Just for the record (pardon the pun), uncompressed cd-quality audio takes up about 10 megs per stereo minute*
*44100 samples per second times 16 bits per sample equals 705600 bits per second. 705600 bits per second divided by 8 equals 88200 bytes, which rounds up to 9 megabytes.
Russell replied:
But 88200 bytes per second is only 5.3Mb/min. I always thought 44100 was for both channels - is it 44100 per channel? That would give 10Mb per minute....
Ahem... yes, I knew there was a flaw in my math somewhere, but as I was trying to figure out what I missed, I kept getting interrupted by work (pesky job ;-) and so I decided just to send it. I figured someone would show me the error of my ways. 88200 bytes per second times 60 seconds in a minute is 529200 bytes per minute, or roughly 5.3 Mb/min as you pointed out. And yes, that's 44100 per channel, so that at the highest frequency a normal cd can carry (22050 Hz), there are at least 2 samples for that frequency (in other words, as frequency approaches 22050 on a cd, the sound comes out more and more like a square wave). Multiply that by 2 channels (left and right) and you get 10.6 Mb/min which is slightly over, not under the rough number I originally quoted.
I knew when I typed that it was under something didn't sound right. (my electronic music classes were too long ago...)
At any rate, it's still a phenominal lot of uncompressed music that an iPod can carry. Compressed, it boggles the mind.
Reggie Bautista
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