Tektronix Grass Valley 3000 - Manual (Page 212)

4-74
Section 4— Switcher Operations
Freeze Mode
Freeze selects between “live” and “frozen” pictures. A frozen
picture is like a snapshot you take with a still camera. The
freeze/
unfreeze function toggles between the two states. Press the FRZE
button once to freeze (it high tallies) , press a second time to
unfreeze. When enabled, freeze stops data from being written to
the frame store, resulting in a frozen image.
Frame Store Field Modes
There are a number of video store parameters that may be used
when manipulating frozen images. While a full frame is always
frozen, you can choose to view the image by field instead. The
choices are described below.
Field 1 / Field 2
The FIELD 1 and FIELD 2 buttons determine which field will be
displayed. Either field may be selected, or both may be selected at
the same time. (When unfrozen, the Field buttons have no effect.)
A full frame is always frozen, regardless of the state of these
buttons. This method of storage allows the operator to decide
between fields and frames after the image is frozen.
2 Field / 4 Field
A two-field sequence is the normal default image frozen in the
frame store. However, the memory architecture also allows
storage of a complete four-field color frame. A
FRAME TYPE
button located in the Frame Store/Video Store Menu allows you
to switch between two-field storage mode and four-field storage
mode. 4-field mode stores 2 images. 2-field mode stores 4 images.
Not all of the Frame Store functions are available in four-field
mode, but this mode produces the highest quality video, since
there is no decode/encode processing.