OmniTek OTR 1001, Руководство пользователя

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Q-20 OmniTek OTR 1001 User Guide, v3.1
Q.10 Adding Deliberate Bit Errors
When testing video production and distribution equipment, it can be useful both to test its
response to video signal errors and to examine how well it recovers from such events.
To aid such testing, the OTR 1001 includes the option to insert deliberate pixel bit errors into the
video signal that is output from either SDI Output 1 or SDI Output 2 of the OTR. These errors
can be inserted either into the active video or the blanking as required. There is also the option to
insert errors into the video bitstream as it comes out of the SDI bit scrambler to mimic bit errors
introduced in the cabling.
Bit errors can be introduced at a range of rates from every pixel to once every frame or once in
several frames depending on the selected output video standard.
Where simultaneous monitoring of SDI Input 1 and SDI Input 2 is enabled (see Section O), it is
possible to set up the OTR to display (for example) the results of passing the video signal
containing the errors through the equipment under test alongside the results of passing a copy of
the same video signal through a reference system.
Control Panel Mouse & Keyboard
To add bit errors to the video bitstream that is played out:
1. Call up the Properties control window.
2. Fully open the SDI Output section of the Properties control for the output on which you
want the bit errors to be inserted.
3. For each output on which you want to generate bit errors, tick the Bit Error Inserter tick
box and set the rate at which you want bit errors to be inserted and where you want these
errors to be inserted.
Rate: The rate setting defines the required number of ‘good’ pixels between inserting ‘bad’
pixels. Values between 0 and 4194303 can be set. A value of 0 specifies that every pixel
should be corrupted. The upper limit is large enough to allow the gap between bad pixels to
be more than a frame even where 3G video standards are being used.
Active Video: Ticking this option allows bit errors to be included in the active video part of
any frame.
Blanking: Ticking this option allows bit errors to be included in the blanking (where it can
potentially corrupt both standard markers such as EAV, SAV and TRS codes and embedded
data such as ANC codes).
Post Scrambler: Ticking this option allows errors to be introduced after the signal has
passed through the SDI bit scrambler. Note: In this case, the errors may affect either the
active video or the blanking because, after scrambling, it is not possible to determine which
part of the video bitstream any pixel comes from.