User`s guide

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14
User’s Guide
Advanced Features
Advanced Features
It is inevitable you will come across a setup which does not fit into
the examples detailed within the Basic Setup or example Applications
sections. For those cases, the 88192 has a few deeper settings to
accommodate.
SoftClip:
SoftClip is available on each analog input pair. SoftClip can help reduce
occurrences of those nasty “digital overs” during peak transients by
gently “rounding them off”. SoftClip should not be used as a substitute
for a quality analog compressor/limiter, however. SoftClip can be
toggled on and off in the setup menu, level 5.1. Refer to Appendix A.
Sample Rate Conversion:
Sample Rate Conversion (SRC) is available on all digital inputs. When
SRC is enabled for the ADAT INs, it is applied to all eight channels. For
AES INs, SRC can be enabled per input pair. SRC can be toggled on
and off in the ADAT and AES setup menus, level 3 and 4 respectively.
Refer to Appendix A.
SRC is necessary when the sample rate of all digital inputs cannot be
absolutely guaranteed. This is commonly encountered when accepting
digital inputs from different devices, some or all of which do not have
the ability to lock to a common sync source (e.g. Word Clock).
SRC is also commonly used to accommodate inputs from devices
which must operate at a clock rate different than the 88192, i.e. the
88192 is operating at 44.1 kHz while accepting AES input from a DAT
machine operating at 48 kHz.
NOTE: SRC is enabled by default as a convenience. If you can
guarantee that all of your digital inputs to the 88192 are locked to the
sample rate the 88192 is using, SRC can be safely turned off.
Routing in Pairs:
Until now, the provided setups have assumed octet (groups of eight)
routing. For those times when the 88192 may be accepting sources
consisting of less than eight channels from multiple devices, even
in different formats, the Pair Routing options must be used. Routing
in Pairs is enabled in the System Setup menu, level 9.1. Toggle the
Routing Unit option to “2 chs”. This will expose a much more complex
Routing menu (see Appendix A, menu level 7). You will now have the
ability to route any input pair to any output pair, even across formats.
NOTE: When using Pair Routing, the use of SRC is highly
recommended due to the fact that this type of routing usually
incorporates sources from different devices. It can be difficult to
guarantee sample frequency synchronization of the various inputs.
External Sync:
Until now, the provided setups have assumed the 88192 is the clock
master in the system. For those times when the 88192 is incorporated
into an existing setup with a dedicated master clock, or for those times
when the 88192 just must be synchronized to another device, the
88192 can sync to any sample rate between 30 and 200 kHz via its
Word Clock, AES or ADAT inputs. (The 88192 can only sync to sample
rates up to 100 kHz via ADAT.) To sync to an external device or clock,
navigate to the Sync Setup menu (see Appendix A, menu level 8).
Rotate the encoder to select “External:” and push the encoder to edit.
Rotate the encoder in order to sync to either Word Clock, ADAT IN, or
an AES input pair.
NOTE 1: When external sync is enabled, internal is automatically
disabled and vice versa.
NOTE 2: The Sync menu will display the incoming sync rate and the
lock status. This can be very useful for diagnostics! The locked status,
sample rate and sync source are also visible on the main status screen
(see Appendix A, menu level 1).
SMUX IN/OUT:
The SMUX IN mode must be manually set when using eight channels of
ADAT SMUX
2
input (at sample rates between 50 and 100 kHz). SMUX
IN mode can be toggled on and off in the ADAT setup menu, level 3.
Refer to Appendix A. SMUX OUT mode is automatically set depending
upon sample rate. If the sample rate is greater than 50 kHz, SMUX OUT
is ON.
Metering:
Full user control is provided over metering. From the main status
screen, simply rotate the encoder to cycle through the available
metering sources (see Appendix A, menu level 1). Pressing the
encoder will toggle between system status indications and meter scale
indications. Control over clip hold and peak hold times is also provided.
Clip detect threshold (see Appendix A, menu level 6) determines the
number of consecutive full-scale samples that must occur before the
signal is considered clipped (or before a clip is registered).