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From: greg@walt.cc.utexas.edu (Greg Harp)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Amigas shipping with 16-bit audio?
Message-ID: <34511@ut-emx.UUCP>
Date: 26 Jul 90 05:28:40 GMT
References: <1990Jul14.173215.25433@ux1.cso.uiuc.edu> <5958@hub.ucsb.edu> <1990Jul15.215912.25094@funet.fi> <7891@lynx.UUCP> <1383@wet.UUCP> <2261@dialog.stgt.sub.org>
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Reply-To: greg@walt.cc.utexas.edu (Greg Harp)
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In article <2261@dialog.stgt.sub.org> root@dialog.stgt.sub.org (Christian Motz) writes:
>In article <1383@wet.UUCP> nut@wet.UUCP (adam tilghman) writes:
>>>>Have somebody done direct sampling from harddisk yet?
>>>
>>>
>>  There are at least two direct-to-disk sample recorders for the Atari ST,
>>and seeing that the ST and the Amiga are not too different, I would assume
>>that it is entirely possible on the Amiga.  According to several reviews and
>>ads, these samplers are able to keep up with four-channel CD-quality sound
>>(math works that out to be around 176Khz).  But you had better have a
>>_REALLY BIG_ hard disk to do any type of large-scale sampling with that
>>beast (only 400 Seconds == 6.75 minutes on a 1Gb drive!)

I'd be hard-pressed to name any, but I've heard rumors.  It should be 
possible, though.  Certainly a harddrive (non-DMA :-) could store the
info fast enough.  Anyone have bandwidth/specs handy to confirm or deny 
this?

>This is probably the reason why CD's only play 4 Minutes, is  it?  ;-)
>Uhmmm, perhaps you should re-check your math. Now  let' s  see ...  we
>have 44 kHz sampling frequency, which leaves  us  with  44000  16- Bit
>words every second. Double that, since we want to have  stereo  sound,
>right? Ok, that makes up 176000 bytes per second,  or  10560000  bytes
>per minute. That's almost exactly 10 MBytes  per  minute,  leaving  us
>with about 600  MBytes  per  hour.  Does  this  value  strike  you  as
>familiar? Surprise!!!! It's  the  average  capacity  of  the  standard
>Compact Disc ...

I'm not gonna go through the math again, but the CD audio standard 
(Phillips/Sony) provides for 75 minutes of music at 16 bits and 44.1 kHz.
Of course, lots of tracking information and even graphics data are stored
on these disks, too...

However, these are printed, read-only disks.  Anyone know what the highest
storage acheived on WORM or other writeable CD currently is?

>--
>Christian Motz                                root@dialog.stgt.sub.org

..greg...

        ___  Disclaimer:  The opinions expressed above are not my own, but
AMIGA! ////  the property of some higher-up power, to which I am only a tool.
      ////     "Welcome, my son.  Welcome to the machine." -- Pink Floyd
___  //// "Reality is only a simulation, and it's still in beta testing." -- Me
\\\\//// 
 \\XX//            Greg Harp                greg@ccwf.cc.utexas.edu