A modem modulates outgoing digital signals from a computer or other digital device to analog signals for a conventional copper twisted pair telephone line and demodulates the incoming analog signal and converts it to a digital signal for the digital device.
The most familiar example is a voiceband modem that turns the digital ‘1s and 0s’ of a personal computer into sounds that can be transmitted over the telephone lines of Plain Old Telephone Systems (POTS), and once received on the other side, converts those 1s and 0s back into a form used by a USB, Serial, or Network connection....
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HDTV short for high definition television is a television display technology that provides picture quality similar to 35 mm. movies with sound quality similar to that of today’s compact disc. Some television stations have begun transmitting HDTV broadcasts to users on a limited number of channels. HDTV generally uses digital rather than analog signal transmission. However, in Japan, the first analog HDTV program was broadcast on June 3, 1989. The first image to appear was the Statue of Liberty and the New York Harbor. It required a 20 Mhz channel, which...
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The Mini HDTV USB is an add-in USB device that turns your computer into an HDTV Theater. If you still have analog Cable TV in your house you can also use the Mini HDTV USB to receive normal TV and Cable broadcasts in addition to HDTV broadcasts.
A HDTV USB allows you to:
Record TV programs to your hard drive
Easily trim and cut commercials from captured TV programs.
Burn Recorded TV to DVD or CD
Transfer TV Files To Your iPod/PSP
Schedule TV recordings
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An amplifier is any device that will convert a signal with a small amount of energy into a similar signal with a larger amount of energy. In popular use, the term today usually refers to an electronic amplifier, often as in audio applications. The relationship of the input to the output of an amplifier — usually expressed as a function of the input frequency — is called the transfer function of the amplifier, and the magnitude of the transfer function is termed the gain.
Amplifiers are used in wireless communications and broadcasting, and in audio equipment of all kinds. They can...
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Resolution is the number of pixels that are used to draw an image on the screen. If you could count the pixels in one horizontal row across the top of the screen, and the number of pixels in one vertical column down the side, that would properly describe the resolution that the monitor is displaying.
Resolution is given as two numbers. If there were 800 pixels across and 600 pixels down the side, then the resolution would be 800 X 600. Multiply 800 times 600 and you’ll get the number of pixels used to draw the image (480,000 pixels in this example)....
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A lumen is a measure of the quantity of light emitted from a constant light source across one square meter. It symbol is lm.
A lumen describe how much light is contained in a certain area. The lumen is part of a group of standard measurements known as the photometry group, which measure different aspects of light.
Lumens are the most common measurement term used for describing light output from a projector.
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