![]() ![]() ![]() It is also one of the audio formats used on Spotify. The idea was to achieve a small file size with better sound quality. Blind tests in the late 1990s showed that AAC demonstrated greater sound quality and transparency than MP3 for files coded at the same bit rate. ![]() AAC is also supported by manufacturers of in-dash car audio systems. This format was originally created as an alternative to mp3. Advanced Audio Coding is designed to be the successor of the MPEG-1 Audio Layer 3, known as MP3 format, which was specified by ISO / IEC in 11172-3 ( MPEG-1 Audio) and 13818-3 ( MPEG-2 Audio). It is supported on PlayStation Vita, Wii, Sony Walkman MP3, Android and BlackBerry. AAC uses only a modified discrete cosine transform (MDCT) algorithm, giving it higher compression efficiency than MP3, which uses a hybrid coding algorithm that is part MDCT and part FFT.ĪAC is the default or standard audio format for iPhone, iPod, iPad, Nintendo DSi, Nintendo 3DS, Apple Music, iTunes, DivX Plus Web Player, PlayStation 4 and various Nokia Series 40 phones. Tests of MPEG-4 audio have shown that AAC meets the requirements referred to as "transparent" for the ITU at 128 kbit/s for stereo, and 320 kbit/s for 5.1 audio. The quality for stereo is satisfactory to modest requirements at 96 kbit/s in joint stereo mode however, hi-fi transparency demands data rates of at least 128 kbit/s (VBR). Part of AAC, HE-AAC ("AAC+"), is part of MPEG-4 Audio and is adopted into digital radio standards DAB+ and Digital Radio Mondiale, and mobile television standards DVB-H and ATSC-M/H.ĪAC supports inclusion of 48 full-bandwidth (up to 96 kHz) audio channels in one stream plus 16 low frequency effects (LFE, limited to 120 Hz) channels, up to 16 "coupling" or dialog channels, and up to 16 data streams. Designed to be the successor of the MP3 format, AAC generally achieved higher sound quality than 20th century MP3 encoders at the same bit rate.ĪAC has been standardized by ISO and IEC as part of the MPEG-2 and MPEG-4 specifications. See aacPlus, Apple Lossless, MP3 and iPod.Answer: What is Advanced Audio Codec mean?Īdvanced Audio Coding ( AAC) is an audio coding standard for lossy digital audio compression. Designed to be able to provide more compression with higher audio fidelity than MP3, AAC has become a popular choice, and is the standard format for audio in many types of media, including Blu-Ray. Long Term Prediction was added in MPEG-4 to improve the Main profile. The Advanced Audio Coding (AAC) codec is defined as part of the MPEG-4 (H.264) standard specifically, as part of MPEG-4 Part 3 and MPEG-2 Part 7. Low Complexity (LC) is lower quality, but uses less CPU processing, and Scalable Sampling Rate (SSR) is a variation of LC. The Main profile offers the highest quality. iTunes allows users to rip their CDs to AAC as well as MP3.ĪAC is available in profiles, which determine how the algorithms encode the audio data. It was designed to be the successor to MP3 and claims to offer better. AAC has been standardized by ISO and IEC as part of the MPEG-2 and MPEG-4 specifications. Designed to be the successor of the MP3 format, AAC generally achieves higher sound quality than MP3 encoders at the same bit rate. Songs purchased from the iTunes online store were sold with AAC copy protection, but Apple dropped the protection in 2009 (see FairPlay). AAC stands for Advanced Audio Codec, and is an audio coding standard used to compress and encode digital audio files. Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. ![]() AAC, especially MPEG-4 AAC, provides greater compression and better sound quality than MP3, which is also part of the MPEG standard.ĪAC was chosen as the default format for Apple's iPod because of its sound quality and copy protection, which was administered through Apple's iTunes software. AAC (Advanced Audio Coding) and MP3 (MPEG-1 Audio Layer 3) are lossy formats for audio files. This article is provided by FOLDOC - Free Online Dictionary of Computing ( ) AAC( Advanced Audio Coding) An audio compression technology that is part of the MPEG-2 and MPEG-4 standards. ![]()
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