Sony DFS-700, DFS-700P Turning a Downstream Key On and Off

Timing of the GPI signal

The timing of the GPI signal from the editing control unit is as follows.

VCRs start		IN point		Effect start point			OUT point VCRs stop
Player A
Player B
Recorder
GPI signal
				3 frames
PGM OUT							Foreground bus
signal			Background bus image				image
	Preroll				Execution of			Postroll
					effect (transition)
				A-roll period		B-roll period

Timing of GPI signal in A/B roll editing

Turning a Downstream Key On and Off

If in page 1 of the setup menu you have set F3(PORTS) to “PVE-500” or “GPI” then you can turn a downstream key on and off using a GPI signal input to the T2 connector on the DFS-700/700P.

As shown below, the downstream key is turned alternately on and off at the falling edge of the GPI signal.

GPI signal

	3 frames		3 frames
DSK ON		DSK OFF

Turning a downstream key on and off — GPI signal timing

Editing From Control 5 Chapter Units Control

Chapter 5 Control From Editing Control Units 5-13