Nevion AAV-HD-XMUX User Manual
Page 15
AAV-HD-XMUX(-T/R)/ AAV-SD-XMUX(-T/R)
Rev. G
nevion.com | 15
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.
3.2.3 RS422 Data port configuration
The RS422 data 8P8C Modular jack input must be configured with GYDA. The baud rate,
data length, parity and stop bits must be configured if UART mode is used.
The router destination where the data is to be embedded must be set up and the source
channel containing the received data that will be output on the 8P8C Modular jack must be
also be configured.
See further Chapter 3.3.
3.2.4 Transport and shuffling of audio groups
The AAV-HD-XMUX stereo audio router involves de-embedding, buffering and re-embedding
which introduces a small delay relative to the video signal.
The group router is used to avoid this extra delay. Groups that only pass through the group
router are re-embedded in the same video line. This avoids any extra delay and means that
incompatible audio formats (asynchronous audio) may still be transported. The AAV-HD-
XMUX automatically uses the group router whenever possible when controlled with the DIP
switches.
“Shuffling” of groups is when existing embedded audio groups are re-assigned to different
groups. Copying of groups is also possible i.e. Group 1 may be transported to Group 1 and
duplicated to Group 2. This function also takes place in the group router which means that
there is no extra delay.
3.2.5 Audio generator
The stereo audio generator is available in the audio router as a source. It is a high purity 1
kHz sine wave with a 250ms interruption on the left channel every 3 seconds. The audio
level may be set to one of two standards. The two levels are -18 dBFS and -20 dBFS. These
two levels correspond to EBU R68 and SMPTE RP 155.
3.2.6 Video generator
The video generator has several different simple signals:
Color bar, 100% white, 75% colors, no set-up level.
Red, Green, Blue or Black full field.
The generator may be used as a backup video source if there is no video signal present at
either of the video inputs. The generator may also be switched on with GYDA. This will
override video input but the generator signal will be locked to the input.
The video standard of the generator may be set with GYDA but only if there is no video input
present.