INPUT DEVICES - Voice Recognition System
- Enable hands-free interaction but normally need to be taught to recognize the user’s voice.
- This can take some time so they are not suitable for public kiosk applications.
- Most voice recognition systems can recognize a number of single words commands such as ‘Print’ and ‘Save’
- There are also dictation systems which can transcribe spoken text with a high degree of accuracy and may be alternative to typing of multimedia scripts.
INPUT DEVICES - Digital Cameras
- Digital still cameras provide a direct way of capturing digital images and are becoming increasingly common.
- The memory requirements of a digital camera image will depend on the resolution used, but will commonly be around 2mb
OUTPUT DEVICES - Monitors
- Most multimedia is presented on color monitors that display a matrix of 640 pixels wide and 480 pixels high with 256 colors for each pixel
- This is called VGA (Video Graphics Array) and is sufficient to display good photo-realistic images.
- As the number of colors increases the performance of the computer needs to be boosted to maintain the quality of the image.
INPUT DEVICES - Sound Cards
- Whereas all Macintoshes have internal speakers and a sound card these may need to be added to a PC (although an increasing number of PCs have built in sound cards and internal or external speakers)
OUTPUT DEVICES - Video Devices
- Good video can greatly enhance and application whereas poor video can detract from its other features.
- As well as ensuring that the source material is high of quality, it is important the devices chosen to play it will optimize performance.
- A video digitizing board installed in the computer will enable the monitor to display a television picture.
- Display of video on any computer platform requires the manipulation of an enormous amount of data
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