Apple TV upsampling to 48khz

Discussion in 'Apple TV and Home Theater' started by Richard8655, Dec 8, 2012.

  1. Richard8655, Dec 8, 2012
    Last edited: Dec 8, 2012

    Richard8655 macrumors 6502

    Joined:
    Mar 11, 2009
    Location:
    Chicago suburbs
    #1
    Sorry if this has been asked. I searched and could find no answer in the forum or elsewhere.

    Why does Apple TV upsample its audio from 44.1khz to 48khz? I ask because standard CD audio is at 44.1khz, and upsampling potentially impacts the original audio quality, even if almost undetectibly. Some audiophiles have noticed a difference and blame it on this.

    Airport Express keeps its audio at 44.1khz as an original CD would have. I wonder if it has to do with how the sound is packaged with video, since Apple TV's main mission is video transmission, not audio in itself.
     
  2. Pyromonkey83 macrumors 6502

    Joined:
    May 24, 2009
    #2
    A lot of receivers will only accept 48khz Dolby Digital audio (for videos only, of course) in order to recognize it as such. I know my Denon will only allow you to select the Dolby Pro Logic II setting if the audio is in 48khz. I believe the Apple TV upsamples in order to fit this restriction for video, and ends up doing the same for audio as well regardless.

    I have never looked, but you may want to check the Audio settings of the Apple TV to see if there is a setting that will allow you to change this.
     
  3. Richard8655 thread starter macrumors 6502

    Joined:
    Mar 11, 2009
    Location:
    Chicago suburbs
    #3
    Yes, thanks, the video with Dolby digital audio 48khz compatibility explanation makes sense. I didn't know this about Dolby receivers.

    Apple TV does not allow a change of settings for upsampling rate. But in the end, I doubt there's any sound degradation of 44.1khz music that's noticable even by audiophile ears.
     
  4. GilesM macrumors 6502

    Joined:
    Oct 17, 2008
    #4
    My Apple Tv has suddenly started sending at 48khz instead of 4.1 since updating to iTunes 11.00. Not sure if this is due to any changes or perhaps I did not notice it previously. Either way i am happy about it. just wish iTunes and Apple TV combination would allow the higher sampling rates my DAC can handle (96Khz).. please Apple... pretty please...
     

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