7700 MultiFrame Manual
7721AE4-(B)-HD HDTV 4 Channel AES Audio Embedder
Revision
1.5
Page-9
5.
CARD EDGE CONTROLS
The 7721AE4-HD is equipped with an 8 position DIP switch to allow the user to select various functions.
All positions are assigned sequentially such that the first position is located at the left side of the DIP
switch (farthest from to the card ejector). When the switches are set to Off the LED status indicators near
the DIP switch indicate the presence of the AES audio. When other DIP switch combinations are
selected, various operation modes of the module can be set using the toggle switch. The LED Mode
indicators near the DIP switch indicate the settings of each of these modes as shown in Table 4-1. The On
position is down, or closest to the printed circuit board. Sections 5.1 to 5.8 show the assigned DIP switch
functions.
DIP Switch
1 2 3 4 5 6 7 8
Control
Description
Off
Off
Off
Off
Off
Off
Off
Off
Audio Present
On
Off
Off
Off
Off
Off
Off
Off
Audio Delay
Off On Off
Off
Off
Off
Off
Off
Embedder 1 Enable
On On Off
Off
Off
Off
Off
Off
Embedder 1 Group
Off
Off On Off
Off
Off
Off
Off
Embedder 2 Enable
On
Off On Off
Off
Off
Off
Off
Embedder 2 Group
Off On On Off
Off
Off
Off
Off
HANC Handling
Mode
On On On Off
Off
Off
Off
Off
Lock Groups
Off
Off
Off On Off
Off
Off
Off
Sample Rate
Converter Mode
On
Off
Off On Off
Off
Off
Off
Status LED Mode
Off On Off On Off
Off
Off
Off
Loss of Video Mode
--- --- --- --- --- --- --- On
VistaLINK
®
or
Remote Control
Table 5-1: Toggle Switch Function Overview
5.1.
SELECTING THE AUDIO GROUPS THAT WILL BE EMBEDDED
The SMPTE 299M standard permits up to 4 groups of 4 audio channels to be embedded into the 270 Mb/s
video bitstream. Model 7721AE4-HD has two separate embedders that will embed up to four audio
channels (two AES pairs) into one of the groups. The Embedders can be treated as two independent
embedders for unrelated audio content or can be locked together where the audio in both groups is related
and hence its phase must be maintained (for example, 5.1 surround sound audio).
"
Some legacy equipment may not be compatible with two embedded audio groups
present in the video stream.
