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From: ong@d.cs.okstate.edu (ONG ENG TENG)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Analog-to-Digital Sound-to-Data pc board?
Message-ID: <1991Feb6.145754.11445@d.cs.okstate.edu>
Date: 6 Feb 91 14:57:54 GMT
References: <15917@milton.u.washington.edu>
Organization: Oklahoma State University
Lines: 19

From article <15917@milton.u.washington.edu>, by siemion@milton.u.washington.edu (John Siemion):
> 
> 
> 
> Hello...
> 
> Do you know of any pc boards that convert analog (eg sound) signals to 
> digital format?  I would like to use one of these (if they exist) to
> record sounds and to have the frequency data directed to a digital format
> in some kind of data file (hopefully convertible to something like 123.)

The Sound Blaster has a digital sampling 8-bit analog input.  To record
voice, you only have to buy a regular microphone with -70 dB or better
(i.e. -69, -68,...).  It samples from 4kHz to 12kHz.  If you want lower
frequency, simply ignore those in between.  Example to get 1kHz sampling
rate data simply sample at 4kHz and use only 1 value out of each 4.
The card comes with both menu-driven and line-command programs to
record voice.  The voice file generated has a 32-byte header followed
by the data in raw format.