What's the meaning of "sample rate" in MP3/Vorbis/AAC?, Considering the audio was transformed |
What's the meaning of "sample rate" in MP3/Vorbis/AAC?, Considering the audio was transformed |
 Oct 7 2012, 03:44
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#1
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 Group: Members Posts: 89 Joined: 3-November 04 Member No.: 17971  |
What's the meaning of "sample rate" in MP3/Vorbis/AAC? Wouldn't it be meaningless after transform, same as bit depth?
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Oct 7 2012, 19:57
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#2
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Group: Members Posts: 107 Joined: 21-May 05 Member No.: 22191 |
I still think you're wrong here. Once you've taken a DCT and have stuff represented as a sum of sinusoids you can sample those sinusoids at any intervals, even at nonuniform sampling points. You just can't use the efficiency of the IDCT to do so, so it'll be computationally inefficient.
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sheh What's the meaning of "sample rate" in MP3/Vorbis/AAC? Oct 7 2012, 03:44
saratoga No, the transform occurs on sampled data and so th... Oct 7 2012, 05:05
sheh I guess the way I put it does seem like a retread.... Oct 9 2012, 05:21 saratoga QUOTE (sheh @ Oct 9 2012, 00:21) Benski s... Oct 9 2012, 19:03 pdq Still. since the data are stored as frequencies an... Oct 7 2012, 14:23 [JAZ] When we say that lossy streams don't have a st... Oct 7 2012, 14:44 jensend I'm not intimately acquainted with the details... Oct 7 2012, 16:46 benski fs is part of the MDCT equation. If you didn... Oct 7 2012, 18:32 sheh Okay, so the original fs needs to be plugged in so... Oct 8 2012, 18:33 lvqcl Winamp MP3 decoder still have Full/Half/Quarter qu... Oct 7 2012, 18:56 benski QUOTE (lvqcl @ Oct 7 2012, 13:56) Winamp ... Oct 10 2012, 16:16 saratoga Using a dct means you could easily drop the sample... Oct 7 2012, 19:00 saratoga QUOTE (sheh @ Oct 8 2012, 13:33) Okay, so... Oct 8 2012, 23:41 saratoga QUOTE (jensend @ Oct 7 2012, 14:57) I sti... Oct 7 2012, 20:16 Dynamic I think one problem is that we're never doing ... Oct 8 2012, 23:04 [JAZ] Mmm.. the tranformation that (most) lossy codecs d... Oct 9 2012, 19:03 Dynamic QUOTE ([JAZ] @ Oct 9 2012, 19:03)... Oct 9 2012, 22:22 pdq So am I understanding correctly that 99.9% of deco... Oct 10 2012, 17:12 saratoga QUOTE (benski @ Oct 10 2012, 11:16) QUOTE... Oct 10 2012, 17:30 [JAZ] QUOTE (Dynamic @ Oct 9 2012, 23:22) As [J... Oct 10 2012, 17:52 saratoga QUOTE ([JAZ] @ Oct 10 2012, 12:52... Oct 10 2012, 18:20 [JAZ] Winamp with the in-house decoder (i.e. not the fra... Oct 10 2012, 18:41 saratoga QUOTE ([JAZ] @ Oct 10 2012, 13:41... Oct 10 2012, 18:55 Dynamic My recollection is that Winamp 1.7 running under W... Oct 11 2012, 16:14 sheh So sample rate matters. I suppose without being fa... Oct 11 2012, 23:20 |
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