armhold@topaz.rutgers.edu (George Armhold) (03/22/89)
Has anyone out there built the PD Audio digitizer? I just spent 2 days
getting mine together and I'm a little disapointed in the quality of
sound it records. I suspect perhaps my long phono plug (4 feet) to the
stereo might be a source of noise. Has anyone come up with a solution
to this problem? The darn thing is so sensitive! Even when I wave my
arm near it it freaks out! Any suggestions welcome...
-George
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armhold@topaz.rutgers.edu| "If I go insane, please don't put you wires
| | | | in my brain." - R. Waters
(me) | (school) | | |
(machine) | (OB quote) (someone else)
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(NEW and IMPROVED signature, with object identifiers.)po87553@tut.fi (Ojala Pasi Juhani) (03/22/89)
I think you use a little wrong kind of wire.. It SHOULD always (??) be coaxial cables , when you transfer low-level signals. Othervise the cable catches all that noise generated by other devices (60Hz or 50Hz, isn't it!!?). If shielded cable doesn't work, jump on it!! :-) -- +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + Pasi Ojala + Pasbox , Finland (31)-710024 21-06 + + po87553@tut.fi + V.21/22 8n1 Petnet node 2 + +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
wdao@castor.usc.edu (Walter Dao) (04/07/89)
After much care, I finally succeeded into building the pd sound digitizer which
used the ADC 0804 (the genie pd piece of hardware).
I also adapted it to have it work on my c-64 . (just a pin adapter nothing
electronic).
well, it is not a very good piece of hardware. too much noise is in a sample
and I took great care into building it.
comparatively, I sent the upper 4 bits to the c-64 to see if it was really
good and could be used on a c64. Yes it works. but still the same problem.
I have a c64 digitizer that does a better job. (with some pin modification)
I could make it work on my amiga but still it would only be 4-bit resolution.
SO , the digitizer was a B I G disapointment.
Yes, it does work, but the sampled sound sounds like an old 1920 scratched
disk that survived the blitz on london during WW2.
Well, I couldnt expect some miracle from a pd hardware project.
(unless there are some improvements, like some well place filters or something
in those waters.).
DWGregM@cup.portal.com (Greg Scott Miller) (04/08/89)
>After much care, I finally succeeded into building the pd sound digitizer which >used the ADC 0804 (the genie pd piece of hardware). >I also adapted it to have it work on my c-64 . (just a pin adapter nothing >electronic). >well, it is not a very good piece of hardware. too much noise is in a sample >and I took great care into building it. >Yes, it does work, but the sampled sound sounds like an old 1920 scratched >disk that survived the blitz on london during WW2. I put the gadget together, and it works wonderfully for me - I don't have the horrid static that so many people seem to be complaining about. Maybe I'm just lucky. - Greg
rsilvers@hawk.ulowell.edu (Robert Silvers) (04/08/89)
In article <3415@nunki.usc.edu> wdao@castor.usc.edu (Walter Dao) writes: >After much care, I finally succeeded into building the pd sound digitizer which >used the ADC 0804 (the genie pd piece of hardware). >well, it is not a very good piece of hardware. too much noise is in a sample >and I took great care into building it. >SO , the digitizer was a B I G disapointment. >Yes, it does work, but the sampled sound sounds like an old 1920 scratched >disk that survived the blitz on london during WW2. >Well, I couldnt expect some miracle from a pd hardware project. > DW I also built the PD digitizer, as did someone else here at school. It seems that the amount of noise depends highly on how it is constructed. My friends first attempt had a lot of noise, but then he moved it from a plastic case to a metal one, and it got much better. I built mine in a plastic case. There is a little noise, but it is not much of a problem. I have heard PerfectSound commercial digitizers that had more noise. I would have to say, that if properly constructed, it is as good as the < $100.00 commercial units. Just make sure that it is well grounded and well shielded. --Rob. Robert Silvers. I'm the NRA. Box #1003 University of Lowell. Lowell Ma, 01854 (508) 452-5000 x2233
jwright@atanasoff.cs.iastate.edu (Jim Wright) (04/08/89)
In article <3415@nunki.usc.edu> wdao@castor.usc.edu (Walter Dao) writes: | SO , the digitizer was a B I G disapointment. | Yes, it does work, but the sampled sound sounds like an old 1920 scratched | disk that survived the blitz on london during WW2. I've built a couple of these, making changes and trying to figure out how to get it to work well. I had a wave generator hooked up providing a clean stable sine wave, and a scope to poke around inside the bugger. I turns out that the noise is generated only when the Amiga is monitoring the device. My guess is that the ACK-type signals sent into the 0804 ADC are the source of the noise. Unfortunately, the equipment here is all Fred Flintstone Signature Series stuff (i.e. old). Add that to the fact that I'm a software kinda guy, and I'm lost. Anybody have better results? -- Jim Wright jwright@atanasoff.cs.iastate.edu