12
The 261 monitors the AGC-corrected program level through a fre-
quency-weighting filter that favors legitimate speech and music fre-
quencies. When the program level falls approximately 26dB below
nominal for a period of 10 consecutive seconds, the 261 will give the
PROGRAM AUDIO LOSS
alarm shown in the illustration. Concurrent
with the flashing front-panel alarm, a closure to ground will be put
on the rear-panel
PROGRAM LOSS
terminal.
Pressing any front-
panel button will reset the flashing indication for about 5 seconds,
allowing menu items to be selected and set.
The rear-panel tally
will not be interrupted, however. Remote alarm outputs are
not
temporarily reset with the front-panel buttons, but require the fault
condition to be cleared.
Analog/Digital
Inputs
Use the
p
and
q
buttons to cycle to the
INPUT
and
OUTPUT
screen.
With the
w
cursor set as shown below, use
t
and
u
buttons to se-
lect either the
ANALOG
input or the
DIGITAL
input, whichever is the
one that will be used.
Output
Sampling Rate
Regardless of the input mode selection, both the analog and digital
outputs are simultaneously available. When using analog inputs,
the output sampling rate is set on this same screen by dropping the
cursor down and selecting between 32kHz, 44.1kHz and 48kHz.
When the
DIGITAL
input is selected, the 261 will determine the in-
coming sampling rate and display it on the bottom line of the Status
screen. With no digital input, or with a nonstandard sampling rate,
a
?
(question mark) will be displayed and the 261 will be nonfunc-
tional.
The output sampling rate will always be the same as the input rate
when the
DIGITAL
input is used.
