Gina, noise reduction

[Mikko Helin]

There are datasheets on Ensoniq's www-sites semiconductors
section. According to them, there's an extra I2S input
which could be used to connect the s/pdif receiver.
I'm going to try it when I found some time, maybe
on next weekend. The software can't switch the i2s
input on, so I have to write some kind of program
to do it. I hope EAPCI driver doesn't virtualize
and restrict the control port access on ES1370.

Replacing ADC with s/pdif is more difficult, as
you need a sample rate converter between ES1370
and s/pdif receiver, ES1370 (the audioPCI controller)
has 22.4345 (?) MHz crystal, which can't be replaced
by CS8412's 256 fs master clock output (11.2xxx Mhz
for 44.1 kHz sample rate (fs)), 512 fs is needed. 
With a PLL it could be possible, I've never used PLL's, 
so I don't know.

-Mikko

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Sounds like a bargain - anyone for PCI Soundcard-DIY ?
Does the Ensoniq card support spdif i/o ? 
Would it be possible to replace the ADC on a soundcard with a Crystal
spdif receiver  ?

I believe Maplin have the SSM Hush chips - I hadn't given them much
thought, but 26 db sounds like a very effective system !
Anyone have any experience with these, or know what the best case output
snr is ?
If it can take a signal with noise at about -70db, and lower that to
-96db it would cover a multitude of sins...

Colin f