Gina, noise reduction (was: RE: AW: To earth, or not to earth...)

[Mikko Helin]

>My systems isn't huge, 4 vcos, 2egs, 2vcegs, 4-2-1 mixer, dual svf/vca,
>(dual 2044 lpf and quad lfo on the workbench).
>Everything else I use produces more noise - especially my 808/909 drum
>circuits, so before I would master anything to CD, I would run it thru a
>digital noise reduction process on my PC anyway :-).
>
>On a side point here, I'm thinking of buying an Event Gina audio card
>for hd multitracking. These have 20-bit audio resolution, and the test
>in this months SOS showed they have over 90 db snr, so maybe I'll have
>to invest in some noise gates for my other gear...
>
I've got the Ensoniq AudioPCI (actually Shuttle Spacewalker HOT-255). 
This is not quite over 90 dB snr sound card, but it seems to be possible to
modify the card to use other ADC and DAC. I'm going to try Crystal's
CS4222 codec, CS4330 & CS5330 could do as well (if anybody happens
to know where to get these please tell me). With two EAPCI's synced
together and with the new drivers coming soon it's possible to get 
4 inputs and 8 outputs for under $100 (AudioPCI is $44 at 
www.carlind.com).

If the noise is problem there's another way to reduce it: the noise 
reduction system. Analog Devices new HUSH(tm owned by Rocktron) chip 
SSM2000 would be nice. I don't know much about it, but they promise 
upto 26 db better dnr (or snr or whatever). It works like an envelope 
controlled LPF, except that the envelope is not the straight amplitude 
envelope, but more like a frequence envelope (filter follows the frequency
content of the audio signal), and it's said to be very transparent, no
pumping effetcs like with the usual amplitude controlled noise gates.


-Mikko


>Colin f
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