Normalize Audio Formats (MP3-AAC-M4A-FLAC-OGG,etc)
There are three major groups of audio file formats:
Uncompressed audio formats such as WAV, AIFF or AU
Lossless (compressed audio format without loss) as FLAC, MIDI, MPEG-4 SLS, MPEG-4 ALS, MPEG-4 DST, WavPack, Shorten, TTA, ATRAC, Apple Lossless and WMA Lossless
Lossy formats (lossy compression algorithm) as MP3, Vorbis, Musepack, AAC and WMA
Uncompressed audio formats
There is a primary format uncompressed PCM, which is normally archived as. Wav in windows and. Aiff in MAC.
The first group refers to audio formats containing the “original” without any compression. Not suitable for file sharing or for use in portable devices (invcluso to store them in the computer) by the large amount of space used. A song in mp3 occupies 3 or 4 megs in Wav easily occupies 50 0 60 megs.
Compressed audio formats with Loss
This led to develop compression formats, initially found no other option to discard any information.
For example, broken mp3 format information that our ears can not perceive or redundant information, thus achieves much compressed file without ear barely notice it.
Compressed audio formats without loss
The lossless format requires more processing time than uncompressed formats but instead more efficient and takes up much less space on the hard disk. The uncompressed audio formats encode both audio silence with the same number of bits per unit time that a recording in WAV for example, takes 44,100 samples per second, regardless of whether it’s silent or sound or noise exists . This means that if we record an uncompressed file with silence occupy exactly the same space as situviese music. However in these files with lossless compression music file occupies a slightly smaller than uncompressed files and silence has come to this. This is achieved by significantly reducing the size of archvio, but as what is basically discarded silencvio, there is no loss.
Some of the most famous and important formats:
-FLAC (free lossless audio codec) a lossless compression codec.
-OGG: An archive of open source format that supports a variety of codecs, of which the most popular is the audio codec Vorbis. Vorbis offers compression similar to MP3 but is less popular.
WAV-format audio file container used mainly in Windows. Commonly used to store files uncompressed CD quality, which means they can be large, about 10 MB per minute. Wav files can also contain data encoded by a variety of lossy format to reduce the file size (eg mp3 or GSM codecs. Wav files use a RIFF structure.
MP3 MPEG Layer-3 is the most popular for downloading and storing music. Removing portions of the file that are less audible, mp3 compressed to about one-tenth of a PCM file sacrificing quality.
-AAC (Advanced Audio Coding) format is based on MPEG2 and MPEG4. The files are typically acc ADTs or ADIF containers.
-M4A A version of ACC M4A mp4 developed by Apple with digital rights management for downloads using the iTunes store
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