Chapter Digital Media Chapter Contents Section A: Digital Sound Section B: Bitmap Graphics Section C: Vector Graphics Section D: Digital Video Section E: Digital Rights Management Chapter 8: Digital Media SECTION Digital Sound A Digital Audio Basics Portable Audio Players MIDI Music Speech Recognition and Synthesis Chapter 8: Digital Media Digital Audio Basics Digital representation of sound Chapter 8: Digital Media Digital Audio Basics Sampling rate refers to number of times per second that a sound is measured Chapter 8: Digital Media Digital Audio Basics Sound cards are responsible for transforming bits stored in an audio file into music, sound effects, and narrations – Digital signal processor Chapter 8: Digital Media 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 Portable Audio Players Pocket-sized, battery-powered device that stores digital music – Ipod, Zune Digital music is available from a wide variety of sources – Formats include MP3, AAC, and WMA Chapter 8: Digital Media 8 MIDI Music MIDI (Musical Instrument Digital Interface) specifies a standard way to store music data for synthesizers, electronic MIDI instruments, and computers MIDI-capable sound cards contain a wavetable – Set of prerecorded musical instrument sounds Does not produce high-quality vocals Does not have full resonance of “real” sound Chapter 8: Digital Media Speech Recognition and Synthesis Speech synthesis is the process by which machines produce sound resembling spoken words – Text-to-speech software Speech recognition refers to the ability of a machine to understand spoken words – Speech recognition software Chapter 8: Digital Media 10 Video Output Chapter 8: Digital Media 39 Desktop, PDA, and Web Video Desktop video is usually displayed on a computer screen Some PDAs and smartphones can be configured to play digital video Web-based videos – Streaming video Chapter 8: Digital Media 40 Desktop, PDA, and Web Video  You can add external or internet videos to a Web page  Internet connection speed affects Web videos  Web video formats include MPEG4, MOV, ASF, and RM Chapter 8: Digital Media 41 DVD-Video Incorporate digital videos onto DVDs with interactive menus – DVD authoring software Chapter 8: Digital Media 42 DVD-Video With advance planning, menus are easy to create Output video in DVD-video format A DVD image is a prototype of your DVD – Stored on your computer’s hard disk Thoroughly test DVD on your computer before you burn it Chapter 8: Digital Media 43 SECTION Digital Rights Management E DRM Basics Signal Scrambling and Digital Watermarks CD Copy Protection DVD DRM DRM for Digital Downloads Chapter 8: Digital Media 44 DRM Basics Digital rights management (DRM) is a collection of techniques used by copyright holders to limit access and use of digital content Chapter 8: Digital Media 45 Signal Scrambling and Digital Watermarks Signal scrambling is a term commonly used for obscuring cable or satellite television images until they are unscrambled by a set-top box or other authorized mechanism A digital watermark is a pattern of bits inserted at various places in an image or a content stream that can be used to track, identify, verify, and control content use – Broadcast flag Chapter 8: Digital Media 46 CD Copy Protection Copy protection refers to technologies designed to prohibit consumers from copying content Chapter 8: Digital Media 47 DVD DRM Copy generation management is a digital watermark that specifies the number of times a content stream can be duplicated Chapter 8: Digital Media 48 DVD DRM An analog protection system is any DRM technology that interjects signals into the video stream to prevent analog output from being copied CSS (Content Scramble System) is a DRM technology designed to encrypt and control the use of content stored on DVDs Chapter 8: Digital Media 49 DVD DRM Chapter 8: Digital Media 50 DVD DRM  A DVD region code specifies geographical area of legitimate use for DVD disks and players  AACS (Advanced Access Content System) is a DRM technology designed to encrypt and protect content on optical disks Chapter 8: Digital Media 51 DRM for Digital Downloads  FairPlay to control music downloaded from the iTunes store Microsoft supplies DRM technologies for several online music stores, including Zune Chapter 8: Digital Media 52 Chapter Complete Digital Media ... size – Reduce the frame rate – Compress data Chapter 8: Digital Media 37 Video Output Chapter 8: Digital Media 38 Video Output Chapter 8: Digital Media 39 Desktop, PDA, and Web Video Desktop... DVD-video – PDA video Chapter 8: Digital Media 32 Digital Video Basics Chapter 8: Digital Media 33 Producing Video Footage Use digital or analog video camera to shoot video footage – Digital video cameras... it Chapter 8: Digital Media 43 SECTION Digital Rights Management E DRM Basics Signal Scrambling and Digital Watermarks CD Copy Protection DVD DRM DRM for Digital Downloads Chapter 8: Digital