Eclipse User Manual
Eclipse User Manual
Page 26 of 66
Release 4.0.1
WClk
Use
WClk
to use the word clock input as the clock source.
If the device you are slaving to has a word clock output,
you are advised to use it in preference to
DigIn
described above - word clock is a little
more reliable. The Eclipse will read the rate
(~30kHz-50kHz and ~54kHz-99kHz)
of the input
and will display it next to
WC In
. In addition, the “rate & source” indicator pictured
above will reflect the fact that you have chosen an external clock source (
EXT
will light).
It will also light the LED that most closely matches the detected rate
(signals that are way off
frequency will cause the nearest LED to blink)
.
Note: If there is no signal at the digital input or if the signal is absent or corrupt, the
EXT
LED and rate LED will blink and the Eclipse will switch to the
internal
rate closest to the
last
valid
external rate.
SR-CNV
Eclipse features a sample rate converter (
SRC
) on its
digital input, which allows it to accept a digital signal
whose sample frequency differs from its main clock source. This is mainly used to accept a
signal at say 44.1kHz (from a CD player, for example) while operating at 48 or 96kHz.
However, it can be used for 48kHz to 96khz conversion, or any other mixed-rate applica-
tion.
Note that the SRC tends to require a higher quality input signal for correct operation. For
this reason, the SRC should be disabled (set to
off
) when not needed.
Using Higher Sampling Rates Disables Some Programs
Higher sampling rates (greater than 50kHz) may yield higher fidelity, but some programs won’t function
at higher rates
(higher rates require twice the processing power and twice the delay capability!)
.
You can tell if a preset can run at higher sampling rates by looking for
the
96
icon between the preset’s number and name. In some cases there
are two versions of the same program, one for high rate operation, and one for low rate operation, for ex-
ample,
Loop10
and
Loop20
.
It will not be possible to select a high sample rate if a program without the
96
icon is currently loaded and
Eclipse will refuse (i.e., not lock to) an incoming digital signal with a sample rate greater than 50kHz.
Similarly, if a sample rate above 50kHz is selected, and you try to load a program without the
9
6
icon,
Eclipse will complain vociferously and will not let you do so.
Things would be simpler if we only used 96kHz capable presets, but then you would be paying for a lot of
processing power, half of which would be wasted at 48kHz.
Digital Output
The XLR, RCA, and optical digital outputs will
all
output digital audio
all
the time, and will
all
output
the
same
protocol
(with the exception of the optical output set to ADAT)
! Therefore, you must choose the protocol
for your most “important” output or base your choice on the requirement of the device you’re connecting
to. The sampling rate of the output audio is set at
SETUP
DIG-IN (CLOCK)
as described above.
By pressing
SETUP
DIG-OUT FORMAT (CS-TYPE)
, you can select either
the
Pro
(professional) or the
Cns
(consumer) protocol for output. Nor-
mally, you will set this to
Pro
if the XLR output is your most important send, or
Cns
if the RCA or optical
outputs are your most important sends
(ADAT output is different and is addressed below)
.
Summary of Contents for Eclipse
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