Nevion AAV-HD-DMUX - Manual (Page 13)

AAV-HD-DMUX(-R)/ AAV-SD-DMUX(-R) Rev. 7
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SW1.8 off will not use the DIP switches but will be configured from either the stored
configuration in the module or from GYDA if there is GYDA present. The configuration will be
stored when a GYDA configuration command is used. Therefore if a GYDA is present, the
internal configuration will be overwritten by the GYDA controller.
The switch settings are only read when the module is powered up.
The DIP switch settings control the routing and a couple of other important settings. Other
stored settings, such as data embedding and generator settings will always be used.
3.2.3 EDH insert, SW2.8
SD video output from the module will only contain an EDH packet if SW2.8 is on.
3.2.4 AES Output 1&2 SW3.8
AES outputs 1&2 are extra outputs fed either from the same signals as the DAC converters
or the AES outputs 3&4. AES outputs 1&2 are fed with the same signals as the DAC
converters if the switch is in the off position.
3.3 GYDA Control
Full control of the stereo audio router is possible with the GYDA system controller. 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.
 ØLR, ØLeft/ Right The left channel is phase inverted.
 LØR, Left/ ØRight The right channel is phase inverted.

L+R/2, Left + Right The left and right channels are summed.

MS, MS/AB The left and right channels are converted from AB stereo to MS
stereo.
The sum products (L+R/2 and MS) are reduced in level by 6 dB to avoid any possibility of
clipping.