Abstract:
An apparatus and a method for encoding/decoding a video by using separation of amplitude and sign of a differential signal are provided to take an absolute value for a differential signal generated after motion prediction, thereby improving the correlation of pixels within a block where DCT(Discrete Cosine Transform) will be performed and accordingly increasing compression efficiency. A video prediction unit generates a prediction video with respect to an original video as an object for current encoding. A differential signal generating unit generates a differential signal between the original video and the prediction video. An amplitude/sign separating unit generates a sign bit(sign bit for compensation) for performing restoring of the differential signal and amplitude from the differential signal. An encoding unit performs transform encoding, quantization and entropy encoding with respect to the differential signal amplitude, and performs entropy encoding of the sign bit for compensation. A decoding unit performs inverse-transform of the differential signal amplitude, transform-encoded and quantized in the encoding unit, so as to perform restore into the original differential signal. By performing sign compensation by using the sign bit for compensation and performing motion compensation for the sign-compensated differential signal, the decoding unit restores the original video and stores the restored original video as a new reference video.
Abstract:
MDCT 기반의 코더와 이종의 코더 간 변환에서의 인코딩 장치 및 디코딩 장치가 개시된다. 인코딩 장치는 MDCT 기반의 코더와 이종의 코더 간 변환이 발생할 때, MDCT 기반의 코딩 방식에 따라 인코딩된 입력 신호를 복원하기 위해 부가 정보를 코딩할 수 있다. 인코딩 장치에 의하면, 불필요한 비트 스트림의 생성을 방지하는 한편, 최소한의 부가 정보를 인코딩할 수 있다.
Abstract:
모드스위칭에기초하여윈도우시퀀스를처리하는통합음성/오디오부/복호화기가개시된다. 통합음성/오디오부/복호화기는모드스위칭이발생하는경우, 폴딩포인트를기준으로프레임간 오버랩을수행하여부호화하거나또는복호화할수 있다. 통합음성/오디오부/복호화기는부호화또는복호화를수행하기위해상황에따라다른윈도우시퀀스를처리함으로써, 코딩성능을향상시킬수 있다.
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.