Crystal Vision
Using card edge controls
TANDEM-300 User Manual R1.2
49
14/02/2008
6.9 Data packet management settings
Contiguous packing
TANDEM-300 supports contiguous packing, which ensures that new audio data packets
are embedded at the first free location after the EAV in the HANC. Contiguous packing
allows for all four groups and other data, such as groups ‘marked for deletion’ to co-exist
sequentially in the HANC.
Non-contiguous packing would overwrite existing data. Although this saves on HANC
space the start of the next group is likely to be damaged on some TV lines.
The menu contiguous packing menu is obtained with MENU DIL, lever 5 ON (DOWN),
all other levers UP (OFF
)
and the SEL switch in position 8 for side 1. The display will
confirm TANDEM’s selection of contiguous packing.
SEL
Display
Comments
8
9
SD1 contig
Does not affect TANDEM-
300
TANDEM always selects contiguous
packing
Blanking HANC before embedding
This removes all incoming ancillary data except EDH after the inputs have been read and
before any new data is embedded.
The menu is obtained with MENU DIL, lever 5 ON (DOWN), all other levers UP (OFF
)
and the SEL switch in position A for side 1 and B for side 2. Turn the shaft encoder to
select between ‘SDx blank’ or ‘SDx noblnk’, where x is the TANDEM-300 side 1 or 2.
SEL
Display
Comments
A
SD1 blank or noblnk
Use shaft encoder to select blank or noblnk.
It is recommended to leave this setting as
‘noblnk’ for normal operation.
B
SD2 blank or noblnk
Enabling EDH functions
EDH functions may be selected to be ‘OFF’ / ‘pass through or ‘ON’ / ‘include EDH
functions’. EDH off/pass through disables the EDH function. When set to ON then the
EDH function calculates and inserts new Active Picture and Full Field EDH values.
If ‘C’ embedding is enabled, or if ‘Mark for Deletion’ or ‘Blank HANC’ are in place then
EDH CRC values will no longer be valid. In this case, new EDH insert CRC values are
calculated and inserted into the EDH data block in each TV field.
