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  • Resampling?

    From TimS@21:1/5 to All on Sat Jul 27 18:31:41 2024
    I hooked up my 2017 Air running Monterey, to my Quad amp via an A/B USB cable, selected the amp in Sound -> Output, and played a .mp3 happily through the
    amp. Now, the amp expects 44.1kHz - which is what the mp3 gives as its sammpling rate. So far so good. But under what circs might the sampling rate
    be different? And if there is a difference how is that handles? Negotiation? Resampling?

    --
    Tim

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  • From Ian McCall@21:1/5 to TimS on Thu Aug 1 17:26:35 2024
    On 27 Jul 2024, TimS wrote
    (in article <lgksodF93ltU1@mid.individual.net>):

    I hooked up my 2017 Air running Monterey, to my Quad amp via an A/B USB cable,
    selected the amp in Sound -> Output, and played a .mp3 happily through the amp. Now, the amp expects 44.1kHz - which is what the mp3 gives as its sammpling rate. So far so good. But under what circs might the sampling rate be different? And if there is a difference how is that handles? Negotiation? Resampling?

    You can get all sorts, depending what quality was gone for. Mostly an amp
    will handle it, but you do sometimes get cut-outs. 96kHz is an obvious one,
    but you can also get 192kHz. It depends what you’re trying to do -
    mastering etc. will often be at the higher rates, but then transposed to a different one for playback.

    You can hit compatibility issues if amps can’t handle downsampling, so
    it’s a mixed bag. The obvious difference is bandwidth - a 44.1kHz sample takes a lot less than a 96kHz, which in turn is less than 192 etc..

    Cheers,
    Ian

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From TimS@21:1/5 to Ian McCall on Thu Aug 1 17:49:33 2024
    On 1 Aug 2024 at 17:26:35 BST, "Ian McCall" <ian@eruvia.org> wrote:

    On 27 Jul 2024, TimS wrote
    (in article <lgksodF93ltU1@mid.individual.net>):

    I hooked up my 2017 Air running Monterey, to my Quad amp via an A/B USB cable,
    selected the amp in Sound -> Output, and played a .mp3 happily through the >> amp. Now, the amp expects 44.1kHz - which is what the mp3 gives as its
    sammpling rate. So far so good. But under what circs might the sampling rate >> be different? And if there is a difference how is that handles? Negotiation? >> Resampling?

    You can get all sorts, depending what quality was gone for. Mostly an amp will handle it, but you do sometimes get cut-outs. 96kHz is an obvious one, but you can also get 192kHz. It depends what you’re trying to do - mastering etc. will often be at the higher rates, but then transposed to a different one for playback.

    You can hit compatibility issues if amps can’t handle downsampling, so it’s a mixed bag. The obvious difference is bandwidth - a 44.1kHz sample takes a lot less than a 96kHz, which in turn is less than 192 etc.

    How would such an incompatibility manifest itself? Is there a negotiation on bitrate before playback starts, so that the app (seems to be Music.app) would just tell me it can't play that. Or do I just get garbage out of the speakers. I'm just playing the odd bit of stuff here and there, not going into the music business.

    --
    Tim

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Ian McCall@21:1/5 to TimS on Wed Aug 7 21:20:17 2024
    On 1 Aug 2024, TimS wrote
    (in article <lh205dF8uuhU1@mid.individual.net>):

    On 1 Aug 2024 at 17:26:35 BST, "Ian McCall"<ian@eruvia.org> wrote:

    How would such an incompatibility manifest itself? Is there a negotiation on bitrate before playback starts, so that the app (seems to be Music.app) would just tell me it can't play that. Or do I just get garbage out of the speakers.
    I'm just playing the odd bit of stuff here and there, not going into the music
    business.

    Garbage, or even nothing. Usually garbage though.

    Cheers,
    Ian

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