chapter 8: digital media1 digital media chapter 8
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Chapter 8: Digital Media 1
Digital Media
Chapter 8
Chapter 8: Digital Media 2
Digital Sound
• Digital Audio Basics
• Portable Audio Players
• MIDI Music
• Speech Recognition and Synthesis
Chapter 8: Digital Media 3
Digital Audio Basics
• Digital representation of sound
Chapter 8: Digital Media 4
Digital Audio Basics
• Sampling rate
Chapter 8: Digital Media 5
Digital Audio Basics
• Sound cards
Chapter 8: Digital Media 6
Waveform Audio
• The most popular waveform audio formats include AAC, AIFF, MP3, RealAudio, Wave, and WMA
• Audio or media player software allows you to record and play waveform audio files
• You can embed waveform files into a Web page
Chapter 8: Digital Media 7
MIDI Music
• MIDI (Musical Instrument Digital Interface)
• MIDI-capable sound cards contain a wavetable
Chapter 8: Digital Media 8
MIDI Music
MIDI music tends not to have the full resonance of waveform audio.
Chapter 8: Digital Media 9
MIDI Music
Music composition softwareprovides tools for entering notes, specifying instruments, printing sheet music, and saving compositions in formatssuch as MIDI.
Chapter 8: Digital Media 10
Speech Recognition and Synthesis
• Speech synthesis
• Speech recognition
Chapter 8: Digital Media 11
Speech Recognition and Synthesis
Chapter 8: Digital Media 12
Bitmap Graphics
• Bitmap Basics
• Scanners and Cameras
• Image Resolution
• Color Depth and Palettes
• Image Compression
• Bitmap Graphics Formats
Chapter 8: Digital Media 13
Bitmap Graphics
• Composed of a grid of dots
Chapter 8: Digital Media 14
Scanners and Cameras
• Graphics software is used to modify or edit bitmap graphics
• Can require a lot
of storage space
Chapter 8: Digital Media 15
Image Resolution
• What is image resolution?
Chapter 8: Digital Media 16
Image Resolution
• File size of bitmaps can be reduced by cropping
Chapter 8: Digital Media 17
Image Resolution
• Pixel interpolation
Chapter 8: Digital Media 18
Color Depth and Palettes
• Color depth
• Color palettes
Chapter 8: Digital Media 19
Color Depth and Palettes
Chapter 8: Digital Media 20
Image Compression• What is image compression?
– Lossless compression
– Lossy compression
Chapter 8: Digital Media 21
Image Compression
Popular file compressionutilities, such as WinZip,zip one or more files intoa new compressed filewith a .zip extension.
Chapter 8: Digital Media 22
Bitmap Graphic Formats
Chapter 8: Digital Media 23
Vector and 3-D Graphics
• Vector Graphics Basics
• Vector-to-Bitmap Conversion
• Vector Graphics on the Web
• 3-D Graphics
Chapter 8: Digital Media 24
Vector GraphicsVector graphics use geometrical primitives,
based on mathematical equations, to represent images in computer graphics.
Chapter 8: Digital Media 25
Vector Graphics vs. Bitmaps
• Resizing
• Storage space
• Realism
• Editing
Chapter 8: Digital Media 26
Vector Graphic Basics
Chapter 8: Digital Media 27
Vector-to-Bitmap Conversion
• Rasterization
• Tracing software
Chapter 8: Digital Media 28
Vector Graphics on the Web
• SVG (Scalable Vector Graphics) and Flash are vector graphic formats for the Web
• Advantages of using vector graphics
Chapter 8: Digital Media 29
3-D Graphics
• Stored as a set of instructions
• Rendering
• Ray tracing
Chapter 8: Digital Media 30
3-D Graphics
Chapter 8: Digital Media 31
Digital Video
• Digital Video Basics• Video Output
Chapter 8: Digital Media 32
Digital Video Basics
• Uses bits to store color and brightness data for each video frame
• Different kinds of digital videos:– Desktop video– Web-based video
• Desktop, PDA, and Web Video• DVD-Video
Chapter 8: Digital Media 33
Video Output
– DVD-video– PDA video
Chapter 8: Digital Media 34
Video Output
Chapter 8: Digital Media 35
Digital Rights Management
• DRM Basics• Signal Scrambling and Digital Watermarks• CD Copy Protection• DVD DRM• DRM for Digital Downloads
Chapter 8: Digital Media 36
DRM Basics
• Digital rights management (DRM)
– Things that are sometimes allowed:• Time shifting (like a DVR)• Place shifting• Format shifting
Chapter 8: Digital Media 37
Signal Scrambling and Digital Watermarks
• Signal scrambling
• Digital watermark
• Broadcast flag
Chapter 8: Digital Media 38
CD Copy Protection
• Copy protection
Chapter 8: Digital Media 39
DVD DRM
• Copy generation management
Chapter 8: Digital Media 40
DVD DRM
• Analog protection system
• CSS (Content Scramble System)
Chapter 8: Digital Media 41
DVD DRM
• DVD region code
• AACS (Advanced Access Content System)
Chapter 8: Digital Media 42
DRM for Digital Downloads
• FairPlay
Chapter 8: Digital Media 43
Chapter 8 Complete
Digital Media
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