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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