1. IT2032PAContent Management System (CMS) Nitec in Social Media & Web Technology

2. CMS Content UpdatingIn this chapter, you will learn:o Define what is digital audioo Identify the various sound formats and itscharacteristicso Describe the advantages and disadvantages of thevarious formats across platforms.o Define what digital animationo Identify the characteristics and file extensions ofvarious animation formats.o Describe the advantages and disadvantages of thevarious formats across platforms. 3. Digital SoundA sound file format is simply a recognizedmethodology for organizing the digitisedsounds data bits and bytes into a data file.Audio in Macintosho On Macintosh, digitized sound is stored as datafiles (file extension .AIF or .SDIIAudio in Windowso Microsoft has established a common audio fileformat called the wave audio format (wav) 4. Digital SoundWorking with audio in the Interneto Download the entire audio fileo Let the audio file streams into the computer 5. Digital SoundMusical Instrument Digital Interface MIDI Formato It is not a digital audio format but a form of musicnotationo Both Mac and Windows make use of MIDI fileso A MIDI interface is built into many sound cards ofthe PCo MIDI sounds are typically stored in files with the.MID extension 6. Digital SoundAdvantages of MIDI Formato it is a near universal playbacko easy integration into existing HTML pageso MIDI sizes are relatively small (2 KB and 25 KB) 7. Digital SoundDisadvantages of MIDI Formato it uses entirely different method of producingsoundo it is basically a music notation and not a storageformat for digitized audioo it is limited to jingles, instrumental tunes andambient synthesizer background sounds 8. Digital SoundWindows WAVE Format (.wav) o Developed by Microsoft and IBM and is the common audio file format used for Windows. o may be compressed or uncompressed o one of the common formats used to store and play audio data o it doesnt address compression 9. Digital SoundAiff Format (.aiff, .aif)o stands for Audio Interchange File Format andwas developed by Apple for storage of soundso a flexible file formato allows the specification of arbitrary samplingrates, sample size, number of channels, andapplication-specific format chunks. 10. Digital SoundSnd Format (.snd)o The SND (Sound ) was developed by AppleComputer Inc.o SND files are not cross-platformo Not supported by all web browser 11. Digital SoundMP3 Format (.mp3) o Uses a compression ratio capable of bringing file sizes down to approximately a megabyte a minute o uses a lossy compression scheme o MP3 stands for MPEG 1 layer 3 o usually 10-12 times smaller than normal 44Khz 16-bit stereo wav files o MP3 files are the sound part of the MPEG video format 12. Digital SoundRealAudio Fomat (.rm, ram)o developed for the Internet by Real Mediao also supports videoo features true streaming technologyo allows streaming of audio (on-line music, Internetradio) with low bandwidthso reduces significant file size reductions 13. Digital SoundWindows Media Audio Format (.wma) o is a relatively late entry into the field of proprietary audio formats o performs very good at lower bit-rates o produce quality indistinguishable from the original CD at 128 kbps o supported by most full-featured player programs o is royalty-free when incorporated into software that runs on the Windows platform o ASF is Microsofts specification for streaming 14. CompressionMPEG-1 Digital Audio Compressiono Layer I not commonly used and seldomdiscussed.o Layer II used in DVD audio.o Layer III commonly called MP3. It is a popularformat for compressed music on the Internet. 15. CompressionMPEG-2 Digital Audio Compressiono adds multiple channelso provides backward compatibility with MPEG-1decoders 16. CompressionDolby Digital Audio Compressiono also known as AC-3o chosen audio compression for the new digitaltelevision transmissiono allows up to 5.1 channels of discrete digital audioto be compressed 17. Audio on the WebBenefitso communicate ideas through informativedialogue, narration and voice contento improve site navigation with sound effectso enliven the entertainment pageso provide background music to yourpresentationo online music sales and distribution of digitizedaudio clips 18. Streaming MediaThe Streaming Media is a powerful technicalinnovation1. Compress a digital audio file2. Breaking it into small packets3. Sent one after another over the internet.4. When the packets reached their destination5. They are decompressed and re-assembled6. Played by the users system. 19. Streaming Media FormatsThe widely used formats are:o RealNetworks RealAudioo MP3o Adobe Flasho Microsofts Window Mediao Apples QuickTime 20. Digital AnimationAnimation makes static presentation come alive. 21. Streaming Media FormatsAnimation is possible because of a biologicalphenomenon known as persistence of visionand a psychological phenomenon called phi 22. Streaming Media FormatsTweeningo The series of frames in between the keyframesFrame Rateo is the frequency (rate) at which an imaging deviceproduces unique consecutive images calledframes. 23. Animation File FormatFli/Flc FormatFLC - Animator Pro Flic Fileso This is the main animation file format created byAnimator Pro.FLI - Original Animator Flic Fileso limited to 320x200 resolutionso file structure is very similar to that of a FLC file 24. Animation File FormatGIF89o allows multiple images to be put into a single fileand then displayed as an animation in a Webbrowsero Allows for transparency 25. Animation File FormatSWF (Small Web Format or Shockwave Flash)o was designed to deliver vector graphics andanimation over the Interneto designed to meet the following goals: On-screen Display Network Delivery Simplicity File Independence Scalability Speed 26. Animation File FormatMNG o is short for Multiple-image Network Graphics o designed to replace the animated GIF o designed to animate a series of JPG images in as complicated a way as possible 27. Animation for the WebHTML makes no provision for animationAnimation using:o GIF89o Adobe SWFo Java Script