Dest Box; Sync Source/Sample Rate Box - Prism Sound ADA-8 Operation Manual

Prism Sound ADA-8 Multi-channel A/D D/A Converter Operation Manual - Revision 1.00
WITHOUT sacrificing tracks. 'DRE ' is the variant of this format for recorders (or data
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channels) with a maximum 16-bit wordlength, whereas 'DRE ' is used for 20-bit media. The
20
'[20b]' LED shows that 'DRE ' encoding is taking place, whereas the 'DRE' LED without the
20
'[20b]' LED shows 'DRE ' encoding. The Prism Sound DRE encoding scheme is described
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in detail in section 7.4.

5.1.5 Dest box

The Dest (Destination) box indicates which port(s) are assigned as the outputs to the selected
Path, and displays whether digital output ports are operating in Split96 (two-wire) high-rate
mode. The Destination box's Access button attracts the attention of the Menu panel
immediately to the small group of menus that control destination-related parameters. These
include assignment of the destination ports themselves, adjustment of analogue output gains
(if an analogue destination port is assigned) etc. For details of these menus, see the
Firmware Reference.
The green LEDs at the right-hand side of the box show which output ports have been
assigned to the Path. These comprise Analogue Module Slot 1 or 2 outputs, or Digital
Module Slot 1 or 2 outputs. The 'Split96' indicators show when digital outputs are being used
in a 'two wire' mode whereby a single high-rate channel is carried on a normally-two-channel
interface. Note that more than one destination LED can be lit; this might happen when two
Digital I/O Modules are 'cascaded' in Split96 mode to provide all eight outputs, or simply when
multiple output ports have been assigned to the Path (as 'parallel' outputs). A destination
LED which is flashing indicates that a selection has been requested which the ADA-8
firmware cannot accomplish, for example a destination port may have been assigned which
has already been assigned to the other Path.

5.1.6 Sync Source/Sample Rate box

The Sync Source/Sample Rate box indicates the synchronization state of the Path. Its
Access button attracts the attention of the Menu panel immediately to the small group of
menus that control the various synchronization options. For details of these menus, see the
Firmware Reference.
The six LEDs on the left-hand side of the box indicate the selected synchronization source.
'Local' is the ADA-8's internal crystal reference, 'WCK', 'AES' and 'Video' refer to various
synchronization input connectors on the Utility Module (at the right-hand side of the rear panel
of the ADA-8 when viewed from the back). 'WCK' (wordclock) is a TTL-level square wave,
with its rising edge indicating the reference's sample instant – this is connected to the BNC ref
sync input of the Utility Module. 'AES' is an AES11 ('DARS') or AES3 format reference signal
connected to the XLR ref sync input of the Utility Module, or an AES3-id format reference
signal connected to the BNC ref sync input of the Utility Module. 'Video' is an analogue video
signal (PAL, SECAM or NTSC) applied to the BNC ref sync input of the Utility Module. 'DI1'
and 'DI2' are ref sync inputs from the Digital I/O Module fitted in the upper or lower DIO slot
respectively. Refer to the Module Reference for more information about the Utility Module and
its connections.
The six LEDs on the right-hand side of the box indicate the Path's sample rate. The
combination of the '32k', '44k1' and '48k' LEDs, along with the multiplier LEDs for 'x2' and 'x4'
allow for display of standard audio sample rates between 32kHz and 192kHz. Note that
availability of rates may depend of which I/O Modules and firmware version are installed in
your unit. See the Module Reference for details of the capabilities of current I/O Modules.
The '=Ext' LED is lit whenever the Path's nominal sample rate has been set to follow that of
the selected external sync source. It is important to note that the ADA-8 does not insist on
this: it is possible to select a different sample-rate from that of the designated reference sync.
For example you could select an external Wordclock as a Path's sync source, and also
© Prism Media Products Limited, 2002 Page 1.18