7700 MultiFrame Manual
7736CEM Composite Encoder with Monitoring
Page - 2
Revision 1.5
*Grey background indicates un-implemented or un-tested features
The Features of "-A4" Options are:
•
One group (4 channels) of synchronous 20-bit audio is de-multiplexed from the incoming digital
video.
•
2 unbalanced (or balanced) AES audio inputs (up to 48kHz, 24 bits) on BNC (terminal strip).
•
User selects EITHER the de-embedded audio or the input AES audio.
•
The selected audio is delayed equivalently to the video delay with the +S option.
•
4 high quality 24 bit audio channels are output (analog) as balanced on 2 removable barrier strips.
•
Low impedance outputs (66
Ω
).
•
Analog audio output levels are adjustable.
•
Additional audio delay of up to 5 seconds.
•
Additional audio advance of up to 1 frame, depending on video delay.
•
Loss of video modes: pass audio, mute audio.
1.1.
FUNCTIONAL DESCRIPTION
270Mbps component SDI video is converted to 10 bit parallel data and encoded to high quality composite
analog video. Various video processing functions (gain, saturation, black level, etc) are performed during
the encoding process.
A re-clocked copy of the component SDI video is available on the “SDI OUT” BNC. This output will not be
present if the card is unplugged or the power to the frame is turned off.
Digital audio is de-multiplexed from the incoming SDI video. External digital AES audio is also received via
input BNC's (unbalanced) or removable terminal strip (balanced). The user can select either of these two
sources for further processing. The selected digital audio is delayed (with +S option) to match the delay
experienced by the video in the video synchronizer. In addition, the user can select additional audio delay.
On the 7736CEM-A4, the audio is converted to balanced analog audio through a high quality 24 bit D to A
converter and delivered to the outside world via removable terminal strips.
The audio is also processed to extract level and phase information. The CPU creates the level and phase
bar graphs and writes them out to the on screen display (OSD) memory.
VITC, closed captioning and Source ID are extracted from this input stream. In addition, the video is
monitored for black and freeze conditions. The CPU reads this raw data and extracts time code, program
rating and the closed captioning information. In addition, analysis of the data is performed to determine
fault or error conditions. The time code, program rating, source ID message and faults are also written to
the OSD memory for display on the monitoring output.
This video goes out through two paths; a high quality component to composite converter (composite
encoder) and a monitoring quality composite encoder with the OSD "burn-ins". The hardware mixes
(keys) the on screen text and bar graphs display information onto the monitoring output video stream.
The CPU also gets pushbutton and toggle switch commands from the card edge controls and draws
extensive menus for configuring the operation of the card.
