Grass Valley Kaleido-X v.7.80 - Manual (Page 134)

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Calibrating the Kaleido-X
Key Concepts
Metadata holding
time The holding time parameters determine the delay after which decoded
metadata such as closed captions, teletext subtitles, or XDS metadata
will be cleared. Requires the CC/XDS option (see
Hardware and Software
Options on page 463). Refer to Calibrating Metadata Holding Time , on
page 150 for details.
Zero VU (dBu) The Zero VU (dBu) parameters determine the reference level to be
applied to the selected analog input signal, from an Audio Bridge
Terminal (ABT). Its default value is 4 dBu, on a range of -24 dBu to 8 dBu.
See
Calibrating Zero VU Reference Level for an ABT Audio Source on
page 145.
Zero VU (dBFS) The Zero VU (dBFS) parameters determine the reference level to be
applied to the selected digital (embedded, or from ABT) audio signal.
dBFS stands for decibels full scale. Zero dBFS corresponds to the
maximum possible level. By default the reference level for a it is set to
-20 dBFS, on a range of -24 dBFS to -8 dBFS. The extraction of digital
audio requires the KXS-HD-EMB or KXS-SD-EMB option (see
Hardware
and Software Options on page 463). Refer to Calibrating Zero VU
Reference Levels for Embedded Audio Sources , on page 144 for details.
Audio program In the case of Kaleido-X16 and Kaleido-X with second-generation input
cards (KXI-16SV rev. 600 and later, KXI-16HS3, and KXI-16HSV3), you can
define up to two groups of audio channels, for each video input—each
group, itself, constituting an audio program. Loudness measurement is
based on audio program calibrations for these multiviewer models.
See
Configuring Audio Programs on page 137.
Audio loudness A measure of the perceived loudness of a group of audio channels (an
audio program). Various measurement modes are available depending
on the hardware being used. It is possible to configure an alarm that will
be triggered when the measured loudness deviates too far from a target
specified either by a standard or by your organization.
In the case of the Kaleido-X, and Kaleido-X16 multiviewers, an alarm can
also be triggered when the measured loudness deviates too far from the
dialnorm value found in the VANC audio metadata (SMPTE ST 2020-A).
Depending on the hardware, the loudness measurement mode will
either be:
• Compliant with recommendations from Dolby regarding dialog
loudness measurement (ATSC A/53) and provide a short term value
referred to as loudness, with a limit of one measurement per video
channel. This applies to Kaleido-X with first-generation input cards (KXI-
16SV rev. 599 and earlier, KXI-16HS, and KXI-16HSV), only.
See
Calibrating Dolby Dialog Loudness Measurement on page 141.
OR,