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AAC File

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Advanced Audio Compression (AAC), of which are different types:

LC (low complexity), HE (high efficiency) to name a few.

To encode your audio to be compatible with most audio players, use the LC compression type.

High Efficiency (HE AAC) uses SBR technology (not too different as mp3PRO) .

if the player knows about HE the extra frequency information can be decoded, otherwise half the audio quality will be missing on playback.

A newer standard again for ultra low bitrates is AAC+ or AAC HE v2, this uses parametric stereo for even lower bitrates.

form:http://www.dbpoweramp.com/codec-central-m4a.htm

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