Advanced Audio Coding (AAC) is a standardized, lossy compression and encoding scheme for digital audio. Designed to be the successor of the MP3 format, AAC generally achieves better sound quality than MP3 at similar bit rates. >> Read more: AAC vs. MP3
AAC has been standardized by ISO and IEC, as part of the MPEG-2 and MPEG-4 specifications. The MPEG-2 standard contains several audio coding methods, including the MP3 coding scheme. AAC is able to include 48 full-bandwidth (up to 96 kHz) audio channels in one stream plus 16 low frequency effects channels, up to 16 "coupling" or dialog channels, and up to 16 data streams. The quality for stereo is satisfactory to modest requirements at 96 kbps in joint stereo mode; however, hi-fi transparency demands data rates of at least 128 kbps (VBR). The MPEG-2 audio tests showed that AAC meets the requirements referred to as "transparent" for the ITU at 128 kbps for stereo, and 320 kbps for 5.1 audio.
AAC is the default or standard audio format for Apple's iPhone, iPod, iPad, iTunes, Sony's PlayStation 3 and YouTube. Also, it is supported by Nokia/Windows Phone, Android, Sony Walkman, Sony's PlayStation Portable, Nintendo's Wii, HDTV, Apple TV, DVB and more.
The MPEG-4 audio standard does not define a single or small set of highly efficient compression schemes but rather a complex toolbox to perform a wide range of operations from low bitrate speech coding to high-quality audio coding and music synthesis.
The MPEG-4 audio coding algorithm family spans the range from low bitrate speech encoding (down to 2 kbps)to high-quality audio coding(at 64 kbps per channel and higher).
AAC offers sampling frequencies between 8 kHz and 96 kHz and any number of channels between 1 and 48. In contrast to MP3's hybrid filter bank, AAC uses the modified discrete cosine transform (MDCT) together with the increased window lengths of 1024 or 960 points.
WinX DVD Ripper Platinum is powerful DVD ripping software that can help rip DVD to popular digital formats, either video formats or audio formats, AAC, MP3 and AC3 indluded. The big feature of this DVD ripper is its DVD copy protection decryption tech, which is able to remove DVD CSS, DVD Region Code Enhanced, Sony ArccOS, UOPs, APS and even Disney X-project DRM with ease.
Steps: Launch DVD ripper -> Input source DVD to it -> Choose AAC at "to Music" category as the output format -> Hit RUN to start fast DVD to AAC ripping process.
VideoProc can convert MP4, MOV, WMV, MKV and more SD/HD video to AAC, as well as MP3, WAV etc. at the world's fastest transcoding speed without quality loss thanks to built-in hardware encorder.
Steps: Launch video converter -> Drag source video to it -> Choose AAC at "to Music" category as the output format -> Hit RUN to start fast video to AAC conversion task.
Arlene Cooper is a self-motivated copywriter and editor in Digiarty Software, specializing in writing, proofreading and digging out inscrutable technology knowledge.