Test Tone - A feature that offers individual adjustment of all four channels (left, centre, right and rear). While in the usual listening position, adjust the relative volume of each channel by using a remote control.
Aperture - The opening within a camera lens system that controls the brightness of the image striking the film. The size of the opening is indicated by the f/number.
Bluetooth® Wireless Technology - Revolutionizes the personal connectivity market by providing freedom from wired connections - enabling links between mobile computers, mobile phones, portable hand-held devices, and connectivity to the internet.
Projection TV Set (PTV) - A term for a big screen TV that uses lenses to project video images on a screen. Rear projection models are one-piece. Front projection systems have a separate projector and screen.
Contrast - The measure of difference between the lightest and darkest values appearing in an image. High-contrast images contain mainly dark values and white values with few steps or tones available in the image.
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.
GPRS - General Packet Radio Service: An always-on system that connects mobile phones to the Internet. Sometimes referred to as 2.5G.
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