Saturday, December 31, 2011

VGA

VGA port


VGA connector




The term Video Graphics Array (VGA) is a high-resolution video standard used mostly for computer monitors, where ability to transmit a sharp, detailed image is essential. VGA uses separate wires to transmit the three color component signals and vertical and horizontal synchronization signals.

VGA refers specifically to the display hardware first introduced with the IBM PS/2 line of computers in 1987, but through its widespread adoption has also come to mean either an analog computer display standard, the 15-pin D-subminiature VGA connector, or the 640×480 resolution itself.


VGA card


VGA card on motherboard

Friday, December 30, 2011

Scanner

Scanner


A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources and converts it to a digital image for computer editing and display . Scanners have become an important part of the home office over the last few years. Mechanically driven scanners that move the document are typically used for large-format documents, where a flatbed design would be impractical.

Wednesday, December 28, 2011

Headset


Headset

Headset



A headset is a headphone combined with a microphone. Used in call centers and by people in telephone-intensive jobs, headsets provide the equivalent functionality of a telephone handset with hands-free operation. Many people use headsets at the computer so they can converse and type comfortably. Headsets typically have only one speaker like a telephone, but also come with speakers for both ears.





Bluetooth headset

Modem



Modem (from modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. A modem is a device that allows a computer to communicate over a network. Short for modulator-demodulator. A modem is a device or program that enables a computer to transmit data over, for example, telephone or cable lines. Computer information is stored digitally, whereas information transmitted over telephone lines is transmitted in the form of analog waves. A modem converts between these two forms.





Tuesday, December 27, 2011

Computer speakers

Logicool aka Logitech Launches the LS11 & LS21 Computer Speakers



Computer speakers, or multimedia speakers, are external speakers, commonly equipped with a low-power internal amplifier. The standard audio connection is a 3.5mm (1/8 inch) stereo jack plug often colour-coded lime green (following the PC 99 standard) for computer sound cards.A plug and socket for a two-wire (signal and ground) coaxial cable that is widely used to connect analog audio and video components. Also called a "phono connector," rows of RCA sockets are found on the backs of stereo amplifiers and numerous A/V products. The prong is 1/8" thick by 5/16" long. A few use an RCA connector for input. There are also USB speakers which are powered from the 5 volts at 200 milliamps provided by the USB port, allowing about half a watt of output power.