Propeller Head Plaza: RE: I was asking a much simpler question. by Todd Krieger Technical and scientific discussion of amps, cables and other topics.

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Posted by Todd Krieger (A ) on September 11, 2007 at 19:50:42

In Reply to: I was asking a much simpler question. posted by jsm on September 11, 2007 at 16:36:57:

"I was dealing with the analog signal put out by three different devices and asking how well I could encode that signal with RBCD."

Oh I see..... So if it was originally digital, it was sent to the DAC and then converted to RBCD.....

"For two devices RBCD worked quite well, for one (SACD original source) it didn't."

Interesting..... You may have dug up some underlying flaw in the SACD format..... It would be interesting to see if it shows up in a scope trace......

Re-digitizing a signal after a D/A can have side effects. For example, if the jitter is encoded onto analog media, and then sampled again in A/D, the jitter will be seen as "amplitude errors" in the new data. Which is noise. (The new sampling doesn't see the jitter from the previous digitization, it only sees deviations in amplitude as a result of the jitter.)

"I have no doubt that if I used a better digital encoding method than RBCD I would have done better with SACD, which would further strengthen the point I am trying to make (probably not very well)."

It's hard to say. SACD is a totally different format/conversion, involving pulse density modulation instead of data numerically depicting amplitude (pulse code modulation).

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