
7700 MultiFrame Manual
7720AE4-HD HDTV 4 Channel AES Audio Embedder
Revision 1.1 7720AE4-HD-7
5. CARD EDGE CONTROLS
The 7720AE4-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 1. The On position is down,
or closest to the printed circuit board. Sections 5.1 to 5.7 show the assigned DIP switch functions.
DIP Switch
12345678
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 2: 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 7720AE4-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 many not be compatible with two embedded audio groups
present in the video stream.
The source for Embedder A is the audio coming in on the AES IN 1 and 2 connectors. The source for
Embedder B is the audio coming in on the AES IN 3 and 4 connectors. There separate DIP switch settings
that are used to enable or disable each embedder and to set the audio groups where the embedders will
put the audio on the SDI output.
When the DIP switches are as shown in Table 3, the toggle switch is used to enable or disable Embedder
1. Each time the toggle switch is pressed up or down the Embedder 1 Enable mode will change as
indicated by the LEDs in Table 3.
When set to Disable embedder 1 will be disabled. When it is set to Enable the embedder destination can
be set when the DIP switches are set as shown in Table 4. Channels 1 and 2 from AES input 1 will be
embedded into channels 1 and 2 of the selected group. Channels 1 and 2 from AES input 2 will be