chapter 8: digital media1 digital media chapter 8

Chapter 8: Digital Media 1

Digital Media

Chapter 8


Digital Sound

• Digital Audio Basics

• Portable Audio Players

• MIDI Music

• Speech Recognition and Synthesis


Digital Audio Basics

• Digital representation of sound



• Sampling rate



• Sound cards


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


MIDI Music

• MIDI (Musical Instrument Digital Interface)

• MIDI-capable sound cards contain a wavetable


MIDI Music

MIDI music tends not to have the full resonance of waveform audio.


MIDI Music

Music composition softwareprovides tools for entering notes, specifying instruments, printing sheet music, and saving compositions in formatssuch as MIDI.


Speech Recognition and Synthesis

• Speech synthesis

• Speech recognition


Speech Recognition and Synthesis


Bitmap Graphics

• Bitmap Basics

• Scanners and Cameras

• Image Resolution

• Color Depth and Palettes

• Image Compression

• Bitmap Graphics Formats


Bitmap Graphics

• Composed of a grid of dots


Scanners and Cameras

• Graphics software is used to modify or edit bitmap graphics

• Can require a lot

of storage space


Image Resolution

• What is image resolution?


Image Resolution

• File size of bitmaps can be reduced by cropping


Image Resolution

• Pixel interpolation


Color Depth and Palettes

• Color depth

• Color palettes


Color Depth and Palettes


Image Compression• What is image compression?

– Lossless compression

– Lossy compression


Image Compression

Popular file compressionutilities, such as WinZip,zip one or more files intoa new compressed filewith a .zip extension.


Bitmap Graphic Formats


Vector and 3-D Graphics

• Vector Graphics Basics

• Vector-to-Bitmap Conversion

• Vector Graphics on the Web

• 3-D Graphics


Vector GraphicsVector graphics use geometrical primitives,

based on mathematical equations, to represent images in computer graphics.


Vector Graphics vs. Bitmaps

• Resizing

• Storage space

• Realism

• Editing


Vector Graphic Basics


Vector-to-Bitmap Conversion

• Rasterization

• Tracing software


Vector Graphics on the Web

• SVG (Scalable Vector Graphics) and Flash are vector graphic formats for the Web

• Advantages of using vector graphics


3-D Graphics

• Stored as a set of instructions

• Rendering

• Ray tracing


3-D Graphics


Digital Video

• Digital Video Basics• Video Output


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


Video Output

– DVD-video– PDA video


Video Output


Digital Rights Management

• DRM Basics• Signal Scrambling and Digital Watermarks• CD Copy Protection• DVD DRM• DRM for Digital Downloads


DRM Basics

• Digital rights management (DRM)

– Things that are sometimes allowed:• Time shifting (like a DVR)• Place shifting• Format shifting


Signal Scrambling and Digital Watermarks

• Signal scrambling

• Digital watermark

• Broadcast flag


CD Copy Protection

• Copy protection


DVD DRM

• Copy generation management


DVD DRM

• Analog protection system

• CSS (Content Scramble System)


DVD DRM

• DVD region code

• AACS (Advanced Access Content System)


DRM for Digital Downloads

• FairPlay


Chapter 8 Complete

Digital Media

chapter 8: digital media1 digital media chapter 8

Documents

digital mediachapter

media player software

waveform audio filesyou

resonance of waveform

image compressionwhat

image resolutionwhat

vector graphicsvector

popular waveform audio