two digitallish questions.

[Dave Krooshof]

Hellew you guys (m/f),
While enjoying hanging out here, two questions suddely popped up,
like a noise burst from a transistor that should go ashes to ashes.

1.) 12Mhz beep on outputs of DAC
I have a digidesign 882 in my studio. and hell, its noisy.
I sent it to digidesign to have it repaired, but they claimed -30dB
was within spec! When I asked them about it, they said it was HF,
and it should not be audible.
Then I connected it to the _Analogue_ scope.
And, blammo, there it was onscreen: 12Mhz @ -30dB  :-(
The noise is just my mixingdesk in protest to this beep!
What's the easiest way to cancel this out from balanced outputs?
Could I just solder two matching capacitors? What value?

2.) Digital to digital copying is clipping.
The following is weird: In our school one of my tasks is to splice up
music students dance too. Sometimes they come up with Aphex Twin :-)
other times, they bring in Britney Spears :-(
The odd thing is, the top40 cd's sound OK in my cd player,
but when copied into my Mac, digitally, they CLIP!!!
Not only do they hit 0dB, the waves actually look clipped when I zoom in.
Also, it sounds clippeder then from the cdplayes analogue out*!
Other cd's come in at expected volumes, toasting my ow cd and reloading
them into the Mac shows hardly** any difference.
As a test: The lexicon's dig-in is pushed into the redled district as well,
but
again only by those top40 cd's. What can be going on here?



Dave


*So you see, analogue is _always_ better :-)

**exept that files grow longer in repeating this process of toasting and
reloading.
Somewhere something hallucinates extra bits to the files. Interesting.

--------------------------------------------
Dave Krooshof http://www.xs4all.nl/~krooshof
geluidstechnicus @ http://www.ahk.nl/the/theatertechniek_ov.html
webmaster: http://www.popronde.nl
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