Cobalt Digital COMPASS 9822 Downconverter - Manual (Page 12)

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9822 Functional Description
1-8 9822 PRODUCT MANUAL 9822-OM (V4.1)
Timecode Processor
(See Figure 1-2.) This function provides for extraction of timecode data from
the input video, and in turn re-insertion of timecode data into the output SDI.
In this manner, timecode data can be preserved, even after format conversion.
The function can monitor the SDI video input of the card for supported
timecode formats, and then select and prioritize among SDI VITC, SDI
ATC_VITC, and SDI ATC_LTC timecode sources. If the preferred format is
detected, the preferred format is used by the card; if the preferred format is
not detected, the card uses other formats (where available) as desired. When
receiving HD-SDI, both CEA 608 and CEA 708 are supported, with CEA 608
and CEA 708 (containing CEA 608 packets) converted to line 21 closed
captioning on outputs down-converted to SD.
The function also provides conversion between various received timecode
formats and provides insertion, line number control, and re-formatting to
SDI VITC Waveform and/or ATC_VITC timecode output format.
Option +LTC allows bidirectional transfer and conversion
between VBI formats over SDI and audio LTC, as well as RS-485 LTC.
Audio LTC can be received or sent over a selected embedded audio channel.
Figure 1-2 Timecode Processor
SDI VITC
Detect/Extract
SDI ATC_LTC
Detect/Extract
SDI ATC_VITC
Detect/Extract
Priority/
Select
SDI
Video
Input
SDI VITC
Timecode
Proc/Embed
ATC_VITC
Timecode
Proc/Embed
SD–SDI Video
Output
Insert
Control
Line
Number
Control
Buffer/
Format
HD/SD–SDI
(From Video Proc)
Audio LTC
Select/Extract
Audio/
RS-485 LTC
Audio/RS-485
LTC Generate
Audio LTC Out
RS-485 LTC Out