Extron electronic RGB 118 PLUS user manual A-4

Page 23

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.

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

Page A-4

Page 22 Page 23
Image 23
Page 22 Page 23
Contents RGB 118 & RGB 118 Plus Computer-Video Interfaces Contents Following icons may be used in this manual Introduction to the RGB 118 & RGB 118 Plus Introduction About This Manual RGB 118 & RGB 118 Plus Facts and FeaturesFeatures Frequency SpecificationsInput Signal RGB 118 and RGB 118 PlusOperation of RGB 118 & RGB 118 Plus Front Panel Top Panel Internal DIP Switches Using the SRIAnalog Operation of RGB 118 and RGB 118 Plus Front PanelTop Panel Opening the RGB 118 or RGB 118 Plus Case Internal DIP SwitchesChanging a Switch Setting Setting Internal DIP SwitchesOperation Using the SRI RGB 118 Plus only RGB 118 & RGB 118 Plus Applications Applications RGB Application DiagramsRGB 118 Plus Extron Switcher Universal Interface RGB 118 PlusOther Reference Material Computer Compatibility and MBC Cables Extron Part Glossary A-4
Top Page Image Contents