DVI (Digital Visual Interface) is a digital display interface which uses a digital cable. When using the VGA interface (analog cable) the digital image requires a double conversion. The digital image from the image source must first be converted to analog, the resulting analog signal is passed through an analog cable, and the received signal at the display device is converted back to digital.

This process results in a loss of data and picture quality distortion. DVI transfers the digital image in a digital format from the image source to the display device, resulting in a sharper an crisper picture quality. All conversions between digital and analog, and their associated distortions, are eliminated. With DVI, it is possible to output signals from VGA to SXGA and beyond! In compliance with many new projectors and LCD monitors, all of the WolfVision Progressive Scan models have a DVI interface. It is recommended that you use DVI as much as possible as the image quality is superior!

However you have to be aware of two limitations when using a DVI connection with a WolfVision Visualizer:

• The cable length is limited to 5 meters (15 feet) according to the DVI standard
  (additional devices have to be used for longer cable runs)
• The analog signal coming from the VGA (D-Sub)-input of the Visualizers can not be output on the digital section of the DVI output of the Visualizers (thus EXT/INT switching is only available if the analog section of the DVI output is used).

There are two types of DVI connectors:

DVI-I (This one is used on WolfVision's Progressive Scan Visualizers)	DVI-D
The signal is output in digital and analog format. You may switch on your display device (monitor, projector) if you want to use the digital or analog section of the DVI input. Of course the quality is much better with the digital section. The only advantage when using the analog section is that the EXT/INT function of the Visualizer is available, but the picture quality is not better than when using a S-SUB (SVGA/XGA/SXGA) connection.	This is a digital only connection. The 4 pins for the analogue signal are missing. However display units with DVI-D plugs can also be used with a WolfVision Visualizer.

HDMI (The new connector for HD (High Definition))

HDMI - the new connector for HD (High Definition)-signals is 100% compatible with DVI.

HDMI connectors have additional pins for sound and can also transfer HDCP copyright protection signals. Of course both are not necessary for a Visualizer, so a simple cable with a DVI connector on one end and a HDMI-connector on the other end connects WolfVision Visualizers to display devices with HDMI input.