Grass Valley 8964DEC v.1.1.0 - Manual (Page 24)

24 8964DEC/-FS — Instruction Manual
Configuration
Video Timing and Freeze Controls
With a standard 8964DEC module with no Frame Sync enabled the fol-
lowing Line Sync timing adjustment is available:
• Horizontal Timing – adjusts the horizontal delay on the channel output
in pixels. This will add an additional delay of up to one line.
Note For the 8964DEC (Line Sync) model: The timing between the incoming com-
posite video start of lines for all four input channels must be within
± 31
μs ±1μs in relation to start of lines of the black burst external reference to
the module. This is because there is a very short timing zone at ± 32
μs ±1μs
where a line jump in the output timing may be produced after jitter has
occurred or after a power up cycle. To avoid this, make sure the composite
input timing in relation to the external black burst reference is within the safe
zone of
± 31
μs ±1μs for stable output timing.
With an 8964DEC-FS module (8964DEC with Frame Sync enabled, see
Module Option Upgrade on page 60 ), the following Frame Sync timing
adjustments can be made:
• Horizontal Timing – identical to the line sync timing above.
• Vertical Timing – adjusts vertical delay in line increments.
Also available with the 8964DEC-FS are the following freeze controls:
• None – when signal is lost, no automatic freeze occurs and no manual
freeze is activated.
• AutoBlue – when AutoBlue is enabled on a channel, the output will
automatically freeze to a blue screen when the input signal is lost on
that channel.
• AutoFreeze – when AutoFreeze is enabled on a channel, the output will
automatically freeze on the last valid field when the input signal is lost
on that channel.
• Field 1 – manually freezes the output signal on field 1 of the last frame.
• Field 2 – manually freezes the output signal on field 2 of the last frame.
• Frame – manually freezes the output signal on the last frame.
A field freeze provides less resolution and no motion artifacts in the output.
In frame mode, the resolution is higher since both fields are present, but the
presentation of the two fields can cause motion artifacts.