ANIMATION & KEY GENERATOR
The
Animation & Key Generator
section is a multi-function control voltage generator, designed
specifically for controlling transitions between two video images. It can function as a manual controller
with slew, a flip-flop based envelope generator, or a low frequency oscillator. The key function enables a
high-speed comparator, which generates a hard key image suitable for shape generation or luma keying.
Frontpanel
A. Slider control.
Action dependent on mode:
B. In time control.
Sets the speed at which the output
voltage
rises
to the target value.
C. Out time control.
Sets the speed at which the output
voltage
falls
to the target value.
D. LED indicators.
Two color visual indication of target
value and output voltage.
E. Pushbutton switch
. Action dependent on mode:
F. Trigger input jack.
On the rising edge of the input signal, the pushbutton
(E)
action is triggered.
G. Primary Input jack.
Function dependent on mode:
Key Modes Off
Adds to the target value set by the slider control
(A).
Key Modes On
Key generator input source.
H. Primary Output jack.
Output signal dependent on mode:
Key Modes Off
Control voltage output
Key Modes On
High speed video logic output, 0V = low, 1V = high
I. Key mode switch.
Switches between positive key generator mode on (+KEY), key modes off (center)
and inverted key generator mode on (-KEY.) While key modes are on, the internally generated control
voltages become the key generator threshold.
J. Cycle mode switch.
Turns automatic cycling mode on or off.
Block Diagram
Key Modes Off
Sets target value 0-1V
Key Modes On
Sets output amplitude
Cycle Mode Off
Toggles inversion of target value
Cycle Mode On
Resets output waveform
8
