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From: tlimonce@drunivac.drew.edu
Newsgroups: comp.sys.amiga.hardware,comp.sys.amiga,comp.dsp
Subject: Re: Introducing a DSP board for the Amiga (LONG) (REPOST)
Summary: technical foul: should be 44.1 KILOHERTZ, not MHz.
Message-ID: <41185.25f1defc@drunivac.drew.edu>
Date: 5 Mar 90 03:37:32 GMT
References: <41152.25f147bf@drunivac.drew.edu>
Followup-To: comp.sys.amiga.hardware
Lines: 27

In article <41152.25f147bf@drunivac.drew.edu>, tlimonce@drunivac.drew.edu writes:
> Amiga sound stores 8-bits for every "number" when it digitizes or plays
> sound.  A CD player uses 16-bits (or 18 ...depending on how you think
> about it) per number.  A CD player plays at 44.1MHz; this means that it
                                                  ^^^--should be KHz
> records 44.1 million numbers per second!  Now you understand why a DSP
               ^^^^^^^--should be thousand
> has to be able to do fast math.  If you have an equation that will
> lower a sound 2 octaves and you want to do it in real-time; you need to
> do that equation 44.1 million times per second.
                        ^^^^^^^--should be thousand

About 5 people have mailed to me about this.  Yes, a CD samples at 
44.1KHz (KILO, not MEGA).  It even says so right here on my notes 
about the meeting.  It must be that the "K" and "M" keys are so close 
together. :-)

Computationally this makes sense.  44.1 million samples per second is
more than most computers could handle.  If a CD player could keep up
with 44.1MHz you wouldn't see many sold for $200! 

-Tom
---
Tom Limoncelli
tlimonce@drew.edu (new)    ...as seen in USA Today!
tlimonce@drew.Bitnet
limonce@pilot.njin.net