Fresnel Screen (projection TV) - Helps balance out the light of the image across the screen. Without this screen, there would only be a centre screen bright spot. This screen receives the initial light image from the mirror and is made up of grooves, not unlike the grooves on an original LP record, in a circular pattern.
PSIP data - (Program and System Information Protocol) - This data is arranged as a table with multiple sub-tables. The data identifies the station name, what the sub-channels are, the program name, the following programs, content advisories, language options, and caption options. Some of this data is transmitted as often as 7 times per second.
Stylus - A pen writing device for the handheld computer. Used with touch-screens to initiate commands with the operating system and also to input data.
CD-R - Recordable Compact Disc used as a digital audio recording media. Compatible with standard CD players.
Bandwidth - The range of frequencies used to transmit the television signal, including picture and sound. Analog television signals have been allocated at 6 Megahertz for each over-the-air channel. Digital channels are allocated the same 6 Megahertz by Industry Canada. However, by the use of digital compression, a combination of up to 5 SDTV programs and/or one HDTV program can be carried in this 6 MHz digital channel.
Encryption - The process of coding signals so that a specific code or key is required by the viewer to recover the data so encrypted. Without this key, the data is meaningless. Encryption is used to provide conditional access for private television services.
Multicasting - The option to multicast was made possible by digital technology to allow each digital broadcast station to split its bit stream into 2, 3, 4 or more individual channels of programming and/or data services. (For example, on channel 7, you could watch 7-1, 7-2, 7-3 or 7-4.)
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