CS4624 Devices
- Digital media devices
- Capture
- Keyboards: ASCII, MIDI
- Digitizers: Audio, video
- Frame grabber
- Scanner, OCR, eyetracking, infared remote control, joystick, mice, speech recognition, tablets, touchscreens, trackballs, whiteboard
- Presentation
- Framebuffer, display driver
- Printer
- MIDI synthesizer
- Audio D-A converter
- Aroma dispenser, headphone, speech synthesizer, whiteboard
- Monitor:
- higher resolution screens with at least 640x480 video
- SVGA is 640x480, 256 colors, CLUT
- 15 bit SVGA handles 32,768 colors
- 24 bit handles 16,777,216 colors
- fast graphics
- 24 to/from 8 bit color conversion
- dithering (e.g., 24 to 8)
- e.g., Heckbert's median cut algorithm; N.B. If only have 4 bits, it is better to switch to gray scale
- Processing
- Audio/video codec
- Audio/video effects device
- Sound boards
- sampling rates to 44.1 kHz for 16 bit samples
- Sound Blaster is one of the original "standards" (in MPC).
- MIDI is cheaper with an FM synthesizer, that generates sounds algorithmically.
- Wavetable synthesizers cost more, but sound more realistic, and use stored waveforms from actual instruments.
- DSPs are desirable because of their flexibility.
- 48 kHz audio is slightly better, but hard to tell the difference
- 3D graphics hardware
- Storage
- Optical: erasable optical: e.g., 3.5 inch, 128 Mb MO, $40 each
- Magnetic tape: helical scan
- Magnetic disk
- Jukebox: caching, staging for tertiary store; have max. possible no. of drives
- Analog media devices
- Sources
- Microphone
- Video camera, videodisc, video tape player
- Audio tape player
- Photographic camera
- Sinks
- Speakers, audio tape recorders
- Video displays, tape reporters
- Filters
- Audio/video effects device
- Audio/video mixer (switcher)
- Video scan converter, overlay device
- Routing switch, edit controller
- Video synchronization: sync generator, timebase corrector
[ Home | Lecture Notes | Lecture 7 ]
Copyright 1996 Edward A. Fox