Cobalt Digital COMPASS 9011 Standard Definition D_A 10-bit SDI to Analog Composite, Y_C and Component - Manual (Page 7)

9011 Owner’s Manual •••• (V 1.1) Page 7 of 22
extended filtering, DNR and Gamma configuration. All adjustments can be saved to non-volatile
memory or Factory defaults can be restored. A De-jitter VCXO is included to reduce input jitter from
high frequencies down to 2Hz.
The 9011 has four reclocked digital output copies of the input SDI signal or three when the Genlock
input is used, and one BNC reserved for Black Burst input. The user must adjust the SDI source’s H-
Phase for horizontal sync alignment. A full 360 degrees of SCH phase is user adjustable on the 9011.
The input and outputs of the 9011 are the following:
Inputs:
‰ One 10-bit SD-SDI video input
‰ One black burst reference input for color framing purposes
Outputs:
‰ Four reclocked SD-SDI video outputs
‰ Four analog SD video outputs
Features
Color Framing
Although an SD-SDI signal carries more information than a composite signal, it does not properly
encode the SCH (Sub-Carrier to Horizontal) phase of the original composite signal. SCH phase is a
measure of the relationship of the start of the color burst to the start of the horizontal sync. In NTSC
each field has an SCH phase of 90
° more than the previous field, thus the SCH sequence repeats every
four fields. Since each SDI field encodes the field type (odd or even) but not the SCH phase, a given
video encoder cannot recreate the SCH phase without a reference signal. This creates problems when
trying to align the signals to the inputs of certain switching device that rely on the color phase being
unified across channels.
The 9011 gets around this problem by accepting reference on either of the two frame inputs, or on a
dedicated BNC on the rear IO module (rear module RM20-9011-A only). When reference is detected,
the card will automatically ensure that the SCH phase of the output matches that of the reference signal.
The reference must be synchronous with the input video for this to work, due to the nature of the
comparison.
There is a control to adjust the offset between output SCH phase and detected reference SCH phase. It
is not needed in most applications.
Software Version
‰ This manual is written for software release number 1.1.
‰ To view the current software release number of your 9011 check the card info menu in Dashboard.
‰ To upgrade your 9011 software, go to the download page at www.cobaltdigital.com to download
the latest release, and upload the file through Dashboard™ (see Dashboard™ user manual, 3-5).