Miata Mailing List: February 1996, Message #58
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   From: Keith Tanner 
Subject: Re: 10 megabytes????
   Date: Fri, 2 Feb 1996 08:21:39 -0500

>>Just to throw in a data point, one minute of CD audio takes about 10 Mb of
>>storage. Thus your 5 second buffer needs to be about 800 Kb.
>
>Hmm, I'm a little skeptical on those numbers. Maybe I'm not remembering my
>sample rates to data space conversion, but I am pretty sure that (with modern
>compression routines) 1 minute <> 10Mb, so 5 seconds <> 800Kb. After all, if
>your numbers are right, how can a DiscMan provide a *10* second buffer on a
>portable unit?

RAM's not exactly big, physically.  The 10Mb/min is a general rule of thumb
- sampled at 44.1 kHz, 16 bit, in stereo.  Another way to look at it is that
a CD-ROM can carry around 640 Mb, and as an audio CD, it'll hold about 72
minutes (this can be increased by decreasing the space between the tracks,
but that's cheating) .  It's not exactly 10 Mb/min, but that's a handy round
number.  This does not use the compression techniques used in MiniDisc
players, by the way - the full spectrum of sound remains.  

To double-check for you, I just sampled a full minute of audio at CD
quality, and it came to 10,4221.1 Kb for 60.50 seconds.  There's your 10 Mb/min.

Keith Tanner and Baby, who has to carry Keith's multimedia authoring gear
around....

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