What is a computer?

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Computer Notes for Grade 11 final copy

Automatic Teller Machine (ATM)
OUTPUT DEVICES AND MEDIA

Voice recognition-Voice input is the process of entering data by speaking into a microphone that is attached to the sound card on a computer. Voice recognition is the computer’s capability of distinguishing spoken words. Most voice recognition programs use speaker-independent software, which has a built-in set of word patterns which is used to identify what is spoken.

TERMINALS/DISPLAY TERMINALS/VIDEO DISPLAY TEMINALS

Terminals consist of a keyboard and a monitor screen. Two common terminals are:

Point –of-sale (POS) Terminal is a special purpose terminal that allows data to be entered when a transaction with a customer occurs, such as at a fast food, restaurant, or at hotels. POS serve as input to computers located at the place of business or elsewhere. The data entered is used to maintain sales records, update inventory, make automatic calculations such as sales records, update inventory, verify tax etc. POS are designed to be easy to operate, requiring little technical knowledge (keys are labeled to assist the user).

Automatic Teller Machine (ATM)

An ATM is a terminal specially designed for self-service banking. A typical ATM has the following input and output devices.

Input devices:

A card reader: to capture the account information stored on the magnetic strips of the users' plastic cards.

A keypad: to allow the users to enter transaction information.

MULTIMEDIA INPUT DEVICES

Is the combination of sound and images with text and graphics? To capture sound and image data, special input devices are required.
OUTPUT DEVICES AND MEDIA
Output Devices are used to transmit data and information from the computer to the user. There are two main categories of output devices. Hard Copy and Softcopy output devices.

Hard copy is output that is tangible, ie. It can be physically handled such as output on paper or other physical medium.

Soft Copy is intangible output. It can be seen but not physically handled, such as output on a monitor.

oft Copy Devices
Monitors

A monitor displays text and image data passed to it by the computer.

A cathode-ray tube (CRT) monitor is the type that has been around for years and is large and boxy. CRT monitors are heavy and they take up a lot of desk space. They have largely been replaced by flat-screen monitors. However some are still used in the design industry since the colour accuracy and brightness of CRT monitors is excellent, and designers need to see true-to-life colours. Also, CRT monitors are generally cheaper than flat-screen monitors.

Flat-Screen Monitor (TFT or LCD)

Flat-screen displays have replaced CRT monitors. Flat-screen monitors are light in weight and they take up very little desk space. Modern flat-screen monitors have a picture quality that is as good as CRT monitors. TFT and LCD are two of the technologies used in flat-screen monitors: TFT is Thin-Film-Transistor, and LCD is Liquid-Crystal Display.

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