Miranda NV5100MC Master Control, Справочное руководство

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NV5100MC Master Control • Reference Man ual 55
4. MCPMs
MCPM Architecture
Several non-normal conditions can exist:
• The emergency bypass relay trips. What happens can vary. The MCPM will typically send
emergency bypass video (with its original embedded audio, if any) onto program output.
If the MCPM has BNC connectors for AES, the relay will switch the bypass audio inputs to
program audio output.
(The relay will also trip when the MCPM loses power.)
• The preset video is non-synchronous (has lost reference) and the MCPM bypasses normal video
processing, presenting the original video (with its original embedded audio if it exists) at the
preview output.
• The program video is non-synchronous (has lost reference) and the MCPM bypasses normal
video processing, presenting the original video (with its original embedded audio if it exists) at
the program output. When this happens, the clean-feed output is the same original video as the
program output.
• LOS (loss of signal) on program source. The program output and clean-feed output display a
pre-defined matte value.
• FTB. An operator or automation system fades program output to FTB matte (which need not be
black). The clean-feed output will also fade. (Audio fades to silence in the same period.)
Video Summary
Main video sources may contain audio and the MCPM can disembed the audio. As a transition
occurs, the preset main source and the program main source are mixed, video effects are applied in
layers, and the results appears at program output, preset output, and clean-feed output. Audio is re-
embedded (with overs mixed) prior to output.
When the video is non-synchronous, it does not undergo any processing, but feeds the output
directly, whether program or preset. If the MCPM detects LOS for the program source, it outputs a
predefined matte.
An operator (or automation) can apply a fade-to-black (FTB) to program output unless the program
main source is non-synchronous, in which case program output
cuts to matte.
Audio Processing Section
When an operator or automation chooses a video source for preset or for program, the MCPM
selects its associated audio inputs also.
Audio can either be disembedded from the video source or it can be discrete (present on a connec-
tor). Discrete audio can be analog or AES. Any audio input can be Dolby E encoded if the MCPM
has a Dolby E decoder.
S
Dolby E requires a non-interlaced video reference format. Dolby E works with 720p video
sources when the reference is 525i, 625i, or 1080i.
The audio crosspoint accepts discrete audio inputs directly and accepts embedded audio after it
passes through a disembedder. Each disembedder produces 8 channels: 4 AES pairs, as shown in
Figure 4-9.
Discrete audio inputs are “stereo” inputs. The MCPM treats the separate stereo channels as distinct.
During MCPM configuration, you can select any of up to 256 single, a.k.a. “mono,” channels at
any time.