Eclipse User Manual
Eclipse User Manual Page 24 of 58 Release 1.10.1
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 de-
tected rate
(signals that are way off 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 digi-
tal 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 application.
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 55kHz) 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
9
6 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 example,
Loop10 and Loop20.
If a program without the
9
6 icon is currently loaded, it will not be possible to select a high sample rate, and
Eclipse will refuse (i.e., not lock to) an incoming digital signal above 50kHz sampling.
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 continue.
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 or the Cns (consumer) protocol for output. Normally, 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)
.
By changing
SETUP DIG-OUT FORMAT (EMPHASIS) from off to on, you can add emphasis flags to your
output audio. If you’ve never heard of “emphasis,” leave it off and skip the rest of this paragraph! Emphasis is
an outmoded “feature” of older A/D and D/A technology that filters the digital audio to make the best use of available headroom. However, few devices
use emphasis these days, so you probably want to leave it off unless you have good reason to do otherwise. Changing the emphasis flag does NOTHING
