There are Eight More Input Devices
1. Digital Cameras are abit like scanners. They save an image as a series of dots called pixles. You can upload onto the computer and edit using photo-editing software. Benefits - film is not needed. Problem - high resolution imagines use lots of memory and currently use a lot of battery power.
2. Light Pens or Laser Scanners are used in supermarkets and libaries. They are used to read bar codes which contain data about the product. Benefits - it makes buying goods faster and reduces the chance of human error. Problem - the system is expenisve and depends upon the dat in the barcode and the computer system being accurate.
3. Video Digitisers convert analuge video pictures from a videotape or video camera into digital images which can then be manipulated using imaging software. This is called image grabbing. Benefit - Effect can be made that are impossible in real life. Problem - The cost.
4. Touch-Sensitive Screens are abit like concept keyboards - but instead of pressing a key, you touch the picture or word on the screen. Benefits - easy to use. Problem - More expensive than a keyboard and they get dirty from being touched.
5. Microphones are becoming increasingly used as an input device. They are used to input data into voice-recognition systems, which convert sound into text or commands for the computer. Benefit - You can use dictation instead of having to type. Problem - The data uses a lot of energy.
6. Sensors are hardware that record environmental information and convert it to data. Examples include temperate sensors, light sensors and infra-red sensors used in burglar alarm systems.
7. Touch-Tone Telephones have a different tone for each button on the keypad. This sound is transmitted over the phone line and can be used to input commands into the system at the other end of the line. They are used by cinemas to run on-line box offices, by banks to do direct banking etc.
8. Midi Instruments - These instruments can be used to enter music into a computer package, e.g A keyboard can be played and the notes are recorded on the computer, where they can be edited. Benefits - the sound can be changed. Problem - the computer software is expensive.
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