Nevion AV-HD-XMUX - Manual (Page 15)

AV-HD-XMUX (-T/R) / AV-SD-XMUX (-T/R) Rev. L
nevion.com | 15
3.2.3 LED mode, SW2.7
The switch controls how the two audio LEDs function. If the switch is off, the LEDs show the
AES receiver status. If the switch is on, the LEDs show the presence of embedded groups.
3.2.4 EDH insert, SW2.8
SD video output from the module will only contain an EDH packet if SW2.8 is on.
3.2.5 Fallback generator control, SW3.7
This switch is used to control the outputs when the input signals are not present.
SW3.7 on: The Video output will be disabled if the input signal is removed. Exception: The
module will produce a video signal if the internal video generator is switched on to override
the input.
The AES outputs will be disabled if the source routed to that output is not present. The input
presence is embedded in the embedded audio data packet so that an AES input failure will
disable an AES output which uses that embedded audio.
SW3.7 off: The internal video generator will be used as an input until a valid video signal is
detected on one of the inputs.
The AES outputs will always be on but the signal will be silence.
3.2.6 20/24 bit (SD), SW3.8
SD video will contain embedded audio with a word length of 24 bits if SW3.8 is on.
SD video will contain embedded audio with a word length of 20 bits if SW3.8 is off.
HD video will always contain embedded audio with a word length of 24 bits.
3.3 GYDA Control
Full control of the stereo audio router is possible with the GYDA system controller. Direct
control with SNMP is being developed.
The module stores its routing configuration in non-volatile memory when a GYDA command
is given. This allows complex configurations to be restored after a power loss.
If a GYDA system controller is present, the last configuration of the module will
be only be restored by GYDA if SW1.8 is off. The intention is that SW1.8 is used
to show that the card is manually configured when switched on.
3.3.1 Audio delay lines
The unit has four stereo audio delay lines connected to the audio router. Audio to be delayed
is routed to one of the delay inputs and the output of that delay is routed to the intended
output. The length of each delay line is set up on the configuration page of GYDA. The
maximum delay for each of the four delays is 16384 audio samples, which is about 341ms.
The delay lines may be cascaded if longer delays are required.
3.3.2 Stereo audio processing
The output of each stereo signal may be manipulated (LL, RR, LR, RL ØLR, LØR, L+R/2,
MS) this is controlled with the GYDA controller.
The stereo signals may be output in one of the following ways:

LR, Left / Right No change.

RL, Right/ Left Channels are swapped.

LL, Left/ Left Left channel is copied into the right channel.

RR, Right/ Right Right channel is copied into the left channel.