Cobalt Digital COMPASS 9391 3G_HD_SD-SDI Timecode Burn-In Inserter - Manual (Page 9)

9391-TCB-OM (V1.3) 9391-TCB PRODUCT MANUAL 1-5
Introduction
9391 Functional Description
9391 Functional Description
(See Figure 1-1.) The 9391 allows LTC timecode (received either as SMPTE
embedded timecode or on an RS-485 LTC input) to be burned onto the active
video area and outputted over output SDI. The card can also burn up to 16
characters of static text onto the program video path.
Note: “Video channel” or “video path” in the descriptions in this manual and on card
GUI controls refers to the video path accommodating the SDI input on the
card. This video channel has independent timecode, text, and flat-field con-
trols as described in this manual. This video channel is eventually outputted
from the card via the output crosspoint.
A failover/manual select function provides for a user-selectable flat-field to
replace program video either as a manual selection or upon loss of input
video. The generated flat field can be timed to input video, or to a frame
reference signal. Timecode burn-in and text can be sized and positioned
anywhere in the active video area using easy-to-use positioning controls.
The 9391 also includes a 2x4 SDI output crosspoint, with processed SDI OUT
or reclocked SDI IN routable to up to four SDI outputs.
An RS-485 LTC input RS-485 LTC IN is received by the card for timecode
burn-in on the SDI channel. (The LTC input received by the card must have
the customary zero-crossing associated with RS-485. If the LTC source is
offset above or below ground (0 V), the sources must be capacitively coupled
or passed through an analog audio DA that can restore zero-crossing.)
Reference Function
The 9391 uses a common reference for the SDI video channel, with the
reference being selectable from
Input Video , REF 1 , or REF 2 obtained from the
frame references. This provides for proper rendering and switchover
transitions from program video to the flat-field generators as well as stable
output video.