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embarrasing storage question . . .
Old 26th July 2002
  #1
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embarrasing storage question . . .

you know i've been working with audio files for quite a while but never actually considered how increasing bit-depth and sampling rate effects file size. i'm %100 shure doubling sampling rate doubles file size. does increasing quantization increase file size exponetially? so going 16 to 24 bit is a 256X files size increase, doesn't seem that way?
Old 26th July 2002
  #2
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Re: embarrasing storage question . . .

Quote:
Originally posted by spandau fondue
you know i've been working with audio files for quite a while but never actually considered how increasing bit-depth and sampling rate effects file size. i'm %100 shure doubling sampling rate doubles file size. does increasing quantization increase file size exponetially? so going 16 to 24 bit is a 256X files size increase, doesn't seem that way?
For the bit rate change, I believe it's a 50% increase in size... 16bits + 8bits =24bits... you're correct however in thinking that doubling the sample rate will double the size.

billy bush
Old 26th July 2002
  #3
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i just upsampled a 16/44.1 to 24/96 it went from roughly 40 megs to 720 megs. something is different with the quantization. i guess it could be also the funky math going from 44.1 to 96 (not a even conversion like going to 88.2) also perhaps upsampling is perhaps different from recording the files initially.
Old 26th July 2002
  #4
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Quote:
Originally posted by spandau fondue
i just upsampled a 16/44.1 to 24/96 it went from roughly 40 megs to 720 megs. something is different with the quantization. i guess it could be also the funky math going from 44.1 to 96 (not a even conversion like going to 88.2) also perhaps upsampling is perhaps different from recording the files initially.
Something must be occuring with the math of the upsampling process to make the file size jump that much. I know that for the initial recording of files it works like this approximately:

Sample Rate (kHz) 44.1 48 96 192

16-Bit — MB per Min 5 5.5 11 22

24-Bit — MB per Min 7.5 8 16 32

Using this, I figure there is about 8 minutes of mono audio or 4 minutes in stereo in your file , so theoretically it should end up being approx. 128 megs at 24/96. That is if I'm understanding this correctly, of course!

What are you using to do the upsampling?

billy bush
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