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Old 16th May 2005, 07:03 PM   #11
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The schematics:

The middle one is the passive filter, with the balanced resistor values lumped to one side to avoid differential probing.

The lower one is the input circuitry of the DCX; this is interesting, since it has a kind of pre-emphasis; it has a high pass characteristic. Curves to follow.

Jan Didden
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File Type: pdf dcx output schem.pdf (24.9 KB, 74 views)
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Old 16th May 2005, 07:06 PM   #12
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Input pre-emphasis (analog inputs):
Far from level...

Jan Didden
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Old 17th May 2005, 03:11 PM   #13
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Jan, If I understand you correctly, you are saying that the DCX has a sort of preemphasis filter for analog inputs. So how does it deal with the digital input? Do you suppose that there is a similar preemphasis in the digital domain? And what would be the point of this preemphasis? It would be interesting to actually probe the unit and measure it's input circuitry prior to the A/D converter.

Regards,
Ron
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Old 18th May 2005, 01:53 PM   #14
Davey is offline Davey  United States
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Ron,

My simulation doesn't show nearly as much "pre-emphasis" as Jan's, but maybe I've got something setup wrong. I'm seeing an approximate 0.9 db shelving action created by the filter. I think the difference is explained by what the load is seen by the circuit. Jan assumed zero ohms because of the two capacitors shunting the voltage divider on the + side of the inverting amplifier.

Anyway, I've looked at the outputs with both digital and analog inputs and they look flat to me. Any frequency contouring that's going on in the analog sections must compensated for in the digital domain somewhere.

Cheers,

Davey.
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Old 18th May 2005, 02:49 PM   #15
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So it's pretty much a non issue. Thanks Davey.

Cheers,
Ron
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