Extron electronics RGB 118 User Manual download pdf (Page 23)

Extron • RGB 118 & RGB 118 PLUS • User’s Manual

Glossary

Peaking - Peaking compensates for mid and high frequency RGB

Video Bandwidth response in data monitors and projectors and for

signal losses due to cable capacitance. When using the Peak

enhancements on the RGB 118 and RGB 118 PLUS interface,

please use the following guidelines for proper output settings:

__ Use with all computer frequencies between 15-125 kHz at any

cable length.

Use with high frequency computers of 36 kHz or higher with cable

lengths 75 feet or greater.

Serration - A vertical synchronizing pulse divided into a number of

small pulses, each acting for the duration of half a line in a

television system. Serrations are used to keep the horizontal

oscillator synchronized during the vertical sync pulse interval.

Sync - The synchronization signals or timing pulses which lock the

electron beam in step, both horizontally and vertically, with the

image signal. Also called Composite Sync, this signal is derived

from a composite or combination of horizontal and vertical drives,

with some slightly narrowed and delayed pulses, as well as, the

addition of equalizing pulses. It is one of the more popular signals

used in video systems today and when used is usually

accompanied by subcarrier.

TERMINATOR - A resistor at the end of a coaxial cable or line used

to match the impedance of the equipment being used. The

resistor absorbs signal energy to prohibit signal reflections back to

the source. This causes the source equipment to operate as if the

line is connected to equipment of equal impedance.

TTL - Transitor to Transitor Logic. Digital type signal, usually 4-5

volts peak to peak. Distance limitation is 6-10 feet. Signal

splitting is acceptable. TTL signals are either “ON” or “OFF” and

is characteristic of low resolution computers (CGA).

VGA - Video Graphics Array. Introduced by IBM in 1987, VGA is an

Analog signal with TTL level separate horizontal and vertical sync.

The video outputs to a high density 15 pin 3 row “D” type

connector and has a horizontal scan frequency of 31.5 kHz and

vertical frequency of 70 Hz (Mode 1, 2) and 60 Hz (Mode 3). The

signal is non-interlaced in modes 1, 2, 3 and interlaced when

using the 8514/A card (35.5 kHz, 86 Hz) in mode 4. It has a Pixel

x Line resolution of 640 x 480 with a color palette of 16/256,000.

_ For a more complete understanding of Computer Interfacing ask

about Extron’s “Introduction to Computer Interfacing” videocassette.

A training tool designed to provide the experienced or novice sales

person with the most concise information on Computer Interfacing.

Tape length 55 minutes.

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