4DTV - This is a DTV subscription service for C-band and Ku-band (a satellite service requiring an 8 foot dish).
Adjustable Surround Delay - Consists of receivers that incorporate surround sound modes that allow you to adjust a delay time between the front and rear speakers. This delay time resembles a short echo or reverberation in a hall or auditorium. Longer delay times will simulate larger halls. Shorter delay times will simulate smaller halls.
Bluetooth - Technology allowing short-range radio links between mobile devices. Unlike infrared, Bluetooth does not require a clear line of sight to operate properly. Many mobile phones are now Bluetooth-enabled.
GSM - Global System for Mobile Communication: A wireless network system widely used in Europe, Asia and Australia. GSM is beginning to be used more widely in the United States.
PSIP - Acronym for "Program and system information protocol", an ATSC DTV specification that enables a DTV receiver to identify the program information and to create on-screen electronic program guides and content advisories.
Focus Free - Camera lenses can be categorized by the way they deliver the focused image to the film. If the lens is carefully formulated and positioned it will be able to produce sharp images of subjects from about five feet away to the horizon with no manual adjustment.
Dot Pitch - The distance between pixels (picture elements) in a display. In a CRT for HDTV, the dot pitch is typically 0.25 - 0.3 mm. For full resolution HDTV display approximately 1400 pixels are required across the screen.
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