantized block to generate a transformed block using a quantization parameter, and inversely transform the transformed block to generate a residual block, wherein the inverse quantizer/inverse transformer generates the quantization block by selecting two effective quantization parameters that are available and exist among left, upper, and previous quantization parameters according to an order of priority levels set for the left, upper, and previous quantization parameters and by using an average of the two effective quantization parameters; and an adder configured to a reconstructed block using the prediction block and the residual block, wherein the motion vector is derived using a motion vector predictor which is set equal to one of an effective spatial motion vector candidate and an effective temporal motion vector candidate.

A transmission method for data comprising a bitstream for an image, the method including obtaining the bitstream for the image; and transmitting the data comprising the bitstream, wherein the bitstream is decoded by a decoding device, wherein the image decoding device is configured to derive, by a motion compensation predictor, motion information using effective spatial and temporal merge candidates of a current prediction unit; generate, by the motion compensation predictor, a prediction block of the current prediction unit using the motion information; entropy decode, by an entropy decoder, a bit stream to generate a quantized coefficient sequence, inversely scan, by an inverse quantizer/inverse transformer, the quantized coefficient sequence to generate a quantized block, inversely quantize, by the inverse quantizer/inverse transformer, the quantized block to generate a transformed block using a quantization parameter, and inversely transform, by the inverse quantizer/inverse transformer, the transformed block to generate a residual block; and generate, by an adder, a reconstructed block using the prediction block and the residual block, wherein a motion vector of the temporal merge candidate is a motion vector of a temporal merge candidate block within a temporal merge candidate picture, and the quantization parameter is derived using an average of two effective quantization parameters among a left quantization parameter, an upper quantization parameter and a previous quantization parameter of a current coding unit, wherein when the quantized block is larger than a predetermined size, the quantized block is generated with plurality of subblocks, and a scan pattern of inversely scanning for the plurality of subblocks is the same as a scan pattern of inversely scanning for quantized coefficients of each subblock, and wherein a scanning scheme for inversely scanning the quantized coefficients is determined according to an intra-prediction mode and a size of a transform unit.

The present invention relates to a method and an apparatus for binaural rendering an audio signal using variable order filtering in frequency domain. To this end, provided are a method for processing an audio signal including: receiving an input audio signal; receiving a set of truncated subband filter coefficients for filtering each subband signal of the input audio signal, the set of truncated subband filter coefficients being constituted by one or more FFT filter coefficients generated by performing FFT by a predetermined block size; generating at least one subframe for each subband; generating at least one filtered subframe for each subband; performing inverse FFT on the filtered subframe for each subband; and generating a filtered subband signal by overlap-adding the transformed subframe for each subband and an apparatus for processing an audio signal using the same.

Method and apparatus for binaural rendering audio signal using variable order filtering in frequency domain

Disclosed is an apparatus for decoding motion information in merge mode for reconstructing a moving picture signal coded at a low data rate while maintaining a high quality of an image. The apparatus for decoding motion information in merge mode discloses the position of a merge mode candidate and the configuration of a candidate in order to predict motion information in merge mode efficiently. Furthermore, a merge candidate indicated by the merge index of a current block can be efficiently reconstructed irrespective of a network environment by adaptively generating a merge candidate based on the number of valid merge candidate.

Apparatus for decoding motion information in merge mode

An apparatus for decoding video data, the apparatus comprising an entropy decoder configured to separate at least motion information, a quantization parameter and a quantized coefficient sequence from a coded bit stream by decoding the coded bit stream; an inverse quantizer/inverse transformer configured to convert the quantized coefficient sequence to a quantization block using a scan pattern, inversely quantize coefficients of the quantization block using the quantization parameter to generate a transform block, and inversely transform the transform block to generate a residual block; and a motion compensation predictor configured to generate a prediction block of a current prediction unit using a reference index and a motion vector derived from the motion information, wherein the inverse quantizer/inverse transformer inversely quantizes the coefficients of the quantization block by selecting two effective quantization parameters that are available and exist among left, upper, and previous quantization parameters according to an order of priority levels set for the left, upper, and previous quantization parameters and using an average of the two effective quantization parameters, and wherein the motion vector is decoded using a motion vector predictor which is set equal to one of an effective spatial motion vector candidate and an effective temporal motion vector candidate.

Disclosed is an audio signal processing method including: receiving a stereo signal; transforming the stereo signal into a frequency-domain signal; rendering the first signal based on a first ipsilateral filter coefficient; generating a frontal ipsilateral signal relating to the frequency-domain signal; rendering the second signal based on a second ipsilateral filter coefficient; generating a side ipsilateral signal relating to the frequency-domain signal; rendering the second signal based on a contralateral filter coefficient; generating a side contralateral signal relating to the frequency-domain signal; transforming an ipsilateral signal, generated by mixing the frontal ipsilateral signal and the side ipsilateral signal, and the side contralateral signal into a time-domain ipsilateral signal and a time-domain contralateral signal, which are time-domain signals, respectively; and generating a binaural signal by mixing the time-domain ipsilateral signal and the time-domain contralateral signal.

Method for generating binaural signals from stereo signals using upmixing binauralization, and apparatus therefor

The present invention relates to a method for generating a filter for an audio signal and a parameterization device for the same, and more particularly, to a method for generating a filter for an audio signal, to implement filtering of an input audio signal with a low computational complexity, and a parameterization device therefor. To this end, provided are a method for generating a filter for an audio signal, including: receiving at least one binaural room impulse response (BRIR) filter coefficients for binaural filtering of an input audio signal; converting the BRIR filter coefficients into a plurality of subband filter coefficients; obtaining average reverberation time information of a corresponding subband by using reverberation time information extracted from the subband filter coefficients; obtaining at least one coefficient for curve fitting of the obtained average reverberation time information; obtaining flag information indicating whether the length of the BRIR filter coefficients in a time domain is more than a predetermined value; obtaining filter order information for determining a truncation length of the subband filter coefficients, the filter order information being obtained by using the average reverberation time information or the at least one coefficient according to the obtained flag information and the filter order information of at least one subband being different from filter order information of another subband; and truncating the subband filter coefficient by using the obtained filter order information and a parameterization device therefor.

Method for generating filter for audio signal, and parameterization device for same

An apparatus for decoding video data and including an entropy decoder configured to separate at least an intra mode index, motion information, a quantization parameter and a quantized coefficient sequence from a coded bit stream by decoding the coded bit stream; an inverse quantizer/inverse transformer configured to convert the quantized coefficient sequence to a quantization block, inversely quantize coefficients of the quantization block using the quantization parameter to generate a transform block, and inversely transform the transform block to generate a residual block; an intra predictor configured to restore an intra prediction mode of a current prediction unit using the intra mode index and generate a prediction block of the current prediction unit according to the intra prediction mode when the coded bit stream is coded in the intra prediction mode; and a motion compensation predictor configured to generate a prediction block of a current prediction unit using a reference index and a motion vector derived from the motion information when the coded bit stream is coded in an inter prediction mode. Further, the motion vector is decoded using a motion vector predictor which is set equal to one of an effective spatial merge candidate and a temporal merge candidate, and a motion vector of the temporal merge candidate is a motion vector of a temporal merge candidate within a temporal merge candidate picture, and the quantization parameter is encoded using an average of two effective quantization parameters among a left quantization parameter, an upper quantization parameter and a previous quantization parameter of a current coding unit, When the quantized block is larger than a predetermined size, the quantized coefficient sequence is inversely scanned in a unit of sub-block using a scan pattern and a plurality of sub-blocks are inversely scanned using a scan pattern, and the scan pattern for inversely scanning the plurality of sub-blocks is the same as the scan pattern for inversely scanning the quantized coefficients sequence. Also, the scan pattern for inversely scanning the quantized coefficients is determined according to the intra prediction mode and a size of a transform unit when the coded bit stream is coded in the intra prediction mode.

Disclosed is a method of operating an audio signal processing apparatus playing content including an audio signal. The method includes receiving the audio signal, receiving metadata including information related to a loudness of the audio signal, the metadata including loudness distribution information indicating, for each of a plurality of steps separated according to a loudness magnitude, a ratio between an amount of the audio signal corresponding to each of the plurality of steps of the audio signal and a total amount of the audio signal, and adjusting the loudness of the audio signal based on the metadata.

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Gwacheon-si, South Korea

Hyunoh Oh