Abstract:
A Unified Speech and Audio Codec (USAC) for adjusting an overlap area of a window based on a transition is provided. To increase an encoding efficiency, encoding may be performed by overlapping relatively long windows. Additionally, when a transition is generated between frames, an overlap area of a window may be reduced based on the transition, thereby preventing a noise from occurring due to the transition.
Abstract:
PURPOSE: An integration sound source separating device and method thereof are provided to efficiently separate various sound sources within mixing sound signal. CONSTITUTION: A first sound source divider(110) divides a first sound source from a mixed sound signal through the feature of a temporal and frequency domain. A second sound source divider(120) divides a second sound source from the mixing sound signal through stereo channel information. A post-processing unit(130) extracts residual component information from the residual sound source information. A combiner(140) combines second sound source and residual component.
Abstract:
PURPOSE: An integration voice/audio coding/decoding apparatus and method thereof are provided to reduce pre-echo which is generated in a transient section by controlling an overlap domain of a window. CONSTITUTION: An integration voice/audio coding/decoding apparatus includes a detection unit, a first encoding unit, a second encoding unit, and a bit stream formatter. The first encoding unit encodes an input signal and detects a second transient section from an encoded result. The second encoding unit controls the length of an overlap domain and encodes the input signal. The bit stream formatter generates bit stream and the input signal.
Abstract:
PURPOSE: A window processing for interconnecting between an MDTC(Modified Discrete Cosine Transform) frame and a heterogeneous frame is provided to satisfy TDAC conditions for the recovery of an original signal. CONSTITUTION: A frame applying unit(601) applies a window to a current frame. A window folding unit(602) performs the folding of the window. A zero setting unit(603) establishes the domain folding the window in zero value at the current frame. A frame extracting unit(604) extracts the frame in which the folded first window is processed. A window generating unit(605) generates the second window of the opposite value and folded window. A signal restoring unit(606) restores the former state the raw signal from frame.
Abstract:
본 발명은 오디오 부호화 및 복호화 방법과 그 장치에 관한 것으로 시간영역의 오디오 프레임을 주파수 영역으로 변환하는 주파수 변환부; 기설정한 수의 주파수 영역의 오디오 프레임에 대응하는 원본행렬을 차원축소하여 기저행렬과 가중치 행렬을 구하는 차원 축소부; 및, 상기 기저행렬을 양자화 하는 양자화부를 포함한다. 차원 축소, 오디오 복호화, 오디오 부호화
Abstract:
PURPOSE: A method and a device for quantizing an information parameter between channels to improve performance of audio channel coding are provided to supply a Huffman table corresponding to a bit quantization method and a CLD four bits quantization method when bit allocation for VSLI quantization is reduced in a low bandwidth. CONSTITUTION: A CLD quantization value generator(110) generates a quantization value which 4-bit linearly quantizes a VSLI(Virtual Source Location Information) and a CLD(Channel Level Difference) conversion value corresponding to the quantization value. The VSLI is location information of a virtual sound source. A Huffman table generating unit(120) uses the quantization value and the CLD conversion value to generate a differential Huffman table. A CLD quantization unit(130) uses the differential Huffman table to quantize a CLD.
Abstract:
An audio coding and decoding method and an apparatus thereof are provided, which improve the coding gain of the audio signal coding apparatus due to the frequency area signal expression reducing dimension. An audio coding method is as follows. The audio frame of the time domain is converted into the frequency domain if it is received. The basis matrix and weight matrix are obtained. The basis matrix is quantized. The masking curve of the original copy matrices is drawn. The masking curve of the basis matrix is drawn. By using the masking curve of the original copy matrices, the masking curve of the basis matrix is modified and is optimized.
Abstract:
A device and a method for down-mixing a multi-track by using correlation between sound sources are provided to maximally reduce mixing of other sound sources when the predetermined sound source is removed or played by user control. A signal converter(110) converts an individual sound source signal into a frequency band. A spatial information generator(120) generates spatial information between the sound sources from the respected converted sound source signals. A mixing combination determiner(130) determines mixing combination information according to a correlation value by using the spatial information. A multi-track down-mixer(140) performs down-mixing from the converted individual sound signal into a multi-track signal according to the determined mixing combination information.
Abstract:
본 발명은 양자화 잡음 처리를 위한 적용 주파수 대역 결정 방법과, 그를 이용한 양자화 잡음 처리 방법에 관한 것으로, 오디오 신호의 양자화 잡음을 적용 주파수 대역에 따라 장구간 블록을 이용하여 처리하되, 그 적용 주파수 대역을 오디오 신호의 과도 유무에 따라 구분하여 일반 주파수 대역 또는 확장된 주파수 대역으로 결정함으로써, 프리에코 및 뮤지컬 노이즈를 용이하게 줄일 수 있게 하는, 양자화 잡음 처리를 위한 적용 주파수 대역 결정 방법과, 그를 이용한 양자화 잡음 처리 방법을 제공하고자 한다. 이를 위하여, 본 발명은, 양자화 잡음 처리를 위한 적용 주파수 대역 결정 방법에 있어서, 저주파 통과 필터링된 오디오 신호가 과도한지 여부를 확인하는 과도여부 확인 단계; 상기 확인 결과, 상기 오디오 신호가 과도하지 않으면 양자화 잡음 처리를 위한 적용 주파수 대역을 기 정해진 적용 주파수 대역으로 결정하는 일반 주파수 결정 단계; 및 상기 확인 결과, 상기 오디오 신호가 과도하면 상기 적용 주파수 대역을 상기 기 정해진 적용 주파수 대역보다 확장된 적용 주파수 대역으로 결정하는 확장 주파수 결정 단계를 포함한다. TNS, 양자화 잡음, 적용 주파수 대역, 장구간 블록, 단구간 블록, 과도 신호, 프리에코, 뮤지컬 노이즈