Cobalt Digital COMPASS 9392 3G_HD_SD-SDI Dual-Channel Timecode Burn-In Inserter - Manual (Page 9)

9392-TCB-OM (V1.3) 9392-TCB PRODUCT MANUAL 1-5
Introduction
9392 Functional Description
9392 Functional Description
(See Figure 1-1.) The 9392 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 descriptions in this manual and on card GUI
controls refers to either of the two independent video paths accommodating
the two SDI inputs on the card. Each of these independent video channels
have independent timecode, text, and flat-field controls as described in this
manual. The two video channels are eventually outputted from the card via
the output crosspoint.
Independent, per-channel 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 9392 also includes a 3x4 SDI output crosspoint, with SDI OUT A
(channel A), SDI OUT B (channel B), or reclocked SDI IN A routable to up to
four SDI outputs.
Two independent RS-485 LTC inputs RS-485 LTC IN (SDI A) and RS-485 LTC IN
(SDI B) are received by the card for each SDI channel. (The LTC inputs
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 9392 uses a common reference for both SDI video channels, with the
reference being selectable from
Input Video A , Input Video B , 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.
Note: Both program video inputs must be of the same refresh rate (e.g., 59.94 or
50, or co-related (29.97 or 25), and co-synchronous using frame sync or simi-
lar means. In practical application, both inputs should be frame-synchronized
using a common frame reference, with the same reference also to be used by
this card.