Convert AAC to MP3
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Advanced Audio Coding
| File extension | .aac |
| File category | audio |
| Description | A proprietary format with lossy compression, which have been created as an alternative for MP3 with a higher quality of coding. Overtones out of human perception are being removed. AAC is two times less than MP3, which means 1/10 of CD digital data. The format has being widely used since 1997 as the seventh release of MPEG-2 family. As it is supplied by hardware players, the format is highly demanded by music fans. It has been widely spread in Apple production and is being used by default in iTunes. |
| Technical details | The format conception is similar to MP3, but it is more advanced. Being able to execute larger compression, it is represented as a separate segment of MPEG-4 standard which is used for creation of compact audio files. AAC is highly efficient with variable and continuous bitrate, with sampling frequency of 8-96 KHz. The current version complies with the standard of ISO/IEC 14496-3. Compression is performed on the basis of auditory masking effect that provides with data reduction with no deterioration for sound quality. |
| Programs |
Microsoft Windows Media Player
VLC media player
MPlayer
Foobar2000
Winamp
Apple iTunes
Audacity
|
| Developer | Bell Labs, Dolby Laboratories, Sony, Nokia, Coding Technologies |
| MIME type |
audio/aac
audio/aacp
audio/3gpp
audio/3gpp2
audio/mp4
audio/mp4a-latm
audio/mpeg4-generic
audio/x-aac
audio/x-m4a
audio/x-m4p
audio/x-m4b
audio/mp4a
audio/mpga
|
MP3 Audio File
| File extension | .mp3 |
| File category | audio |
| Description | MP3 (formally MPEG-1 Audio Layer-3 or MPEG-2 Audio Layer-3) is a digital format for storage of audio files as well as for audio streaming. The format was designed by MPEG programmers. It is one of the most required codecs for digital coding. The format is widely used in various file-sharing sites for evaluation downloading. Due to lossy compression in this audio format, it is possible to compress CD tracks up to 1/10 of their original size while maintaining high playback quality. Moreover, it can be encoded at higher or lower bit rates to adjust the resulting quality. Overtones, which cannot be perceived by a human ear, are removed. Complex algorithms allow for smaller size of tracks. As a result, one compact disk can contain several hundred songs. MP3 is compatible with all most popular operating systems and supported by the most of modern DVD-players and music systems. |
| Technical details | Prior to MP3 introduction, MPEG-1 had been widely used. That format contained not only audio data, but images as well. MP3 breaks an audio file into parts of the same length. When the processing is over, each part is packed into its own frame. It involves the technology of spectral limit that requires a continuous input signal to provide the use of two adjacent frames. When spectral deleting is over, the file is to be compressed with mathematic methods. If necessary, compression rate can be changed, even inside the same frame. Files of 128 kbit/s have 11-fold compression. Further reduction of the file size will lead to significant deterioration in sound quality. |
| Programs |
Microsoft Windows Media Player
VLC media player
MPlayer
jetAudio
Zune
Audacity
Apple iTunes
Plex Media Center
Amarok
Xine
Totem
|
| Developer | Moving Picture Experts Group |
| MIME type |
audio/mp3
audio/mpeg3
audio/mpg
audio/mpeg
audio/x-mpeg
audio/x-mpeg-3
audio/mp3
audio/x-mpegaudio
audio/x-mpg
audio/x-mp3
|