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From: KFL%MX.LCS.MIT.EDU@MC.LCS.MIT.EDU.UUCP
Newsgroups: mod.computers.vax
Subject: Re: A/D and D/A equipment for MicroVAX
Message-ID: <[MX.LCS.MIT.EDU].932926.860713.KFL>
Date: Sun, 13-Jul-86 13:20:14 EDT
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Posted: Sun Jul 13 13:20:14 1986
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    From: cetron%utah-cbd@utah-cs.arpa (Ed Cetron)

    	As i recall, 8khz is very slow compared to the speeds that i recal
    seeing - upwards of 25khz I think.....

  It depends on what you are doing.  8 khz is too slow to digitize
voice or music.  You can only work with frequencies up to half the
sampling rate.  In practice, somewhat less.
  We have a 50 khz A/D and D/A board on an PC-DOS machine.  We used to
have a 40khz A/D board on a CP/M machine.  Either is sufficient for
audio signals.
  Video digitization requires several Mhz.  Seismic studies may require
only 10 hz.  Real time control may require anywhere from 1 hz to 1 Mhz.
The sampling rate you should choose depends entirely on what you want
to use it for.
								...Keith