Extron electronics Multi Video Processor MVP 104 Operations Instructions download pdf (Page 15)

MVP 104GX Installation 2-7

Genlock connections

A genlock (black burst generator) device can be connected to the MVP 104GX via

the BNC connectors shown below. The genlock feature allows the MVP 104GX to

be synchronized with other system components for seamless vertical interval

switching between sources. See Setting Up Genlock and Vertical Interval Switching in

this chapter.

Figure 2-5 —Genlock connections

Genlock input connector — Connect an external black burst signal to this

BNC connection for genlocking the video signal in broadcast or other sync-

critical applications.

Genlock output connector — Connect any downstream equipment that

requires genlocking to this BNC connector to route the black burst signal

throughout the system in broadcast or other sync-critical applications.

Setting Up Genlock and Vertical Interval Switching

For vertical interval switching (to allow clean switching between signals from

several devices during the vertical blanking period of each signal), a composite

sync signal can be applied at the Genlock In connector, and also passed to another

device via the Genlock Out connector.

If the genlock connectors are used only for vertical interval switching, no horizontal

or subcarrier phase adjustments are required.

Genlock setup

Genlock differs from simple vertical interval switching in that an external device (a

black burst generator) generates a reference sync signal for the system, and every

device that uses that signal has its output signal’s horizontal and subcarrier phases

adjusted to exactly match that of the generator to allow precise timing and full

synchronization. Genlocked systems produce cleaner switches between inputs

than do those without this type of synchronization.

An oscilloscope is required for genlock setup, and a vectorscope is recommended.

Waveform monitors of types other than a vectorscope may give the appearance that

timing is adjusted correctly when it is 180 degrees out of phase, which will result in

incorrect colors or picture artifacts.

All equipment in the system must be powered up and turned on for at least 15

to 20 minutes before genlock setup adjustments can be made and before the

equipment is used in a genlocked application.

REMOTE

RS-232/RS-422

OUTPUT

R 1LR

GENLOCK

OUT

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Extron electronics Multi Video Processor MVP 104 Operations Instructions Page 15