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Computer Output Device: Speakers

Principle purpose of this lecture is to present on Computer Output Device: Speakers. Computer speakers, or multimedia speakers, are external speakers, commonly equipped with a low-power internal amplifier. The standard audio connection is a 3.5 mm (1/8 inch) stereo jack plug often color-coded l.....

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Computer Output Device: Visual Display Unit

Major purpose of this lecture is to present on Computer Output Device: Visual Display Unit. A monitor is a peripheral device which displays computer output on a screen. Screen output is referred to as soft copy. For example, a flat panel display and a projector are both examples of VDUs. Her.....

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Computer Output Device: Dot-matrix Printer

The aim of this lecture is to present on Computer Output Device: Dot-matrix Printer. This has a print head that travels across the paper. The head has a set of pins which are pushed out to form the shape of each character. The pins hit an ink ribbon against the paper as the print head moves a.....

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Computer Output Device: Printers

A computer printer, or more commonly a printer, produces a hard copy (permanent human-readable text and/or graphics) of documents stored in electronic form, usually on physical print media such as paper or transparencies. Many printers are primarily used as local computer peripherals and are atta.....

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Computer Input Device: Webcam

Webcams are small cameras, whose images can be accessed using the World Wide Web, instant messaging, or a PC video conferencing application. The term webcam is also used to describe the low-resolution digital video cameras designed for such purposes, but which can also be used to record in a non-.....

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Computer Input Device: Digital Camera

Digital camera is a camera that takes video or still photographs, or both, digitally by recording images on a light-sensitive sensor. Many compact digital still cameras can record sound and moving video as well as still photographs. In the Western market, digital cameras outsell their 35 mm fil.....

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Computer Input Device: Electronic Point of Sale

Prime purpose of this lecture is to present on Computer Input Device: Electronic Point of Sale. Point of sale or point of service (POS or PoS) can mean a retail shop, a checkout counter in a shop, or the location where a transaction occurs. More specifically, the point of sale often refers to t.....

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Computer Input Device: Microphone

Basic purpose of this lecture is to present on Computer Input Device: Microphone. A microphone, sometimes referred to as a mike or mic, is an acoustic to electric transducer or sensor that converts sound into an electrical signal. Microphones are used in many applications such as telephones, t.....

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Computer Input Device: Optical Mark Reader

Optical Mark Reader is a reader that detects marks in a certain position on a piece of paper. In this method, special printed forms are designed with boxes which can be marked with a dark pencil or ink. Each box is annotated distinctly so that the user clearly understands what response he/she mar.....

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Magnetic Ink Character Reader

General purpose of this lecture is to present on Magnetic Ink Character Reader. It is a technology used to verify the legitimacy or originality of paper documents, especially checks. It’s those mysterious, funny characters at the bottom of a check, sometimes referred to as the MICR line. The.....

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Optical Character Recognition

Optical Character Recognition or OCR is the process where images of letters can be entered into the computer as data using a scanner or other hardware device. Some examples of how an OCR may be used would be a company that has hard copies of manuals or other company information and wanting to co.....

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Bar Code Readers

The aim of this lecture is to present on Bar Code Readers. A barcode reader (or barcode scanner) is an electronic device for reading printed barcodes. Like a flatbed scanner, it consists of a light source, a lens and a photo conductor translating optical impulses into electrical ones. Additiona.....

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