Talk:Recording medium comparison

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[edit] Bitrate

bitrate = \frac {size}{time}
size = bitrate \times time
time = \frac {size}{bitrate}

Bitrate is filesize divided by playtime, and playtime is filesize divided by bitrate. Calculations for digital audio players' length were done like this:

10 GB == 1024 x 1024 x 1024 x 8 bits
      == 8589934592 bits

8589934592 /  64000 == 134217.728  seconds → 37 hours 16 minutes
8589934592 / 128000 ==  67108.864  seconds → 18 hours 38 minutes
8589934592 / 320000 ==  26843.5456 seconds →  7 hours 27 minutes

Audio bitrates usually done with 1k == 1000. --Kjoonlee 08:33, 8 July 2007 (UTC)

10 GiB actually equals 85899345920 bits (10 x 1024 x 1024 x 1024 x 8 bits). 4.242.147.41 (talk) 19:05, 20 March 2008 (UTC)
Oops. :) New numbers updated using the "GNU units" program. 372.82, 186.41, 74.56 hours. --Kjoonlee 06:53, 14 April 2008 (UTC)