Operating instructions
GUIDE TO INSTALLATION AND OPERATION
26 | FRS-1801
Mix 4Ch: This mode allows a 3-input or 4-input mix on the chosen even
output. A standard 2-input mix is
available on the odd output. On the same tab, the two selected sources of the even channel are mixed
with the one or two selected sources of the odd channel. The four sources are mixed, with the level of
each source adjusted using its slider or data entry box. You can swap the odd and even outputs by
putting a check mark in the Channel Swap (1&2) checkbox.
Note: in the case of SUM and MIX, if either of the two input channels is non-PCM, the output will always
be SOURCE A
Mute: Mute the audio channel by checking this box.
Source A & Source B: This sub-section allows the source channels (A&B) to be selected for each output
channel.
ABUS Select: V, A1, A2: selects the embedded input audio (V), one of two audio companion cards (A1
or A2) or one of two Dolby-E decoding modules installed on companion cards (A1 or A2 channels 9-16)
to be used as the source for this channel. Audio Bus is configured in the ABUS group.
Channel: Channel 1, …, Channel 16: selects the channel to be used from the selected audio source.
Level (dB): -96 to 0 dB in 0.5 dB steps: sets an attenuation level to the channel source. For non-PCM
audio, the level value is overridden to 0 dB.
3.4.9 The Reference panel
This panel allows the selection of the reference to
be used by the FRS-1801.
Use the radio buttons in the Reference Source area
to select from the following options:
• Auto – this mode selects the first source
detected in this order of priority:
o External Reference input
o URS
o Selected Input signal
• External – selects the signal connected to the
rear-panel REF IN connector
• URS (Universal Reference Signal) – selects the
internal reference from the backplane
• Input – uses the currently-selected input signal.
URS Format – use the radio buttons in the URS
Format area to select whether the URS is OFF,
29.97 Hz or 25 Hz.
• When URS is OFF, the URS reference
format source cannot be selected, and will
also be ignored by the automatic detection
mode.
Figure 3.27 Reference panel