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CCMatch™ Scenario 2:
Scenario 2 allows CCMatch™ to be used in tandem with an externally delayed video/audio input
(See Figure 2). This Scenario would be ideal if you are looking to make use of an existing delay
source, for instance, an intentional broadcast delay for censoring live material. Unlike Scenario 1,
this option requires that the HD491 have two input video feeds – both a Master and Auxiliary. The
video on the Master input should be a delayed copy of the same video being fed on the Auxiliary
input. The delay of the Master in respect to the Auxiliary approximates the anticipated delay of
real-time captioning and CCMatch™ re-times the captions according to this delay (The Master
output of the HD491 will contain the same video delay present in the Master input).
Figure 2: Workflow for HD491 Smart Encoder with external delay and CCMatch™ option enabled
Enabling CCMatch™ Mode
Enabling CCMatch™ mode requires configuration through the HD491's front-panel LCD menu.
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Browse to the System Setup menu, and choose the CCMatch option.
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You will then be provided with two submenu options Delay Source and Delay Length.
Delay Source requires you to choose either Internal or External – choose according to the
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scenario being used (Internal for Scenario 1, and External for Scenario 2).
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Delay Length requires the input of a numeric value from 0.0 to 10.0 seconds (in increments
of 0.1 seconds). Enter the length of the desired delay as follows:
o For CCMatch™ Scenario 1: Enter the number of seconds you would like
CCMatch™ to delay input and synchronize captions according to.
o For CCMatch™ Scenario 2 - enter the number of seconds of delay present in your
Master video input, with respect to the Auxiliary input (the number of seconds
entered must match the delayed input).
For each scenario, the delay is likely to be between 3 and 8 seconds, consisting of a transcription
delay of approximately 3 seconds, and an audio transmission delay that can be nearly as low as
zero, or as high as 5 seconds, depending on the means of audio delivery to the captioner.
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HD491 Smart Encoder
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