wdao@sal49.usc.edu (Walter Dao) (03/24/89)
Hello, I have up to now, gotten from this net, 2 diagrams for 2 different
sound digitizers.
The first originated from GEnie and was graciously sent to me. (it is a really
simple circuit with very little number of components and wiring).
The second was s direct post from <forgot his name> but was called (SD0809) .
It was involving some greater amiount of components and would have involved a
lonnger building time.
now my question.
What are the differences ? Better sound quality at a lower requording rate ?
(and therefore saving some precious MEM ?)
I am asking those questions to the actual users of these beasts. How do they
compare with actual commercial samplers (future sound, perfect sound, AMAS
etc?) .
I mean, do they produce a sample with background noice like WHUP-WHUP-WHUP_ ?
or are those samples as pure as the original sound ?
yes , I plan on building one but I dont want to be disappointed and find out
that the sample made with the machine sounds like a dying cow when it should
have sounded like somebody saying "hello" .... And also a sample that has to
much "scratch" sound in the Bckgrnd is not acceptable ...)
something that sounds like what is being produced in those commercial games
would be best.
yeah, that's it ..... that's the ticket.
DW . johnhlee@cory.Berkeley.EDU (John Lee) (03/28/89)
In article <3198@nunki.usc.edu> wdao@sal49.usc.edu (Walter Dao) writes:
<Hello, I have up to now, gotten from this net, 2 diagrams for 2 different
<sound digitizers.
<The first originated from GEnie and was graciously sent to me. (it is a really
<simple circuit with very little number of components and wiring).
<The second was s direct post from <forgot his name> but was called (SD0809) .
<It was involving some greater amiount of components and would have involved a
<lonnger building time.
<
<now my question.
<What are the differences ? Better sound quality at a lower requording rate ?
<(and therefore saving some precious MEM ?)
<I am asking those questions to the actual users of these beasts. How do they
<compare with actual commercial samplers (future sound, perfect sound, AMAS
< etc?) .
I created and posted 'SD0809' because I got some inquiries about a sound
digitizer using the ADC0809 chip specifically that I had mentioned in
another article. I warned that I put in a 'kludge' in order to use the
chip, but people still wanted it anyways.
<I mean, do they produce a sample with background noice like WHUP-WHUP-WHUP_ ?
<or are those samples as pure as the original sound ?
<
<yes , I plan on building one but I dont want to be disappointed and find out
<that the sample made with the machine sounds like a dying cow when it should
<have sounded like somebody saying "hello" .... And also a sample that has to
<much "scratch" sound in the Bckgrnd is not acceptable ...)
I have my circuit built and running right now. I have digitized several
samples, and I'm quite satisfied (surprised?) with its quality. There is
no extra background noise except when the unit/input lines are unshielded,
which is to be expected. As pure as the original sound? Not if you're not
sampling fast enough.
Read the README I enclosed with the schematics. I haven't seen the
other design, but I don't recommend you build mine because:
1) It can't digitize in stereo, ala Perfect Sound.
2) I pushed the chip 2x past its rated clock spec.
3) I built it because I had the chip laying around I wanted to
see if I could make a digitizer out of it, not because I
wanted to build a good sound digitizer.
<something that sounds like what is being produced in those commercial games
<would be best.
<
< yeah, that's it ..... that's the ticket.
<
<
<
< DW .
Again, to recap, I posted the design for those who were interested in
experimenting with the ADC0809 as a sound digitizer. If you want a
good stereo sound digitizer, don't use my design. (It's fine for
a monophonic digitizer, though.) Personally, I am going to build a
stereo digitizer using different chips (ADC0804, to be exact), but I
wanted to see if I could do it with the ADC0809.
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