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

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Digital Audio Basics

• Digital representation of sound

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Digital Audio Basics

• Sampling rate

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Digital Audio Basics

• Sound cards

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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

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MIDI Music

• MIDI (Musical Instrument Digital Interface)

• MIDI-capable sound cards contain a wavetable

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MIDI Music

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

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MIDI Music

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

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Speech Recognition and Synthesis

• Speech synthesis

• Speech recognition

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Speech Recognition and Synthesis

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Bitmap Graphics

• Bitmap Basics• Scanners and Cameras• Image Resolution• Color Depth and Palettes• Image Compression• Bitmap Graphics Formats

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Bitmap Graphics

• Composed of a grid of dots

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Scanners and Cameras

• Graphics software is used to modify or edit bitmap graphics

• Can require a lot of storage space

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Image Resolution

• What is image resolution?

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Image Resolution

• File size of bitmaps can be reduced by cropping

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Image Resolution

• Pixel interpolation

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Color Depth and Palettes

• Color depth

• Color palettes

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Color Depth and Palettes

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Image Compression• What is image compression?

– Lossless compression

– Lossy compression

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Image Compression

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

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Bitmap Graphic Formats

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Vector and 3-D Graphics

• Vector Graphics Basics• Vector-to-Bitmap Conversion• Vector Graphics on the Web• 3-D Graphics

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Vector GraphicsVector graphics use geometrical primitives,

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

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Vector Graphics vs. Bitmaps

• Resizing

• Storage space

• Realism

• Editing

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Vector Graphic Basics

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Vector-to-Bitmap Conversion• Rasterization

• Tracing software

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Vector Graphics on the Web

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

• Advantages of using vector graphics

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3-D Graphics

• Stored as a set of instructions

• Rendering

• Ray tracing

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3-D Graphics

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Digital Video

• Digital Video Basics• Video Output

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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

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Video Output

– DVD-video– PDA video

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Video Output

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Digital Rights Management

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

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DRM Basics

• Digital rights management (DRM)

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

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Signal Scrambling and Digital Watermarks

• Signal scrambling

• Digital watermark

• Broadcast flag

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CD Copy Protection

• Copy protection

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DVD DRM

• Copy generation management

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DVD DRM

• Analog protection system

• CSS (Content Scramble System)

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DVD DRM• DVD region code

• AACS (Advanced Access Content System)

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DRM for Digital Downloads

• FairPlay

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Chapter 8 CompleteDigital Media