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Operation

58 Runco RS-1100 Series Owner’s Operating Manual

PRE

IMINAR

• Signal Fine Tune: This sub-menu displays current input signal timing information and

provides the following advanced settings.

• Clamp Place: “Clamping” refers to the removal of any DC offset from the analog

input signal so that it can be accurately digitized. Clamping normally occurs a short

time after the trailing edge of the horizontal sync signal (H-sync), when the video

source is known to be producing black. The analog-to-digital converter in the

RS-1100 uses the input signal at this point as its black level reference and

processes all other signal levels accordingly.

Clamp Place is the number of pixel periods (1 to 255 inclusive) that should pass after

the trailing edge of H-sync before clamping starts. If images from an HD source

appear excessively dim, try adjusting the Clamp Place to correct this.

• Clamp Duration: Clamp Duration is the number of pixel periods (1 to 255 inclusive)

for which clamping is active. For best results, set the clamp duration to include the

majority of the black reference signal time that follows the H-sync signal trailing

edge. Increase the Clamp Duration if you see brightness changes at the top of the

screen and/or slow recovery from large changes in the average picture level (APL),

or brightness.

• Pre-Coast/Post-Coast: With some HD sources, H-sync may become distorted or

disappear altogether during the vertical sync (V-sync) pulse period. With composite

sync or sync-on-green RGB signals, H-sync may contain equalization pulses or

other distortions during V-sync.

To maintain proper signal timing, such distortions should be ignored; otherwise,

“tearing” of the image at the top of the display may result. The solution is to employ

“coasting,” which allows the pixel clock to free-run at its then-current frequency. It

can do so for several lines without significant frequency drift.

Pre-Coast sets the number of H-sync periods that Coast becomes active prior to

V-sync. Post-Coast sets the number of H-sync periods that Coast stays active

following V-sync. Increase one or both settings to correct jitter or instability in the

image.

• SOG (Sync-On-Green) Threshold: SOG Threshold adjusts the voltage level of the

RS-1100 Sync-on-Green signal detection circuitry. Adjust the SOG Threshold if an

image from a “sync on green” RGB source is unstable or won’t display at all. Higher

settings lower the SOG detection threshold in 10-millivolt steps; lower settings raise

the threshold. The range is from 0 (330 mV) to 31 (10 mV) inclusive. The default

setting is 23 (100 mV) and should rarely require adjustment.

• Overscan Rate: Refer to Image Over Scan on page 59.

Timing 1080ix60

Clamp Place +80

Clamp Duration +10

Pre-Coast +10

Post Coast +5

SOG Threshold +23

Overscan Rate +2

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