On Dec 27, 7:59 am, "Phillip W. Palmer, CAS"
wrote:
> > the Line Out Booster cable if you are going to be cabled
>
> Scott (and other Cantar users),
>
> What's the Line Out Booster cable?
>
> ~pwp
I'm considering a Cantar purchase and have been researching this. The
manual is generally extremely thorough, but the line-out is only
addressed in the specs on the last page.
Per the Cantar manual, "Line-out XLR5(M) Symetrical, -10dBu out @
-18dBFS on track" and the Line-out Booster +12 is described as
"Two 12dB gain transformers make the Line-out deliver 0dBu at -18
dBFS track level"
So I guess 12 dB of gain raises it 10 dBs, which is a little strange.
Essentially it takes it from consumer line level to DIGITAL
professional line level. With all the Cantar does I am surprised an
external cable is required to achieve this.
I have a question. The Cantar manual also says, "Note: HD camera line-
in practice is -20 dBu, not 0 dBu"
Can someone explain this to me. I thought 0dBu on the mixer (or +4dBu
on older, analog-oriented mixers) aligned to -20 dBFS on a digital
recorders or cameras (or -18dBFS if you prefer, or -12dBFS on a pro-
sumer camera). If HD camera line-in practice is -20 dBu, then why
does the Cantar line-out deliver -10 dBu or boosted to 0 dBu with the
booster cable?
To my knowledge HD cameras are no different than standard def digital
cameras. Digital cameras, like digital recorders, use a dBFS scale,
right? Do they mean to be making the distinction between digital and
analog cameras?
For general edification of interested RAMPsters, I found a nice
description of the decibel system at:
http://www.sencore.com/newsletter/Oct06/MeasDigAudLvls.htm
I found this part enlightening:
Analog vs. Digital Levels -- the dBFS Scale
Digital audio levels are measured differently than analog audio
levels. Yes, yet another and different dB system is used. The dB
system in digital audio starts at the top and defines the loudest
sound level that is to be digitized. This top or full scale view of
the audio levels results in a full scale or "FS" system of dB
measurement. A 0 dBFS measurement unit is to be the highest audio
level. Assuming this is to be at the highest audio level before
clipping occurs, this corresponds to an analog level of 24 dBu.
Therefore, 4 dBu (dBu =dBv) is the same as - 20 dBFS or 0 VU.
While this is generally accepted as the range of digital audio, it is
not a hard standard. When digital audio values are converted back to
analog, some digital audio equipment provides level selections to
shift the analog output levels of 0 VU to -18 dBFS or -14 dBFS.
Lowering the dBFS relationship increases the audio sound levels output
from the D/A converter.
The rest of it is good also, but I am obviously still a little
unclear. Hey, the tracks always sound good so I must be doing
something right. :)
Paul
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