A closer look into MPEG-4 High Efficiency AAC
نویسندگان
چکیده
MPEG Spectral Band Replication (SBR) is the newest compression technology available as part of the MPEG standards. It is combined with MPEG Advanced Audio Coding (AAC) and improves coding efficiency by more than 30%. The resulting scheme is called High-Efficiency AAC (HE AAC). This presentation explains MPEG SBR and its integration into the existing MPEG-4 bitstream format. The SBR technology itself as well as the implications on systems based on MPEG-4 technology are described. Signaling through MPEG-4 Systems and other transport formats is introduced and typical applications and usage scenarios are listed.
منابع مشابه
Mpeg-4 High-efficiency Aac Coding
The name MPEG-4 High-Efficiency AAC (HE-AAC) refers to a family of recent audio coders that were developed by the ISO/IEC Moving Picture Experts Group (MPEG) by subsequent extension of the established Advanced Audio Coding (AAC) architecture. These algorithmic extensions facilitate a significant increase in coding efficiency relative to previous standards and other known systems. Thus, they pro...
متن کاملNew fast algorithms for the low delay MDCT computation in the MPEG-4 AAC enhanced low delay audio coding standard
Recently, the MPEG committee has completed the development of a new audio coding standard, the MPEG-4 Advanced Audio Coding-Enhanced Low Delay (AAC-ELD). The stateof-the-art MPEG audio coding standards, such as MPEG-4 AAC Low Complexity (AAC-LC), High Efficiency AAC (HE-AAC) and AAC Low Delay (AAC-LD), utilize for the time-tofrequency transformation of an audio block and vice versa, the well kn...
متن کاملSmartJukebox: An Efficient and High-Quality MPEG-2 AAC Encoder
*Multimedia Research Laboratories This paper describes high-quality and processor-efficient software implementation of an MPEG-2 AAC LC Profile encoder utilized in “SmartJukebox,” music jukebox software. MDCT and quantization processing are accelerated by 21.3% and 19.0%, respectively, through the use of SIMD instructions. In addition, psycho-acoustic analysis in the MDCT domain makes the use o...
متن کاملHigh-quality and processor-efficient implementation of an MPEG-2 AAC encoder
Presented here is MPEG-2 AAC LC Profile encoder software for an Intel Pentium III processor. MDCT and quantization processing are accelerated by the use of SIMD instructions. Psycho-acoustic analysis in the MDCT domain makes the use of FFTs unnecessary. Better sound quality is provided by greater efficiency in quantization processing and Huffman coding. All of this results in high-quality and p...
متن کاملMPEG-4 SLS – Lossless and Near-Lossless Audio Coding Based on MPEG-4 AAC
MPEG-4 Scalable Lossless Coding (SLS) is one of the latest extensions to the MPEG-4 audio coding standard. It provides a scalable lossless extension of the well-known MPEG4 AAC codec. The lossless enhancement is performed in a finegrain scalable way, starting from the AAC core signal in small steps all the way up to a numerically lossless representation, thus also including near-lossless compre...
متن کامل