Newsgroups: comp.speech
Path: pavo.csi.cam.ac.uk!pipex!uunet!mcsun!sun4nl!tnofel!jsgn3
From: jsgn3@fel.tno.nl (Jos Groot)
Subject: ADDA10.ZIP - AD/DA board design for PC's
Message-ID: <1992Oct2.164714.3268@fel.tno.nl>
Summary: Announcement of archive with design for PC AD/DA board
Keywords: dsp,sound effects,ad,da,guitar,pc
Organization: TNO Physics and Electronics Laboratory
Date: Fri, 2 Oct 1992 16:47:14 GMT
Lines: 37

Maybe the next announcement I posted a week ago on alt.guitar,
comp.music,sci.electronics and comp.dsp is also of some interest to
the comp.speech readers:

------------------------

In reaction to requests of some people for details about the analog I/O
board I built for a PC, I recently uploaded the ADDA10.ZIP archive 
(directory <MSDOS.SOUND>) to the SIMTEL anonymous FTP site (address
WSMR-SIMTEL20.ARMY.MIL, 192.88.110.20):

<MSDOS.SOUND>
ADDA10.ZIP      ADC/DAC board for DSP experiments;TP src/exe

The archive describes how to build and use a simple low cost analog I/O 
extension board for PC's. It utilizes the 8-bit AD7569 IC containing a
500 KHz analog-to-digital converter (ADC) and a 1 MHz digital-to-analog
converter (DAC). The card can for example be used to sample sound
with the ADC and play it back through the DAC in real time, possibly after 
some `on-the-fly' digital signal processing. Files included are:

1. construction/operation description
2. electronic/layout sketch diagrams
3. Turbo Pascal 6.0 source and executable code for using the card. It includes
   routines implementing two digital (guitar) sound effects, i.e., a distortion
   and echo. These routines demonstrate the basics of the digital sound 
   processing techniques used in dedicated sound effect processors.

The files of 1. and 2. are suitable for downloading to HP Laserjet or 
PostScript compatible printers.


-- 
Jos Groot (jos.groot@fel.tno.nl)
Physics and Electronics Laboratory TNO-FEL 
P.O.box 96864
2509 JG  The Hague, The Netherlands
