Glossary

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Synchronization

The signals output from computers have a specific frequency. If the projector frequency does not match this frequency, the resulting

 

images are not of a good quality. The process of matching the phases of these signals (the relative position of the crests and the troughs in

 

the signal) is called Synchronization. If the signals are not synchronized, flickering, blurriness, and horizontal interference occur.

 

 

Security slot

The security slot is compatible with the Microsaver Security System manufactured by Kensington. You can find details about the

 

Microsaver Security System on the Kensington homepage http://www.kensington.com/.

 

 

Tracking

The signals output from computers have a specific frequency. If the projector frequency does not match this frequency, the resulting

 

images are not of a good quality. The process of matching the frequency of these signals (the number of crests in the signal) is called

 

Tracking. If tracking is not carried out correctly, wide vertical stripes appear in the signal.

 

 

Dolby Digital

A sound format developed by Dolby Laboratories. Normal stereo is a 2-channel format that uses two speakers. Dolby Digital is a 6-

 

channel (5.1-channel) system which adds to this a centre speaker, two rear speakers, and a sub-woofer.

 

 

Progressive

A method of image scanning whereby the image data from a single image is scanned sequentially from top to bottom to create a single

 

image.

 

 

Refresh rate

The light-emitting element of a display maintains the same luminosity and colour for an extremely short time. Because of this, the image

 

must be scanned many times per second to refresh the light-emitting element. The number of refresh operations per second is called the

 

Refresh rate and is expressed in hertz (Hz).