Functional Description - evertz 7735CEM Manual

7700 MultiFrame Manual
7735CEM Composite Encoder with Monitoring
The Features of "-A4" option are:
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One group (4 channels) of synchronous 20-bit audio is de-multiplexed from the incoming digital video.
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2 unbalanced AES audio inputs (up to 48kHz, 24 bits) on BNC.
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User selects EITHER the de-embedded audio or the input AES audio.
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The selected audio is delayed equivalently to the video delay with the +S option.
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4 high quality 24 bit audio channels are output (analog) as balanced on 2 removable barrier strips.
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Low impedance outputs (66Ω).
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Analog audio output levels are adjustable.
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Additional audio delay of up to 5 seconds.
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Additional audio advance of up to 1 frame, depending on video delay.
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Loss of video modes: pass audio, mute audio.
The Features of "-AES" option are:
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75-Ohm coaxial (unbalanced) AES inputs (2) on BNC.
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Audio delay equivalent to video delay (with +S option).
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Additional audio delay of up 5 seconds.
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One group (4 channels of audio) is de-multiplexed from the incoming digital video.
•
2 unbalanced AES audio outputs.
•
Loss of video modes: pass audio, mute audio
•
Bypass relay protection that allows removing the card without re-wiring AES 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.
Digital audio is de-multiplexed from the incoming SDI video. External digital AES audio is also received via
input BNC's. 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 7735CEM-AES, this delayed audio is
formatted properly and delivered to the user as unbalanced 75 Ohm AES audio on BNC. On the
7735CEM-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.
7735CEM-2
Gray background indicate un-implemented or un-tested features
Revision 1.1.1