Have you guys noticed compression on itunes/ipod?
Old 10th April 2010
  #1
Gear maniac
 

Thread Starter
Have you guys noticed compression on itunes/ipod?

Heya, how's it going?

There's a lecturer at school who reckons he can hear compression added to tracks playing from itunes or from an ipod even when the mysterious "sound enhancement" is switched off.

Opinions?

(This is close to a "do different DAW's" null or not, but I swear it isn't.)
Old 10th April 2010
  #2
Gear nut
 

Did he specify what he meant by 'compression?' Because I definitely hear lossy data compression...
Old 10th April 2010
  #3
Lives for gear
 
DistortingJack's Avatar
 

I hear a graininess coming from iTunes compared to other apps (notably iZotope RX) which I attribute either to complete delusion or something to do with a lo-pass filter, but the feeling of compression from an ipod just comes from a shitty headphone amp, really ; )
Old 10th April 2010
  #4
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Realziment's Avatar
 

are saying as opposed to other mp3 format sites, or as opposed to cd?
Old 10th April 2010
  #5
I have A/B'd AIFF, AAC, 320k MP3, and 128k MP3 of the same songs in a control room and heard subtle differences among them.

Individually nulling out the left and right channels of AIFF and the other files produces substantial difference signals, i.e. compression artifacts.
Old 11th April 2010
  #6
Gear maniac
 

Thread Starter
Cheers dudes-of-sound, interesting replies.

He was talking about comparing the same file played in ProTools to the same file played in itunes.
Old 11th April 2010
  #7
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valis's Avatar
In what format though? Broadcast wav/aiff playback in both? Listening to the same mp3 or mp4/aac through both platforms? (which I don't think Protools can do btw without decoding the audio...)
Old 12th April 2010
  #8
Gear maniac
 

Thread Starter
Ohhh.... I don't know. What mysterious processes could be involved in different formats?
Old 12th April 2010
  #9
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valis's Avatar
Well comparing 48khz/24bit (or 44.khz/24bit etc) to 128-192k AAC (itunes compressed) is certainly going to show differences...
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