Auditronics 220 Digital Audio Console, Техническое руководство, Страница: 35 / 109

page 3 – 4
220 / March 2000
O U T P U T M O D U L E
peak signals such that the absolute maximum peak signal is very close
to, but does not exceed, the maximum or highest digital word in the
AES bit stream. This implies that any decrease in signal caused by
placing the console fader at a “normal” setting somewhat less than full
up needs to be made up at the output of the console or the signal will
be lower than it was at the source. Radio consoles are normally operated
with their faders at less than full up to allow for some control over level
and mixing ( if a signal is too low or quiet, the fader can be moved up
until the signal matches the normal levels as shown in the console
meters.). By using the jumpers, the user can configure what the normal
fader setting (and hence the output make-up gain) should be. Consult
the “Global Gain” table in the “Internal Programming Options” sec-
tion, page 3-7, for the gain values. The 220 console is normally shipped
with a make-up gain setting of +12dB for a nominal fader setting of
-12dB from the top. Note that setting the make-up gain too high for the
signals and fader settings used can result in a clipped or distorted signal,
just as it could with an analog console.
4. The fourth function is serial interface control. The front panel of
the OMD-220 module has a pushbutton LOC/REM switch. Activating
this switch will enable the remote serial interface to the console, and de-
activating the switch will disable the remote serial interface. When the
interface is activated, any device connected to the interface can control
any of the console functions. Note that the console operator also has
control of the console functions even when the remote serial interface
is enabled; the console will respond to any command regardless of
where it comes from. When the interface is disabled, the console will
not respond to any commands sent to the remote serial interface; it will
respond only to the console switches and faders.
DSP
DSP functions solely as a mix engine, combining all of the console
audio signals as directed by the console faders and switches to produce
the various output mixes for PROGRAM, AUDITION, AUXILIARY,
UTILITY, CUE, and TELEPHONE.
The DSP operates at a factory set sample rate, normally 48KHz,
which dictates the output sample rate of the 220 console digital outputs.
Consult Wheatstone Tech Support if you wish to use a different output
sample rate. Since all of the console digital inputs are equipped with
sample rate converters, the console inputs will accept any sample rate
between the range of 1/2 to twice the output sample rate, and will
actually track a variable sample rate as long as it remains within this
range. This feature allows you to interface different types of digital
sources into the console, each with different sample rates.