[geeks] So what is a "Frankenmac"?

Joshua D Boyd geeks at sunhelp.org
Mon Nov 26 22:56:42 CST 2001


On Mon, Nov 26, 2001 at 10:00:24PM -0500, Ken Hansen wrote:
> > Ever tried 256Kbit/s instead of 128K? I do all my stuff in 256K.
> What kind of "real" compression does that give you, 256K
> samples/second (ok, not *really* samples, but...)?

OK.  Raw uncompressed audio is (* 44500 16 2)1,424kbit/sec. 

So, when we say 256kbit/sec, that is a ratio of (/ (* 44500 32) (* 256 1024)) 
1 to 5, assuming constant bitrate (MP3 also offers variable bit rate which
is supposed to give the same quality at a higher, but variable, compression
ratio).

By comparison, just gziping the wave file gives a ratio of 
(/ 11908220 9889542) 1 to 1.2.  I'm sure there are other lossless methods that
would yield even higher compression ratios.



-- 
Joshua D. Boyd



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