To activate an electric motorised screen a 12 Volt output is provided at the rear of the DigiOptic™ Image Processor. This can be connected to a screen interface unit, which can be supplied by screen manufacturers (Fig.10).
Fig.10
The output is activated (Voltage: 12 Vdc) when the Projector is switched on and is
Some manufacturers offer
Fig.11
For rear projection the screen must be translucent. For front projection, we recommend the use of screens with low gain specifications (i.e. 1.3 to 2). The use of high gain screens should be avoided due to their limited viewing angle, which is undesirable for a large audience. Preferably, use a screen
with black,
Avoid light shining directly on the screen during projection as this will reduce contrast and black level detail on the projected image. For the true cinema experience best results are achie- ved with little or no ambient light.
Furniture and other objects with reflecting surfaces, as well as light coloured walls should be avoided, as they are likely to interfere with the screen’s characteristics.
CONNECTING THE VIDEO SOURCES
Connect the cables from the video sources, the serial cable from the external control unit and the optical fibre cables for connection to the Projector, to the rear panel of the DigiOptic™ Image Processor.
To obtain the best performance from the HT500 LINK system, connect the various signal sources using good quality cables designed for video applications (rated impedance 75 
).
Ensure that:
•the cables are routed in such a way that they do not present an obstruction to people moving around the room;
•the connectors are inserted carefully to avoid damaging the pins;
•the cables are not twisted or crushed;
•when disconnecting the cables the connectors are not violently pulled out of the sockets on the various units.
Video sources (television receivers, VCRs, DVD players, etc.) often feature several outputs. To obtain the best performance from your system, carefully choose which output to use. Ge- nerally, the type of signal offering the best picture quality is
However, the HT500 LINK system is equipped with an excellent Video Decoder and Deinterlacer and therefore even inferior quality signals will produce high quality results.
Table 1 shows the types of signals usually available for the most common types of video sources and the corresponding input connectors to use on the DigiOptic™ Image Processor).
11
