Grass Valley 8995DNC v.1.3.0 - Manual (Page 30)

30 8995UPC/DNC/UDX — Instruction Manual
Configuration
Cadence controls are present for selecting between two modes to handle
automatic cadence detection in video created from film. The first (and
default) choice is
Auto Film/Video (3:2 or 2:2 pull down). Video created from film
that has a 1/23.98 Hz capture interval must use a process called 3:2 pull
down to produce video fields at 1/59.94 Hz intervals.
If artifacts occur in Auto Film/Video (3:2 or 2:2 pull down mode, automatic
cadence detection may be disabled by selecting the second choice, Fixed
Video (2:2 pull down) mode. In this mode, the de-interlacer to performs
motion-adaptive de-interlacing assuming only a 2:2 cadence in the video,
reducing the chance of distortion related to cadence detection.
Aspect Ratio Controls
Aspect ratio controls are provided on this module for changing various
characteristics of the output image after an up or down conversion using
the mode, alignment, position, and crop controls (when applicable).
The module also detects and reports whether Active Format Description
(AFD) information is present on the input/output signal. The AFD Input
and Output Status sections report the presence of AFD, the AFD Input and
Output Line, the Input and Output Aspect Ratio (4:3 or 16:9), and the AFD
Input and Output AFD code.
The AFD Input and Output codes are defined as 4-bit binary numbers.
Each 4-bit code describes a video picture in terms of aspect ratio and other
characteristics of the active image based on the SMPTE 2016-1:2009 and
2016-3:2009 standards.
When present, AFD processing can be disabled in the AFD Control section
if desired. When disabled, AFD reporting information will remain on the
web page but will be bypassed when the aspect ratio controls are used. The
aspect ratio controls will act on the video output in the same manner as
when no AFD is detected or AFD is disabled as described in
Aspect Ratio
(No AFD or AFD Disabled) on page 31 .
The following sections describe using the aspect ratio controls on signals
with and without AFD:
Aspect Ratio (AFD Present)
When AFD is present on the input and AFD is enabled, the aspect ratio con-
trols will change the output as defined by specific software programming
designed to meet the requirements of the SMPTE 2016-1:2009 and
2016-3:2009 AFD code standards.
AFD input and output codes are defined in the Appendix section: Active
Format Description on page 117 . This Appendix provides detailed defini-
tions of the binary codes and how the AFD codes respond to the aspect
ratio settings made on the web page when AFD is present.