Sync Generator - LZX Visual Cortex Technical Manual

SYNC GENERATOR

The Sync Generator section is a broadcast specification video sync generator which can operate in
NTSC/480i or PAL/576i timing formats. It can provide the master timing reference for an entire video
synthesizer system, and its timing may be synchronized to an external video source.
Frontpanel
A. Sync Format LED Indicators. Indicates NTSC or PAL mode.
B. Sync Lock Status LED Indicator. Green when locked to external sync, red
when external sync is detected but no lock can be achieved.
C. Horizontal sync output jack. A pulse at the beginning of each video scanline.
D. Vertical sync output jack. A pulse at the beginning of each video field.
E. Frame rate clock output jack. A gate is turned on at the beginning of each odd
field (the start of a new frame), and off at the beginning of each even field.
F. Dither pattern output. A dithered pixel texture for shading video objects. The
spatial geometry of the texture is influenced by the selected Ramp Generator
modes.
Rear
A. Video format selection switch. Selects between NTSC/480i and PAL/576i video formats.
B. External sync source selection switch. Selects between Input Decoder or rear Sync In
C. Sync In jack. A video input for external synchronization.
D. Sync Out jack. A black video output containing only synchronization pulses.
E. 14-pin LZX Sync Distribution Bus output. A 14-pin sync output for providing sync to previous LZX
Industries products which require it.
F. Sync-to-Power Bus selection switch. When on, these switches send horizontal and vertical sync
pulses to the CV and Gate pins on the 16-pin power connector.
Block Diagram
6
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(C)