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an audio alert is generated,
the status on the 1RU's front panel is updated, and
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a log file (.psnr or .audio) is created which contains the difference values for the created
recordings. This log file can be dragged/dropped onto ClearView for easy setup and post-anlysis.
It is expected that the incoming signals will drift from each other over time. For example, the delay
between the signals may be 344 frames for a day, 343, for a day, and back to 344 the next. This is due
to several factors including:
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the sources not being genlocked
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the sources changing between national and local feeds
RTM is aware of this and compensates for it using dynamic re-alignment.
The remainder of the screen is devoted to showing the quality over time. The 2 videos are shown side-by-
side after alignment. This is a decimated image and does not necessarily show the entirety of the video
quality. The min/max amplitude of the audio is shown as a meter per channel up to 8 channels.
Several graphs are depicted:
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A Volume activity meter is provided for each audio channel per input
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An LKFS meter is provided reporting Loundness in real-time
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To the right of this metering A/V offset is reported in samples (window), frames and ms
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Video graph is showing the PSNR score over time
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Audio graph is showing the frequency/amplitude of each channel score over time.
RTM reliably detects MPEG breakups, frozen video, lost audio, A/V offset (lip sync) and most typical
causes of impairments found in broadcasts today. The picture below shows each section of the graphical
reporting structure.
Figure 5: Graphs for audio metering, video and audio score running continuously
01/29/2019
Rev.3.0
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