Side-Power 8981 Manuál s instrukcemi stáhnout pdf (Strana 18)

12 8981FS Instruction Manual

8981FS Digital Frame Synchronizer Module

Input Signal EDH Detection

The module monitors its video input signal for EDH (Error Detection and

Handling) checkwords. If checkwords are present, active picture only or

full ﬁeld input signal errors will cause the front of module FAULT indicator

to illuminate brieﬂy each time an error is detected. The EDH Error Mode

control function determines whether ACTIVE PICTURE or FULL FIELD

errors will cause the indicator to illuminate. (See Table 3 on page 15, Func-

tion Switch positions 6, Bank 1) New EDH checkwords per SMPTE RP165

are always inserted into the module output signal. The EDH Error Mode

setting will have no effect on the new EDH checkwords inserted at the

module output.

Manual Freeze and GPI

Freeze mode can be manually initiated when operating either as a frame

sync or ﬁxed delay. It can be used to provide a frame or ﬁeld grab for pro-

duction applications. Freeze can be triggered using the GPI input BNC con-

nector or using the 8900 series remote control system. When operating in

delay mode, a stable input signal must continue to be present to produce a

stable freeze output.

The selection of which type of freeze (Frame, Field 1, or Field 2) can be

made via the Frame/Field Select and F1/F2 control functions. (See Table 3

on page 15, Function Switch position A and B, Bank 1).

The GPI connection is a dual function connection. It can be used as both an

output to drive a remote LED to indicate when the module is in the freeze

mode and as an input that can control the freeze mode (see GPI Freeze

Trigger Circuits on page 25 for control wiring required to use the GPI con-

nector).

The GPI control input must be ENABLED using the Freeze GPI mode set-

ting. (See Table 3 on page 15, Function Switch position B, Bank 2).

SEE GPI Freeze Trigger Circuits on page 25 for more information on GPI

circuit design and operation.

Signal Processing — Offset and Gain

If video signal levels need to be adjusted, the video signal level controls

must be activated by setting the Video Signal Levels mode setting to VARI-

ABLE. (See Table 3 on page 15, Function Switch positions E, Bank 1) If this

mode setting is in the UNITY position, the video signal levels will be ﬁxed

at unity gain and with no black level offset. If VARIABLE is selected, offset

and gain adjustments can be made for each component video channel— Y,

B-Y, and R-Y. Offsets are adjustable ±31 least signiﬁcant bits (10-bit video).

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Side-Power 8981 Manuál s instrukcemi Strana 18