8 - Appendix
Useful Information
Useful Information
AES/EBU to S/PDIF Cable Adapter
This simple adapter cable allows you to receive AES/EBU digital audio via the S/PDIF
input on the E-MU 1010 PCI card. This cable may also work to connect S/PDIF out from
the 1010 PCI card to the AES/EBU input of other digital equipment.
From AES/EBU
Device
To S/PDIF
12+In
N.C.
3
-
Cables - balanced or unbalanced?
All inputs on the E-MU Digital Audio System are designed to use either balanced or
unbalanced cables. Balanced signals provide an additional +6dB of gain on the inputs
and are recommended for best audio performance, although unbalanced cables are Ţne
for most applications. If youOre having problems with hum and noise or just want the
best possible performance, use balanced cables.
WARNING: Do NOT use balanced audio cables when connecting balanced outputs to
unbalanced inputs. Doing so can increase noise level and introduce hum. Use balanced
cables ONLY if you are connecting balanced inputs to balanced outputs.
Balanced Cables
Balanced cables are used in professional studios because they cancel out noise and
interference. Connector plugs used on balanced cables are XLR (3-prong mic connector)
or TRS (Tip, Ring, Sleeve) 1/4" phone plugs.
Shaft = Gnd
Tip = Hot (+)
(-) 32 (+)
Ring = Neutral (-)
1 (grd)
Balanced TRS Plug
Balanced XLR Plug
(male)
Balanced cables have one ground (shield) connection and two signal-carrying
conductors of equal potential but opposite polarity. There is one Ohot� or positive lead,
and a Ocold� or negative lead. At any point in time, both conductors are equal in voltage
but opposite in polarity. Both leads may pick up interference, but because it is present
both in and out of phase, this interference cancels out at the balanced input connection.
Unbalanced Cables
Unbalanced cables have one conductor and one ground (shield) and usually connect
via unbalanced 1/4" phone plugs or RCA phono plugs. The shield stays at a constant
ground potential while the signal in the center conductor varies in positive and negative
voltage. The shield completely surrounds the center Ohot� conductor and is connected
to ground in order to intercept most of the electrical interference encountered by the
92Creative Professional |
ACEC
