Grass Valley 8920MUX - Manual (Page 15)

8920MUX Instruction Manual 15
Power Up
Video input present Synchronous 48 kHz
audio input present Delete G1, G2,
G3, or G4 syn.AES
asyn.AES The selected group, if present, will be deleted from the incoming stream
and the corresponding G1-4_PR will flash. If insert is selected for the
corresponding group, the module will insert the AES/EBU input as that
group and light the G1-4_INS LED.
Video input present Synchronous 48 kHz
audio input present 20-bit syn.AES
asyn.AES
syn.matrix The newly inserted group will be inserted in the 20-bit format. The 24b
LED will be off.
Video input present Synchronous 48 kHz
audio input present 24-bit syn.AES
asyn.AES
syn.matrix The newly inserted group will be inserted in the 24-bit format using the
extended audio packet for the additional bits. The 24b LED will be on.
Video input present No audio input Any syn.AES
asyn.AES
syn.matrix Input signal will be passed to the output with no new group embedded.
AES1 P and AES2 P LEDs will be off.
No video input Any state Any syn.AES
asyn.AES
syn.matrix Output is random noise (low level static). The 525 and 625 LEDs indi-
cating valid input video will be off.
Video input present Asynchronous
48 kHz audio input
present Any syn.AES
syn.matrix AES1 P and AES2 P LEDs will be on if the AES audio is close to the
correct frequency. If an insert or replace is selected, the module will try
to embed the new group but a click or noise will be noticeable. If the
frequency is not close, the group will not be embedded and the AES1 P
and AES2 P LEDs will be off.
Video input present Asynchronous
48 kHz audio input
present Any asyn.AES AES1 P and AES2 P LEDs will be on. The module will embed the new
group and light the corresponding G1-4_INS LED. If the frequency is
not close, the group will not be embedded and the AES1 P and AES2 P
will be off. Small audio effects will be heard at slow rate due to drop-
ping or repeating samples in asyn.AES mode.
Video Input present Both audio inputs are
not 48 kHz Any syn.AES
asyn.AES
syn.matrix No audio groups will be added and AES1 P and AES2 P LEDs will be
off and G1-4_INS LED will flash.
Video input present One audio input is
not 48 kHz and the
other is 48 kHz Any syn.AES
asyn.AES
syn.matrix Audio group will be added and AES1 P and AES2 P LEDs will be off for
non-48 kHz audio and on for 48 kHz input and G1-4_INS LED will be
on. The channels related to the non-48 kHz audio will be missing in the
embedded group.
Table 3. Possible Operating Conditions
SD Video Input AES/EBU Input Setting Mode(s) Output Condition