Whirlwind Portable AES to Analog Converter AESDA - Manual (Page 2)

7. The Power LED is illuminated when the Power switch is ON. It will dim as the
batteries lose power, thus giving an indication of remaining battery life.
8. The Power Switch applies power from the external supply or the batteries.
When power is applied, the AESDA runs internal diagnostics, culminating in an
LED display test where the 32 LEDs in the three displays are illuminated in
sequence, then extinguished in the same manner. The unit then goes into its
normal operating mode.
9. The Digital Monitor Select switch selects whether “Digital Info” (digital signal
parameters) or “Fault Type” information is displayed on the vertical ten-
segment Digital Monitor LED array.
10. Phones Out Jack provides a high-quality analog version of any digital audio
source received by the AESDA. Peak output level is +4dB, and the output is
capable of driving headphones from 16 to 100 Ohms impedance. It can also be
used to feed an unbalanced line input. The left channel (A) is connected to the
tip, the right (B) to the ring, and the sleeve to common of the unbalanced
3.5mm TRS jack.
11. Phones Vol(ume) Control adjusts the analog audio level present on the
Phones output (3.5mm) TRS jack. The setting of this control has no effect on
the Analog Outputs or the meters.
12. The Battery Compartment is a slide out drawer that accepts four “AA” size
cells. Either alkaline cells or externally-rechargeable Nickel-Metal-Hydride
(NiMH) or Lithium-Ion cells may also be used. Battery life is highly dependent
upon several factors, including load impedance, output level, the use of
headphones, and the mode of the level meters. Typical loading will provide
about four hours of operation with fresh batteries. The AESDA does not have
internal battery recharge capability.
13. The 6VDC external power jack is a 5.5mm x 2.1mm size with the center
contact wired positive and the barrel contact negative. When a plug is inserted
into this connector, the internal batteries are disconnected. A 6VDC 2.5A plug-
in power supply is supplied with the unit. Input voltage can be anywhere from
4.8VDC to 15VDC, provided the power source can deliver at least 12 Watts
peak. This wide input range allows the AESDA to be powered from lantern
batteries, auto batteries, and camera batteries, as well as the familiar AC “wall
wart” plug-in power supplies
14. The Digital Monitor ten-segment LED array displays operational status
and fault diagnostics. The type of information shown on this display is
controlled by the Digital Monitor Select switch. In the “Digital Info” position, the
display shows the detected sample rate, the type of data present, if the data is
consumer or professional mode audio (if an audio stream is detected), if pre-
emphasis is enabled, and if a fault is present. In the “Fault Type” position, it will
indicate the type of fault(s) present, if any, and also if no fault is detected. The
types of faults annunciated are Hardware (internal diagnostics), No Lock (or no
signal present), Parity or Bit Length error, CRC error (if the audio data present
is in Professional mode), Signal Confidence (wave shape, level or symmetry is
borderline or out-of-tolerance), Validity Bit not present, Over Temperature, and
No Fault Detected.
Controls and Functions
1. AES/EBU Input Connectors are provided for Digital Audio input. The
BNC connector provides an input for 75 Ohm unbalanced S/PDIF
audio, and the female XLR provides an input for 110 Ohm balanced
AES/EBU audio. Both inputs are transformer and DC isolated (up to
50V), and accept AES/EBU and S/PDIF signal levels ranging between
5V p-p and 250mV p-p.
2. VU Meters, two eleven segment LED arrays, can display either the
digital input level or the analog output level. The first ten LEDs are
green; the eleventh is red. Two measurement scales are provided, one
for the digital input, which is in dB Full-Scale, or dBfs units, with the red
LEDs illuminating at a point about 1 to 2dB less than the maximum
output of the Digital-to-Analog converter, and one for the analog
outputs. This is measured in dBV, where 1V RMS of output equals
0dBV, with the red LEDs illuminating for an output level of +18dBV.
3. Analog Output Jacks are balanced male XLR connectors, capable of driving
loads from 600 Ohms to near infinity at output levels of up to +27dBV, although
the outputs are metered only to +18dBV. Output noise is less than -95dB. Total
harmonic distortion is less than 0.004% at 0dBV of output, and less than 0.01%
at +18dBV of output. Frequency response is flat to within 0.2dB from 22Hz to
20kHz. Each output has its own independent level control, which, along with
the VU meters, allows precise setting of signal level for each channel. Pin 1 is
signal ground, pin 2 is positive, pin 3 is negative, and the shell is case ground.
4. Output Level Controls independently control the level presented at the
analog outputs. The level of each output may be monitored on the VU meters
by selecting Analog Output with the Meter Source Select switch.
5. The Meter Mode Select switch controls how the VU Meter information is
displayed. In “DOT” mode the VU display will illuminate the LED that most
corresponds to the output level at that instant. In “BAR” mode, the VU display
operates as a conventional bar-graph LED display. The dot mode conserves
power allowing longer operation under battery power.
6. The (VU) Meter Source Select switch controls whether the level of the Digital
Input or the Analog Outputs are selected for monitoring on the VU Meters. In
the “D(igital) Input” position, the Analog level of the decoded Digital Input is
displayed. In the “A(nalog) Output” position, the level present at the Analog
Outputs XLR Connectors after the Output Level controls is displayed.
99 Ling Road . Rochester, NY 14612
Phone 585 663-8820 . Fax 585 865-8930
Email: [email protected]
http://www.whirlwindusa.com
IN
P
U
T
S
PHONES
C
H
A
N
N
E
L
B
INFO
AESDA
LEVEL METERS
PORTABLE AES TO ANALOG CONVERTER NO LOCK
PHONES VOL
FAULT
TYPE
DIGITAL
FAULT
PRE-EMPH
CONSUMER
METERS
A. OUTPUT
D. INPUT
SOURCE
POWER
BAR
DOT
MODE
CRC ERROR
PARITY ERROR
NO ERROR
VALIDITY BIT 192 kHz
AUDIO
176.4 kHz
88.2 kHz
96 kHz
48 kHz
HARDWARE FAULT
DIGITAL MONITOR
44.1 kHz
A
E
S
/E
B
U
C
H
A
N
N
E
L
CHANNEL B
OUTPUT LEVEL
-33 -45 -18 -15 -27 -21 -3 -9 -6 -12 0
-15 -27 0 +3 -9 -3 +15 +9 +12 +6 CLIP
OVER TEMP
CHANNEL A
A
A
N
A
L
O
G
O
U
T
P
U
T
S
6VDC
1
2
3
4
5 6
8
7
9
10
11
12
18 13
14
B
A
dBfs
dBV
MADE IN USA