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What is the best way to use mono input to both ADC's
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ice-nine



Joined: 24 May 2012
Posts: 125

PostPosted: Sat Oct 17, 2015 6:14 am    Post subject: Reply with quote

I know it has been a while since I asked about if the inputs should be directly tied together or if they would be better kept separate with the signal being fed to both inputs via their own filter network. I have managed to test out both options now and find no real difference in noise when the two are directly tied together.
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Sweetalk



Joined: 15 Oct 2009
Posts: 95

PostPosted: Tue Oct 20, 2015 4:40 am    Post subject: Reply with quote

ice-nine wrote:
I know it has been a while since I asked about if the inputs should be directly tied together or if they would be better kept separate with the signal being fed to both inputs via their own filter network. I have managed to test out both options now and find no real difference in noise when the two are directly tied together.


Great!, just what I thoughted, did you tried to leave the unused open?.
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ice-nine



Joined: 24 May 2012
Posts: 125

PostPosted: Thu Oct 22, 2015 10:00 am    Post subject: Reply with quote

Sweetalk wrote:
ice-nine wrote:
I know it has been a while since I asked about if the inputs should be directly tied together or if they would be better kept separate with the signal being fed to both inputs via their own filter network. I have managed to test out both options now and find no real difference in noise when the two are directly tied together.


Great!, just what I thoughted, did you tried to leave the unused open?.


Yeah, I tried with pin 2 input open as well. the code I was using processes signal from both inputs (an echo) everything sounded just as it should apart from the fact that the right input processing was missing at the output, as expected of course.
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sandromatik



Joined: 18 May 2011
Posts: 27

PostPosted: Mon Nov 02, 2015 4:27 am    Post subject: Reply with quote

I think the best way is to work with balanced lines,
with a mono program you can use the FV1 stereo in and outs as balanced mono.
Of course your program must be adapted to receive and send balanced signals.

Since I tried this will never go back to unbalanced,
both common mode noise rejection and converters S/N are widely improved.
Especially when using an external oscillator any leak of the VCO into the audio is gone.

It's also a very cheap and straight forward improvement,
can be done with 2 op amp sections, a few resistors and 3 lines in the dsp...
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